光散射PC荧光树脂的制备及光学性能

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500～800 nm光谱范围有较高的透光率，样品的主相都为Y₃Al₅O₁₂，在342和448 nm有两个激发波峰，发射光谱在532 nm有一宽峰，属于Ce3+的5d→4f特征跃迁发射，对应的荧光寿命在61.5 ns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81.12 lm/W@100 mA, 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。

Preparation and Luminescent Properties of Light Scattering Fluorescent Resin

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 500～800 nm 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→4f transition of Ce3+ ions. Decay curves for the fluorescence of PC/YAG∶Ce fluorescent resin show that the lifetime of the fluorescent resin was 61.5 ns. The luminous efficacy of the white LED packaged by the fluorescent resin and blue LED chip was 81.12 lm·W-1 at 100 mA. All results above of PC/YAG∶Ce fluorescent resin indicate a promising fluorescent material for white LEDs.