Si4+ and Eu3+ co-doped LiZnPO4 phosphors (LZPS:Eu3+) with red luminescence were prepared by high temperature solid-state reaction. The maximum photoluminescence intensity is achieved at the Eu3+ content of 12% (molar concentration). The study also investigated the effect on luminescent properties of LiZnPO4:Eu3+ by the introduction of Si4+ into the host to substitute P5+. The Eu3+ emission intensity at 592 nm and 612 nm is enhanced by 105% and 108%, respectively. Decreasing the amount of Eu3+ significantly reduces the raw material costs. The phosphor is efficiently excited under 395 nm and 254 nm ultraviolet radiation, and is used as the red component in white light-emitting diodes (WLEDs) or fluorescent lamps. The excitation spectra consist of a broad band extending 200–280 nm and a series of sharp peaks extending 310–500 nm, centered at 395 nm, which corresponds to the charge transfer band of O2− → Eu3+ and the f → f transition of Eu3+, respectively. The study applies this distinctly bright phosphor in the detection and imaging of lipid fingermarks on common non-porous and semi-porous substrates such as colored paper, glass, porcelain, and leather, etc. All results indicate that the LZPS:Eu3+ phosphor is an ideal detection powder for background interference reduction due to its high fluorescence brightness which offers high contrast images, which is applicable to the development of fingermarks on the common non-porous and semi-porous substrates.
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This work was financially supported by the 2020 Research Project “Study on photoluminescence properties of rare earth ions doped phosphate phosphor and its application in fingermark development” of Hubei University of Police (HJ2020ZD04).
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Xiong, X., Li, J. Luminescence Properties of Si4+-doped LiZnPO4:Eu3+ and Application in the Development of Latent Fingermarks. Trans. Electr. Electron. Mater. 22, 67–72 (2021). https://doi.org/10.1007/s42341-020-00215-x
- Development of fingermarks