Chi Jim-Yong, Chen Ji-Siao, Liu Chuan-Yu, Chu Cheng-wen, Chiang Kuo-Hsien
Institute of Opto-Electronics Engineering, National Dong Hwa University, Hualien, Taiwan 97401, R.O.C.
Opt Express. 2009 Dec 21;17(26):23530-5. doi: 10.1364/OE.17.023530.
A packaging scheme utilizing omni-directional reflective (ODR) optical coating is described to enhance the light extraction of near UV excited, phosphor-converted LEDs. A simple 1D model was developed to analyze the spectra of the extracted light measured with an integration-sphere as a function of phosphor layer concentration and thickness. Quantitative determination of the absorption coefficients at the pump and fluorescent light wavelength along with the conversion coefficient of phosphors were obtained. The reflection of the ODR film and the back reflector are also characterized. These parameters are then used for efficiency optimization of the present packaging scheme. A maximum enhancement of 40% can be expected with the materials and the configuration used in the present work.
描述了一种利用全向反射（ODR）光学涂层的封装方案，以增强近紫外激发的磷光转换发光二极管（LED）的光提取。开发了一个简单的一维模型，用于分析用积分球测量的提取光光谱作为磷光体层浓度和厚度的函数。获得了泵浦光和荧光波长处吸收系数的定量测定以及磷光体的转换系数。还对ODR薄膜和背反射器的反射特性进行了表征。然后将这些参数用于当前封装方案的效率优化。使用本工作中所用的材料和配置，预计最大增强可达40%。
