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- W4387432842 abstract "Encapsulating photoluminescent lanthanide ions like erbium (Er) into fullerene cage affords photoluminescent endohedral metallofullerenes (EMFs). Few reported photoluminescent Er-EMFs are all based on encapsulation of multiple (two to three) metal atoms, whereas mono-Er-EMFs exemplified by Er@C82 are not photoluminescent due to its narrow optical bandgap. Herein, by entrapping Er-cyanide cluster into various C82 cages to form novel Er-monometallic cyanide clusterfullerenes (CYCFs) ErCN@C82 (C2 (5), Cs (6) and C2v (9)), we investigate the photoluminescent properties of CYCF for the first time, and observe obvious near-infrared (NIR) photoluminescence only for ErCN@C2 (5)-C82 . Combined with a comparative photoluminescence study of three medium-bandgap di-Er-EMFs, including Er2 @Cs (6)-C82 , Er2 O@Cs (6)-C82 , Er2 C2 @Cs (6)-C82 , we propose that the optical bandgap can be used as a simple criterion for switching the photoluminescence of Er-EMFs, and the bandgap threshold is determined to be between 0.83 ∼ 0.74 eV. Furthermore, the photoluminescent patterns of these three di-Er-EMFs differ dramatically. We find that the location of the Er atom within the same Cs (6)-C82 cage is almost fixed and independent on the endo-unit, thus the previous statement on the key role of metal position in photoluminescence of di-Er-EMFs seems erroneous, and the geometric configuration of the endo-unit especially the bridging mode of two Er ions is decisive instead. This article is protected by copyright. All rights reserved." @default.
- W4387432842 created "2023-10-09" @default.
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- W4387432842 date "2023-10-08" @default.
- W4387432842 modified "2023-10-10" @default.
- W4387432842 title "Bandgap Engineering of Erbium‐Metallofullerenes Toward Switchable Photoluminescence" @default.
- W4387432842 doi "https://doi.org/10.1002/adma.202304121" @default.
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