Abstract
The Ce:YAG single crystal for white light-emitting diode(WLED) application was grown by the Czochralski method. The thermal stability and optical properties of samples were characterized by absorption spectrum,photoluminescence spectra and temperature-dependent PL spectra. The photoelectric performance of WLEDs fabricated by the Ce:YAG single crystal were also measured. It is found that the Ce:YAG single crystal shows a broad emission band from 500 nm to 700 nm under blue light(wave length 466 nm). Absorption peaks,located at 202,219,247.3,347.4 and 455.5 nm,are due to 4f→5d transition,and the energy of 5d orbits is divided into 21954,29154,40437,45662 and 49505 cm-1. As the temperature increases,the PL intensity is reduced because of a higher energy of the 2F7/2,and the damping upon PL intensity by the Ce:YAG single crystal(13.28%) are much lower than that by commercially available phosphors(30%). When the current is at a standard state and the luminous flux of emission blue light is around 3.7 lm,the most suitable thickness for the Ce:YAG single crystal is 0.5 mm. Since the WLED fabricated by the Ce:YAG single crystal prepared in present work meets all requirements in related GB codes,and its performance is better in comparison with that of the commercially available one,the Ce:YAG single crystal will possibly be used to fabricate new-type WLED devices.
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