LED potting glue is classified by function

Reading Volume：【 2844 】

Time：【 2017-12-26 】

1. Mechanical protection to improve reliability;
2. Strengthen heat dissipation to reduce chip junction temperature and improve LED performance;
3. Optical control, improve the light output efficiency, optimize the beam distribution LED potting glue is classified according to the cured
This series of products are classified into gel type, rubber type and resin type according to their cured state. The viscosity and hardness can be adjusted according to the usage. Application of LED potting glue
During the use of LED, the loss of photons generated by radiation recombination when emitted outwards mainly includes three aspects: internal structural defects of the chip and absorption of materials; reflection loss of photons at the exit interface due to refractive index difference; and due to The total reflection loss caused by the incident angle greater than the critical angle of total reflection. Therefore, a lot of light cannot be emitted from the chip to the outside. By coating a layer of transparent adhesive layer with relatively high refractive index-Haoming LED silica gel on the surface of the chip, since the adhesive layer is between the chip and the air, the loss of photons at the interface is effectively reduced and the light extraction efficiency is improved. . In addition, the role of potting glue also includes mechanical protection of the chip, stress relief, and as a light guide structure. Therefore, it is required to have high light transmittance, high refractive index, good thermal stability, good fluidity, and easy spraying. In order to improve the reliability of Haoming LED packaging, the potting compound is also required to have the characteristics of low moisture absorption, low stress, and aging resistance. Currently commonly used potting adhesives include epoxy resin and silica gel. Due to its high light transmittance, high refractive index, good thermal stability, low stress, and low moisture absorption, silica gel is significantly better than epoxy resin and is widely used in high-power LED packaging, but the cost is relatively high. Studies have shown that increasing the refractive index of silica gel can effectively reduce the photon loss caused by the physical barrier of refractive index and increase the external quantum efficiency, but the performance of silica gel is greatly affected by the environmental temperature. As the temperature increases, the thermal stress inside the silica gel increases, resulting in a decrease in the refractive index of the silica gel, thereby affecting the light efficiency and light intensity distribution of the LED.

Page【1】

Previous： Describe the standard recom

Next： What are the functions and

Other News

Jiadi New Material Selected as a Pilot Enterprise of Dongguan Doubling Program in 2023

Jiadi New Material was recognized as a national specialized, special and new

Epoxy adhesive in electronic components

The performance and application of acrylate structural adhesive

Factors affecting the performance of wet-curing polyurethane adhesives