Deep analysis of power white LED packaging technology and development trend of phosphor technology

LED product application range

LED not only retains three advantages, but also retains the advantages of small size, low driving voltage, adjustable black color, and good concentrating function. With the continuous improvement of LED luminous intensity, its application range is also expanding, and gradually enters the lighting category. Therefore, more and more units involved in the development and production of high-brightness and white-light LED products have been introduced. Many companies that have been LED packaging companies and consume lighting products have also entered. It is known that there are more than 1,000 companies nowadays. Development of lighting, special lighting and automotive lights.

In addition to the large number of international LED products used in the flashing of various electrical appliances and devices, instruments, equipment, non-mainstream collections have also advanced by leaps and bounds.

First, large, medium and small LED flash screen: indoor and outdoor billboards, stadium scoreboards, audio flash screens, etc.

The second is traffic lights: city traffic lights, highways, railways and airport signal lights in major and medium-sized cities across the country.

The third is light color lighting: outdoor landscape lighting and indoor cover lighting.

International LED packaging materials and accessories are also compatible. Except for ordinary materials, most of the materials are supplied domestically. Non-mainstream materials include gold wire, silicon aluminum wire, epoxy resin, silica gel, silver glue, conductive adhesive, bracket, strip and molding compound, packaging mold and fixture. Has formed a large-scale wealth chain.

About high power LED package use

High power LED electronic packages are complicated due to their structure and process. It has been a hot topic in recent years, especially the high-power white LED electronic package is a hot spot for research.

The choice of LED packaging methods, materials, structures and processes is not determined by factors such as electronic product chip structure, optoelectronic/mechanical characteristics, meticulous use and interest. After more than 40 years of development, the LED package has experienced the development of the bracket type (LampLED chip type (SMDLED power type LEDPowerLED).

As the power of the chip increases, the need for solid-state lighting technology is particularly demanding, and new higher demands are placed on the optical, thermal, electrical, and mechanical structures of the LED package. In order to effectively improve the light extraction efficiency, a new technical idea must be adopted to stop the packaging idea.

Forming white light. Its characteristics are non-mainstream including particle size, shape, luminous efficacy, conversion efficiency, shake (hot and chemical), etc., where luminous efficacy and conversion efficiency are critical. Studies have shown that as the temperature drops, the quantum efficiency of the phosphor increases, and the effect of the phosphor in the LED package lies in the color-composite. When the light is reduced, the wavelength of the radiation also changes, which causes the color temperature and chromaticity of the white LED to change, and the higher temperature accelerates the aging of the phosphor.