All-Inorganic Lead-Free 0D Perovskites by a Doping Strategy to Achieve a PLQY Boost from <2 % to 90 .,Angewandte Chemie International Edition

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All-Inorganic Lead-Free 0D Perovskites by a Doping Strategy to Achieve a PLQY Boost from <2 % to 90 .
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-04-26 , DOI: 10.1002/anie.202003234
Peigeng Han _{1,

2} , Cheng Luo _{1,

2} , Songqiu Yang ₁ , Yang Yang ₁ , Weiqiao Deng ₃ , Keli Han _{1,

3}

Affiliation

Zero‐dimensional (0D) lead‐free perovskites have unique structures and optoelectronic properties. Undoped and Sb‐doped all inorganic, lead‐free, 0D perovskite single crystals A₂InCl₅(H₂O) (A=Rb, Cs) are presented that exhibit greatly enhanced yellow emission. To study the effect of coordination H₂O, Sb‐doped A₃InCl₆ (A=Rb, Cs) are also synthesized and further studied. The photoluminescence (PL) color changes from yellow to green emission. Interestingly, the photoluminescence quantum yield (PLQY) realizes a great boost from <2 % to 85–95 % through doping Sb³⁺. We further explore the effect of Sb³⁺ dopants and the origin of bright emission by ultrafast transient absorption techniques. Furthermore, Sb‐doped 0D rubidium indium chloride perovskites show excellent stability. These findings not only provide a way to design a set of new high‐performance 0D lead‐free perovskites, but also reveal the relationship between structure and PL properties.

中文翻译：

通过掺杂策略实现PLQY从2％提高到90的全无机无铅0D钙钛矿。

零维（0D）无铅钙钛矿具有独特的结构和光电特性。呈现出未掺杂和Sb掺杂的所有无机，无铅，0D钙钛矿单晶A ₂ InCl ₅（H ₂ O）（A = Rb，Cs），其黄光发射大大增强。为了研究配位H ₂ O的影响，还合成了掺Sb的A ₃ InCl ₆（A = Rb，Cs）并进一步研究。光致发光（PL）颜色从黄色变为绿色。有趣的是，通过掺杂Sb ³⁺，光致发光量子产率（PLQY）从<2％大幅提高到85-95％。我们进一步探索Sb ³⁺的作用掺杂和超快瞬态吸收技术产生的明亮发射的起源。此外，掺Sb的0D chloride氯化铟铟钙钛矿显示出出色的稳定性。这些发现不仅提供了一种设计新的高性能0D无铅钙钛矿的方法，而且还揭示了结构与PL性能之间的关系。

更新日期：2020-04-26

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