Traps and emission centres in thermoluminescent ZrO2

Abstract

The thermoluminescence (TL) of heated amorphous ZrO2, doped by Ti, Th, U, Nb, Dy, excited by 253.7 nm or X‐radiation is investigated. Six main peaks are observed at 100, 135, 190, 245, 285, and 385 K and their activation energies determined by four methods. It is shown that most traps obey Curie's model, and that the tetragonal form, which coexists with the monoclinic form, is related to the 245 K peak. The analysis of various TL emission spectra indicates that the emission centres are localized and are connected with Ti3+ surrounded by six oxygens. A centre model is discussed in terms of configuration coordinate curves.

Studies of the phosphorescence of polycrystalline hafnia

“…The published TL studies of undoped and Ti-doped ZrO 2 have reported several peaks in the temperature range À 50 to 200 1C [11,[22][23][24][25][26][27]. While there is no complete agreement between these studies on the TL peak positions, most studies have found 3 peaks, with the strongest peak in the range 20-30 1C and weaker peaks near À 25 1C and in the range 100-130 1C.…”

“…Subsequent studies [22,25] found that the phosphorescence of ZrO 2 is enhanced by doping with Ti, with the optimum doping level around 0.08 mol% [25]. It was proposed that the luminescent center is formed by a Ti 3 + ion that substitutes for Zr 4 + , and that sixfold O-atom coordination around Ti 3 + facilitates the formation of a V 2 À oxygen vacancy [22]. Therefore, in the more recent work it has been usually accepted that Ti is the phosphorescence activator in ZrO 2 [24,26,27].…”

Photoluminescence quenching of Zirconia nanoparticle by surface modification

“…There have been lot of studies on the luminescent properties of ZrO 2 , but still there is a lack of clarification for the luminescent mechanisms in ZrO 2 . In general, luminescence from NPs is thought to be related to defects and/or impurities in the system [25,[29][30][31][32]. In ZrO 2 -NPs, the involvement of mid gap traps such as surface defects and oxygen vacancies defects (F+ centers) make contribution towards luminescence properties.…”

Бадделеит Из Ильменитовых Россыпей Украины И Его Эпр-Характеристики

“…В основном работы посвящены изучению трехвалентных ионов примесей, вводимых при синтезе нанопорошков для стабилизации тетрагональной симметрии диоксида циркония при комнатной температуре [2,[3][4][5][6][7].…”

“…Литературных источников по данной тематике в разделе минералогия минералов, исследование методом ЭПР не выявлено. В основном работы направлены по изучению синтетических аналогов и представлены в работах [3][4][5][6][7]. Они посвящены изучению трехвалентных ионов примесей, вводимых при синтезе нанопорошков для стабилизации тетрагональной симметрии диоксида циркония при комнатной температуре.…”