With the maturity of the domestic LED industry chain, the performance of raw materials of the products is continuously optimized, and the performance difference of each LED packaging manufacturer is gradually reduced. In order to compete for market share, the price war continues to be staged, and the price reduction of products continues to refresh records. The optimal combination of product materials and large-scale production of equipment has become an important way for the industry to make profits. At the same time, the improvement of product technology will also be an important factor for the stability of packaging products. Stability determines success or failure, and details determine development. Dai Xiaodong (hereinafter referred to as “the authorâ€) of Zhaochi Energy Saving COB R&D Center visited some customers, and most of the application technicians predicted that the application of COB precipitation technology products will explode, because most famous international COB manufacturers use this technology, and the appearance is high-end. The atmosphere, the upper grade, the product colloid temperature is low, the power of the same luminous surface product can be further improved, the optical density is larger, and the advantages are obvious. As most domestic COB manufacturers can mass produce the precipitated products, the advantages of the international COB big factory are gradually reduced. Does this process have a qualitative change in the product's light type? Here, the author talks about the effect of phosphor precipitation technology on the light type of the product. The blue chip excitation phosphor is the most conventional white light production method. Ideally, the evenly distributed phosphor is excited by uniform blue light, and the light exit surface will lead to uniform white light. The product light pattern is perfect, as shown in Fig. 1, but most of the current COB This is not the case. The larger light-emitting surface chip is less, the power is low, the phosphor around the chip is fully excited, the color is white or blue, and the phosphor that is relatively far away from the chip cannot be fully excited, and the color is yellowish, as shown in Figure 2. , resulting in uneven light, such as the macula, blue heart and so on. Usually we can solve the problem by modifying the light-emitting surface or increasing the number of chips, optimizing the chip arrangement, and optimizing the rubber surface structure. The finished application end can be optimized by lens optical design, adding sun-shading and sanding treatment, but optimizing the product light pattern by designing the secondary optical lens will sacrifice too much luminous flux, and at the same time designing a high-value mold to encroach on enterprise profits, so the lamp The best design of the bead is the key to the high cost performance of the whole lamp. We not only pay attention to the shape design of the lamp, we pay more attention to the light quality of the product. Under the comprehensive consideration of power, heat, light type and price, we are faced with the choice of lamp bead, which may The effect of the precipitation process bead will be considered, and the specific light type effect is also required, and a combined test or a simulation test according to the lens (reflector cup) is also required. The author has repeatedly found the lens light distribution, the uniformity of the light type of the phosphor precipitation process product is worse than the conventional process, the edge of the light type is jagged, the local blue spot of the light type is obvious, etc., which seems to disappoint us, the precipitation process and It does not give us the perfect effect of lighting. Of course, the light quality of the precipitation process product can also be optimized, but it will sacrifice brightness and increase cost. Some lens makers admit that COB products have thinner phosphors that challenge the design of lenses (reflector cups) that require more complex optical processing of stray light. Because part of the lens imaging problem is obvious, according to the principle of convex lens or Fresnel imaging, the product light type will restore the internal structure of the lamp bead, and the phosphor of the precipitation process product sinks into the bottom of the substrate, the rubber surface becomes clearer and clear, and the chip arrangement is more obvious. When the lens imaging problem is significant, the precipitation process will be more difficult to align than conventional conventional precipitation processes. Some of these products even have blue spots. The author always believes that the key to solving the problem is to clarify the source and essence of the problem, and to solve the problem from the source. The intermediate remedy can only be used as a temporary countermeasure, and the versatility is not strong. The microscopic analysis of the phosphor distribution in the precipitation process and the conventional process will be carried out below: Conventional non-precipitated products have uniform light emission. As shown in Figure 1, there are phosphors distributed around and above the chip, and the light emission is relatively uniform. The precipitation process product has blue spots, as shown in Figure 2, the conventional chip has five-sided light, and the chip has phosphor coating. However, the four sides of the chip are not coated with phosphor, and the other phosphors sink into the bottom of the substrate. The encapsulant has no phosphor, and the blue light on the side of the chip directly leads to the rubber surface, which becomes a blue spot in the light type.
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