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| 1 | Samarium doping improves luminescence efficiency of Cs_(3)Bi_(2)Br_(g)perovskite quantum dots enabling efficient white light-emitting diodes显示文摘Considering the toxicity problem of lead-based perovskite quantum dots(PQDs),the lead-free Cs_(3)Bi_(2)Br_(g)PQDs has been recognized as one of the promising candidates.However,the low photoluminescence quantum yields(PLQYs)hinder its practical application in optoelectronic devices.Here,w e successfully prepared Sm^(3+)ions doped Cs_(3)Bi_(2)Br_(g)PQDs with effective white light-emission by modified ligandassisted recrystallization method.The realization of white light-emission is attributed to the broadband blue emission of excitons and the red emission(^(4)G_(5/2)-^(6)HJ(J=5/2,7/2,9/2))of Sm^(3+)ions for Sm^(3+)ions doped Cs_(3)Bi_(2)Br_(g)PQDs.More importantly,compared with the undoped Cs_(3)Bi_(2)Br_(g)PQDs,the PLQYs of Sm^(3+)ions doped Cs_(3)Bi_(2)Br_(g)PQDs are improved from 10.9%to 20.8%,and the anti-water stability is also obviously improved.Finally,the Sm^(3+)ions doped PQDs based white light-emitting diodes(LEDs)with luminous efficiency of 12.6 lm/W were explored,which indicates that there is a potential prospect of lead-free PQDs in white light lighting application. | Yongsheng Zhu Jinyang Zhu Haizhen Song Jinshu Huang Zhiwen Lu Gencai Pan | 2021 | Journal of Rare Earths2021，39，4： | 7 |
| 2 | 高温固相法制备CaWO_(4):Tb^(3+)荧光粉及其发光性质研究显示文摘钨酸钙具有稳定的化学性质,是良好的基质材料。利用高温固相法制备CaWO_(4):Tb^(3+)荧光粉,使用X射线衍射(XRD)对荧光粉的纯度进行检测,使用荧光光谱仪对样品进行分析,得到激发光谱和发射光谱,并对两个光谱进行分析,得到结论:最佳激发波长为375 nm,主要发生^(7)F_(6)→^(5)D_(3)跃迁;发射光谱用255 nm的光激发,得到最佳发射波长为545 nm,主要发生^(5)D_(4)→^(7)F_(5)跃迁。观察不同浓度Tb^(3+)掺杂的钨酸钙荧光粉发射光谱发现,相对发光强度先提高,达到峰值后由于发生浓度猝灭而下降,当x=0.03时,CaWO_(4):xTb^(3+)的发光强度最高,是最佳掺杂浓度。 | 刘新越 曹乐怡 朱亚男 潘建顺 吴宏越 李琳琳 | 2022 | 现代盐化工2022，49，3： | 2 |
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