[High-tech LED News] The Taiwan Optoelectronics Association (PIDA) pointed out that the special application market for UV LEDs is highly optimistic. At present, Japanese companies engaged in the production of UV LED epitaxial wafers and chips are Nichia (Nichia) and Nitride Semiconductor (NS). ) and so on. Taiwan has companies such as Yuanyuan, Taigu, New Century, and Guangfang.
Although NS is available from UV LED epitaxial wafers, chips, packages, and application products, it is basically based on 355nm to 400nm low-power products. US SemiLEDs also sells large and low-power UV LED chips, and the package also has its subsidiary Silicon Base Development to provide customer package services. As for Taiwanese manufacturers such as Yuyuan, Taigu, New Century, and Guangfang, they are developing long-wavelength UV (315-400nm) intervals, with emphasis on products above 360nm.
Among them, mercury lamps are used for hardening of epoxy resin; LED lamps are used for hardening of acrylic resin. However, as the LED power increases, the energy that is not used for hardening in the 365 nm frequency domain is converted into heat, and the heating promotes the hard epoxy CUV LED. Although the power is low, it is gradually improving; the mercury lamp has short life and toxicity. It will most likely be replaced by LED lights in the future.
Ultraviolet LED chips and red, green and blue phosphors can produce high color rendering white light, but limited by the current luminous efficiency and price competitiveness, the market is mainly based on the application of ultraviolet light. It is still difficult to break into the field of white light lighting applications.
In addition, LED applications in the medical field generally require high color rendering, low heat generation, and high stability. The sterilizing application is ultraviolet light before and after 375 nm and 280 nm, and the photocatalyst is excited by the two wavelength light sources, and the sterilizing power is better. The 280nm UV LED chip with strong bactericidal power is under continuous research.
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