摘要
以聚碳酸酯（PC）粉体、有机硅光扩散剂和YAG∶Ce荧光粉为原料,通过熔融共混法和高温压模法及减薄抛光工艺制备出不同有机硅光扩散剂质量分数的PC/YAG∶Ce光散射荧光树脂样品,通过SEM、XRD、透射光谱和PL的性能分析,表明：荧光树脂样品在500~800nm光谱范围有较高的透光率,样品的主相都为Y3Al5O12,在342和448nm有两个激发波峰,发射光谱在532nm有一宽峰,属于Ce3＋的5d→4f特征跃迁发射,对应的荧光寿命在61.5ns左右。把荧光树脂样品应用到白光LED器件的封装获得的光效为81.12lm/W@100mA,说明PC/YAG∶Ce荧光树脂片适用于作白光LED封装的新型荧光材料。
With the methods of compound-melting and high-temperature molding,PC/YAG∶Ce fluorescent resin pieces were prepared.The transmittance of the prepared PC/YAG∶Ce fluorescent resin in 500~800nm reaches approximately 65%（0.71 mm thick,double sides polished）.The fluorescent resin was characterized by XRD,SEM and PL.The X-ray diffraction（XRD）patterns demonstrated that the fluorescent resin was pure Y3Al5O12 phase.The scanning electron microscopy（SEM）images showed that YAG phosphor was distributed evenly in the fluorescent resin.The excitation spectra had a weak peak at 342 nm and a strong band at 448 nm.The broad emission peaks at about 532 nm can be attributed to 5d→4ftransition of Ce3＋ions.Decay curves for the fluorescence of PC/YAG∶Ce fluorescent resin show that the lifetime of the fluorescent resin was 61.5ns.The luminous efficacy of the white LED packaged by the fluorescent resin and blue LED chip was 81.12lm·W-1 at 100 mA.All results above of PC/YAG∶Ce fluorescent resin indicate a promising fluorescent material for white LEDs.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2014年第12期3178-3182,共5页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金重点项目(61176043)
广东省战略性新兴产业专项资金LED产业项目(2010A081002005
2011A081301003
2012A080304016)
华南师范大学青年教师培养基金(2012kj018)
华南师范大学研究生科研创新基金项目(2012kyjj223)资助
