The Japan Institute of Physical Chemistry and the Science and Technology Promotion Agency announced on the 25th that a research group that developed a 250-nm deep ultraviolet light-emitting diode (LED) successfully achieved 15 milliwatts of high output power and electron injection efficiency for the first time in the world. Increased by 80%. The deep ultraviolet light-emitting diode has a maximum output power of 7 times higher than that of the current similar equipment, and has a good sterilization effect and can decompose harmful substances such as dioxins at high speed, and has reached a practical level. The research results have been applied for on February 24th, and the paper is scheduled to be published in the Applied Physics Letter published on March 25.
粤ICP备12010857号-3 LAMPLIC TECHNOLOGY Copyright@2007-2010 All Rights Reserved. QQ：871173356
UV LED output power set a new record
High-power deep-ultraviolet light-emitting diodes with wavelengths between 220 nm and 350 nm are widely used in sterilization, water purification, medical treatment, high-density optical recording, high color rendering LED illumination, and high-speed decomposition of hazardous materials. Up to now, deep ultraviolet light sources have been dominated by ultraviolet lasers and gas lamps using excimer lasers and various frequency-doubled lasers and other mediums, but they have the disadvantages of large size, short life, and high price, which are difficult to practically apply. The high-intensity deep ultraviolet LED and the deep ultraviolet LD using semiconductor can be miniaturized, and are cheap, efficient, and long-lived, and have a wider application prospect.
The aluminum gallium nitride material is considered to be the most ideal deep ultraviolet luminescent material. The research team has achieved the highest in the world by reducing the dislocation density of the aluminum gallium nitride buffer layer and inserting a multi-quantum barrier as an electron block layer into the upper portion of the quantum well luminescent layer. Power output. The research results have broken the previous understanding that high-violet LEDs are unlikely to achieve high efficiency, and successfully achieve a practical level of UV output power. At the same time, the multi-quantum barrier is also possible not only for the ultraviolet light-emitting elements but also for the efficiency of the already practical blue LEDs, green LDs, LEDs, and white LED lamps.
In terms of sterilization, the highest direct ultraviolet sterilizing efficiency is in the wavelength range from 250 nm to 280 nm, and in the decomposition of organic matter, dust, dioxins and other difficult-to-decompose pollutants, ultraviolet light is irradiated with a wavelength of 270 nm to 320 nm. The ultraviolet irradiation system of a photocatalyst such as titanium oxide has a relatively good decomposition effect. The research team plans to further increase the efficiency of deep ultraviolet light sterilization from 250 nm to 280 nm to achieve high-efficiency wavelengths from 220 nm to 390 nm, and conduct in-depth studies on the high-power output of deep ultraviolet rays, with a view to 1.5. The efficiency of % is increased to ten digits.
China's UV curing coatings account for half of the world's total output