Abstract
In this Letter, we report the addition of and in , phosphor for improving the performances of white light-emitting diodes (LEDs). The additional trivalent will occupy the site in this host like the situation of , its concentration can be enhanced by the addition of in site due to the substitution of for can compensate the charge mismatch between and . Based on the efficient and energy transfers (ETs) and the compensation effect of , the additional in our present phosphors exhibits an intense red-emission around 610 nm, which is significant for enhancing the color rendering property. In addition, we also find that the additional in site can markedly adjust the photoluminescence (PL) spectrum shape of our phosphor by controlling the distribution of at and sites. A new tunable full-color emission is obtained via the ETs (, and ) and the adjusting effect of in our present phosphors. Finally, a white LED with higher color rendering index of 90, lower correlated color temperature of 4980 K, and chromaticity coordinates of (0.34, 0.31) was obtained by combining the single , , , phosphor with a blue-emitting InGaN LED chip.
© 2014 Optical Society of America
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