Date
Place
- Room H (Room Hall 1, 1F)
- P1. Poster Session I
- August 20, 2015 (Thursday)
- 14:00 ~ 15:30
- [P1-114]
- 14:00 ~ 15:30
- Title:Development of a ¡°Sedimentation-Free¡± Phosphor for LED Color Bin Yield Enhancement
- Shih-Yi Wen, Tung-Yun Liu, and Chen-Peng Hsu (ITRI, Taiwan)
Abstract: In this paper, we present a ¡°sedimentation-free¡± phosphor for LED color bin yield enhancement. The conventional phosphor-conversion white LED is fabricated by dispensing silicone gel mixing with yellow phosphor into the blue LED package. Due to density difference of phosphor and silicone, phosphor particles will settle and lead to non-uniform phosphor distribution in the package and between packages. This phenomenon affects the color coordinate of white light LED during the dispensing process. The concept of sedimentation-free phosphor is to transform the density of phosphor (4.5~5.5g/cc) close to the density of silicone (~1g/cc) by bonding the hollow sphere (0.46~0.6g/cc). The bonding process is carried out by the sol-gel hydrolysis condensation process. We have demonstrated equivalent density of the sedimentation-free phosphor could be controlled within 1¡¾0.2g/cc. In addition, the LED color bin yield experiments are performed by dispensing silicone gels with conventional and sedimentation-free phosphor into PLCC-5630 LED packages. Results show color bin yield could be improved to 89% in 4X-SDCM (every ellipse means 1X-SDCM) within 3 hours by using the sedimentation-free phosphor.
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