Zhuo Ningze, Zhang Na, Jiang Teng, Chen Peng, Wang Haibo
School of Electronic Science and Engineering, Nanjing University Nanjing 210093 China
Institute of Optoelectronic Materials of Light Industry Nanjing 210015 China
RSC Adv. 2019 Sep 2;9(47):27424-27431. doi: 10.1039/c9ra05503g. eCollection 2019 Aug 29.
Green phosphor thin films with different silica resin/phosphor mass ratios and phosphor particle sizes were prepared by the hot pressing method. A 405 nm near-ultraviolet light-emitting diode (LED) chip was used to package the laminated white LED (WLED), and the correlated color temperature, luminous efficiency of radiation, light color uniformity, and color coordinate of the laminated WLED were obtained. An increase in the mass ratio and decrease in particle size can effectively affect the scattering coefficient of phosphor photons and the efficiency of the absorption-excitation-emission process, increasing the efficiency and light color uniformity of phosphor thin films and laminated WLEDs. By comprehensive evaluation of various light color parameters, a laminate was prepared with a mass ratio of silica resin/phosphor = 6 : 0.75, and the optimum value of the WLED was obtained. According to the IES TM30 standard, its reached 92, reached 101, and and color distortion icons showed increased saturation for green color. Its luminous efficiency of radiation value of 270.21 lm W, correlated color temperature of 4423 K, and neutral white characteristics indicate that it is a device suitable for lighting applications.
采用热压法制备了具有不同硅树脂/荧光粉质量比和荧光粉粒径的绿色荧光粉薄膜。使用405 nm近紫外发光二极管（LED）芯片对层压白光发光二极管（WLED）进行封装，并获得了层压WLED的相关色温、辐射发光效率、光色均匀性和色坐标。质量比的增加和粒径的减小可有效影响荧光粉光子的散射系数以及吸收-激发-发射过程的效率，提高荧光粉薄膜和层压WLED的效率和光色均匀性。通过对各种光色参数的综合评估，制备了硅树脂/荧光粉质量比为6∶0.75的层压材料，并获得了WLED的最佳值。根据IES TM30标准，其Rf达到92，Rg达到101，且颜色失真图标显示绿色饱和度增加。其辐射发光效率值为270.21 lm/W，相关色温为4423 K，具有中性白色特性，表明它是一种适用于照明应用的器件。
