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Manufacturers Have Begun To Take Measures For The Components Cathode

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KanazawaUNIVERSITY pointed out that, in order to further improve light extraction efficiency, even with the element surface of the light extraction layer is enough (Figure 7). By simulation experiments, three components internally generated photons, about 50% of the loss due to surface plasmon resonance. This phenomenon is occurred in the element emitting surface of the negative electrode (cathode) surface.

Actively attempts to suppress such a loss of (surface plasmon), helps to further improve light extraction efficiency, and therefore change the structure of the cathode bold. This is the “multi-cathode structure.” Both of prototype with this configuration also has the green light emitting organic EL element of the element surface of the light extraction layer, the surface plasmon loss was significantly reduced by about 50% to about 10%, and luminous efficiency 85lm / W is increased to more than 2 times 185lm / W. The light extraction efficiency of approximately 47%, which is very high values ??as a thin element.

According to the Kanazawa Institute of Technology professor, no light extraction of light do to improve the organic EL led element internally generated approximately 50% of the surface plasmon losses disappear. The three fine people found the pair of metal electrodes with a multistage structure of the thin electrode and the reflective layer and the like, can significantly reduce the loss of surface plasmon, thereby improving the light emitting efficiency of the method.

Manufacturers have begun to take measures for the components cathode. For example, the Toshiba Chat SID 2012 on the luminous efficiency of 91lm / W, with the element in the front of the element side of a particular light extraction layer. But from the cathode material of aluminum (Al) is replaced by other high-reflectance material. “Does not explain the increased efficiency thanks to the reflectivity of the surface plasmon loss reduction may also play a role (Toshiba).

The third focus is to improve the luminous efficiency of the organic EL lighting the blue light emitting material is substantially improved. Previously, the blue light-emitting materials, compared with the red and green light-emitting materials, the luminous efficiency and life on the development is very slow. For example, does not yet have sufficient depth and luminescence lifetime of blue phosphorescent material.

The light is dark blue, then you can use a fluorescent material, but the principles of the fluorescent material on the internal quantum efficiency is less than 25%. The phosphorescent material up to 100%. Blue light-emitting fluorescent material can only use is to further improve the luminous efficiency of organic EL lighting a huge obstacle led lights.

Recently, break the boundaries of research and development have made progress. Although not yet found a dark blue phosphorescent material. But “to promote the development of the 3rd generation of light-emitting materials (Kyushu University, state-of-the-art organic Optoelectronics Research Centre Professor ANDA 1000 R & D team of the wave vector) (Figure 8). 1 on behalf of fluorescent material, on behalf of the phosphorescent material, and new materials for the 3rd generation.