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• W4386780376 abstract "Multicolor and multimode luminescence materials have important applications in the field of information security encryption. However, the design and synthesis of multicolor multimode luminescent materials is still a challenge, and only several materials have been reported. In this paper, a series of single doped and double doped Li_1-xK_xNbO₃:Pr³⁺/Er³⁺/Tm³⁺ phosphors are prepared by high temperature solid state method. The structure, morphology, optical properties and thermoluminescence spectra are characterized by XRD, SEM, luminescence spectrometer and self-made heating device. Firstly, the effects of different K⁺ contents on the luminescence and trap distribution of LiNbO₃ materials are studied. The results show that the ionic lattice is distorted when a small amount of K⁺ ions replace Li⁺. With the addition of K⁺, the PLE spectra monitored the emission of 620 nm show that the ratios of the absorption peaks from matrix (200-310 nm) and absorption peaks from the intrinsic transition of Pr³⁺ ions 4f-5d (310-430 nm) change significantly, showing a double-peak characteristic. When the concentration of K⁺ ion is 0.5, the absorption peak from the matrix disappears, which may be due to the phase transition of the matrix lattice caused by excessive K⁺ or the introduction of a large number of defect energy levels in the matrix lattice. Moreover, K⁺ ion doping can regulate the density and distribution of traps. TL curves show that a small amount of K⁺ doping increases the trap density of shallow traps. When a large amount of K⁺ is doped, the phase changes of matrix lattice and the defect density decrease. Secondly, the doping of different luminescent centers (Pr³⁺/Er³⁺/Tm³⁺) in Li_0.9K_0.1NbO₃matrix are studied. The results show that the multi-color luminescence emission in red, blue and green bands and the tunable multi-mode luminescence (up/down conversion luminescence, afterglow luminescence and photo-stimulated luminescence) have been realized by the selective excitation. According to the multi-color and multi-mode characteristics of the phosphors, a butterfly-shaped anti-counterfeiting pattern is designed. Due to the different energy level positions of the luminescence centers, dynamic multicolor photoluminescence is realized by selective excitation at different wavelengths. Based on the up-conversion luminescence characteristics of Er³⁺ and the excellent afterglow characteristics of Pr³⁺ in Li_0.9K_0.1NbO₃ material, the designed anti-counterfeiting pattern shows the dynamic color change and multi-color, multi-mode high-order anti-counterfeiting application." @default.
• W4386780376 created "2023-09-16" @default.
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• W4386780376 date "2023-01-01" @default.
• W4386780376 modified "2023-09-27" @default.
• W4386780376 title "Multicolor and multimode luminescence regulation and anti-counterfeiting application of lanthanide ions doped Li_0.9K_0.1NbO₃ phosphors" @default.
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• W4386780376 doi "https://doi.org/10.7498/aps.72.20230517" @default.
• W4386780376 hasPublicationYear "2023" @default.
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