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- Title
Precursor Tailoring Enables Alkylammonium Tin Halide Perovskite Phosphors for Solid‐State Lighting.
- Authors
Li, Ziliang; Deng, Zhengtao; Johnston, Andrew; Luo, Jingwei; Chen, Haijie; Dong, Yitong; Sabatini, Randy; Sargent, Edward H.
- Abstract
Broadband emission with a large Stokes shift is of interest for applications in solid‐state lighting. Such emission is often achieved with self‐trapped excitons; however, in reduced‐dimensional perovskites, high‐performance self‐trapped emission has, until now, been widely observed only in lead‐based materials. Here, the synthesis in an air ambient of reduced‐dimensional Sn‐based perovskite phosphors R2 +xSnI4 +x [R = octylammonium (OTA), hexylammonium (HA) or butylammonium (BA)] is reported, an advance achieved by tailoring the synthesis of the Ruddlesden‐Popper 2D perovskites R2SnI4. The lead‐free R2 +xSnI4 +x phosphors have broadband self‐trapped emission with over 80% photoluminescence quantum yield (PLQY) and more than a 150 nm Stokes shift. White‐light‐emitting diodes (WLEDs) based on OTA2 +xSnI4 +x phosphors exhibit warm‐white emission (correlated color temperature = 2654K) suited to home lighting, and a CRI of 92, among the best for Pb‐free perovskite WLEDs reported to date.
- Subjects
PHOSPHORS; PEROVSKITE; STOKES shift; COLOR temperature; LIGHTING; EXCITON theory; TIN
- Publication
Advanced Functional Materials, 2022, Vol 32, Issue 18, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202111346