Intrinsic White-Light Emission from Layered Hybrid Perovskites
Intrinsic White-Light Emission from Layered Hybrid Perovskites
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DOI：
10.1021/ja507086b
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发表时间：
2014-09-24
影响因子：
15
通讯作者：
Karunadasa, Hemamala I.
中科院分区：
文献类型：
--
作者：
Dohner, Emma R.;Jaffe, Adam;Karunadasa, Hemamala I.
我们报告了第二族具有改进的光致发光量子效率（PLQE）的分层钙钛矿白光发射体。在近紫外激发下，两种新的Pb-Cl和Pb-Br钙钛矿分别发射宽带“冷”和“暖”白色光，具有高的显色性。从大的，单晶体的发射表明，从散装材料的起源，而不是表面缺陷的网站。Pb-Br钙钛矿具有9%的PLQE，其在连续照射3个月后未减少。我们的机制研究表明，发射有贡献的强电子-声子耦合在一个可变形的晶格和分布的本征陷阱态。这些混合物提供了一个可调的平台，用于将有机材料的易加工性与结晶无机固体的结构定义相结合。
We report on the second family of layered perovskite white-light emitters with improved photoluminescence quantum efficiencies (PLQEs). Upon near-ultraviolet excitation, two new Pb-Cl and Pb-Br perovskites emit broadband "cold" and "warm" white light, respectively, with high color rendition. Emission from large, single crystals indicates an origin from the bulk material and not surface defect sites. The Pb-Br perovskite has a PLQE of 9%, which is undiminished after 3 months of continuous irradiation. Our mechanistic studies indicate that the emission has contributions from strong electron-phonon coupling in a deformable lattice and from a distribution of intrinsic trap states. These hybrids provide a tunable platform for combining the facile processability of organic materials with the structural definition of crystalline, inorganic solids.