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以COB形式封装的白光LED平面光源为研究对象,系统研究了平面封装结构中荧光层对白光LED平面光源发光特性的影响。采用丝网印刷法制备了不同浓度与印刷层数的荧光层,并采用平面封装的LED蓝光光源作为激发光源,以类比法研究分析了不同发光层膜厚对白光平面光源平均照度、色坐标和光通量等参数的影响,系统地阐述了发光层对平面光源发光性能的决定因素及工艺优化条件。结果表明,当荧光粉浆料浓度为46%~53.6%,厚度为20~38μm时,结合平面蓝光LED激发可以获得照度大、颜色纯正的白光LED光源,且白光LED平面光源具有较高的光通量值,表现出优良的光学特性。
The white LED planar light source encapsulated by COB is taken as the research object and the influence of the phosphor layer on the luminescent properties of white LED planar light source is studied systematically. Fluorescent layers with different concentrations and printing layers were prepared by screen printing method. The LED blue light source with planar package was used as the excitation light source, and the average illuminance, color coordinates Luminous flux and other parameters of the system, a systematic exposition of the luminescent layer on the planar light source luminescent properties of the determinants and process optimization conditions. The results show that when the phosphor slurry concentration is 46% -53.6% and the thickness is 20 ~ 38μm, white LED light source with large illumination and pure color can be obtained by the combination of planar blue LED excitation, and the white light LED planar light source has higher luminous flux Value, showing excellent optical properties.