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

Abstract

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.

Authors:
 [1];  [1];  [1];  [1]; ORCiD logo [2]; ORCiD logo [1]
  1. Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
  2. Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Aeronautics and Space Administration (NASA); National Science Foundation (MSF)
OSTI Identifier:
1797547
Alternate Identifier(s):
OSTI ID: 1818640; OSTI ID: 1819270
Grant/Contract Number:  
AC05-00OR22725; 80NSSC19M0140; CHE-1726630; AC02-05CH11231
Resource Type:
Published Article
Journal Name:
ACS Materials Au
Additional Journal Information:
Journal Name: ACS Materials Au Journal Volume: 1 Journal Issue: 1; Journal ID: ISSN 2694-2461
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; photoluminescence; lead-free halides; silver halides; light emission; STE

Citation Formats

Creason, Tielyr D., Fattal, Hadiah, Gilley, Isaiah W., McWhorter, Timothy M., Du, Mao-Hua, and Saparov, Bayram. (NH 4 ) 2 AgX 3 (X = Br, I): 1D Silver Halides with Broadband White Light Emission and Improved Stability. United States: N. p., 2021. Web. doi:10.1021/acsmaterialsau.1c00009.
Creason, Tielyr D., Fattal, Hadiah, Gilley, Isaiah W., McWhorter, Timothy M., Du, Mao-Hua, & Saparov, Bayram. (NH 4 ) 2 AgX 3 (X = Br, I): 1D Silver Halides with Broadband White Light Emission and Improved Stability. United States. https://doi.org/10.1021/acsmaterialsau.1c00009
Creason, Tielyr D., Fattal, Hadiah, Gilley, Isaiah W., McWhorter, Timothy M., Du, Mao-Hua, and Saparov, Bayram. Thu . "(NH 4 ) 2 AgX 3 (X = Br, I): 1D Silver Halides with Broadband White Light Emission and Improved Stability". United States. https://doi.org/10.1021/acsmaterialsau.1c00009.
@article{osti_1797547,
title = {(NH 4 ) 2 AgX 3 (X = Br, I): 1D Silver Halides with Broadband White Light Emission and Improved Stability},
author = {Creason, Tielyr D. and Fattal, Hadiah and Gilley, Isaiah W. and McWhorter, Timothy M. and Du, Mao-Hua and Saparov, Bayram},
abstractNote = {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.},
doi = {10.1021/acsmaterialsau.1c00009},
journal = {ACS Materials Au},
number = 1,
volume = 1,
place = {United States},
year = {Thu Jun 17 00:00:00 EDT 2021},
month = {Thu Jun 17 00:00:00 EDT 2021}
}

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