Tm3+?Tb3+energy transfer induced color-tunable in double-doped LiLaSiO4 phosphors

In this paper, a series of color-tunable LiLaSiO4:?Tm3+, ?Tb3+ phosphors were quickly synthesized by microwave-assisted solid-phase reaction method. Under proper ultraviolet light excitation, Tm3+ ions produce 1D2?3F4 energy level transition and emit blue light, and the concentration quenching point is ? = 1.5%mol. The color coordinates are (0.139, 0.046), compared with commercial blue phosphors. It has a higher color purity and color saturation. The Tb3+ ions produce 5D4?7F5 energy level transition and emit green light, and the color coordinate is (0.324, 0.508). In Tm3+-Tb3+ double-doped LiLaSiO4 phosphors, the concentration quenching point of Tb3+ ions is ? = 6%mol. By characterizing the fluorescence lifetime and the luminous intensity of the Tm3+-Tb3+ co-doped LiLaSiO4 phosphor, it is verified that there is an energy transfer of Tm3+?Tb3+ in the phosphor. The energy transfer efficiency and energy transfer mechanism have been investigated in detail. From the researched luminous properties, it is found that Tm3+-Tb3+ co-doped LiLaSiO4 phosphor is an ideal material for light-emitting diodes, luminescent materials and fluorescent display devices.

Automated summary

Color-tunable LiLaSiO4 phosphors containing Tm3+ and Tb3+ ions were synthesized using a microwave-assisted solid-phase reaction method in this study. The Tm3+ ions emit blue light and their concentration quenching point is 1.5%mol, while the Tb3+ ions emit green light and their concentration quenching point is 6%mol in the Tm3+-Tb3+ co-doped LiLaSiO4 phosphors. Energy transfer from Tm3+ to Tb3+ was verified in the phosphor, making it an ideal material for LED and luminescent devices.