高分子荧光复合材料的制备及光学性能测试研究

Study on Preparation and Optical Properties of Fluorescent Polymer Composite Materials

高分子荧光复合材料作为一种白光LED器件用光致发光材料,其光学性能的优劣直接影响到器件的性能参数。采用聚碳酸酯粉体、荧光材料、光扩散材料为原料,利用高温熔融-热压的方法制备高分子荧光复合材料,通过荧光分光光度计、荧光光谱仪对不同厚度条件下材料的发射强度、蓝绿光吸收、器件参数、荧光转换效率及不同驱动电流下的热学特性进行了测试分析和计算,研究结果表明:荧光复合材料的厚度与发射强度、荧光转换效率成反比,与蓝绿光透射率成正比;当荧光复合材料厚度为0.3mm时,所制备器件的光通量达到最高值363.8lm(@3.5 W/200mA),是一种适合实际应用的复合材料,随着驱动电流的从额定200mA增加到400mA,会导致LED的色温从5 408K漂移到5 606K,虽然光通量增加,但是光效由于非辐射复合几率增加和温度的升高逐渐降低,超额电流的应用会降低材料的可靠性和使用寿命,本文所研究的内容对于实际开发应用具有一定的参考意义。

Fluorescent polymer composite material is one kind of photoluminescence material used in WLED, its optical per formance directly affects the performance parameters of the device. In this paper, polycarbonate powder, fluorescent material, light diffusing material were used as raw materials, polymeric fluorescent composite materials was prepared by using high tem- perature melting and hot pressing method. The emission intensity of materials of different thickness under visible light absorp- tion, fluorescence conversion efficiency and device parameters were analyzed and calculated, by using fluorescence spectropho- tometer and fluorescence spectrometer, The results show that the thickness of composite materials is inversely proportional to the fluorescence emission intensity and fluorescence conversion efficiency, proportional to the visible light transmittance. When the thickness of the fluorescent composite material is 0.3 mm, the and it is light flux reaches of prepared device the highest value of 363.81 m （at 3.5 W/200 mA）, therefore, fluorescent polymer composite material is a kind of composite material which is suitable for practical application. With the drive current increases from the rated 200 mA to 400 mA, corresponding CCT chan- ges from 5 408 K to 5 606 K. Although the luminous flux increases, the luminous efficacy gradually decreases due to non radia tive recombination and temperature increasing. Excess current application will reduce material reliability and life. The research content of this paper has certain reference value for the practical development and application.