Bright Luminescence from Nontoxic CsCu2X3 (X = Cl, Br I)

Roccanova, Rachel; Yangui, Aymen; Seo, Gijun; Creason, Tielyr D.; Wu, Yuntao; Kim, Do Young; Du, Mao-Hua; Saparov, Bayrammurad

doi:10.1021/acsmaterialslett.9b00274

Title: Bright Luminescence from Nontoxic CsCu₂X₃ (X = Cl, Br I)

Journal Article · Thu Sep 05 00:00:00 EDT 2019 · ACS Materials Letters

DOI:https://doi.org/10.1021/acsmaterialslett.9b00274· OSTI ID:1569366

Roccanova, Rachel ^[1];

^[1]; Seo, Gijun ^[2]; Creason, Tielyr D. ^[1]; Wu, Yuntao ^[3];

^[2];

^[4];

^[1]

Univ. of Oklahoma, Norman, OK (United States). Dept. of Chemistry and Biochemistry
Oklahoma State Univ., Tulsa, OK (United States). School of Materials Science and Engineering
Chinese Academy of Sciences, Shanghai (China). Shanghai Inst. of Ceramics, Synthetic Crystal Research Center; Univ. of Tennessee, Knoxville, TN (United States). Scintillation Materials Research Center and Dept. of Materials Science and Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division

Inexpensive and highly efficient luminescent materials based on multinary halides have received increased attention in recent years. Among those considered most promising are the perovskites such as CsPbX₃ because of their highly efficient and tunable emission through precise control of chemical composition and nanostructuring. However, the presence of the toxic heavy metal Pb and relatively poor stability are among the major challenges for the introduction of lead-halide-based materials into the marketplace. In this paper, we report the optical properties of nontoxic and highly emissive one-dimensional (1D) all-inorganic halides CsCu₂X₃ (X = Cl, Br, I) and their mixed halide derivatives, which also show improved thermal and air stability. Photoluminescence (PL) measurements show tunable bright room temperature emission from green to yellow with photoluminescence quantum yields ranging from 0.37 (CsCu₂Cl_1.5Br_1.5) to 48.0% (CsCu₂Cl₃). Temperature- and power-dependent PL measurements suggest that the emission results from self-trapped excitons induced by strong charge localization and structural distortions within the lD ribbon structure.

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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:: 1569366

Journal Information:: ACS Materials Letters, Vol. 1, Issue 4; ISSN 2639-4979

Publisher:: ACS PublicationsCopyright Statement

Country of Publication:: United States

Language:: English

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