A research team from Xiamen University covered the ultra-thin aluminum film on the surface of the high-aluminum nitride deep ultraviolet light-emitting diode to solve the key problem of "light extraction efficiency" that restricts the wider application of this light-emitting device. The industrial application of such devices in medical, environmental protection, military and other fields has opened new methods and ideas.
The research team of Kang Junyong, a professor at the School of Physics and Electromechanical Engineering of Xiamen University, has gone through several years of research. Huang Kai, associate professor of the research team and Gao Na, a doctoral student, have borrowed an ultra-thin aluminum film to solve this problem. When an ultra-thin aluminum film with a thickness of only 5 nanometers is coated on the surface of a deep ultraviolet light-emitting diode, this aluminum film not only does not reflect the light emitted by the device more like a traditional mirror, but cleverly directs the device toward The light emitted from the side is collected, passes through the aluminum film layer, and is emitted from the front, thereby improving the light extraction efficiency.
Huang Kai explained that this is because when the aluminum film is made very thin, the nano-effects in it make it different from the traditional mirror to reflect the light back, but to concentrate absorption to realize the collection and frontal emission of light.
Tests have shown that the contribution of this aluminum "coat" to the light extraction efficiency of UV LEDs will vary with wavelength. Generally speaking, the shorter the wavelength, the higher the efficiency. The data shows that with this aluminum film coated, the ultraviolet light emitting diode with a wavelength of about 310 nanometers can increase the light extraction efficiency by about 20%; the ultraviolet light emitting diode with a wavelength of about 290 nanometers can increase the light extraction efficiency by about 50%; and for For deep ultraviolet LEDs with a wavelength of about 280 nanometers, the light extraction efficiency can be increased by 130%.
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