High-tech LED network compilation
A Japanese research team successfully built an OLED device that uses a green phosphor material to achieve high luminous efficiency of 210 lm/W.
The research team is led by Professor Akiyoshi Mikami, who is from the Advanced Photoelectric Magnetic Field Research Laboratory at the Kanazawa Institute of Technology. They have improved light extraction efficiency to 56.9%, twice as many as existing OLED devices. The team released the results at the 2009 Japan Applied Physics Forum, which was held at the University of Tsukuba, Japan.
Increasing light extraction efficiency to 30% is considered a huge challenge for OLEDs. With this new technology, the efficiency of OLED displays and luminaires will increase dramatically.
The OLED device developed by the team is of the bottom-emitting type, with light coming out through the transparent electrode at the bottom. In addition, the 07 mm thick glass sheet has a refractive index as high as 2.03, and the glass is attached to the substrate. There are optical lens arrays on the glass plate that are only 0.3 mm apart.
The main material of the emissive layer of such a light-emitting device is called "CBP", and is composed of yttrium, Ir(ppy)3, etc., and its luminescence peak wavelength ranges from 500 to 550 nm in the green wavelength range.
When the luminance reaches 10 cd/m2, its luminous efficiency reaches 210 lm / W, and the light extraction rate reaches 56.9%. On the other hand, when there is no high refractive index glass plate, its efficiency is only 94.3 lm / W, which means that the glass plate increases the light extraction rate by 2.3 times.
High-efficiency green OLED device developed by Kanamiwa Institute of Technology Mikami Lab
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