writer：Hao Zhang, Xuemei Wang, Ning Ai, Jianli Wang
keywords：defect passivation, perovskite nanocrystal, photoluminescence, polyethersulfone, stability
source：期刊
specific source：Luminescence.
Issue time：2024年

同时提高无机钙钛矿纳米晶体（NCs）的稳定性和光致发光量子产率（PLQY）对其在各种光电器件中的实际应用至关重要。本文采用原位共沉淀法制备了聚醚砜(PES)包覆CsPbBr3 NCs。PES中的砜基团与CsPbBr3 NCs上的欠配位铅离子（Pb²⁺）结合，显著减少了表面缺陷，从而将PLQY从74.2%提高到88.3%。同时，pes包覆的NCs具有较高的耐水性和优异的热稳定性和光稳定性，在热老化（70℃，4 h）和连续365 nm紫外（UV）光照射（24 W, 8 h）条件下保持了初始PL强度的85%以上。相比之下，对照 NCs 的PL强度急剧下降到40%以下。最后，利用PES包覆的CsPbBr3 NCs制备了发光白光的二极管，其色域达到NTSC标准的110%。

Simultaneously improving the stability and photoluminescence quantum yield (PLQY) of all inorganic perovskite nanocrystals (NCs) is crucial for their practical utilization in various optoelectronic devices. Here, CsPbBr3 NCs coated with polyethersulfone (PES) were prepared via an in-situ co-precipitation method. The sulfone groups in PES bind to undercoordinated lead ion (Pb²⁺) on the CsPbBr3 NCs, resulting in significant reduction of surface defects, thus enhancing the PLQY from 74.2% to 88.3%. Meanwhile, the PES-coated NCs exhibit high water resistance and excellent heat and light stability, maintaining over 85% of the initial PL intensity under thermal aging (70℃, 4 h) and continuous 365 nm ultraviolet (UV) light irradiation (24 W, 8 h) conditions. By contrast, the PL intensity of the control NCs dramatically dropped to less than 40%. Finally, a diode emitting bright white light was fabricated utilizing the PEScoated CsPbBr3 NCs, which exhibits a color gamut of ~110% NTSC standard.

国家自然科学基金(资助号:22109138和22178317)资助。

https://doi.org/10.1002/bio.4734