Journal
CHEMISTRY OF MATERIALS
Volume 32, Issue 15, Pages 6640-6649Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.0c02062
Keywords
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Funding
- National Science Foundation [CER 1911311]
- Welch Foundation [E-1981]
- U.S. Department of Energy (DOE) Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
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Perovskites are a class of materials with applications in photovoltaics, solid-state lighting, and catalysis. Extensive research has gone into modifying the chemical composition of these distortion-prone structures to manipulate and achieve their tremendous physical properties. Here, we report a BaScO2F perovskite that, when doped with Eu2+, produces a highly efficient cyan emission stemming from the structure's high symmetry and dense connectivity. However, the emission peak is broader than expected and steady-state, temperature-dependent, and time-resolved photoluminescence spectroscopy reveals the presence of two distinct emission peaks despite a single rare-earth substitution site. Ab initio calculations subsequently prove that substituting the smaller Eu-2(+) induces an unexpected local structure distortion driven by zone-boundary octahedral tilting. This produces two different local coordination environments around Eu-2(+) that cause the dual emission. This work shows the critical need to analyze local distortions in phosphors upon rare-earth substitution, especially in perovskites on the verge of structural instabilities.
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