Dual-band photoluminescence of lead selenide quantum dots doped oxyfluoride glass-ceramics containing BaF₂ nanocrystals

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• 作者：Qiaoyun Yin ; Jihong Zhang ; Chao Liu ; Jun Xie ; Byoung Jin So ; Jong Heo ; Xiujian Zhao
• 关键词：PbSe quantum dots ; Glass ceramics ; Broad-band photoluminescence ; Dual-band photoluminescence ; Quantum confinement effect
• 刊名：Journal of Non-Crystalline Solids
• 出版年：1 February, 2014
• 年：2014
• 卷：385
• 期：Complete
• 页码：136-141
• 全文大小：1725 K

文摘

In this work, PbSe QDs were precipitated in oxyfluoride glass-ceramics containing BaF₂ nanocrystals. Tunable and broad absorption and photoluminescence from PbSe QDs doped glass-ceramics were observed in the near-infrared wavelength range. When the glasses were heat-treated at temperatures below 560 掳C using one-step heat-treatment schedule, single photoluminescence band was observed from each sample. Upon high temperature (560 掳C or 570 掳C) one-step or two-step heat-treatment, dual-band photoluminescence was observed. These two photoluminescence bands in each spectrum were separated by a gap of ~ 110-150 meV, and as a result, effective full width at half maximum as large as ~ 500 nm was recorded.