Abstract
Lead halide perovskite CsPbBr3 nanocrystals (NCs) have attracted great interest in recent years owing to their excellent properties such as strong light absorption, high photoluminescence quantum yield (PLQY), good wavelength tunability, and narrow FWHM. However, their instability is still a bottleneck for their potential application. In this work, a pseudo-peritectic method, which is a peritectic reaction in solutions, was proposed. The phenomenon of “Survival of the fittest” was observed. The synthesized CsPb2Br5 phase greatly reduces the surface defects, and improves the stability and PL properties. The pseudo-peritectic method using for preparing surface modified CsPbBr3@CsPb2Br5 nanocrystals is a significant pathway to achieve long-term stable lead halide perovskite for optoelectronic devices.
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