Fluorescent adhesive for COB encapsulation of LED

Abstract

The invention discloses a fluorescent adhesive for COB encapsulation of an LED. The fluorescent adhesive is formed by mixing the following components in parts: 80-100 parts of allochroic silicagel, 50-60 parts of waterproof silicagel, 3-5 parts of rare earth long-acting noctilucent powder, 2-3 parts of reflecting powder, 2-3 parts of colorful flash powder, 1-3 parts of aluminium paste, 3-5 parts of resin diamond, 10-15 parts of blue fluorescent powder and 10-12 parts of yellow fluorescent powder. As the materials, such as the noctilucent powder and the reflecting powder, are added into the fluorescent adhesive for COB encapsulation of the LED, the spatial chroma uniformity of the LED is great, and the color rendering of the LED is effectively improved. The fluorescent adhesive is particularly suitable for vehicle lamps and can reduce the difference between the scene seen by a driver and the actual object state, so that the driving safety is improved.

Description

technical field [0001] The invention relates to a fluorescent glue for LEDs, in particular to a fluorescent glue for COB packaged LEDs. Background technique [0002] At present, in the LED industry, there are mainly the following methods for the phosphor powder used in LEDs to achieve white light: 1. Coating yellow phosphor powder that can be excited by blue light on the blue LED chip, the blue light emitted by the LED chip and the phosphor powder emitted. Yellow light complements each other to form white light; 2. Coat green and red phosphor powder on the blue LED chip, and the blue light emitted by the chip is combined with the green light and red light emitted by the phosphor powder to obtain white light; 3. In purple or ultraviolet light LED chips It is coated with phosphor powder of three primary colors or multiple colors, and the long-wave ultraviolet light or purple light emitted by the chip is used to excite the phosphor powder to realize white light emission. Among...

AI Technical Summary

Problems solved by technology

Among the three methods, the effective conversion efficiency of phosphors used in the second method is low, especially the efficiency of red phosphors needs to be greatly improved. The third method also has similar problems, and red and green with high conversion efficiency Phosphor powder is mostly sulfide system, which has poor luminescence stability and large light attenuation