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Scientists Synthesize Undoped and Sb-doped Lead-free Zero-dimensional Perovskites

May 09, 2020

A research team led by HAN Keli from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences synthesized undoped and Sb-doped lead-free zero-dimensional (0D) perovskites. Doping Sb3+ ions achieved a significant boost of the photoluminescence quantum yield (PLQY) from less than 2% to 85-95%.

They further investigated the stability and dynamics mechanism. Their findings were published in Angew. Chem. Int. Ed.

All-inorganic lead-free 0D perovskites have drawn wide attention due to non-toxicity, unique structures and optoelectronic properties.

Previous studies have focused on the stability of all-inorganic lead-free 0D perovskite, but the PLQY is still very low compared to organic-inorganic hybrid 0D perovskite. Therefore, it's needed to develop highly efficient and stable all-inorganic lead-free 0D perovskite and clarify its dynamics mechanism.

 

PL spectra and photographs under UV light of the 0D In-based perovskites (Image by HAN Peigeng and LUO Cheng)  

The scientists synthesized Sb-doped lead-free direct bandgap In-based 0D perovskites A2InCl5 (H2O) : Sb (A = Rb, Cs), which showed enhanced yellow photoluminescence (PL) emission. To study the effect of coordination H2O, A3InCl6 : Sb (A = Rb, Cs) were also synthesized and showed bright green emission.

They further explored the effect of Sb3+ dopants and the origin of bright emission by ultrafast transient absorption techniques. In addition, Sb-doped 0D rubidium indium chloride perovskites exhibited excellent stability.

Their findings not only provided a way to design a set of new high-performance 0D lead-free perovskites, but also revealed the relationship between structure and PL properties.

This study was supported by the key research project of National Natural Science Foundation.

All‐Inorganic Lead‐Free 0D Perovskites Through Doping Strategy Achieving A Boost of PLQY from < 2% to 90%

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