Jiuping Zhong | Sun Yat-Sen University (original) (raw)

Papers by Jiuping Zhong

Crystal Growth & Design, 2014

ABSTRACT The phosphors of trivalent rare-earth ion Eu3+-activated alkaline double tungstates NaLu... more ABSTRACT The phosphors of trivalent rare-earth ion Eu3+-activated alkaline double tungstates NaLu(WO4)(2) were prepared by the EDTA-assisted hydrothermal method. The crystal structure and morphology of the as-synthesized phosphors were determined by powder X-ray diffraction (XRD) and electron microscopes (SEM and TEM), respectively. The phase and morphology can be controlled by different Eu3+-doping concentrations. Not less than 40 at % of Eu3+ doping concentration pledged the NaLu(WO4)(2):Eu3+ structure, and the microcrystal changed from hexahedron to tetrahedron with increasing Eu3+ doping concentration. It was found that the final product of NaLu1-xEux(WO4)(2) (x >= 0.4) can not be obtained directly, intermediated by WO3, Na2W2O7, and REO(OH). The photoluminescence and electroluminescence properties were also investigated. Because of an intense red emission and a good excitation in the region of near-ultraviolet (n-UV), the samples NaLu(WO4)(2):Eu3+ can be served as alternative red phosphors in the n-UV chip-based LED application.

Optical Materials, 2015

ABSTRACT In order to develop a new warm-color emission phosphor under vacuum ultraviolet (VUV) ex... more ABSTRACT In order to develop a new warm-color emission phosphor under vacuum ultraviolet (VUV) excitation, trivalent samarium ion (Sm3+) doped GdAl3(BO3)(4) was prepared by a solid state reaction technique at high temperature. The VUV excitation and emission spectra of as-synthesized sample GdAl3(BO3)(4):Sm3+ were determined in the Beijing Synchrotron Radiation Facilities (BSRF). Compared with the emission of GdAl3(BO3)(4):Eu3+ GdAl3(BO3)(4):Sm3+ shows an orange-red emission under Xe 172 nm VUV excitation, which indicates that Sm3+ ion can be a possible activator to obtain warm color emission in the field of lighting. Furthermore, for improving the emission of Sm3+ doped in GdAl3(BO3)(4), the energy transfer process from Gd3+ in the host to the activator Sm3+ was investigated through the analysis of spectroscopic characteristics and luminescence decay curves of GdAl3(BO3)(4):Sm3+. The results reveal that there exists energy transfer from Gd3(+) to Sm3+, but the energy transfer from Sm3+ to Gd3+ is inefficient.

ChemInform, 2012

ABSTRACT Ca3La3(1-x)Ce3x(BO3)5 (x = 0, 0.01, 0.04, 0.10, 0.30, 0.50) phosphors are synthesized by... more ABSTRACT Ca3La3(1-x)Ce3x(BO3)5 (x = 0, 0.01, 0.04, 0.10, 0.30, 0.50) phosphors are synthesized by solid state reaction of CaCO3, H3BO3, CeO2, and La2O3 (CO atmosphere, 1100 °C, 10 h).

Optical Materials, 2011

... The first lasing action at 1030 nm using (incoherent) diodes as the pumping source was report... more ... The first lasing action at 1030 nm using (incoherent) diodes as the pumping source was reported by Reinberg et al. ... Before being weighed to an accuracy of 0.1 mg, the raw materials were first dried at 300 °C for 24 h in muffle furnace to remove water. ...

Optical Materials, 2011

To improve the infrared emission of Yb3+ ions doped in the garnet host Y3Al5O12 (YAG) single crys... more To improve the infrared emission of Yb3+ ions doped in the garnet host Y3Al5O12 (YAG) single crystal through the energy transfer from Ce3+ to Yb3+ ions, the 〈1 1 1〉-oriented YAG:Ce3+, YAG:Yb3+, YAG:(Ce3+, Yb3+) and Yb3Al5O12:Ce3+ (YbAG:Ce3+) single crystals were grown using the Czochralski Method, respectively. The excitation and emission spectra of these garnet single crystals were characterized. In YAG:Ce3+ crystal, the yellow emission of Ce3+ ions present, but it was completely extinguished in YAG:(Ce3+, Yb3+) crystal and YbAG:Ce3+ crystal. However, the characteristic absorption bands of Ce3+ still existed in the excitation spectrum of Yb3+ ions, which showed that the energy absorbed by Ce3+ ions can be transferred to Yb3+ ions for its infrared emission.► Yttrium-aluminate garnet crystals co-doped with Ce3+ and Yb3+ ions were grown. ► The optical properties of (Yb3−xYx)Al5O12:Ce3+ crystals were reported. ► The energy transfer process from Ce3+ to Yb3+ ions in YAG host was investigated.

Optics Express, 2011

Tb 3+ doped Ba 3 Gd(PO 4 ) 3 and Ba 3 La(PO 4 ) 3 phosphors were synthesized using the traditiona... more Tb 3+ doped Ba 3 Gd(PO 4 ) 3 and Ba 3 La(PO 4 ) 3 phosphors were synthesized using the traditional high temperature solid state reaction method. The excitation, emission, and decay spectra were measured at room temperature. Efficient energy transfer (ET) from Gd 3+ to Tb 3+ exists in Tb 3+ doped Ba 3 Gd(PO 4 ) 3, and the ET efficiency increases with the increase of Tb 3+ concentration. The visible quantum cutting (QC) via cross relaxation was observed upon exciting low-spin ( 7 D J ) 5d levels of Tb 3+ ions. Ba 3 Tb(PO 4 ) 3 sample shows relatively strong emission intensity in comparison with Zn 2 SiO 4 : Mn 2+ (ZSM) upon 172 nm excitation, and with a decay time τ 1/10 about 6.4 ms under 351 nm excitation, indicating the potential application of this phosphor for plasma display panels (PDPs) and Hg-free lamps. OCIS codes: (160.2540) Fluorescent and luminescent materials; (250.5230) Photoluminescence; (300.6280) Spectroscopy, fluorescence and luminescence.

Optical Materials Express, 2013

The compounds containing lutetium and tungsten atoms have large effective atomic number (Z eff ) ... more The compounds containing lutetium and tungsten atoms have large effective atomic number (Z eff ) and high stopping ability for high energy radiation because both lutetium and tungsten atoms are heavy with large atomic number. In order to obtain a new red-emitting phosphor with high efficiency for X-ray detection, the trivalent europium ion (Eu 3+ ) activated alkaline double tungstate phosphor NaLu(WO 4 ) 2 :Eu 3+ was prepared by high temperature solid state reaction. The crystalline structures of synthesized phosphor were determined by powder X-ray diffraction (XRD) and elucidated using Topas Academic software, and the morphologies were characterized by thermal field emission scanning electron microscopy (SEM) combined with energy-dispersive X-ray spectroscopy (EDS). The Rietveld structural refinement results suggest that the cell parameters become larger with the increasing of Eu 3+ doping concentration. The emission spectra of NaLu(WO 4 ) 2 :Eu 3+ under UV and Xray radiation were measured, respectively. It was observed that this microparticle phosphor shows intensive red emission under X-ray radiation, which implies that NaLu(WO 4 ) 2 :Eu 3+ phosphor has potential application for X-ray detection.

Chemical Physics Letters, 2007

Cerium-activated polyphosphates NaGd(PO3)4:Ce3+ were prepared by high temperature solid-state rea... more Cerium-activated polyphosphates NaGd(PO3)4:Ce3+ were prepared by high temperature solid-state reaction technique. The emission spectra of NaGd(PO3)4:Ce3+ under UV and X-ray excitation as well as the fluorescence decay curves were determined. The phosphors show broad emission bands in the wavelength range 300–350 nm. The fluorescence decay of Ce3+ upon 297 nm excitation exhibits a single exponential characteristic with a decay constant around 12.4 ns. The light yield of NaGd(PO3)4:10.0 at% Ce3+ excited with X-rays at RT was calculated to be about 21 000 ± 1500 photons/MeV. Due to its suitable emission wavelength range, high light yield, shorter decay time and non-hygroscopic property, NaGd(PO3)4:Ce3+ may be a potential scintillator material.X-ray excited emission spectrum of NaGd(PO3)4:10.0 at% Ce3+ at RT. The dotted line is the X-ray excited emission spectrum of BaF2 as a reference.

Optics Express, 2008

The phosphor NaGd(PO 3 ) 4 :Dy 3+ was synthesized by solid-state reaction technique at high tempe... more The phosphor NaGd(PO 3 ) 4 :Dy 3+ was synthesized by solid-state reaction technique at high temperature. The vacuum ultraviolet (VUV)-UV excitation spectra and visible emission spectra under VUV/UV excitation were investigated. The sample NaGd(PO 3 ) 4 :Dy 3+ showed suitable spectroscopic characteristics such as broad and strong absorption around 172 nm, intensive emission with the chromaticity coordinates (0.33, 0.38) in warm-white light region. Additionally, this efficient white-emitting phosphor is activated by a single Dy 3+ ion and with a lower preparation temperature, which tend to decrease the consumption of rare earth resource and energy. Therefore, the phosphor NGP:Dy 3+ may be considered as a suitable candidate for Hg-free lamps application. → 4 K 15/2 of doped Dy 3+ ions. Broad bands below the wavelength 190 nm in are considered to include the host-related absorption, the f-d transitions of Dy 3+ in the host lattice, and Dy 3+ ← O 2− charge transfer band (CTB) from the following standpoints.

Optics Express, 2008

The phosphor NaGd(PO 3 ) 4 :Dy 3+ was synthesized by solid-state reaction technique at high tempe... more The phosphor NaGd(PO 3 ) 4 :Dy 3+ was synthesized by solid-state reaction technique at high temperature. The vacuum ultraviolet (VUV)-UV excitation spectra and visible emission spectra under VUV/UV excitation were investigated. The sample NaGd(PO 3 ) 4 :Dy 3+ showed suitable spectroscopic characteristics such as broad and strong absorption around 172 nm, intensive emission with the chromaticity coordinates (0.33, 0.38) in warm-white light region. Additionally, this efficient white-emitting phosphor is activated by a single Dy 3+ ion and with a lower preparation temperature, which tend to decrease the consumption of rare earth resource and energy. Therefore, the phosphor NGP:Dy 3+ may be considered as a suitable candidate for Hg-free lamps application. → 4 K 15/2 of doped Dy 3+ ions. Broad bands below the wavelength 190 nm in are considered to include the host-related absorption, the f-d transitions of Dy 3+ in the host lattice, and Dy 3+ ← O 2− charge transfer band (CTB) from the following standpoints.

Optical Materials, 2009

Rare-earth phosphates MGd(PO 3 ) 4 :1.0 mol% Ce 3+ (M = Li, Na, K, Cs) powder samples were prepar... more Rare-earth phosphates MGd(PO 3 ) 4 :1.0 mol% Ce 3+ (M = Li, Na, K, Cs) powder samples were prepared by a solid-state reaction technique at high temperature. The radioluminescence spectra and light-yield characteristic of MGd(PO 3 ) 4 :Ce 3+ under X-ray irradiation were determined. It was found that, from LiGd(PO 3 ) 4 :Ce 3+ to CsGd(PO 3 ) 4 :Ce 3+ , with the increasing of M + radius, the doublet emission energy of Ce 3+ ions decrease gradually but the light-yield increase significantly. Especially, CsGd(PO 3 ) 4 :1.0 mol% Ce 3+ has the highest X-ray excited light-yield of 24,400 photons/MeV with maximal emission peaks at 337 nm and 358 nm at room temperature. Due to its suitable emission wavelength range, high lightyield, high chemical stability and fast luminescence decay of Ce 3+ emission, CsGd(PO 3 ) 4 :Ce 3+ may be a promising scintillation material.

Journal of Physical Chemistry C - J PHYS CHEM C, 2009

ABSTRACT

Journal of Materials Chemistry, 2007

... Jiuping Zhonga, Hongbin Liang*a, Huihong Lina, Bing Hana, Qiang Su*a and Guobin Zhangb. a MOE... more ... Jiuping Zhonga, Hongbin Liang*a, Huihong Lina, Bing Hana, Qiang Su*a and Guobin Zhangb. a MOE Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of ... Under the emission of Ce 3+ ions, there exist sharp peaks at 273, 275 and 278 nm in Fig. ...

Journal of Luminescence, 2014

The microcrystalline Gd 2 O 3 :Eu 3 þ phosphors were synthesized by the hydrothermal method with ... more The microcrystalline Gd 2 O 3 :Eu 3 þ phosphors were synthesized by the hydrothermal method with post annealing treatment. The powder X-ray diffraction (XRD) indicated the phase transformation from cubic to monoclinic occurred at about 1673 K. The morphologies and sizes were characterized by scanning electron microscopy (SEM). It was found that the morphology of Gd 2 O 3 :Eu 3 þ was altered from nanorod to microparticle as the phase changed from cubic to monoclinic. In order to evaluate the effects of sites and phases on luminescence behaviors, the photoluminescence (PL) properties of both phases were investigated. Dominant red emission was observed due to an efficient energy transfer among the sites as well as the strong excitation of O 2 À -Eu 3 þ charge transfer band. It was calculated that the monoclinic structure has a higher degree of distortion. More importantly, the phase transformation resulted in the red shift of the strongest emission peak of Eu 3 þ from 610.5 to 622.5 nm, closer to the optical transmission window for bioimaging.

Inorganic Chemistry, 2012

A series of Ca(3)La(3(1-x))Ce(3x)(BO(3))(5) phosphors were prepared by a high-temperature solid-s... more A series of Ca(3)La(3(1-x))Ce(3x)(BO(3))(5) phosphors were prepared by a high-temperature solid-state reaction technique. Rietveld refinement was performed using the powder X-ray diffraction (XRD) data, which shows occupation of Ce(3+) on both Ca(2+) and La(3+) sites with a preferred location on the La(3+) site over the Ca(2+) site. The prepared samples contain minor second phase LaBO(3) with contents of ~0.64-3.27 wt % from the Rietveld analysis. LaBO(3):1%Ce(3+) was prepared as a single phase material and its excitation and emission bands were determined for identifying the influence of impurity LaBO(3):Ce(3+) luminescence on the spectra of the Ca(3)La(3(1-x))Ce(3x)(BO(3))(5) samples. The luminescence properties of Ca(3)La(3(1-x))Ce(3x)(BO(3))(5) samples under vacuum ultraviolet (VUV) and UV excitation were investigated, which exhibited two-center luminescence of Ce(3+), assigned to the Ce(1)(3+) center in the La(3+) site and Ce(2)(3+) center in the Ca(2+) site, taking into account the spectroscopic properties and the Rietveld refinement results. The influences of the doping concentration and the excitation wavelength on the luminescence of Ce(3+) in Ca(3)La(3(1-x))Ce(3x)(BO(3))(5) are discussed together with the decay characteristics.

Chemical Physics Letters, 2007

Cerium-activated polyphosphates NaGd(PO 3 ) 4 :Ce 3+ were prepared by high temperature solid-stat... more Cerium-activated polyphosphates NaGd(PO 3 ) 4 :Ce 3+ were prepared by high temperature solid-state reaction technique. The emission spectra of NaGd(PO 3 ) 4 :Ce 3+ under UV and X-ray excitation as well as the fluorescence decay curves were determined. The phosphors show broad emission bands in the wavelength range 300-350 nm. The fluorescence decay of Ce 3+ upon 297 nm excitation exhibits a single exponential characteristic with a decay constant around 12.4 ns. The light yield of NaGd(PO 3 ) 4 :10.0 at% Ce 3+ excited with X-rays at RT was calculated to be about 21 000 ± 1500 photons/MeV. Due to its suitable emission wavelength range, high light yield, shorter decay time and non-hygroscopic property, NaGd(PO 3 ) 4 :Ce 3+ may be a potential scintillator material.

Chemical Physics Letters, 2008

To obtain a suitable green phosphor for plasma display panels (PDPs), the samples of trivalent te... more To obtain a suitable green phosphor for plasma display panels (PDPs), the samples of trivalent terbium-activated polyphosphate NaGd(PO3)4:Tb3+ (NGP:Tb3+) were prepared by a solid-state reaction technique at high temperature. The vacuum ultraviolet (VUV)–visible spectroscopic properties and luminescence decay characteristic were investigated. Because the phosphor NaGd1−xTbx(PO3)4 for x=0.80 shows broad and strong absorption in VUV region, exhibits intensive emission under 147/172nm

Energy transfer has been generally utilized for the sensitization of luminescence in phosphors. I... more Energy transfer has been generally utilized for the sensitization of luminescence in phosphors. It is common that excitation of donor can be transferred efficiently to acceptor. However, energy transfer should be investigated in association with the transfer efficiency from donors to activators. To accomplish this, energy transfer from Gd 3+ to Eu 3+ and Tb 3+ was investigated. It was found that the transfer efficiency from Gd 3+ to Eu 3+ is higher than that from Gd 3+ to Tb 3+ because there are less energy mismatches between the emission of Gd 3+ and the absorption of Eu 3+ than that between Gd 3+ and Tb 3+ in the host NaGd(PO 3 ) 4 .

Crystal Growth & Design, 2014

ABSTRACT The phosphors of trivalent rare-earth ion Eu3+-activated alkaline double tungstates NaLu... more ABSTRACT The phosphors of trivalent rare-earth ion Eu3+-activated alkaline double tungstates NaLu(WO4)(2) were prepared by the EDTA-assisted hydrothermal method. The crystal structure and morphology of the as-synthesized phosphors were determined by powder X-ray diffraction (XRD) and electron microscopes (SEM and TEM), respectively. The phase and morphology can be controlled by different Eu3+-doping concentrations. Not less than 40 at % of Eu3+ doping concentration pledged the NaLu(WO4)(2):Eu3+ structure, and the microcrystal changed from hexahedron to tetrahedron with increasing Eu3+ doping concentration. It was found that the final product of NaLu1-xEux(WO4)(2) (x >= 0.4) can not be obtained directly, intermediated by WO3, Na2W2O7, and REO(OH). The photoluminescence and electroluminescence properties were also investigated. Because of an intense red emission and a good excitation in the region of near-ultraviolet (n-UV), the samples NaLu(WO4)(2):Eu3+ can be served as alternative red phosphors in the n-UV chip-based LED application.

Optical Materials, 2015

ABSTRACT In order to develop a new warm-color emission phosphor under vacuum ultraviolet (VUV) ex... more ABSTRACT In order to develop a new warm-color emission phosphor under vacuum ultraviolet (VUV) excitation, trivalent samarium ion (Sm3+) doped GdAl3(BO3)(4) was prepared by a solid state reaction technique at high temperature. The VUV excitation and emission spectra of as-synthesized sample GdAl3(BO3)(4):Sm3+ were determined in the Beijing Synchrotron Radiation Facilities (BSRF). Compared with the emission of GdAl3(BO3)(4):Eu3+ GdAl3(BO3)(4):Sm3+ shows an orange-red emission under Xe 172 nm VUV excitation, which indicates that Sm3+ ion can be a possible activator to obtain warm color emission in the field of lighting. Furthermore, for improving the emission of Sm3+ doped in GdAl3(BO3)(4), the energy transfer process from Gd3+ in the host to the activator Sm3+ was investigated through the analysis of spectroscopic characteristics and luminescence decay curves of GdAl3(BO3)(4):Sm3+. The results reveal that there exists energy transfer from Gd3(+) to Sm3+, but the energy transfer from Sm3+ to Gd3+ is inefficient.

ChemInform, 2012

ABSTRACT Ca3La3(1-x)Ce3x(BO3)5 (x = 0, 0.01, 0.04, 0.10, 0.30, 0.50) phosphors are synthesized by... more ABSTRACT Ca3La3(1-x)Ce3x(BO3)5 (x = 0, 0.01, 0.04, 0.10, 0.30, 0.50) phosphors are synthesized by solid state reaction of CaCO3, H3BO3, CeO2, and La2O3 (CO atmosphere, 1100 °C, 10 h).

Optical Materials, 2011

... The first lasing action at 1030 nm using (incoherent) diodes as the pumping source was report... more ... The first lasing action at 1030 nm using (incoherent) diodes as the pumping source was reported by Reinberg et al. ... Before being weighed to an accuracy of 0.1 mg, the raw materials were first dried at 300 °C for 24 h in muffle furnace to remove water. ...

Optical Materials, 2011

To improve the infrared emission of Yb3+ ions doped in the garnet host Y3Al5O12 (YAG) single crys... more To improve the infrared emission of Yb3+ ions doped in the garnet host Y3Al5O12 (YAG) single crystal through the energy transfer from Ce3+ to Yb3+ ions, the 〈1 1 1〉-oriented YAG:Ce3+, YAG:Yb3+, YAG:(Ce3+, Yb3+) and Yb3Al5O12:Ce3+ (YbAG:Ce3+) single crystals were grown using the Czochralski Method, respectively. The excitation and emission spectra of these garnet single crystals were characterized. In YAG:Ce3+ crystal, the yellow emission of Ce3+ ions present, but it was completely extinguished in YAG:(Ce3+, Yb3+) crystal and YbAG:Ce3+ crystal. However, the characteristic absorption bands of Ce3+ still existed in the excitation spectrum of Yb3+ ions, which showed that the energy absorbed by Ce3+ ions can be transferred to Yb3+ ions for its infrared emission.► Yttrium-aluminate garnet crystals co-doped with Ce3+ and Yb3+ ions were grown. ► The optical properties of (Yb3−xYx)Al5O12:Ce3+ crystals were reported. ► The energy transfer process from Ce3+ to Yb3+ ions in YAG host was investigated.

Optics Express, 2011

Tb 3+ doped Ba 3 Gd(PO 4 ) 3 and Ba 3 La(PO 4 ) 3 phosphors were synthesized using the traditiona... more Tb 3+ doped Ba 3 Gd(PO 4 ) 3 and Ba 3 La(PO 4 ) 3 phosphors were synthesized using the traditional high temperature solid state reaction method. The excitation, emission, and decay spectra were measured at room temperature. Efficient energy transfer (ET) from Gd 3+ to Tb 3+ exists in Tb 3+ doped Ba 3 Gd(PO 4 ) 3, and the ET efficiency increases with the increase of Tb 3+ concentration. The visible quantum cutting (QC) via cross relaxation was observed upon exciting low-spin ( 7 D J ) 5d levels of Tb 3+ ions. Ba 3 Tb(PO 4 ) 3 sample shows relatively strong emission intensity in comparison with Zn 2 SiO 4 : Mn 2+ (ZSM) upon 172 nm excitation, and with a decay time τ 1/10 about 6.4 ms under 351 nm excitation, indicating the potential application of this phosphor for plasma display panels (PDPs) and Hg-free lamps. OCIS codes: (160.2540) Fluorescent and luminescent materials; (250.5230) Photoluminescence; (300.6280) Spectroscopy, fluorescence and luminescence.

Optical Materials Express, 2013

The compounds containing lutetium and tungsten atoms have large effective atomic number (Z eff ) ... more The compounds containing lutetium and tungsten atoms have large effective atomic number (Z eff ) and high stopping ability for high energy radiation because both lutetium and tungsten atoms are heavy with large atomic number. In order to obtain a new red-emitting phosphor with high efficiency for X-ray detection, the trivalent europium ion (Eu 3+ ) activated alkaline double tungstate phosphor NaLu(WO 4 ) 2 :Eu 3+ was prepared by high temperature solid state reaction. The crystalline structures of synthesized phosphor were determined by powder X-ray diffraction (XRD) and elucidated using Topas Academic software, and the morphologies were characterized by thermal field emission scanning electron microscopy (SEM) combined with energy-dispersive X-ray spectroscopy (EDS). The Rietveld structural refinement results suggest that the cell parameters become larger with the increasing of Eu 3+ doping concentration. The emission spectra of NaLu(WO 4 ) 2 :Eu 3+ under UV and Xray radiation were measured, respectively. It was observed that this microparticle phosphor shows intensive red emission under X-ray radiation, which implies that NaLu(WO 4 ) 2 :Eu 3+ phosphor has potential application for X-ray detection.

Chemical Physics Letters, 2007

Cerium-activated polyphosphates NaGd(PO3)4:Ce3+ were prepared by high temperature solid-state rea... more Cerium-activated polyphosphates NaGd(PO3)4:Ce3+ were prepared by high temperature solid-state reaction technique. The emission spectra of NaGd(PO3)4:Ce3+ under UV and X-ray excitation as well as the fluorescence decay curves were determined. The phosphors show broad emission bands in the wavelength range 300–350 nm. The fluorescence decay of Ce3+ upon 297 nm excitation exhibits a single exponential characteristic with a decay constant around 12.4 ns. The light yield of NaGd(PO3)4:10.0 at% Ce3+ excited with X-rays at RT was calculated to be about 21 000 ± 1500 photons/MeV. Due to its suitable emission wavelength range, high light yield, shorter decay time and non-hygroscopic property, NaGd(PO3)4:Ce3+ may be a potential scintillator material.X-ray excited emission spectrum of NaGd(PO3)4:10.0 at% Ce3+ at RT. The dotted line is the X-ray excited emission spectrum of BaF2 as a reference.

Optics Express, 2008

The phosphor NaGd(PO 3 ) 4 :Dy 3+ was synthesized by solid-state reaction technique at high tempe... more The phosphor NaGd(PO 3 ) 4 :Dy 3+ was synthesized by solid-state reaction technique at high temperature. The vacuum ultraviolet (VUV)-UV excitation spectra and visible emission spectra under VUV/UV excitation were investigated. The sample NaGd(PO 3 ) 4 :Dy 3+ showed suitable spectroscopic characteristics such as broad and strong absorption around 172 nm, intensive emission with the chromaticity coordinates (0.33, 0.38) in warm-white light region. Additionally, this efficient white-emitting phosphor is activated by a single Dy 3+ ion and with a lower preparation temperature, which tend to decrease the consumption of rare earth resource and energy. Therefore, the phosphor NGP:Dy 3+ may be considered as a suitable candidate for Hg-free lamps application. → 4 K 15/2 of doped Dy 3+ ions. Broad bands below the wavelength 190 nm in are considered to include the host-related absorption, the f-d transitions of Dy 3+ in the host lattice, and Dy 3+ ← O 2− charge transfer band (CTB) from the following standpoints.

Optics Express, 2008

The phosphor NaGd(PO 3 ) 4 :Dy 3+ was synthesized by solid-state reaction technique at high tempe... more The phosphor NaGd(PO 3 ) 4 :Dy 3+ was synthesized by solid-state reaction technique at high temperature. The vacuum ultraviolet (VUV)-UV excitation spectra and visible emission spectra under VUV/UV excitation were investigated. The sample NaGd(PO 3 ) 4 :Dy 3+ showed suitable spectroscopic characteristics such as broad and strong absorption around 172 nm, intensive emission with the chromaticity coordinates (0.33, 0.38) in warm-white light region. Additionally, this efficient white-emitting phosphor is activated by a single Dy 3+ ion and with a lower preparation temperature, which tend to decrease the consumption of rare earth resource and energy. Therefore, the phosphor NGP:Dy 3+ may be considered as a suitable candidate for Hg-free lamps application. → 4 K 15/2 of doped Dy 3+ ions. Broad bands below the wavelength 190 nm in are considered to include the host-related absorption, the f-d transitions of Dy 3+ in the host lattice, and Dy 3+ ← O 2− charge transfer band (CTB) from the following standpoints.

Optical Materials, 2009

Rare-earth phosphates MGd(PO 3 ) 4 :1.0 mol% Ce 3+ (M = Li, Na, K, Cs) powder samples were prepar... more Rare-earth phosphates MGd(PO 3 ) 4 :1.0 mol% Ce 3+ (M = Li, Na, K, Cs) powder samples were prepared by a solid-state reaction technique at high temperature. The radioluminescence spectra and light-yield characteristic of MGd(PO 3 ) 4 :Ce 3+ under X-ray irradiation were determined. It was found that, from LiGd(PO 3 ) 4 :Ce 3+ to CsGd(PO 3 ) 4 :Ce 3+ , with the increasing of M + radius, the doublet emission energy of Ce 3+ ions decrease gradually but the light-yield increase significantly. Especially, CsGd(PO 3 ) 4 :1.0 mol% Ce 3+ has the highest X-ray excited light-yield of 24,400 photons/MeV with maximal emission peaks at 337 nm and 358 nm at room temperature. Due to its suitable emission wavelength range, high lightyield, high chemical stability and fast luminescence decay of Ce 3+ emission, CsGd(PO 3 ) 4 :Ce 3+ may be a promising scintillation material.

Journal of Physical Chemistry C - J PHYS CHEM C, 2009

ABSTRACT

Journal of Materials Chemistry, 2007

... Jiuping Zhonga, Hongbin Liang*a, Huihong Lina, Bing Hana, Qiang Su*a and Guobin Zhangb. a MOE... more ... Jiuping Zhonga, Hongbin Liang*a, Huihong Lina, Bing Hana, Qiang Su*a and Guobin Zhangb. a MOE Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of ... Under the emission of Ce 3+ ions, there exist sharp peaks at 273, 275 and 278 nm in Fig. ...

Journal of Luminescence, 2014

The microcrystalline Gd 2 O 3 :Eu 3 þ phosphors were synthesized by the hydrothermal method with ... more The microcrystalline Gd 2 O 3 :Eu 3 þ phosphors were synthesized by the hydrothermal method with post annealing treatment. The powder X-ray diffraction (XRD) indicated the phase transformation from cubic to monoclinic occurred at about 1673 K. The morphologies and sizes were characterized by scanning electron microscopy (SEM). It was found that the morphology of Gd 2 O 3 :Eu 3 þ was altered from nanorod to microparticle as the phase changed from cubic to monoclinic. In order to evaluate the effects of sites and phases on luminescence behaviors, the photoluminescence (PL) properties of both phases were investigated. Dominant red emission was observed due to an efficient energy transfer among the sites as well as the strong excitation of O 2 À -Eu 3 þ charge transfer band. It was calculated that the monoclinic structure has a higher degree of distortion. More importantly, the phase transformation resulted in the red shift of the strongest emission peak of Eu 3 þ from 610.5 to 622.5 nm, closer to the optical transmission window for bioimaging.

Inorganic Chemistry, 2012

A series of Ca(3)La(3(1-x))Ce(3x)(BO(3))(5) phosphors were prepared by a high-temperature solid-s... more A series of Ca(3)La(3(1-x))Ce(3x)(BO(3))(5) phosphors were prepared by a high-temperature solid-state reaction technique. Rietveld refinement was performed using the powder X-ray diffraction (XRD) data, which shows occupation of Ce(3+) on both Ca(2+) and La(3+) sites with a preferred location on the La(3+) site over the Ca(2+) site. The prepared samples contain minor second phase LaBO(3) with contents of ~0.64-3.27 wt % from the Rietveld analysis. LaBO(3):1%Ce(3+) was prepared as a single phase material and its excitation and emission bands were determined for identifying the influence of impurity LaBO(3):Ce(3+) luminescence on the spectra of the Ca(3)La(3(1-x))Ce(3x)(BO(3))(5) samples. The luminescence properties of Ca(3)La(3(1-x))Ce(3x)(BO(3))(5) samples under vacuum ultraviolet (VUV) and UV excitation were investigated, which exhibited two-center luminescence of Ce(3+), assigned to the Ce(1)(3+) center in the La(3+) site and Ce(2)(3+) center in the Ca(2+) site, taking into account the spectroscopic properties and the Rietveld refinement results. The influences of the doping concentration and the excitation wavelength on the luminescence of Ce(3+) in Ca(3)La(3(1-x))Ce(3x)(BO(3))(5) are discussed together with the decay characteristics.

Chemical Physics Letters, 2007

Cerium-activated polyphosphates NaGd(PO 3 ) 4 :Ce 3+ were prepared by high temperature solid-stat... more Cerium-activated polyphosphates NaGd(PO 3 ) 4 :Ce 3+ were prepared by high temperature solid-state reaction technique. The emission spectra of NaGd(PO 3 ) 4 :Ce 3+ under UV and X-ray excitation as well as the fluorescence decay curves were determined. The phosphors show broad emission bands in the wavelength range 300-350 nm. The fluorescence decay of Ce 3+ upon 297 nm excitation exhibits a single exponential characteristic with a decay constant around 12.4 ns. The light yield of NaGd(PO 3 ) 4 :10.0 at% Ce 3+ excited with X-rays at RT was calculated to be about 21 000 ± 1500 photons/MeV. Due to its suitable emission wavelength range, high light yield, shorter decay time and non-hygroscopic property, NaGd(PO 3 ) 4 :Ce 3+ may be a potential scintillator material.

Chemical Physics Letters, 2008

To obtain a suitable green phosphor for plasma display panels (PDPs), the samples of trivalent te... more To obtain a suitable green phosphor for plasma display panels (PDPs), the samples of trivalent terbium-activated polyphosphate NaGd(PO3)4:Tb3+ (NGP:Tb3+) were prepared by a solid-state reaction technique at high temperature. The vacuum ultraviolet (VUV)–visible spectroscopic properties and luminescence decay characteristic were investigated. Because the phosphor NaGd1−xTbx(PO3)4 for x=0.80 shows broad and strong absorption in VUV region, exhibits intensive emission under 147/172nm

Energy transfer has been generally utilized for the sensitization of luminescence in phosphors. I... more Energy transfer has been generally utilized for the sensitization of luminescence in phosphors. It is common that excitation of donor can be transferred efficiently to acceptor. However, energy transfer should be investigated in association with the transfer efficiency from donors to activators. To accomplish this, energy transfer from Gd 3+ to Eu 3+ and Tb 3+ was investigated. It was found that the transfer efficiency from Gd 3+ to Eu 3+ is higher than that from Gd 3+ to Tb 3+ because there are less energy mismatches between the emission of Gd 3+ and the absorption of Eu 3+ than that between Gd 3+ and Tb 3+ in the host NaGd(PO 3 ) 4 .