Abstract
High-purity ultrafine MgAl2O4 powder was synthesized by metal-alkoxide method and calcining for 2～4 h.After mixing the YAG∶Ce phosphor with MgAl2O4 powder,MgAl2O4/Ce∶YAG transparent ceramics were obtained by hot-pressed sintering and hot isostatic pressed sintering technique.The transparent ceramics were characterized by X-ray diffraction and UV-Vis spectrometer.The crystal phase of the transparent ceramic was composed of MgAl2O4 and YAG.The excitation spectra had a weak band at 345 nm and a strong band at 475 nm.The broad emission peaks at about 533 nm can be attributed to 5d→4f transition of Ce3+ ions.The luminous efficacy of the white LED which packaged by the transparent ceramic and blue LED chip was 133.47 lm·W-1 at 35 mA,and its color temperature are not varied with the change of driving current.It had better performance in stability and lifetime than that packaged in traditional ways under the same condition.All results show that MgAl2O4/Ce∶YAG transparent ceramic may be a promising fluorescent material for white LEDs.
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