Date
Place
- Room C (Room 323)
- 17. LEDs and Lighting III
- August 19, 2015 (Wednesday)
- 16:00 ~ 17:20
- [17-3]
- 16:50 ~ 17:05
- Title:Color-Tunable Garnet Solid-Solution Phosphor for Cost Reduction
- Yoon Hwa Kim, Bo Young Kim, and Won Bin Im (Chonnam Nat'l Univ., Korea)
Abstract: Most of lamps based upon phosphor downconversion of blue light-emitting dioes (LEDs) use Y3Al5O12:Ce3+ garnet (YAG:Ce3+) phosphors mixed in a silicone resin and then coated on top of a blue LED. Garnet structure (cubic, space group Ia-3d) is recognized as highly stable and efficient host for white LED applications. However, yellow YAG:Ce3+ phosphor are associated with patent infrigement while a replacement of lutetium with ytrrium in the smilar structure Lu3Al5O12:Ce3+ (LuAG:Ce3+) phosphor would raise the cost of the LED device. In this study, we prepared solid solutions between the garnet structure LuAG:Ce3+ and Lu2CaMg2Si3O12:Ce3+ (LCMSO:Ce3+), which yields the phosphor Lu2.95-xCe0.05Al2-2xMg2xAl3-3xSi3xO12. The LCMSO:Ce3+ end-member has been reported to have longer emission wavelength compared to LuAG:Ce3+ phosphor. Solid solutions between LuAG:Ce3+ and LCMSO:Ce3+ give highly efficient (QE > 90 %), highly color-tunable (¥ëem = 521 to 578 nm) phosphors with reduced amount of lutetium that have great potentials for use in white LED lighting.
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