| 학회 | 한국재료학회 |
| 학술대회 | 2015년 가을 (11/25 ~ 11/27, 부산 해운대그랜드호텔) |
| 권호 | 21권 2호 |
| 발표분야 | F. 광기능/디스플레이 재료 |
| 제목 | Luminescent Properties of Lu3Al5O12:Ce3+ Green Phosphors on Fluxing Agents Addition |
| 초록 | Since combining blue LED chip with YAG:Ce yellow phosphor is disadvantageous in warm-white generation due to a low color rendering index, developing green phosphors is necessary. Particularly, cerium-doped lutetium aluminum garnet (Lu3Al5O12:Ce3+, LuAG:Ce), the isostructure of the YAG:Ce, is known as a promising green emitting phosphor for the high-power LEDs. Controlling particle size and morphology of the phosphors can provide excellent thermal stability and optical performances, which make it applicable to high-power LEDs. In this study, the LuAG:Ce green phosphors were synthesized via a solid-state reaction with various fluxing agents such as AlF3, BaF2, CaF2, MgF2 and H3BO3. The morphological alterations and the luminescent properties of LuAG:Ce phosphors in accordance with these fluxing agents and their content were investigated. The most effective fluxing agent for high luminance and particle growth was AlF3 and H3BO3, respectively. The optimum content of H3BO3 for the particle growth was 10 wt%. Meanwhile, the pre-annealing temperature of the raw material Al2O3 has a great effect on particle morphology. With varying pre-annealing temperature as 600 and 1550oC, the resultant particles showed different particle morphlogies, and the results exhibited that pre-annealing of 600oC is effective in obtaining spherical LuAG:Ce particles. The obtained LuAG:Ce phosphors exhibited green emission spectra under 451nm excitation in the wavelength range of 470 to 690nm, peaked at 512 nm, due to the 5d-4f transition of Ce3+. |
| 저자 | 정하균1, 심광보2, 최성호1, 우미혜1, 석동일1 |
| 소속 | 1한국화학(연), 2한양대 |
| 키워드 | Lu<SUB>3</SUB>Al<SUB>5</SUB>O<SUB>12</SUB>:Ce<SUP>3+</SUP>; Green Phosphor |
