UV light-induced thermoluminescence of Er+ Li doped ZrO2 (original) (raw)

Monoclinic ZrO2 as a broad spectral response thermoluminescence UV dosemeter

Radiation Measurements, 2003

The thermoluminescence characterization of polycrystalline monoclinic ZrO2 samples prepared by the sol-gel process subjected to ultraviolet irradiation was performed. The results show that sol-gel synthesized ZrO2 possesses good thermoluminescence e ciency as well as linear dose response. The thermoluminescence excitation spectrum covers the complete UVA, UVB and UVC range indicating a major advantage over other ultraviolet detector and dosemeters currently used.

High temperature thermoluminescence induced on UV-irradiated tetragonal ZrO2 prepared by sol–gel

Materials Letters, 2000

An unpublished high temperature thermoluminiscent signal centered at 4008C induced by UV radiation of pure tetragonal zirconium oxide, is reported. Zirconia samples were prepared by the sol-gel method and annealed at 5008C to produce the Ž. tetragonal phase and at 10008C to obtain the monoclinic phase. Experimental results show that the thermoluminiscent TL glow peak depends on both the crystalline structure and crystallite size. The high temperature peak is 2708C shifted up with respect to the main peak of the monoclinic phase. To our knowledge, this is the highest temperature TL signal reported for zirconia samples, opening new possibilities for the design of high temperature dosimeters.

Influence of titanium and lutetium on the persistent luminescence of ZrO_2

Optical Materials Express, 2012

Non-doped as well as titanium and lutetium doped zirconia (ZrO 2) materials were synthesized via the sol-gel method and structurally characterized with X-ray powder diffraction. The addition of Ti in the zirconia lattice does not change the crystalline structure whilst the Lu doping introduces a small fraction of the tetragonal phase. The UV excitation results in a bright white-blue luminescence at ca. 500 nm for all the materials which emission could be assigned to the Ti 3+ e g  t 2g transition. The persistent luminescence originates from the same Ti 3+ center. The thermoluminescence data shows a well-defined though rather similar defect structures for all the zirconia materials. The kinetics of persistent luminescence was probed with the isothermal decay curve analyses which indicated significant retrapping. The short duration of persistent luminescence was attributed to the quasi-continuum distribution of the traps and to the possibility of shallow traps even below the room temperature.

Up/Down-Conversion Luminescence of Er3+ Doped ZrO2·Al2O3 Powder

Journal of Electronic Materials, 2019

ZrO 2 AEAl 2 O 3 :Er powder was synthesized by the conventional solid-state reaction method. All the synthesized materials were monoclinic structure of ZrO 2 (m-ZrO 2) and Al 2 O 3 phases. Scanning electron microscope images showed the spherical particles with diameter of $ (30-200) nm. The down-conversion luminescence spectra excited by 380 nm shows near infrared emission band is centered at 1540 nm, corresponding to the transitions of 4 I 13/2-4 I 15/2 of Er 3+ ions. Under the excitation of a 976 nm laser diode, the up-conversion luminescence spectra of the samples show a red emission band at $ 680 nm and a green emission band at $ 565 nm, corresponding to the transitions of 4 F 9/2-4 I 15/2 , 4 S 3/2-4 I 15/2 , of Er 3+ ions, respectively. The dependence of up and down-conversion luminescence properties on dopant concentrations, annealing temperature and Al 2 O 3 concentrations are investigated. These results suggested that this phosphor is a very promising material for light emission and bioimaging.

Visible light emission under UV and IR excitation of rare earth doped ZrO2 nanophosphor

Optical Materials, 2005

Strong visible emission under UV (320 nm) and IR (967 nm) excitation on ZrO 2 :Sm 3+ and ZrO 2 :Er 3+ nanophosphors were obtained and the concentration effect on the luminescence and crystalline structure is reported. Experimental results shows that phase composition depend on the ion concentration. The visible emission obtained under UV excitation is produced by the transitions 4 G 5/2 ! 6 H 5/2,7/2,9/2 of Sm 3+ through a non-radiative energy transfer process from the host to the active ion. Energy transfer and quenching effect due to ion concentration was confirmed by measuring the fluorescence decay time. Green (545 nm) and red (680 nm) emissions bands were observed under IR excitation troughs an upconversion process. It was proved that visible emission for both nanophosphor could be tuned by controlling the ion concentration. The nature of this behavior is discussed taking into account the phase composition for ZrO 2 :Sm 3+ and two photon absorption and cross-relaxation process was considered for ZrO 2 :Er 3+ nanophosphor.