Change the way of light, led will be cheaper
Recently, the "Advanced Organic Optoelectronics Research Center" (opera) of Kyushu University in Japan has developed "hyperfluorescence" which only uses fluorescent materials but has a luminous efficiency of more than 90%. The effect is comparable to that of the rare metal "phosphorus", but the cost is large. reduce.
Basically, the existing OLED light-emitting materials can be roughly divided into fluorescent and phosphorescent materials according to different light-emitting principles. The maximum luminous efficiency of fluorescent materials is 25%, and that of phosphorescent materials is 100%. However, the luminous efficiency of the new material when excited by light is as high as that of the phosphorescent material. According to Chihaya Adachi, a professor at Kyushu University, director of the Opera Center, this is due to the phenomenon of "thermally active delayed fluorescence (tadf)" in the new material.
Don't think that OLED technology is almost oligopolized by South Korea. In fact, high-end OLED technology not only continues to develop in Japan, but also academic institutions continue to improve OLED technology, hoping to achieve more energy-saving, lower cost and simpler production processes.
While maintaining high-efficiency luminescence, the wide selection of luminous colors is also a major feature of this material. opera produced organic el panels with luminescent colors of blue, green, chartreuse, yellow and orange. The luminous efficiency of yellow luminescent materials is only 26±1% when excited by light, but the luminous efficiency of green and yellow-green luminescent materials is 74-94%, and the luminous efficiency of blue and orange luminescent materials is about 47%. Although this difference still needs to be worked out, Professor Anda of Opera believes that once the new material is commercialized, phosphorus, a rare metal, will not be needed. This will have a significant impact on organic OLED materials, and the relative impact on cost will be greater.
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