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

Roccanova, Rachel; Yangui, Aymen; Nhalil, Hariharan; Shi, Hongliang; Du, Mao -Hua; Saparov, Bayrammurad

doi:10.1021/acsaelm.9b00015

Title: Near-Unity Photoluminescence Quantum Yield in Blue-Emitting Cs₃Cu₂Br_5–xI_x(0 ≤ x ≤ 5)

Journal Article · Mon Mar 11 00:00:00 EDT 2019 · ACS Applied Electronic Materials

DOI:https://doi.org/10.1021/acsaelm.9b00015· OSTI ID:1507857

Roccanova, Rachel ^[1];

^[1]; Nhalil, Hariharan ^[2]; Shi, Hongliang ^[3];

^[4];

^[1]

Univ. of Oklahoma, Norman, OK (United States)
Bar-Ilan Univ., Ramat-Gan (Israel)
Beihang Univ., Beijing (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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 Cs₃Cu₂Br_5–xI_x (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 Cs₃Cu₂Br_5–xI_x.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1507857

Journal Information:: ACS Applied Electronic Materials, Vol. 1, Issue 3; ISSN 2637-6113

Publisher:: ACS PublicationsCopyright Statement

Country of Publication:: United States

Language:: English

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

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Title: Near-Unity Photoluminescence Quantum Yield in Blue-Emitting Cs₃Cu₂Br_5–xI_x(0 ≤ x ≤ 5)