研究一种新型隔离封装方式制作的LED平面光源。采用高反射率铝板或导光板制作荧光板，用蓝光芯片条在荧光板侧面激发荧光板中的荧光粉实现白光发射。研究表明，该方法不仅制作工艺简单，而且有助于减少荧光粉对光的散射，提高出光效率，提高出光均匀度。通过蓝光的入射角的变化，这种方式能方便调节荧光粉的吸收截面和出射光谱，实现了95以上的高显色指数，同时真正实现了芯片和荧光粉的远离。%A novel LED plane light source is studied in the paper. With the fluorescence plate manufactured through high-reflection aluminum board and the blue light LED chip strips, white light emission is realized. Theoretic analysis show that the light-output efficiency of the LED sources can be increased through the coincidence of the light-excited surface of the fluorescence layer and the light output surface of the layer; the epoxy coating on phosphor particles can reduce the incident intensity of blue light to the phosphors, while the uncoated phosphor particles have the higher blue-fluorescence converting efficiency. Light output efficiency can also be raised by the high reflectivity of the substrate of fluorescence epoxy layer. With the help of the light guide plate dots, the light output homogeneous of the plane source can be realized. The absorption cross section and the emission spectrum of the plane source can be adjusted through the change of incident angle of blue light, and high color render index above 95 can be obtained. Furthermore, the isolation between LED chips and phosphors is realized. The light efficiency of the plane sources can be further enhanced through the optimization design and manufacture process, and reaches the commercialization.
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