백색 발광다이오드용 M-Si(Al)-O-N (M: Sr, Ca) 형광체의 합성 및 발광 특성
Synthesis and Optical Properties of M-Si(Al)-O-N (M: Sr, Ca) Phosphors for white Light Emitting Diodes
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참고문헌
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초록
백색 LED용 산질화물계 녹색발광 형광체를 합성하고, 광특성을 분석하였다. SrSi2O2-δN2+2/3δ:Eu2+의 조성을갖는 SrSi2O2N2:Eu2+ 경우 합성조건에 따라서 N/O비 (δ)가 변하고 있었다. 수소 분위기로 1700oC에서 합성된 시편이 Eu 의 농도가 5 mol%일 때 Eu2+의 5d→4f 전이에 의한 545 nm 근처에서의 가장 높은 녹색 발광강도를 얻을 수 있었다. Ca0.5m-0.005Yb0.005Si12-(m+n)Alm+nOnN16-n의 조성을 갖는 Ca-α-SiAlON:Yb2+는 m = 3 (n = 0.15)에서 잘 발달된 결정성과 균일한 크기를 갖는 입자를 얻을 수 있었고, 이 것이 550 nm 근처에서 가장 높은 녹색 발광을 하고 있었다.
Abstract
Oxynitride green phosphors for white light emitting diodes (LEDs) were synthesized and their optical properties were evaluated. The N/O ratio (δ) of SrSi2O2-δN2+2/3δ:Eu2+ closely depended on the synthesizing conditions. The most excellent green emission (545 nm), which was assigned to the 5d→4f transition of Eu2+ ions, was achieved at the conditions of 1700oC, 5 mol% Eu2+, and H2 atmosphere. The well-developed Ca-α-SiAlON:Yb2+ particles with homogeneous size were obtained at m = 3 (n = 0.15) for the compound of Ca0.5m-0.005Yb0.005Si12-(m+n)Alm+nOnN16-n, resulting in the strong green emission at around 550 nm.
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