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New free-form surface lens simplifies LED packaging process
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A light-emitting diode (Light Emitting Diode) is generally a white light that is excited by a blue light emitted by gallium nitride to be a yellow phosphor which is obtained by mixing blue light and yellow light. Phosphor coating is a key process in LED packaging. The phosphor coating effect determines the optical performance of the final LED, such as light efficiency and spatial color uniformity. Phosphor conformal coating can achieve a uniform thickness of phosphor layer, which can greatly improve the spatial color uniformity of the final light. In order to achieve this ideal phosphor coating method, various LED packaging companies and scientific research institutions have developed a variety of implementation processes.
With the support of the national 973 and 863 projects, the research team of Wuhan Optoelectronics National Laboratory (MOEMS), where Professor Luo Xiaobing and Professor Liu Sheng are located, combined with uniform illumination by combining the characteristics of phosphor conformal coating The design method, designed a new type of free-form lens. The new lens provides conformal coating of the phosphor through the inner surface and controls the light through the outer surface to simultaneously achieve conformal coating and uniform illumination of the phosphor. Through this method, the traditional LED packaging process is simplified, the operation is simple, and it is convenient to be quickly applied to large-scale production of LEDs, and has great application prospects.
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