Luminescent Characteristics of LiSrBO₃:Eu³⁺ Phosphor for White Light Emitting Diode

LiSrBO₃:Eu³⁺ phosphor is synthesized by a high solid-state reaction method, and its luminescent characteristics are investigated. The emission and excitation spectra of LiSrBO₃:Eu³⁺ phosphors exhibit that the phosphors can be effectively excited by near ultraviolet (401nm) and blue (471nm) light, and emit 615nm red light. The effect of Eu³⁺ concentration on the emission spectrum of LiSrBO₃:Eu³⁺ phosphor is studied; the results show that the emission intensity increases with increasing Eu³⁺ concentration, and then decreases because of concentration quenching. It reaches the maximum at 3mol%, and the concentration self-quenching mechanism is the dipole-dipole interaction according to the Dexter theory. Under the conditions of charge compensation Li⁺, Na⁺ or K⁺ incorporated in LiSrBO₃, the luminescent intensities of LiSrBO₃:Eu³⁺ phosphor are enhanced.