Kai HY, Shang L, Wong KL, Duan CK, Tanner PA. Comment on "Charge Transfer-Triggered Bi
3+ Near-Infrared Emission in Y
2Ti
2O
7 for Dual-Mode Temperature Sensing".
ACS Appl Mater Interfaces 2023;
15:43226-43233. [PMID:
37695948 PMCID:
PMC10772939 DOI:
10.1021/acsami.3c11758]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Accepted: 08/29/2023] [Indexed: 09/13/2023]
Abstract
Undoped Y2Ti2O7 exhibits impurity emission bands at low temperatures due to Mn4+ and Cr3+, as established by codoping with these ions. Contrary to a recent report by Wang et al., ACS Appl. Mater. Interfaces 2022, 14, 36834-36844, we do not observe Bi3+ emission in this codoped host, as also is the case for Fe3+. The emission reported in that paper as being due to Bi3+ in fact corresponds to Cr3+ emission. The Cr3+ and Mn4+ emissions are quenched with increasing temperature, so that Mn4+ emission is scarcely observed above 80 K. We present variable temperature optical data for Y2Ti2O7 and this host codoped with Mn, Cr, Fe, and Bi, as well as a theoretical justification of our results.
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