Journal
DALTON TRANSACTIONS
Volume 48, Issue 1, Pages 253-265Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8dt03566k
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Funding
- National Natural Science Foundation of China [21471038]
- Special Fund for Scientific and Technological Innovation Strategy of Guangdong Province [2018A030310539]
- Youth Innovation Talent Project of Education Department of Guangdong Province, China [2016KQNCX041]
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In this paper, a new color tunable long persistent phosphor (Ca, Sr)Ga4O7: Mn2+, Bi3+ has been successfully synthesized via a high-temperature solid-state reaction. Crystal field modulation and band gap engineering controlled by Sr2+ substitution for Ca2+ realizes the color tunable Mn2+ emission from 580 to 556 nm. Guided by the tailoring of traps distribution, the long persistence luminescence (LPL) performance of CaGa4O7:Mn2+ is greatly enhanced to 33 times higher brightness and much longer persistent time through Bi3+ co-doping. Furthermore, aided by the Rietveld refinement method, steady/transient-state fluorescence and thermoluminescence (TL) techniques with the combination of DFT calculations, the crystal structure evolution, electronic structure, trap distribution tailoring, self reduction of Mn4+, and the related color tunable Mn2+ photoluminescence/enhanced LPL properties are systematically characterized. Finally, a schematic diagram is proposed for a detailed illustration of the photoluminescence and LPL mechanisms.
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