The influence of intrinsic and impurity defects on the luminescent properties of zirconia

Theoretical Calculations Meet Experiment to Explain the Luminescence Properties and the Presence of Defects in m-ZrO2

“…79 These particular features have been reported experimentally for m-ZrO 2 . 15,16 To argue that the blue luminescence is due to the presence of Ti In the lines of these studies, our point defect calculations demonstrated that Ti 4+ species are preferentially formed for most of the synthesis conditions, especially under O-rich atmospheres. In the extreme O-rich limit, the defect formation enthalpies for T i Zr are so small that Ti doping can be easily done and thus increase the photoluminescence intensity.…”

“…Nevertheless, quenching phenomena have been reported when the concentration in titanium impurites increases above ≈1 wt%, 16 and one may wonder if intermediate situations are…”

“…). Consequently, to account for the long lasting luminescence observed at ≈2.6 eV for ZrO 2 :Ti compounds after excitation at ≈2.6 eV, 16 it is quite possible that electron resulting from an…”

“…12, 16,21 Here, oxygen vacancies are assumed to participate to the reduction of titanium species (Ti 4+ → Ti 3+ ), explaining the close connection with the enhancement of the luminescence band for crystal growths with the presence of a reducing agent. 16 Surprisingly, Ti 3+ species have not been identified by EPR measurements 16 except at the surface of the samples. 22 Other sources for the luminescence at ≈2.6 eV can be found within the literature.…”

Механизмы Термостимулированной Люминесценции В Уф-Облученных Нанотрубках Диоксида Циркония

“…Кроме того, в ряде работ методами термостимулированной люминесценции (ТСЛ) в спектральной области 400−650 nm были исследованы порошки моноклинного ZrO 2 в исходном состоянии и после высокотемпературных обработок на воздухе [7,[9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24], в вакууме [35] или в атмосфере аргона [26]. Были получены экспериментальные подтверждения наличия ловушек носителей заряда, активных ниже комнатной температуры (223−293 K) [26] и в широком температурном диапазоне от 300 до 750 K [7,[19][20][21][22][23][24][25] после облучения образцов электронным пучком [7,19,25], β- [20][21][22][23] или УФ-излучением [24,26]. Исследования нанотубулярных структур диоксида циркония методом ТСЛ к настоящему времени не известны.…”