Ce,Gd：YAG transparent ceramic was prepared by tape casting and solid state reaction method. Meanwhile, its crystal structure, chemical state and luminous properties were discussed. The prepared samples are identified...Ce,Gd：YAG transparent ceramic was prepared by tape casting and solid state reaction method. Meanwhile, its crystal structure, chemical state and luminous properties were discussed. The prepared samples are identified as pure garnet structure by the XRD results. The valence states of tetravalent and trivalent Ce ions were identified distinctly by X-ray photoelectron spectroscopy. A strong broad band yellow emission was found in photoluminescence（PL） spectra. The quantum yield reached 90.2% at room temperature. When collaborated with a 1.0 mm × 1.0 mm flip-chip, a luminous efficiency（LE） as high as 116.5 lm/W with a correlated color temperature（CCT） of 6627 K at a power dissipation of 1.13 W at 350 m A was demonstrated, indicating that Ce,Gd：YAG transparent ceramics had a promising potential for high power white light-emitting diodes.展开更多
基金Supported by the Major Program for Research on LED of Chinese Academy of Science(KZCC-EW-106)the National Key Research and Development Program of China(2016YFB0701003)the Natural Science Foundation of Fujian Province(2015j01231)
文摘Ce,Gd：YAG transparent ceramic was prepared by tape casting and solid state reaction method. Meanwhile, its crystal structure, chemical state and luminous properties were discussed. The prepared samples are identified as pure garnet structure by the XRD results. The valence states of tetravalent and trivalent Ce ions were identified distinctly by X-ray photoelectron spectroscopy. A strong broad band yellow emission was found in photoluminescence（PL） spectra. The quantum yield reached 90.2% at room temperature. When collaborated with a 1.0 mm × 1.0 mm flip-chip, a luminous efficiency（LE） as high as 116.5 lm/W with a correlated color temperature（CCT） of 6627 K at a power dissipation of 1.13 W at 350 m A was demonstrated, indicating that Ce,Gd：YAG transparent ceramics had a promising potential for high power white light-emitting diodes.
