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Strongly Coupled Tin‐Halide Perovskites to Modulate Light Emission: Tunable 550–640 nm Light Emission (FWHM 36–80 nm) with a Quantum Yield of up to 6.4%
Author(s) -
Chen MinYi,
Lin JinTai,
Hsu ChiaShuo,
Chang ChungKai,
Chiu ChingWen,
Chen Hao Ming,
Chou PiTai
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201706592
Subject(s) - full width at half maximum , quantum yield , materials science , tin , halide , perovskite (structure) , nucleation , yield (engineering) , photoluminescence , quantum efficiency , analytical chemistry (journal) , optoelectronics , inorganic chemistry , crystallography , optics , chemistry , organic chemistry , physics , metallurgy , fluorescence
Colloidal perovskite quantum dots represent one of the most promising materials for applications in solar cells and photoluminescences. These devices require a low density of crystal defects and a high yield of photogenerated carriers, which are difficult to realize in tin‐halide perovskite because of the intrinsic instability of tin during nucleation. Here, an enhancement in the luminescent property of tin‐halide perovskite nanoplates (TPNPs) that are composed of strongly coupled layered structures with the chemical formula of PEA 2 SnX 4 (PEA = C 6 H 5 (CH 2 ) 2 NH 3 , X = Br, I) is reported. TPNPs (X = I) show an emission at a wavelength of 640 nm, with high quantum yield of 6.40 ± 0.14% and full width at half maximum (FWHM) as small as 36 nm. The presence of aliphatic carboxylic acid is found to play a key role in reducing the tin perovskite defect density, which significantly improves the emission intensity and stability of TPNPs. Upon mixing iodo‐ and bromo‐ precursors, the emission wavelength is successfully tuned from 640 nm (PEA 2 SnI 4 ) to 550 nm (PEA 2 SnBr 4 ), with a corresponding emission quantum yield and FWHM of 0.16–6.40% and 36–80 nm, respectively. The results demonstrate a major advance for the emission yield and tunability of tin‐halide perovskites.