纳米晶
光致发光
化学
卤化物
胶体
兴奋剂
金属
钙钛矿(结构)
量子点
纳米技术
荧光
化学物理
化学工程
结晶学
无机化学
物理化学
光电子学
材料科学
物理
光学
工程类
有机化学
作者
Simon F. Solari,Lok-Nga Poon,Michael Wörle,Frank Krumeich,Yen‐Ting Li,Yu‐Cheng Chiu,Chih‐Jen Shih
摘要
Colloidal metal halide perovskite (MHP) nanocrystals (NCs) are an emerging class of fluorescent quantum dots (QDs) for next-generation optoelectronics. A great hurdle hindering practical applications, however, is their high lead content, where most attempts addressing the challenge in the literature compromised the material's optical performance or colloidal stability. Here, we present a postsynthetic approach that stabilizes the lead-reduced MHP NCs through high-entropy alloying. Upon doping the NCs with multiple elements in considerably high concentrations, the resulting high-entropy perovskite (HEP) NCs remain to possess excellent colloidal stability and narrowband emission, with even higher photoluminescence (PL) quantum yields, ηPL, and shorter fluorescence lifetimes, τPL. The formation of multiple phases containing mixed interstitial and doping phases is suggested by X-ray crystallography. Importantly, the crystalline phases with higher degrees of lattice expansion and lattice contraction can be stabilized upon high-entropy alloying. We show that the lead content can be approximately reduced by up to 55% upon high-entropy alloying. The findings reported here make one big step closer to the commercialization of perovskite NCs.
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