Journal
CHEMICAL ENGINEERING JOURNAL
Volume 429, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.132333
Keywords
Anti-counterfeiting; Optical storage; Dual-mode luminescence; Reversible modification
Categories
Funding
- National Natural Science Foundation of China [51762029]
- Applied Basic Research Key Program of Yunnan Province [2018FA026]
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The luminescence of rare earth doped phosphors can be modified using photochromism, as demonstrated in the preparation of Bi3+ co-doped CaWO4: Yb3+, Er3+ phosphor. The phosphor exhibits reversible dual-mode luminescence modification, allowing for potential applications in anti-counterfeiting and optical data storage.
Luminescence modification of rare earth ions doped phosphors based on photochromism is beneficial to expand their practical applications. Here, Bi3+ co-doping CaWO4: Yb3+, Er3+ phosphor is prepared. Color of CaWO4: Yb3+, Er3+, Bi3+ phosphor turn black grey upon the 254 nm ultraviolet light irradiation due to Bi3+ co-doping induced formation of the defects. Black grey CaWO4: Yb3+, Er3+, Bi3+ phosphor can recover their color to the primitive state under the stimulation of 473 or 532 nm lasers, exhibiting the double-light induced reversible photochromism. Dual-mode upconversion and downshift luminescence of CaWO4: Yb3+, Er3+, Bi3+ phosphor is reversibly modified based on its photochromism property. Potential applications of CaWO4: Yb3+, Er3+, Bi3+ phosphor are explored. The CaWO4: Yb3+, Er3+, Bi3+ phosphor is formulated into the inks, printed on the flexible substrate by the screen-printing technology. The luminescence color of printed various patterns can be changed based on the dual-mode luminescence modification, which demonstrate that the CaWO4: Yb3+, Er3+, Bi3+ phosphor ink is an ideal multiple anti-counterfeiting agent. The optical information recorded on the binary photochromic dot arrays of CaWO4: Yb3+, Er3+, Bi3+ sheet could be read upon the UV and near infrared light excitation, exhibiting the potential application of CaWO4: Yb3+, Er3+, Bi3+ phosphor as optical data storage medium.
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