Synthesis and optical spectroscopy of Na3Y(VO4)2:Eu3+ phosphors for thermometry and display applications (original) (raw)
Related papers
Effect of calcination on the optical properties of YVO4: Eu3+ Nano-phosphors
YVO 4 :Eu3+ nano- phosphors were synthesized by the sol-gel technique and thier size were controlled through calcination. Structural analysis is done by X-ray diffraction (XRD). The optical study is done by photoluminescence (PL) and UV- visible spectroscopy. The PL study shows that the luminescence properties of nano- phosphors are improving with the rise of the calcined temperatur. Luminescence peak at about 618nm corresponds to 5D 0 -7F 2 electric dipole transitions and a weak band at 594nm is due to 5D 0 -7F 1 is magnetic dipole transitions in Eu3+ ions. The broad band in the range between 250 and 350nm is due to the charge transfer transitions from ligand to Eu3+ ion in the UV-visible spectroscopy. This study concludes that with the increase in the calcined temperature of the synthesized phosphors, lumineous intensity increases. The strong emission at the prolonged temperatures make it a potential candidate for the display applications.
Eu3+ doped YNbO4 phosphor properties for fluorescence thermometry
Radiation Measurements, 2013
h i g h l i g h t s < Efficient YNbO 4 :1at%Eu 3þ phosphor was synthesized by a simple solid-state reaction. < Photoluminescence emission spectra were studied in the temperature range 303e803 K. < Intensity ratio of 5 D 1 / 7 F 1 and 5 D 0 / 7 F 1 Eu 3þ ion transitions may be used for temperature measurements. < The temperature sensitivity is about 3.5 Â 10 À3 K À1 in the region around 700 K.
Journal of Fluorescence, 2015
Nano phosphors have been prepared with 1 mol % and 5 mol % doping of Eu in vanadate by sol-gel method. Xray pattern indicated that nano phosphors did not lead to phase change and has tetragonal crystal structure. Excitation spectra revealed that the band at 308 nm arises due to the charge transfer transitions among Eu 3+ and VO 4 3ions. The peak position of fluorescence shifted from 518 to 638 nm on varying the excitation wavelength from 257 nm to 318 nm. It is also noticed that the fluorescence intensity increases with the rise of calcination temperatures of the samples.
Synthesis and optical properties of GdVO4: Eu3+ phosphor
Materials Research Express
In the present work, we have synthesized GdVO 4 doped Eu 3+ using a facile sol-gel method and analysed the effect of concentration variation and annealing temperature on the optical properties. Tetragonal (I4 1 /amd) zircon type crystal structure of the material was confirmed by x-ray diffraction (XRD) study. The photoluminescence (PL) spectra were recorded with an ultraviolet (UV) excitation of wavelength 325 nm. GdVO 4 doped Eu 3+ (1 mol%) gives prominent red emission. This optimized sample was annealed at different temperature and as annealing temperature raises, the crystallinity of the material increases resulting in the improved emission intensity. The emission spectra of this phosphor exhibit intense peaks at wavelengths 593 nm (orange) and 618 nm (red) which corresponds to 5 D 0-7 F 1 , 5 D 0-7 F 2 transitions of Eu 3+ ions. 5 D 0-7 F 2 , the electric dipole transition is dominant indicating that Eu 3+ ions situated at a non-centrosymmetric site in the crystal structure. GdVO 4 : Eu 3+ (1 mol%) annealed at 800°C gives eminent red emission which can be further used as the potential candidate for bioimaging, lighting, temperature sensing and display devices.
Research on Chemical Intermediates, 2014
The present paper reports the synthesis, photoluminescence (PL), and thermoluminescence (TL) studies of Eu 3?-doped yttrium oxide (Y 2 O 3) phosphor using inorganic materials like Y 2 O 3 , flux calcium fluoride, and europium oxide. The sample was prepared by the modified solid state reaction method, which is the most suitable for large-scale production. The prepared phosphor sample was characterized using powder X-ray diffraction, field emission gun scanning electron microscopy, high resolution transmission electron microscopy, Fourier transform infrared spectroscopy , PL, TL, and Commission Internationale de I'Eclairage techniques. The PL emission was observed in the range 417-632 nm ranges all visible regions for the Y 2 O 3 phosphor doped with Eu 3?. Excitation spectrum found at 254 nm. Sharp intense peaks found around 467, 534, 594, 612, and 632 nm with high intensity. From the XRD data, using the Scherer's formula, the calculated average crystallite size of Eu 3?doped Y 2 O 3 phosphor is around 45 nm. TL study was carried out for the phosphor with UV irradiation. The present phosphor can act as single host for white light emission in display devices.
Synthesis and Thermoluminescence Study of Y 2 Zr 2 O 7 : Eu 3 + Phosphor
2015
This paper reports the Thermoluminescence properties of Eu doped yttrium zirconate phosphor. The phosphor is synthesized by solid state reaction method. This method is suitable for large scale production. Starting materials used for sample preparation are Y2O3, ZrO2, Eu2O3 and fixed concentration of boric acid using as a flux. The prepared phosphors for different concentration of Eu 3+ were examined by Thermoluminescence (TL) glow curve for fix UV irradiation. For UV irradiation UV 254 nm source was used. The kinetic parameters such as activation energy, order of kinetics and frequency factor were calculated by peak shape method. Most of the peak shows general order kinetics. The effect of UV exposure on TL studies was examined and it shows linear response with dose that indicates the sample may be useful for TL dosimeter. Keywords— Solid state reaction; Thermoluminescence; yttrium zirconate.
2020
Novel green-emitting erbium(III) (Er 3+)-activated Na(Ca, Sr)La(VO 4) 2 phosphors with an interesting and stable trigonal structure were prepared. The crystal structure, elemental composition, morphology, photoluminescence, and sensing properties were investigated in detail. The color purity values of optimal NaSrLa(VO 4) 2 :0.05Er 3+ and NaCaLa(VO 4) 2 :0.05Er 3+ phosphors were calculated to be about 92.91% and 90.73% with the Commission Internationale de I'Eclairage color coordinates of (0.283, 0.684) and (0.295, 0.676), respectively. Meanwhile, the sensing property and cycling performance of those samples were also studied based on the thermalcouple levels of 4 S 3/2 and 2 H 11/2. The maximum absolute sensing sensitivity values of the NaCaLa(VO 4) 2 :Er 3+ and NaSrLa(VO 4) 2 :Er 3+ phosphors were found to be 9.23 × 10 −3 and 7.69 × 10 −3 K −1 while the relative sensing sensitivity values were found to be 1.15% and 1.20% K −1 , respectively. Furthermore, several repeated tests confirmed that the cycling performance was stable, demonstrating that the resultant samples with high and stable sensing sensitivity are great potential for optical thermometers.
Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, 2005
Low voltage cathodoluminescence ͑LVCL͒ and photoluminescence measurement were carried out to better understand the role of Gd in ͑Y,Gd͒VO 4 : Eu phosphor and to compare two different synthesis methods ͑solid-state reaction, coprecipitation reaction͒ and their preparing conditions. From the analysis of LVCL measurement, it is understood that the luminescence of YVO 4 : Eu and ͑Y,Gd͒VO 4 : Eu phosphors might be interpreted as originating from a two-level system and for reasons of enhanced luminescence intensity of ͑Y,Gd͒VO 4 : Eu phosphor, the effect of Gd on the symmetry of Eu sites dominates over that of interaction between Gd and Eu. It is also found that nano-size phosphor of YVO 4 : Eu synthesized by coprecipitation reaction shows lower quantum yield in comparison with that synthesized by solid-state reaction due to the presence of secondary phase produced after heat treatment.
Physica Scripta, 2013
Phosphors are thermographic if their emission characteristics change with temperature. In this paper, we investigated the potential use of a europium-doped (1, 3 and 6 at.% Eu 3+ ) yttrium-gadolinium oxide (Y 0.75 Gd 0.25 ) 2 O 3 nanostructured matrix for phosphor thermometry and thermometry in high-energy radiation fields. Photoluminescence emission measurements were recorded in the temperature range from room temperature to 873 K, observing temperature changes in trivalent europium ion transitions from 5 D 1 and 5 D 0 energy levels. The results show that Eu 3+ -doped (Y 0.75 Gd 0.25 ) 2 O 3 is a new promising high-temperature thermometric phosphor with a very good sensitivity of approximately 4.9 × 10 −3 K −1 at 823 K for a sample doped with 1 at.% Eu 3+ . It is shown that with this material the fluorescence intensity ratio method can be used for temperature measurements in high-energy radiation fields without the use of an optical excitation source. In this case a maximal sensitivity of 2.35 × 10 −3 K −1 is obtained. PACS number: 78.55.Hx (Some figures may appear in color only in the online journal) 1
Technical Digest of the 17th International Vacuum Nanoelectronics Conference (IEEE Cat. No.04TH8737), 2004
Low voltage cathodoluminescence ͑LVCL͒ and photoluminescence measurement were carried out to better understand the role of Gd in ͑Y,Gd͒VO 4 : Eu phosphor and to compare two different synthesis methods ͑solid-state reaction, coprecipitation reaction͒ and their preparing conditions. From the analysis of LVCL measurement, it is understood that the luminescence of YVO 4 : Eu and ͑Y,Gd͒VO 4 : Eu phosphors might be interpreted as originating from a two-level system and for reasons of enhanced luminescence intensity of ͑Y,Gd͒VO 4 : Eu phosphor, the effect of Gd on the symmetry of Eu sites dominates over that of interaction between Gd and Eu. It is also found that nano-size phosphor of YVO 4 : Eu synthesized by coprecipitation reaction shows lower quantum yield in comparison with that synthesized by solid-state reaction due to the presence of secondary phase produced after heat treatment.