Characteristics of LED silicone potting

With the development of science and technology, power sources tend to become denser and smaller, which puts higher demands on the stability of power sources. In order to prevent damage to electronic components caused by moisture, dust, and harmful gases, slow down vibration, prevent external force damage, stabilize component parameters, and minimize adverse external effects, it is necessary to encapsulate power supplies and other components. LED silicone potting is an auxiliary material for LED packaging, with high refractive index and high transmittance. It can protect LED chips and increase the luminous flux of LED. It has low viscosity, is easy to defoaming, and is suitable for encapsulation and molding, making LED have good durability and reliability. Below, we will introduce some product types and characteristics of LED silicone potting.

The commonly used sealing adhesives currently include epoxy resin and silicone. Silicone, due to its high transmittance, high refractive index, good thermal stability, low stress, and low moisture absorption, is significantly superior to epoxy resin. It is widely used in high-power LED packaging, but at a higher cost. Research has shown that increasing the refractive index of silicone can effectively reduce photon loss caused by the physical barrier of refractive index and improve external quantum efficiency, but the performance of silicone is greatly affected by environmental temperature. As the temperature increases, the thermal stress inside the silicone increases, leading to a decrease in the refractive index of the silicone, thereby affecting the LED light efficiency and intensity distribution.

Features of LED silicone potting products:

1. Long term protection for sensitive circuits or electronic components can provide effective protection for electronic modules and devices, whether they are simple or complex in structure and shape. Antioxidant, non yellowing, and stable physical properties.

2. Having stable dielectric insulation performance, it is an effective barrier to prevent environmental pollution. The elastic body formed after curing can eliminate the stress caused by impact and vibration in a large temperature and humidity range.

3. It can maintain its original physical and electrical properties in various working environments, resist the degradation of ozone and ultraviolet rays, and has good chemical stability. Anti UV, can prevent UV leakage or shield UV rays.

4. After sealing, it is easy to clean and remove for repairing electronic components, and new sealing glue is injected into the repaired area.

5. Excellent temperature resistance performance. Good heat dissipation, resistant to high and low temperatures, can be used for a long time at -40 ℃ -250 ℃ without affecting performance. And only products that fully comply with the EU ROHS directive and pass the UL94-V0 fire rating can be exported for corresponding applications.

Nowadays, LED silicone potting is also widely used for sealing and sealing high heat and fire resistant products such as solar energy, backlight, HID, LCD electronic display screens, circuit boards, electronic components, LED street light drive power supplies, LED spotlight power modules, electroplating power supplies, power rectifiers, transformers, generator circuit boards, ovens, and high-power electronic components, as well as for sealing and protecting electronic modules and circuit boards that require high temperature resistance and heat dissipation.