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- 2014
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Novel (Ba,Sr)-Y-Si-O-N : Eu2+ green and yellow phosphors were prepared by a solid-state reaction method and the effect of calcination temperature, reduction temperature, reduction time and Eu2+ concentration on their luminescence properties were studied.
Firstly, in the case of Ba9Y2Si6O24-yNy : Eu2+ phosphors, optimal temperature conditions were found to be 1400℃ and 1200℃ for solid-state reaction and reduction, respectively. And optimal reduction time was 24 hours. The synthesized Ba9Y2Si6O24-yNy : Eu2+ phosphors showed a single intense broadband green emission in the range of 504-517 nm for 450 nm excitation light source. The highest luminescence intensity was obtained with Eu concentration of 10 mol% and concentration quenching was observed beyond 13 mol%. FE-SEM and PSA showed that the synthesized phosphors consists of particles with an average size of ~7.2 μm.
Secondly, in the case of Sr9Y2Si6O24-yNy : Eu2+ phosphors, optimal temperature conditions were found to be 1400℃ and 1300℃ for solid-state reaction and reduction, respectively. The synthesized Sr9Y2Si6O24-yNy : Eu2+ phosphors showed a single intense broadband yellow emission in the range of 571-585 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.
Thirdly, in the case of (Ba1-xSrx)Y2Si6O24-yNy : Eu2+ phosphors, as Sr content increased, the luminescent efficiency decreased. FWHM also showed the same tendency. Furthermore, the peak wavelength was shifted to longer wavelength region as the Sr content increased due to increase in crystal field due to substitution of Ba2+ ions with Sr2+ ions that have smaller ionic radius.
The experimental results clearly indicate that the (Ba,Sr)-Y-Si-O-N : Eu2+ phosphors have great potentials as the down-conversion green and yellow phosphors for white light emitting diodes (LEDs) utilizing blue LEDs as the primary light source.
Firstly, in the case of Ba9Y2Si6O24-yNy : Eu2+ phosphors, optimal temperature conditions were found to be 1400℃ and 1200℃ for solid-state reaction and reduction, respectively. And optimal reduction time was 24 hours. The synthesized Ba9Y2Si6O24-yNy : Eu2+ phosphors showed a single intense broadband green emission in the range of 504-517 nm for 450 nm excitation light source. The highest luminescence intensity was obtained with Eu concentration of 10 mol% and concentration quenching was observed beyond 13 mol%. FE-SEM and PSA showed that the synthesized phosphors consists of particles with an average size of ~7.2 μm.
Secondly, in the case of Sr9Y2Si6O24-yNy : Eu2+ phosphors, optimal temperature conditions were found to be 1400℃ and 1300℃ for solid-state reaction and reduction, respectively. The synthesized Sr9Y2Si6O24-yNy : Eu2+ phosphors showed a single intense broadband yellow emission in the range of 571-585 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.
Thirdly, in the case of (Ba1-xSrx)Y2Si6O24-yNy : Eu2+ phosphors, as Sr content increased, the luminescent efficiency decreased. FWHM also showed the same tendency. Furthermore, the peak wavelength was shifted to longer wavelength region as the Sr content increased due to increase in crystal field due to substitution of Ba2+ ions with Sr2+ ions that have smaller ionic radius.
The experimental results clearly indicate that the (Ba,Sr)-Y-Si-O-N : Eu2+ phosphors have great potentials as the down-conversion green and yellow phosphors for white light emitting diodes (LEDs) utilizing blue LEDs as the primary light source.
목차
1. 서 론2. 이론적 배경2.1. 형광체2.1.1. 형광체의 정의2.1.2. 형광체의 구성과 요건2.1.3. 형광체의 발광원리2.1.4. 형광체의 발광효율2.2. 백색 조명 LED용 형광체 기술 현황2.3. Alkaline earth silicon-based oxynitride 형광체의 특성2.4. 결정장이론(Crystal field theory)2.5. X-ray 회절분석법(X-ray Diffractometry, XRD)2.6. 형광분광법(Fluorescence spectrometer)2.7. 전계방출 주사전자현미경(Field-Emission Scanning Electron Microscopy, FE-SEM)2.8. 동적광산란법(Dynamic laser scattering, DLS)3. 실험방법3.1. 출발원료 및 형광체의 합성3.1.1. Ba9Y2Si6O24-yNy : Eu2+ 형광체3.1.2. Sr9Y2Si6O24-yNy : Eu2+ 형광체3.1.3. (Ba9-x,Srx)Y2Si6O24-yNy : Eu2+ 형광체3.2. 형광체 특성 분석4. 실험결과 및 고찰4.1. Ba-Y-Si-계 산질화물 형광체 특성4.1.1. 합성 온도의 영향4.1.2. 활성제 농도의 영향4.1.3. 형광체의 형상, 입도크기, 분포4.2. Sr-Y-Si-계 산질화물 형광체 특성4.2.1. 합성 온도의 영향4.2.2. 활성제 농도의 영향4.2.3. 형광체의 형상, 입도크기, 분포4.3. (Ba9-xSrx)-Y-Si-계 산질화물 형광체 특성4.3.1. Sr 이온 첨가량에 따른 형광체의 발광 특성5. 결 론6. 참고문헌7. Abstract
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