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Photocatalytic and Thermometric Characteristics of Er 3+ ‐Activated Bi 5 IO 7 Upconverting Microparticles
Author(s) -
Luo Laihui,
Ran Weiguang,
Du Peng,
Li Weiping,
Wang Dandan
Publication year - 2020
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201902208
Subject(s) - materials science , photon upconversion , bifunctional , photocatalysis , doping , fluorescence , irradiation , visible spectrum , ion , luminescence , analytical chemistry (journal) , photochemistry , optoelectronics , optics , catalysis , organic chemistry , chemistry , physics , nuclear physics
Series of Er 3+ ‐activated Bi 5 IO 7 upconverting microparticles are prepared by using a wet chemical technology along with a dedicated heating process. The electronic structure of the Bi 5 IO 7 host is systematically studied by employing the first‐principle density functional theory. The near‐infrared (NIR) triggered upconversion (UC) behaviors of the prepared samples are studied and the optimal doping content for Er 3+ ions is determined to be 7 mol%. The involved luminescent mechanism is verified by the pump power dependent UC emission spectra. Through the fluorescence intensity rate route based on the 2 H 11/2 and 4 S 3/2 thermally coupled levels, the thermometric properties of the final compounds are investigated in detail. The maximum absolute and relative sensor sensitivities of the resultant microparticles are 0.0069 K ‐1 and 1.36% K ‐1 , respectively, importantly, these values are independent on the Er 3+ ion content. The photocatalytic activity of the resultant microparticles are evaluated by analyzing the degradation of RhB under the irradiation of visible and NIR light. The results demonstrate that the Er 3+ ‐activated Bi 5 IO 7 microparticles are promising bifunctional platforms for optical thermometers and visible‐NIR light triggered photocatalysis.