(NH 4 ) 2 AgX 3 (X = Br, I): 1D Silver Halides with Broadband White Light Emission and Improved Stability

Creason, Tielyr D.; Fattal, Hadiah; Gilley, Isaiah W.; McWhorter, Timothy M.; Du, Mao-Hua; Saparov, Bayram

doi:10.1021/acsmaterialsau.1c00009

Title: (NH ₄ ) ₂ AgX ₃ (X = Br, I): 1D Silver Halides with Broadband White Light Emission and Improved Stability

Journal Article · Thu Jun 17 00:00:00 EDT 2021 · ACS Materials Au

DOI:https://doi.org/10.1021/acsmaterialsau.1c00009· OSTI ID:1797547

Creason, Tielyr D. ^[1]; Fattal, Hadiah ^[1]; Gilley, Isaiah W. ^[1]; McWhorter, Timothy M. ^[1];

^[2];

^[1]

Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States

Recently, ternary copper(I) halides have emerged as alternatives to lead halide perovskites for light emission applications. Despite their high-efficiency photoluminescence (PL) properties, most copper(I) halides are blue emitters with unusually poor tunability of their PL properties. Here, we report the impact of substitution of copper with silver in the high-efficiency blue-emitting Cu(I) halides through hydrothermal synthesis and characterization of (NH₄)₂AgX₃ (X = Br, I). (NH₄)₂AgX₃ are found to exhibit contrasting light emission properties compared to the blue-emitting Cu(I) analogues. Thus, (NH₄)₂AgBr₃ and (NH₄)₂AgI₃ exhibit broadband whitish light emission at room temperature with PL maxima at 394 and 534 nm and full width at half-maximum values of 142 and 114 nm, respectively. Based on our combined experimental and computational results, the broadband emission in (NH₄)₂AgX₃ is attributed to the presence of high-stability self-trapped excitons and defect-bound excitons. (NH₄)₂AgBr₃ and (NH₄)₂AgI₃ both have significantly improved air and moisture stability as compared to the related copper(I) halides, which are prone to degradation via oxidation. Our results suggest that silver halides should be considered alongside their copper analogues for high-efficiency light emission applications.

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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); National Aeronautics and Space Administration (NASA); National Science Foundation (MSF)

Grant/Contract Number:: AC05-00OR22725; 80NSSC19M0140; CHE-1726630; AC02-05CH11231

OSTI ID:: 1797547

Alternate ID(s):: OSTI ID: 1818640; OSTI ID: 1819270

Journal Information:: ACS Materials Au, Journal Name: ACS Materials Au Vol. 1 Journal Issue: 1; ISSN 2694-2461

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: (NH 4 ) 2 AgX 3 (X = Br, I): 1D Silver Halides with Broadband White Light Emission and Improved Stability

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Title: (NH ₄ ) ₂ AgX ₃ (X = Br, I): 1D Silver Halides with Broadband White Light Emission and Improved Stability