Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 17, Pages 14941-14947Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b03616
Keywords
WO3:Yb3+,Er3+; reversible modulation; upconversion; thermomchromic reaction
Funding
- National Natural Science Foundation of China [51762029, 11674137]
- Applied basic research key program of Yunnan Province
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Reversible luminescence modulation of upconversion phosphors has the potential applications as photoswitches and optical memory and data storage devices. Previously, the photochromic reaction was extensively used for the realization of reversible luminescence modulation. It is very necessary to develop other approaches such as thermomchromic reaction to obtain the reversible upconversion luminescence modulation. In this work, the WO3:Yb3+,Er3+ phosphors with various colors were prepared at various temperatures, exhibiting tunable upconversion luminescence attributed to the formation of oxygen vacancies in the host. Upon heat treatment in the reducing atmosphere or air, the WO3:Yb3+,Er3+ phosphors show a reversible thermomchromic property. The reversible upconversion luminescence modulation of WO3:Yb3+,Er3+ phosphors was observed based on thermomchromic reaction. Additionally, the upconversion luminescence modulation is maintained after several cycles, indicating its excellent stability. The WO3:Yb3+,Er3+ phosphors with reversible upconversion luminescence and excellent reproducibility have potential applications as the photoswitches and optical memory and data storage devices.
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