| 학회 | 한국재료학회 |
| 학술대회 | 2011년 봄 (05/26 ~ 05/27, 제주 휘닉스 아일랜드) |
| 권호 | 17권 1호 |
| 발표분야 | F. Display and optic Materials and processing(디스플레이 및 광 재료) |
| 제목 | Pr3+-doped SrAl12O19 phosphors for quantum-cutting emission |
| 초록 | Quantum cutting (QC) emission, which converts vacuum UV to visible emission with quantum efficiency over 100%, is an attractive phenomenon for developing high-performance fluorescent lamps and plasma display panels. The QC emission is often observed in Pr3+-doped host materials of which lowest level of 4f5d band lies above the 1S0 state of 4f2 configuration. Several Pr3+-doped QC phosphors were identified but QC emission from nano-structured hosts is scarcely reported. Strontium hexa-aluminate (SrAl12O19) has a hexagonal magnetoplumbite structure with optical bandgap of 4.4 eV. Since strontium aluminate is chemically very stable, it is considered as a good candidate for host materials for QC phosphors. When SrAl12O19 is doped by Pr3+, strontium site in the SrAl12O19 lattice are substituted. The Pr dopant encounters a weak crystal field. The upper 1S0 state of 4f2 configuration of Pr3+ in weak-crystal filed can lie below the lowest level of 4f5d state, making it possible to exhibit QC emission. The nano-structured SrAl12O19 is particularly interesting since one can expect considerably high quantum efficiency because the smaller particle shows less absorption loss from reflection but has a higher surface area assuring higher absorption and emission. Conventional solid-sate synthesis of SrAl12O19 involves high temperature firing process over 1500°C , which usually results in large particle size. Here, we aim to control SrAl12O19 particle size by using nano-sized AlOOH precursors. Precursors, SrCO3 and AlOOH, were wet-blended by high energy ball milling and fired at relatively low temperature below 1200°C in order to fabricate a nano-structured SrAl12O19 powder. In addition, we doped Pr3+ into the lattice of SrAl12O19 up to 3 mol% and investigated photoluminescent emission of Pr3+-doped SrAl12O19. |
| 저자 | 최형일1, 지현석1, 조소혜1, 정재필2, 박종구1 |
| 소속 | 1한국과학기술(연), 2서울시립대 |
| 키워드 | quantum-cutting; SrAl12O19; phosphor; nanopowder; praseodyumium |
