Luminescence properties and energy transfer of Tm3+-Eu3+ double-doped LiLaSiO4 phosphors

A series of LiLaSiO4:yTm(3+), zEu(3+) phosphors were prepared by high-temperature solid-phase reaction. The microstructure, luminescence performance and quantum yield of the phosphors are characterized by XRD, SEM and fluorescence spectrometer. When the monitoring wavelength is 360 nm, LiLaSiO4:yTm(3+) phosphors showed a sharp emission peak at 460 nm, corresponding to the F-7(0) -> D-5(2) energy level transition, and the concentration quenching point of Tm3+ ions was y = 0.015. LiLaSiO4:yTm(3+), zEu(3+) phosphors have emission peaks of Tm3+ ions at 460 nm and Eu3+ ions at 618 nm, respectively. As the molar mass fraction of Eu3+ ions doped increase, the luminous intensity of Tm3+ ions gradually decrease, and the luminous intensity of Eu3+ ions increase first and then decrease, and the concentration quenching point of Eu3+ ions was z = 0.08. The energy transfers of Tm3+ -> Eu3+ ions through electric dipole-electric dipole interactions are demonstrated by the luminous intensity variation law and fluorescence lifetime. By changing the doping ratio of Eu3+ and Tb3+ ions, the full-color control of the phosphor luminescent color from blue to red can be achieved.

Automated summary

A series of LiLaSiO4:yTm(3+), zEu(3+) phosphors were prepared by high-temperature solid-phase reaction. The luminescence performance of these phosphors is influenced by the concentration of Tm3+ and Eu3+ ions, and full-color control from blue to red can be achieved by changing the doping ratio of these ions.