Synthesis and luminescent properties of LiLaSiO4:Dy3+, Eu3+ phosphors for white LEDs

A range of LiLaSiO4:xDy(3+), yEu(3+) phosphors were synthesized by high-temperature solid-phase method. Its phase composition, microstructure, luminescence properties, energy transfer mechanism, decay life and CIE color coordinates of the samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and fluorescence spectrometer. In LiLaSiO4:xDy(3+) phosphors, as the doping concentration of Dy3+ increases, the luminescence intensity of Dy(3+)increases first and then decreases, the concentration quenching point of Dy(3+)was x = 0.04. In LiLaSiO4: 0.04Dy(3+), yEu(3+) phosphors, as the doping concentration of Eu3+ increase, the luminescence intensity of Dy(3+)decreases gradually. However, the luminescence intensity of Eu3+ increases first and then decreases, the concentration quenching point of Eu3+ was y = 0.05. In LiLaSiO4:0.04Dy(3+), yEu(3+) phosphors, there is energy transfer between Dy3+- Eu3+. When the concentration of Eu3+ was y = 0.20, the energy transfer efficiency is 62.50%, The energy transfer mechanism of electric dipole-electric dipole LiLaSiO4:xDy(3+), yEu(3+) phosphor. By tuning the doping concentration percentage of Eu3+ and Dy3+, the LiLaSiO4:xDy(3+), yEu(3+) phosphors can realize the lighting by single-matrix warm white light-emitting diodes (WLEDs).

Automated summary

A series of LiLaSiO4:xDy(3+), yEu(3+) phosphors were synthesized by high-temperature solid-phase method, and their properties were analyzed using various techniques. It was found that the luminescence intensity of Dy3+ and Eu3+ in the phosphors was affected by the doping concentration, with energy transfer observed between Dy3+ and Eu3+. By adjusting the doping concentration percentage of Eu3+ and Dy3+, the phosphors can achieve lighting with warm white light-emitting diodes.