| 학회 | 한국재료학회 |
| 학술대회 | 2013년 가을 (11/06 ~ 11/08, 제주롯데호텔) |
| 권호 | 19권 2호 |
| 발표분야 | F. 광기능/디스플레이 재료(Optical Functional and Display Materials) |
| 제목 | The photoluminescence properties of Y2Si3O3N4:Ce3+ phosphors under UV excitation |
| 초록 | Light-emitting diodes (LEDs) have been attracted much attention due to their advantages such as long lifetime, inexpensive production, high efficiency, low energy comsumption, and high materials stability. Phosphors are the key factor in white LEDs, and generally, the photoluminescence properties such as brightness and color rendering index strongly depend on the quality of phosphors. Therefore, searching new phosphors with great luminescent properties are essential. In recent years, many studies have been focused on oxynitride materials because of their potential application in WLEDs. Oxynitride materials are known as good candidates for host lattices for luminescent materials due to their great optical properties upon UV excitation. Also, oxynitride materials show high chemical and physical stability. In this study, the Ce3+-doped Y2Si3O3N4 phosphors were successively synthesized by solid-state method and photoluminescence properties under UV excitation were investigated. Y2Si3O3N4 is a melilite-type compound and the unit cell is trigonal. The Y atom is eightfold coordinated by O and N. The Y2Si3O3N4:Ce3+ phosphors were synthesized using Y2O3, Si3N4, Sc2O3, CaCO3, Li2CO3, NH4Cl and CeO2 as raw materials by firing under oxidative atmosphere at 600°C followed by reduction at 1600°C. The prepared Y2Si3O3N4:Ce3+ phosphors exhibited broad emission spectrum in the range of 430 to 700 nm, centered at 494nm under UV excitation, based on the 5d-4f transition of Ce3+. The luminance of Y2Si3O3N4:Ce3+ phosphors were increased by doping Sc3+ and Ca2+ ions on Y3+ sites. The content of Sc3+ and Ca2+ ions were optimized as 0.1 and 1 mol%, respectively. Also, thermal stability of Y2Si3O3N4:Ce3+ phosphors were improved by doping Ca2+ ions on Y3+ sites. |
| 저자 | Mihye Wu, Sungho Choi, Ha-Kyun Jung |
| 소속 | Korea Research Institute of Chemical Technology |
| 키워드 | oxynitride; phosphors |
