Hollow metal halide perovskite nanocrystals with efficient blue emissions
Hollow metal halide perovskite nanocrystals with efficient blue emissions
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DOI：
10.1126/sciadv.aaz5961
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发表时间：
2019-08
期刊：
影响因子：
13.6
通讯作者：
Michael Worku;Yu Tian;Chenkun Zhou;Haoran Lin;Maya Chaaban;Liang-jin Xu;Qingquan He;Drake Beery-
中科院分区：
文献类型：
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作者：
Michael Worku;Yu Tian;Chenkun Zhou;Haoran Lin;Maya Chaaban;Liang-jin Xu;Qingquan He;Drake Beery-
中空纳米结构使得能够利用来自溴化铯铅的有效蓝色发射来对金属卤化物钙钛矿进行颜色调谐。金属卤化物钙钛矿纳米晶体（NC）已经成为具有窄发射和高光致发光量子效率（PLQE）的新一代发光材料。各种类型的钙钛矿NC，例如，已经发现薄片、线和立方体在整个可见光谱上显示出可调谐的发射。尽管在钙钛矿NC领域取得了显着进展，但无机NC中的许多纳米结构尚未在金属卤化物钙钛矿中实现，并且生产高效的蓝光发射钙钛矿NC仍然具有挑战性和极大的兴趣。在这里，我们报告了高效蓝色发射溴化铯铅（CsPbBr3）钙钛矿中空NC的发现。通过对含有溴化乙二铵和溴化钠的CsPbBr 3前体溶液的简易溶液处理，实现了具有受控颗粒和孔径的中空CsPbBr 3 NC的原位形成。具有量子限制效应的中空纳米结构的合成控制导致CsPbBr 3 NC从绿色到蓝色的颜色调谐，具有高达81%的高PLQE。
A hollow nanostructure enables color tuning of metal halide perovskites with efficient blue emissions from cesium lead bromide. Metal halide perovskite nanocrystals (NCs) have emerged as new-generation light-emitting materials with narrow emissions and high photoluminescence quantum efficiencies (PLQEs). Various types of perovskite NCs, e.g., platelets, wires, and cubes, have been discovered to exhibit tunable emissions across the whole visible spectrum. Despite remarkable advances in the field of perovskite NCs, many nanostructures in inorganic NCs have not yet been realized in metal halide perovskites, and producing highly efficient blue-emitting perovskite NCs remains challenging and of great interest. Here, we report the discovery of highly efficient blue-emitting cesium lead bromide (CsPbBr3) perovskite hollow NCs. By facile solution processing of CsPbBr3 precursor solution containing ethylenediammonium bromide and sodium bromide, in situ formation of hollow CsPbBr3 NCs with controlled particle and pore sizes is realized. Synthetic control of hollow nanostructures with quantum confinement effect results in color tuning of CsPbBr3 NCs from green to blue, with high PLQEs of up to 81%.