An OLED device with green light emitting phosphor material has been made by a Japanese Research team of the Advanced Optical Electro Magnetic Field Science Lab.
This OLED device is said to have 210lm/W light emitting efficiency. This announcement was made by the Japan Society of Applied Physics (JSAP) during the 56th Spring Meeting, 2009, which was held at the Tsukuba University between March 30th and April 2nd 2009.
Headed by Professor Akiyoshi Mikami, the research team has increased the light extraction efficiency to 56.9 percent, which is more than double that of a conventional OLED device. Enhancing the low light extraction efficiency of OLED had a challenge.
The OLED device has been made with the mixture of host material CBP and iridium complex. The light emission peak ranges between 500 and 550 nm that tallies with green color. The OLED device is of a bottom emission type on a glass plate of 0.7 mm thickness.