LED용 Sr-Y-Si-계 산질화물 황색 형광체의 발광 특성
Luminescence properties of novel Sr-Y-Si-Oxynitride yellow phosphor for LED applications
2
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
고상반응법으로 Ba-Y-Si-계 산질화물 황색 형광체를 합성하였고, 형광체의 발광특성에 미치는 고상반응온도, 환원 열처리 온도 및 Eu2+ 활성제 농도의 영향에 대하여 조사하였다. 고상반응온도 1400oC, 환원 열처리 온도 1300oC가 최적화된 온도조건으로 조사되었다. 450 nm 파장의 여기 광원에 대하여 합성된 Ba9Y2 + ySi6O24 − 3yN3y: Eu2+ 형광체는 571~585 nm 영역의 중심파장을 갖는 단일 발광밴드 특성을 나타내었다. 활성제 Eu2+ 농도가 3 mol%일 때 가장 강한 발광강도가 얻어졌으며, 5 mol% 이상의 농도에서는 농도소광현상이 관찰되었다. FE-SEM 및 PSA 분석 결과 합성된 형광체는 약 8.2 μm의 평균 입경을 갖는 것으로 확인되었다.
Abstract
Novel Sr-Y-Si-Oxynitride yellow phosphors were synthesized and the effect of calcination temperature, reduction temperature and Eu2+ concentration on their luminescence properties were studied. Optimal temperature conditions were found to be 1400oC and 1300oC for solid-state reaction and reduction, respectively. The synthesized Ba9Y2 + ySi6O24 − 3yN3y : Eu2+phosphors showed a single intense broadband emission in the range of 571~587 nm for 450 nm excitation light source. The highest luminescence intensity was obtained with Eu concentration of 3 mol% and concentration quenching was observed beyond 5 mol%. FE-SEM and PSA showed that the synthesized phosphors consists of particles with an average size of ~8.2 μm.
참고문헌 (14)
- S. Nakamura, "The blue laser diode: GaN based light emitting and lasers", pp.343~ (1987), Springer
- 지순덕, "백색 LED용 청록색 BaSi_2O_2N_2:Eu^(2+) 형광체의 합성 및 응용", 한국재료학회지, 21(5), pp.250~254 (2011), 한국재료학회
- S. Nakamura, "Candela-class high-brightness InGaN", AlGaN double-heterostructure blue-light-emitting diodes, 1994, pp.64, 1687~
- R.J. Xie, "Silicon-based oxynitride and nitride phosphors for white LEDs-A review", Sci. Technol. Adv. Mater, 8, pp.588~ (2007)
- U. Kaufmann, "Single chip white LEDs", Appl. Mater. Sci, 192, pp.246~ (2002)
- D. Jia, "Long persistent light emitting diode", J. Appl. Phys, 100, pp.113125~ (2006)
- J.K. Park, "Application of strontium silicate yellow phosphor for white light-emitting diodes", Appl. Phys. Lett, 84, pp.1647~ (2004)
- J.K. Park, "Embodiment of the warm white-light-emitting diodes by using a Ba2+ codoped Sr3SiO5 : Eu phosphor", Appl. Phys. Lett, 88, pp.043511~ (2006)
- Y.R. Do, "Luminescence properties of potential Sr1 − xCaxGa2S4 : Eu greenand greenish-yellow-emitting phosphors for white LED", J. Electrochem. Soc, 153, pp.142~ (2006)
- N. Hirosaki, "Wavelength-tunable and thermally stable Li-a-SiAlON : Eu2+ oxynitride phosphors for white light-emitting diodes", Appl. Phys. Lett, 89, pp.241103~ (2006)
- N. Hirosaki, "Characterization and properties of green-emitting β-SiAlON : Eu2+ powder phosphors for white light-emitting diodes", Appl. Phys. Lett, 86, pp.211905~ (2005)
- Y.Q. Li, "Luminescence properties of Ce3+-activated alkaline earth silicon nitride M2Si5N8 (M=Ca,Sr,Ba) materials", J. Lumines, 116, pp.107~ (2006)
- R.J. Xie, "Phosphor Handbook", pp.331~ (2007), CRC press
- T. Nakano, "Novel Ba-Sc-Si-oxide and oxynitride phosphors for white LED", J. Lumines, 129, pp.1654~ (2009)