Photo- and radioluminescence of lithium hafnate Li₂HfO₃

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• 作者：Ya V. Baklanova^a ; ^{baklanovay@ihim.uran.ru} ; 袗.V. Ishchenko^b ; 孝.袗. Denisova^a ; L.G. Maksimova^a ; B.V. Shulgin^b ; V.袗. Pustovarov^b ; L.V. Viktorov^b
• 关键词：Lithium hafnate ; Time-resolved spectroscopy ; Low-temperature luminescence VUV spectroscopy ; Radioluminescence ; Scintillator ; Self-trapped excitons
• 刊名：Optical Materials
• 出版年：2012
• 期刊代码：81_09253467
• 类别：ch
• 出版时间：May, 2012
• 卷：34
• 期：7
• 页码：1037-1041
• 文件大小：720 K

摘要

Photoluminescence, excitation and pulse cathode luminescence spectra, and decay kinetics of lithium hafnate Li₂HfO₃ were investigated at temperatures 300 and 7.5 K. Time-resolved luminescence spectra were excited with synchrotron radiation in UV-VUV range. Strong emission with the peak position at 4.42 eV and with the decay time in 渭s range was revealed at T = 7.5 K. The emission was attributed to radiative decay of self-trapped excitons (STE). The features observed in the excitation spectra at 6.6 eV were likely to take place because of the exciton formation, with inter-band transitions dominating at 6.7 eV. Crystal structure defects underpin the luminescence spectra formation at room temperature in the frame of vacancy model.