Near-Unity Photoluminescence Quantum Yield in Blue-Emitting Cs3Cu2Br5–xIx(0 ≤ x ≤ 5)

Recently, interest in developing efficient, low-cost, nontoxic, and stable metal halide emitters that can be incorporated into solid-state lighting technologies has taken hold. Here we report nontoxic, stable, and highly efficient blue-light-emitting Cs3Cu2Br5–xIx (0 ≤ x ≤ 5). Room-temperature photo...

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Bibliographic Details
Published in:ACS applied electronic materials 2019-03, Vol.1 (3)
Main Authors: Roccanova, Rachel, Yangui, Aymen, Nhalil, Hariharan, Shi, Hongliang, Du, Mao -Hua, Saparov, Bayrammurad
Format: Article
Language:English
Subjects:
0D all-inorganic metal halides
density functional theory
high blue photoluminescence quantum yield
MATERIALS SCIENCE
Pb-free
thermal and air stability
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Summary:Recently, interest in developing efficient, low-cost, nontoxic, and stable metal halide emitters that can be incorporated into solid-state lighting technologies has taken hold. Here we report nontoxic, stable, and highly efficient blue-light-emitting Cs3Cu2Br5–xIx (0 ≤ x ≤ 5). Room-temperature photoluminescence measurements show bright blue emission in the 456 to 443 nm range with near-unity quantum yield for Cs3Cu2I5. Here, density functional theory calculations and power-dependent PL measurements suggest that the emission results from self-trapped excitons induced by strong charge localization within the zero-dimensional cluster structure of Cs3Cu2Br5–xIx.
ISSN:2637-6113
2637-6113
DOI:10.1021/acsaelm.9b00015