Worku Michael, Tian Yu, Zhou Chenkun, Lin Haoran, Chaaban Maya, Xu Liang-Jin, He Qingquan, Beery Drake, Zhou Yan, Lin Xinsong, Su Yi-Feng, Xin Yan, Ma Biwu
Materials Science and Engineering Program, Florida State University, Tallahassee, FL 32306, USA.
Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Florida State University, Tallahassee, FL 32310, USA.
Sci Adv. 2020 Apr 24;6(17):eaaz5961. doi: 10.1126/sciadv.aaz5961. eCollection 2020 Apr.
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 (CsPbBr) perovskite hollow NCs. By facile solution processing of CsPbBr precursor solution containing ethylenediammonium bromide and sodium bromide, in situ formation of hollow CsPbBr NCs with controlled particle and pore sizes is realized. Synthetic control of hollow nanostructures with quantum confinement effect results in color tuning of CsPbBr NCs from green to blue, with high PLQEs of up to 81%.
金属卤化物钙钛矿纳米晶体（NCs）已成为新一代发光材料，具有窄发射和高光致发光量子效率（PLQEs）。已发现各种类型的钙钛矿NCs，如片状、线状和立方体形，在整个可见光谱范围内均表现出可调谐发射。尽管钙钛矿NCs领域取得了显著进展，但无机NCs中的许多纳米结构尚未在金属卤化物钙钛矿中实现，并且生产高效蓝色发光钙钛矿NCs仍然具有挑战性且备受关注。在此，我们报告了高效蓝色发光溴化铯铅（CsPbBr）钙钛矿空心NCs的发现。通过对含有溴化乙二铵和溴化钠的CsPbBr前驱体溶液进行简便溶液处理，实现了具有可控颗粒和孔径的空心CsPbBr NCs的原位形成。对具有量子限制效应的空心纳米结构进行合成控制，导致CsPbBr NCs从绿色到蓝色的颜色调谐，PLQEs高达81%。
