期刊
OPTICAL MATERIALS
卷 35, 期 12, 页码 2155-2159出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2013.05.035
关键词
Al2O3-YAG eutectic; Ce-doped; Photoluminescence; White LED
资金
- Science and Technology Commission of Shanghai Municipality [11DZ1140301]
Ce-doped Al2O3-YAG (Y3Al5O12, yttrium aluminum garnet) eutectic, a resin-free phosphor for white light emitting diodes (WLEDs), was successfully grown by the Czochralski method. X-ray diffraction and scanning electron microscopy show that this material has a typical eutectic structure of interpenetrating sapphire and garnet phases, as well as lamellar spacing in the order of tens of microns. The eutectic has a higher Ce3+ segregation coefficient than YAG single crystal. The photoluminescence properties of this eutectic were also investigated. Results show that it is characterized by a wide excitation band, and that the luminous efficiency of a eutectic-packaged LED is higher than that of a phosphor powder-packaged LED. The findings indicate that the Al2O3-YAG eutectic is a promising phosphor for WLED applications. (C) 2013 Elsevier B.V. All rights reserved.
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