Using green light materials to emit blue light, a new breakthrough in Taiwan LED technology

White light is the star of tomorrow's lighting technology. The US Department of Energy (DOE) predicts that in 2020, the cost, efficiency and longevity indicators of O led lighting will be inconsistent with LED !

However, the industry is currently suffering from the short life of organic light-emitting blue phosphorous materials. O led light-emitting layer is mainly composed of red fluorescent material, green light material and blue light phosphor material mixed into white light. One of the materials decays in life, which will make the whole OLED fail. How to overcome the different material life and become the industry Challenge the puzzle.

Taiwan ITRI developed "O led gain coupled plasma surface technology", the green luminescent material converts blue light spectrum, break through the bottleneck short lifetime of the organic blue light emitting material. (All images source: ITRI)

The solution to the "Blu-ray" of the Taiwan Institute of Technology is to use the technology to make the green light material a blue light source, and to develop the OLED surface plasma coupling gain technology PCOLED (Plasmon-Coupled Organic) LED).

When the Taiwan Institute of Technology was conducting experiments on the light-emitting structure of green light materials, it was found that the green light material actually emitted the impossible blue light, which enabled the ITRI to open a new research direction, and later used physical thinking to design green light materials. The special structure, constantly adjusting the parameters, finally found out and summarized the reasons and methods for the blue light emitted by the green light material.

Finally, the DML structure is used to generate the planar plasma coupling effect (Plasmon-Coupled), which can convert the light-emitting spectrum of the green light material into blue light. The white light OLED can replace the traditional blue light material layer with the green light material, which not only has a short life span. It can be solved even more than 20 times longer than traditional OLEDs.

In terms of efficiency, through continuous research and development and component optimization, DML blue light emission efficiency can exceed the level of existing blue fluorescent materials and most known blue phosphorescent materials, reaching 35 cd/A. OLED DML white light technology has been proven to emit white light with a color rendering (CRI) of 77 and a color temperature of 2039 K, which can be used for indoor lighting, and ITRI has successfully illuminated a large white light module of 10 cm x 10 cm.

At present, the ITRI team has applied for patents in Taiwan, Germany, the United States and China, and has cooperated with private industry to further master key OLED materials and process technologies, and to move toward industrialization.

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