关键词: 白光LED, LiCaBO₃, Dy³⁺, 发光特性

Abstract: LiCaBO₃∶Dy³⁺ phosphor was synthesized by solid-state method. LiCaBO₃∶Dy³⁺ phosphor shows several bands peaking at 484, 577 and 668nm. Monitoring at 577nm peak, the excitation spectrum has several bands peaking at 331, 368, 397, 433, 462 and 478nm. The emission spectrum and luminescence intensity of LiCaBO₃∶Dy³⁺ phosphor were investigated by varying Dy³⁺ concentration. The result shows that the ratio (Y/B) of yellow emission (577nm) to blue emission (484nm) increases with increasing Dy³⁺ concentration. Moreover, the luminescence intensity firstly increases and then decreases with increasing Dy³⁺ concentration, and reaches the maximum at 3.00mol% Dy³⁺. And the concentration quenching mechanism is the d-d interaction by Dexter theory. The emission intensity of LiCaBO₃∶Dy³⁺ phosphor is enhanced with doping Li⁺, Na⁺ or K⁺. The InGaNbased LiCaBO₃∶Dy³⁺ shows a nice white-emitting, and the CIE chromaticity is (x=0.3001, y=0.3152).

Key words: white LED, LiCaBO₃, Dy³⁺, luminescence characteristics