放射发光
磷光
卤化物
材料科学
发射光谱
钙钛矿(结构)
谱线
分析化学(期刊)
荧光
光学
无机化学
化学
结晶学
闪烁体
物理
探测器
色谱法
天文
作者
Yang Li,Liang Chen,Bo Liu,Jinlu Ruan,Jinliang Liu,Xiaoping Ouyang,Qiang Xu
标识
DOI:10.1016/j.ceramint.2022.02.222
摘要
Recently, all-inorganic cesium lead-halide perovskites have shown their promise for light emission applications, due to the excellent optical performance. Herein, we report that the initially nonphosphorescent undoped lead-halide Cs 4 PbBr 6 single crystals (SCs) exhibit an ultralong phosphorescence emission under X-ray excitation at low temperatures. It is shown that the dramatic change has been taken place in radioluminescence spectra and the broad-band emission gradually appeared with the decrease of temperature. Below 210 K, the radioluminescence spectra can be deconvoluted into one narrow peak located at 530 nm and two broad peaks centered at 595 nm and 672 nm respectively. Subsequently, the time-dependent radioluminescence spectra in undoped lead-halide Cs 4 PbBr 6 SCs were investigated. The ultralong phosphorescence emission can persist over 120 min at 70 K. We consider that ultralong phosphorescence originates from defect-related emission. To the best of our knowledge, our finding is the first time that undoped Cs 4 PbBr 6 SCs exhibit the phosphorescence emission, which will offer a paradigm to motivate revolutionary applications on perovskite.
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