[Source: "High-tech LED - "Technology and Applications" July issue / Tang Shengshan Long Zonghui
introduction
As human economic activity increases, the earth's non-renewable resources are slowly decreasing. In order to protect the global environment, people are doing everything possible to reduce the consumption of resources. China is a country with relatively few power resources. Power is particularly tight in economically developed areas. Therefore, energy-saving equipment and energy-saving lamps have been promoted to save energy and improve the efficiency of power resources. Semiconductor lighting technology is an effective way to improve the efficiency of power resources. . As the core technology of semiconductor lighting technology, Light Emitting Diode (LED) consumes only 1/10 of the energy of traditional energy. It has low operating voltage, low power consumption, high luminous efficiency and stable performance. Widely used in traffic lights, display signs, mobile phone backlights, etc. Now LED is gradually developing for lighting. The life of a typical LED lamp is 75,000 hours, the life of an incandescent lamp is only 1000 hours, the white LED is 50% more energy-efficient than an incandescent lamp, and the colored LED can save up to 90%.
LED packaging is one of the key technologies for LED applications. It is filled, potted or molded to fill liquid materials into devices equipped with electronic components and circuits, and cured to high light transmission under normal temperature or pressure. A polymer insulating material excellent in physical properties such as high rate, high refractive index, high weather resistance, and resistance to ultraviolet radiation. It can enhance the integrity of the electronic device, improve the resistance to external shock and vibration, improve the insulation between the internal component lines, avoid the linear exposure of components and lines, and improve the waterproof and moisture-proof performance of the device.
At present, the commonly used encapsulating materials are epoxy resin and silicone material [1]. Epoxy resin is inexpensive and widely used, but it is not suitable for high power LED packaging. The package material used for the power LED device requires a refractive index higher than 1.5 (25 ° C) and a light transmittance of not less than 98% (light transmittance of the sample having a thickness of 1 mm at a light wavelength of 450 nm). The white light LED based on ultraviolet light needs the outer packaging material to have strong anti-UV aging ability [2]. Epoxy resin has poor heat resistance, poor moisture resistance, poor flexibility, easy yellowing, brittleness, low impact strength, easy stress cracking, shrinkage of cured product, etc., and internal stress caused by sudden temperature changes. Disconnected, resulting in retirement. Moreover, the refractive index of the encapsulating epoxy differs greatly from that of the semiconductor, so the epoxy resin encapsulated LED has low light efficiency. The silicone material can be made into a high-transparency (high transmittance of more than 95%), high refractive index (up to 1.51) high temperature resistant rubber elastomer for LED packaging materials, which can not only overcome the heat resistance of epoxy resin It has the fatal shortcomings of poor performance, poor temperature resistance, high stress, poor flexibility, and easy yellowing. It can also increase the luminous flux of 5% of LED lamps, which greatly compensates for the lack of LED light flux.
Silicone materials are a new type of polymer material that has gradually emerged in the middle of the last century. This special material has excellent high and low temperature resistance, weathering resistance, electrical insulation, waterproof and gas permeability and physiological inertia. In the early days, it was mainly used by the military defense industry, and it has become an indispensable chemical material for the society and people to develop production and improve the living environment. It is widely used in aviation, electronic appliances, food and medical, construction, automobile machinery and cosmetics. The field has a wide market space and good development prospects.
Because of the packaging of silicone materials, LEDs can be developed into high-power lighting applications and become a revolution in energy-saving lighting. Silicone materials are used for potting of LEDs (light-emitting diodes) to replace the current epoxy-type packaging materials and promote the development of LEDs in high brightness and high power. This kind of lighting meets the needs of a conservation-oriented and energy-saving society and is a development trend in the future.
For more information, please refer to the July issue of "High-tech LED - Technology and Applications" magazine.
introduction
As human economic activity increases, the earth's non-renewable resources are slowly decreasing. In order to protect the global environment, people are doing everything possible to reduce the consumption of resources. China is a country with relatively few power resources. Power is particularly tight in economically developed areas. Therefore, energy-saving equipment and energy-saving lamps have been promoted to save energy and improve the efficiency of power resources. Semiconductor lighting technology is an effective way to improve the efficiency of power resources. . As the core technology of semiconductor lighting technology, Light Emitting Diode (LED) consumes only 1/10 of the energy of traditional energy. It has low operating voltage, low power consumption, high luminous efficiency and stable performance. Widely used in traffic lights, display signs, mobile phone backlights, etc. Now LED is gradually developing for lighting. The life of a typical LED lamp is 75,000 hours, the life of an incandescent lamp is only 1000 hours, the white LED is 50% more energy-efficient than an incandescent lamp, and the colored LED can save up to 90%.
LED packaging is one of the key technologies for LED applications. It is filled, potted or molded to fill liquid materials into devices equipped with electronic components and circuits, and cured to high light transmission under normal temperature or pressure. A polymer insulating material excellent in physical properties such as high rate, high refractive index, high weather resistance, and resistance to ultraviolet radiation. It can enhance the integrity of the electronic device, improve the resistance to external shock and vibration, improve the insulation between the internal component lines, avoid the linear exposure of components and lines, and improve the waterproof and moisture-proof performance of the device.
At present, the commonly used encapsulating materials are epoxy resin and silicone material [1]. Epoxy resin is inexpensive and widely used, but it is not suitable for high power LED packaging. The package material used for the power LED device requires a refractive index higher than 1.5 (25 ° C) and a light transmittance of not less than 98% (light transmittance of the sample having a thickness of 1 mm at a light wavelength of 450 nm). The white light LED based on ultraviolet light needs the outer packaging material to have strong anti-UV aging ability [2]. Epoxy resin has poor heat resistance, poor moisture resistance, poor flexibility, easy yellowing, brittleness, low impact strength, easy stress cracking, shrinkage of cured product, etc., and internal stress caused by sudden temperature changes. Disconnected, resulting in retirement. Moreover, the refractive index of the encapsulating epoxy differs greatly from that of the semiconductor, so the epoxy resin encapsulated LED has low light efficiency. The silicone material can be made into a high-transparency (high transmittance of more than 95%), high refractive index (up to 1.51) high temperature resistant rubber elastomer for LED packaging materials, which can not only overcome the heat resistance of epoxy resin It has the fatal shortcomings of poor performance, poor temperature resistance, high stress, poor flexibility, and easy yellowing. It can also increase the luminous flux of 5% of LED lamps, which greatly compensates for the lack of LED light flux.
Silicone materials are a new type of polymer material that has gradually emerged in the middle of the last century. This special material has excellent high and low temperature resistance, weathering resistance, electrical insulation, waterproof and gas permeability and physiological inertia. In the early days, it was mainly used by the military defense industry, and it has become an indispensable chemical material for the society and people to develop production and improve the living environment. It is widely used in aviation, electronic appliances, food and medical, construction, automobile machinery and cosmetics. The field has a wide market space and good development prospects.
Because of the packaging of silicone materials, LEDs can be developed into high-power lighting applications and become a revolution in energy-saving lighting. Silicone materials are used for potting of LEDs (light-emitting diodes) to replace the current epoxy-type packaging materials and promote the development of LEDs in high brightness and high power. This kind of lighting meets the needs of a conservation-oriented and energy-saving society and is a development trend in the future.
For more information, please refer to the July issue of "High-tech LED - Technology and Applications" magazine.
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