As far as today is concerned, white-light patch LEDs still have poor uniformity of illumination, and the life of the sealing material is not long, and the application advantages of white-light patch LEDs cannot be exerted. However, as far as the demand level is concerned, not only the general lighting use, but also the widespread application of mobile phones, LCD TVs, automobiles, medical treatments, etc., the technical research results that are most suitable for developing stable white-light patch LEDs are quite concerned. .
Increased importance of packaging materials and fluorescent materials
If you want to use it as an LCD TV backlight application, you will have to overcome more problems, because the LCD TV's continuous use time is up to several hours, even 10 hours, so because of this long time In use, white LEDs that are used as backlights must have a brightness that does not decay due to continuous use.
At present, Xinyuan Electronics has published a high-power white-light patch LED whose luminous power is dozens of times that of a low-power white-light patch LED. Therefore, it is expected to use high-power white-light patch LED instead of fluorescent light as lighting equipment. One of the difficulties that must be overcome is the diminishing brightness.
For example, when a white light patch LED continuously uses 1W of power for a long time, the brightness of the white light is gradually reduced in the latter half of the continuous use. Of course, it is not only the high power white light patch LED that occurs, such as low power. White light-strip LEDs also have such problems, simply because low-power white-light patch LEDs do not particularly highlight such problems because of the different products they are used in.
There are quite a few operators, because they do not produce LEDs, so they can only do some research and development on the PCB board, but this is not enough, so Xinyuan Electronics chooses the white light patch LED with good heat dissipation. The metal material on the PCB board can be closely connected with the heat sink in the white light patch LED package, and the high-power white light patch LED with the heat sink design is connected with the PCB board to achieve the heat dissipation capability.
Changes in packaging materials improve the life of white LEDs by up to 4 times
Of course, the problem of heat is not only affecting the brightness performance, but also the life of the white-light patch LED itself. Therefore, in this part, Xinyuan Electronics has continuously developed white-light patch LED packaging materials to respond. , continuously improve the impact of the brightness of the white light patch LED.
In the past, epoxy resin used as a white LED chip packaging material has poor heat resistance. It may happen that the epoxy resin has changed color before the life of the white LED chip itself reaches. Therefore, in order to improve heat dissipation, more current must be released. This architecture is quite important.
In addition, not only the thermal phenomenon will affect the epoxy resin, but even the short wavelength will cause some problems for the epoxy resin. This is because the white light patch LED luminescence spectrum also contains short-wavelength light. Epoxy resin is quite easily destroyed by short-wavelength light in white-light patch LEDs, even low-power white-light patch LEDs will cause epoxy damage, not to mention the high-power white-light patch LEDs. Short-wavelength light is more, so the deterioration is naturally accelerated, and even some products have a service life of less than 5,000 hours after continuous lighting.
LED packaging industry: Xinyuan Electronics is facing the abandonment of epoxy resin, and the use of tantalum resin and ceramics as packaging materials, in order to improve the life of LED:
Diversified application market potential Nichia Chemical actively develops white light patch LED semiconductor laser
Due to the expectation that LEDs will achieve white-purity LEDs with high color purity and high brightness requirements, all industries will continue to improve from each field to achieve this goal, but at the speed of progress, it still looks like Quite slow.
Therefore, some operators have begun to consider other technologies to achieve the current industry's brightness requirements for white-like patch LEDs. In the field of high-brightness blue and white light-emitting LEDs, Nichia Chemical is working hard to develop a part of the research and development direction toward the development of white lasers.
Nichia Chemical has developed a semiconductor light source using the same GaN-based material as the white-light patch LED, and has developed a white light source. In terms of current performance, the brightness has reached about 10 cd/mm. Today's white light patch It is quite difficult for the LED to reach this luminance value. Even if the current is increased, it is expected to increase the brightness. However, this will increase the temperature of the junction, and the result will not only reduce the overall luminous efficiency, but also waste considerable More unnecessary power.
The white-light patch LED semiconductor laser developed by Nichia Chemical Co., Ltd. no longer separates the phosphor material at the chip end, but separates the portion generated by the light-emitting portion from the white light. The laser semiconductor of Nichia is 200mW. A blue-violet semiconductor laser that emits 405 nm wavelength light, connecting a blue or blue-violet semiconductor laser to the surface of the fiber, and allowing white light to pass from the fiber coated with the phosphor material.
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