LAUSR

Abstract The warm white light with high color-rendering index is the key characteristic of the ideal solid state illumination source, and a single-component full-color phosphor with an ultraviolet chip may achieve this goal. However, divalent Eu2+ and Mn2+ are unstable in some hosts such as LaAl2.03B4O10.54 which limits the design of single-phase panchromatic phosphors. Herein, we adopt a co-substitution strategy to stabilize Eu2+ and Mn2+ incorporated into the host LaAl2.03B4O10.54. The crystal structure and fluorescence spectra of phosphors were investigated in detail. In Eu2+/Eu3+, Mn2+ co-doped phosphors, the efficiency and mode of energy transfer from Eu2+ to Mn2+ were fully discussed. As the Tb3+ ions doping concentration is greater than 0.04 mol. % in Eu2+/Eu3+, Mn2+, Ce3+, Tb3+ quadruple-doped LaAl2.03B4O10.54 phosphors, the color coordinates of all samples fall into the white light region. The correlated color temperature gradually decreased with increasing the doping concentration of Tb3+ ions. The panchromatic white light emitting with high color-rendering index (CCT = 6958 K, Ra = 83.9) has been achieved as expected in La0.28Sr0.4Si0.5Al1.53B4O10.54: 0.02Eu2+/Eu3+, 0.08Mn2+, 0.06Ce3+, 0.16 Tb3+ phosphor upon excitation at 270 nm. The results indicate that the obtained phosphors might be promising materials to apply in UV-based w-LEDs.