Use green materials emit blue light successfully extend the life of OLED

White is the lighting technology star, the U.S. Department of energy (DOE) forecast in 2020, the cost of OLED lighting, efficiency and life index will be equal to LED! But now the industry has suffered a short service life of organic light-emitting materials p the plight of blue.

ITRI R & D OLED surface plasmon coupling technology ", the green light emitting materials spectrum into blue, blue organic light emitting materials to break through the bottleneck of short service life. (all photograph: ITRI)

The OLED light emitting layer is mainly composed of a red fluorescent material, green material and blue phosphate materials three mixed into white light, one kind of material life of decay, can let the entire OLED failure, how to overcome the material life is not a problem, become a challenge to industry.

"A blue ITRI" of the road, also is not to use any blue light material, but to make technology green materials become blue source, which developed the OLED surface plasmon coupling technology PCOLED (Plasmon-Coupled Organic LED)

It is in the light emitting structure ITRI experiment of green materials, green materials found incredibly issued the impossible to open the blue light, ITRI new research directions, then the use of physical thinking, special structure design of green materials, constantly adjusting the parameters, finally find out and summarize the reasons and methods of the original green material emits blue light.

Finally, using DML structure to produce planar plasmonic coupling effects (Plasmon-Coupled), the green light emitting materials spectrum converted to blue, white OLED can use green materials to replace the traditional blue light material layer, not only can solve the problem of short service life, even by as much as 20 times longer than traditional OLED.

In terms of efficiency, through continuous development and optimization of components, DML light emitting efficiency has to go beyond the existing blue fluorescent material and most of the known blue phosphorescent material level, can reach 35cd/A. OLED DML white light after verification, can be issued by the CRI (CRI) reached 77, 2039 K color temperature white light, can be used for indoor lighting, and has successfully lit 10 cmx10 cm / a large area of white light module.

ITRI team have related technology in Taiwan, Germany, the United States and Chinese, patent application, and has cooperation with the industrial sector, to grasp the key materials of OLED and manufacturing technology to industrialization.

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