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Aluminum‐Doped Cesium Lead Bromide Perovskite Nanocrystals with Stable Blue Photoluminescence Used for Display Backlight
Advanced Science ( IF 14.3 ) Pub Date : 2017-07-31 , DOI: 10.1002/advs.201700335
Ming Liu 1 , Guohua Zhong 2 , Yongming Yin 1 , Jingsheng Miao 1 , Ke Li 1 , Chengqun Wang 1 , Xiuru Xu 1 , Clifton Shen 1 , Hong Meng 1
Affiliation  

Bright and stable blue emitters with narrow full‐width at half‐maxima are particularly desirable for applications in television displays and related technologies. Here, this study shows that doping aluminum (Al3+) ion into CsPbBr3 nanocrystals (NCs) using AlBr3 can afford lead‐halide perovskites NCs with stable blue photoluminescence. First, theoretical and experimental analyses reveal that the extended band gap and quantum confinement effect of elongated shape give rise to the desirable blueshifted emission. Second, the aluminum ion incorporation path is rationalized qualitatively by invoking fundamental considerations about binding relations in AlBr3 and its dimer. Finally, the absence of anion‐exchange effect is corroborated when green CsPbBr3 and blue Al:CsPbBr3 NCs are mixed. Combinations of the above two NCs with red‐emitting CdSe@ZnS NCs result in UV‐pumped white light‐emitting diodes (LED) with an National Television System Committee (NTSC) value of 116% and ITU‐R Recommendation B.T. 2020 (Rec. 2020) of 87%. The color coordinates of the white LED are optimized at (0.32, 0.34) in CIE 1931. The results suggest that low‐cost, earth‐abundant, solution‐processable Al‐doped perovskite NCs can be promising candidate materials for blue down‐conversion layer in backlit displays.

中文翻译:


用于显示器背光源的具有稳定蓝色光致发光的铝掺杂铯溴化铅钙钛矿纳米晶



具有窄半峰全宽的明亮且稳定的蓝色发射器特别适用于电视显示器和相关技术的应用。本研究表明,使用 AlBr 3将铝 (Al 3+ ) 离子掺杂到 CsPbBr 3纳米晶体 (NC) 中可以得到具有稳定蓝色光致发光的卤化铅钙钛矿 NC。首先,理论和实验分析表明,拉长形状的扩展带隙和量子限制效应产生了理想的蓝移发射。其次,通过对 AlBr 3及其二聚体中的结合关系进行基本考虑,铝离子掺入路径在定性上合理化。最后,当绿色 CsPbBr 3和蓝色 Al:CsPbBr 3 NC 混合时,证实了阴离子交换效应的不存在。上述两种 NC 与发红光的 CdSe@ZnS NC 的组合产生了紫外线泵浦白光发光二极管 (LED),其国家电视系统委员会 (NTSC) 值为 116%,符合 ITU-R 建议 BT 2020 (Rec. 2020 年)达 87%。在 CIE 1931 中,白光 LED 的色坐标优化为 (0.32, 0.34)。结果表明,低成本、地球储量丰富、可溶液加工的掺铝钙钛矿 NC 可以成为蓝色下转换层的有前途的候选材料在背光显示器中。
更新日期:2017-07-31
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