Effects of flux on the synthesis of YAG：Ce powder

• Main Authors: Kuo,Che-Wei, 郭哲瑋
• Other Authors: Tsai, Ming-Shyong
• Format: Others
• Language: zh-TW
• Published: 102
• Online Access: http://ndltd.ncl.edu.tw/handle/60214078648095479635

碩士 === 南台科技大學 === 化學工程與材枓工程系 === 101 === In recent years, white light emitting diode (WLED) with many advantages, such as low energy consumption, long life, small size and non-mercury pollution, which gradually substituted traditional light sources because the awareness of energy saving and environmental protection was developed. Up to now, there have been various manufacturing methods of WLED were reported, among which a popular one was the combination of InGaN blue chip and yellow phosphor (YAG：Ce). In this research, cerium doped yttrium aluminum garnet phosphor were prepared by solid-state reaction method with adding fluoride salts as flux. The XRD patterns shown the powder with 20 mol% flux A was presented pure YAG phase at 1000℃ for 1 hour. Form the photoluminescence (PL) spectrum, it shown that luminescence intensity of YAG：Ce with 20 mol% flux B, which calcined at 1500℃ for 5 hours was better than others. From the SEM images, the powder with 20% flux had regular morphology and non-aggregation characteristic. The particle size of YAG：Ce powder were about 1.6 μm and 2.5 μm, respectively. In summary, YAG：Ce powder were synthesized by solid-state reaction method with flux, which could decrease the calcination temperature, make the particle size grow up and near spheric as well as enhance luminescence intensity. In addition, the luminescence intensity of YAG：Ce powder were affected not only by pure YAG phase, but also by the morphology and particle size of YAG：Ce powder.