Luminescence Characteristics of Dy~(3+) Activated LiCaBO_3 Phosphor

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).