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Particle Size Effect on the Packaging Performance of YAG:Ce Phosphors in White LEDs |
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| Authors: | Shih Chieh Huang Jui Kung Wu Wei-Jen Hsu Hsin Hsiung Chang Hsien Yen Hung Chi Lian Lin Hung-Yuan Su Nitin Bagkar Wei-Chih Ke Hui Tung Kuo Ru-Shi Liu |
| Affiliation: | Hsiung Din Technologies Corporation, 248-43, Sinsheng Road, L.E.P.Z., Kaohsiung 806, Taiwan; Nanching Optotech Corporation, 888, Ching Kuo Road, Taoyuan 330, Taiwan; Lite-On Technology Corporation, 90, Chien I Road, Taipei 235, Taiwan; Department of Chemistry, National Taiwan University, Taipei 106, Taiwan |
| Abstract: | The synthesis of cerium-doped yttrium aluminum garnet (YAG:Ce) phosphor of different sizes with uniform size distribution was carried out using solid-state reaction followed by grinding and sieving method. The effect of particle size distribution of YAG:Ce phosphors on the photoluminescence (PL) properties was investigated. The results demonstrate that the uniform size distribution and particle size affects the packaging performance in white light emitting diode (LED) applications. The YAG:Ce phosphors with different particle sizes were packaged in white LEDs using different amounts of each phosphors in order to get similar efficiency as that of commercially available YAG:Ce phosphors. It was observed that minimum amount of phosphor material is required for smaller particle size for getting the similar efficiency as that exhibited by commercially available YAG:Ce phosphors. The results are particularly interesting in view of reducing the cost of current LEDs by lowering the amount of phosphors without compromising the efficiencies of final LED package. A systematic study of YAG:Ce phosphors on the packing performance in white LEDs is reported. |
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