Abstract

A Dy<sup>3+</sup>-doped LiYF<sub>4</sub> single crystal capable of generating white light by simultaneous blue and yellow light emission of phosphorescent centers is produced. Chromaticity coordinates and photoluminescence intensity vary with excitation wavelength. Under 350, 365, and 388 nm excitation, the crystal shows excellent white light emission. The most efficient wavelength for white light is 388 nm. The CIE coordinates are x=0.316 and y =0.321, and the color temperature (Tc) is 6 368 K. These results indicate that the studied crystal is a potential candidate for ultraviolet light-excited white light-emitting diodes.

© 2013 Chinese Optics Letters

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