OLED high photosynthetic efficiency to solve the problem of material and structure

OLED lighting to the efficiency to achieve the application level of fluorescent lamp, its power efficiency must be at least 70 lm/W, although currently about 100 lm/W OLED lighting devices have been reported, but it is in very extreme cases made, usually made of the efficiency of OLED lighting devices and only 30 ~ 50 lm/W, obviously it is not up to par.

from the material point of view, to achieve such a high efficiency, luminous efficiency can reach 100% of the phosphorescent materials must be used, the green and red light phosphorescent materials have no problem, play an important role of htac is blue phosphorescent materials. Now very lack of high efficiency, high stability of the blue phosphor luminescence materials, is also the main technical difficulties of OLED lighting device efficiency, so the development and practical application of high efficiency, high stability of blue phosphor luminescence materials production technology have become the main research direction in the field.

from the device structure perspective, effective device structure design is the key to improve the efficiency of the device, at present, a lot of good device structure including light-emitting layer structure, single light emitting structure, laminated structure and the roof structure. More luminous layer structure is the preparation of white light OLED devices, one of the most mature technology, device performance is the best, but complex processes may affect its yield and production costs of OLED lighting devices in the future, and sometimes this kind of structure component is spectrum and chromaticity coordinates with the disadvantage of driving voltage changes. However, due to the good performance of the luminous layer structure, and the spectrum and chromaticity coordinates with the driving voltage change entirely can be resolved through the design of the device structure, so if you can get control on yield and improving, the structure still can yet be regarded as a kind of production technology, Philips, UDC, Novaled company is currently using this structure.

single light emitting structure to some extent, although you can avoid color purity, along with the change of the driving voltage may also simplify the process in the production process, but the efficiency and stability of the mismatching problem also make the application cannot be obtained in actual application of this structure.

laminated structure has a single light-emitting layer and the luminous layer structure, the characteristics of it is produced by electric charge layer will glow multiple unit together a device structure, laminated device has very good spectrum stability, and high luminous efficiency, high luminous intensity and good stability characteristics of laminated structure device in practical application is very competitive, if we can further improve in the aspect of the laminated structure of complex process, laminated structure device is expected to become the mainstream of lighting white OLED production technology.

top structure because of its launch in effectively and improve the efficiency of light emitting area advantages, also could become an essential part of the lighting white OLED technology development direction, and combine other structure and top emission structure can develop higher performance of white light OLED.

edit: Steve