Researchers from KAIST, led by Professor Yoo Seunghyup, developed a novel quasi-planar light extraction structure that enables to more than double the light output from OLED devices.
The researchers optimized the radiative power transfer in finite-sized OLED emission and reception areas, and then added a quasi-planar light extraction structure that has both a curved section and a straight section. Experiments have shown that this design minimized light loss caused by back-reflection within the structure and allowed more light to be emitted externally within a limited space.
The researchers have shown that the new structure increases light output from OLED devices - even more than OLEDs with a MicroLens Array (MLA), which is commonly used to increase light extraction. Another advantage of the structure is that there is less crosstalk compared to MLA solutions, which so has to be much larger than the sub-pixel size.
As you can see in the image above, the light output of the new quasi-planar light extraction OLED device (on the right) is brighter than the MLA OLED (middle) and a standard OLED device (left).
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