Selection criteria for packaging materials for deep ultraviolet LED lamp beads.P2.5 soft LED module.P4.81 indoor LED display

　　At present, the deep UV 280 nanometer wavelength LED power in the entire UV industry is very low, and its efficient sterilization effect relies on higher unit area illumination rather than high power. The illuminance per unit area of UVLED is inversely proportional to the square of the spacing. Regarding the selection of packaging materials for deep ultraviolet LED lamp beads, our optoelectronic technology company commonly analyzes the following points for everyone

　　Light emitting material: LED light emitting structures usually use transparent materials for light output and conversion, and also play a maintenance role on the chip and circuit layer. Traditional organic materials have poor temperature resistance, low thermal conductivity, and UV degradation, making it difficult to meet the packaging requirements of deep ultraviolet LEDs. In recent years, the industry has tried to use inorganic transparent materials such as quartz glass and sapphire to encapsulate deep ultraviolet LED beads.

　　Heat dissipation substrate materials: LED heat dissipation substrate materials commonly include resin, metal, and ceramic. Both resin and metal substrates have an organic resin insulation layer, which reduces the thermal conductivity of the heat dissipation substrate and affects its heat dissipation performance; Ceramic substrates have many advantages such as high mechanical strength, good insulation, high heat transfer, good temperature resistance, and low thermal expansion coefficient, making them an effective choice for heat dissipation substrates used in deep ultraviolet LED bead packaging.

　　Welding bonding materials: Deep ultraviolet LED bead welding materials include chip solid crystal materials and substrate welding materials, which are respectively used to achieve welding between chips, glass cover plates (lenses), and ceramic substrates. Flip chip often uses gold tin eutectic method to achieve chip solidification, which has high strength, better interface quality, and high thermal conductivity of the bonding layer, reducing LED thermal resistance.

　　Deep ultraviolet LED lamp beads have crucial value in industries such as sterilization and disinfection, biochemical testing, health services, and covert communication. Especially in the sterilization and disinfection industry, deep ultraviolet LEDs commonly use high-energy ultraviolet radiation to irradiate microorganisms and destroy nucleic acid structures, thereby achieving the goal of microbial inactivation. Compared with the traditional sterilization technology, the deep ultraviolet LED lamp beads have the advantages of high sterilization efficiency, strong acceptability, no chemical pollutants, simple operation, etc., and can be widely used in air, water and surface disinfection and sterilization.

　　So far, the disinfection of deep ultraviolet LED lamp beads has been pointed out as an effective way to eliminate novel coronavirus, which has been used in public places, transportation tools, safety protection and other industries, providing scientific and technological support to curb the spread of COVID-19.

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