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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。
As a kind of photoluminescence material for white LED devices, polymer fluorescent composites directly affect the performance parameters of the device due to its optical properties. Polycarbonate powder, fluorescent material and light-diffusing material were used as raw materials to prepare polymer fluorescent composites by high temperature melting-hot pressing. The emission intensities of materials with different thickness were measured by fluorescence spectrophotometer and fluorescence spectrometer. Green light absorption, device parameters, fluorescence conversion efficiency and thermal characteristics under different driving current were tested and calculated. The results show that the thickness of the fluorescent composite material is inversely proportional to the emission intensity and the fluorescence conversion efficiency, . When the thickness of the fluorescent composite material is 0.3mm, the luminous flux of the prepared device reaches the highest value of 363.8lm (@ 3.5W / 200mA), which is a practical composite material. As the driving current increases from the nominal 200mA To 400mA, will lead to LED color temperature drift from 5 408K to 5 606K, although the luminous flux increases, but the luminous efficiency due to non-radiative recombination increases and the temperature decreases, the application of excess current will reduce the material reliability and service life The content of this paper has certain reference meaning for the actual development and application.