Cheap and wavelength-independent OLED light extraction: Page 2 of 2

April 25, 2018 // By Julien Happich
Cheap and wavelength-independent OLED light extraction
Looking at optimizing the light extraction of OLEDs and their overall external quantum efficiency, researchers from the University of Michigan have demonstrated that a microlens array embedded between the OLED's bottom transparent ITO electrode and the glass substrate was cheap to implement, yet very effective for extracting trapped light in the active region of the OLED.

The researchers then implemented the SEMLA with a number of phosphorescent OLEDs, attaching an external microlens array to the SEMLA substrates to further enhance outcoupling. They report an external quantum efficiency of up to 70 ± 4% (for green phosphorescent OLEDs) and up to 50 ± 3% for white PHOLEDs, enhancing light output by a factor of 2.8 and 3.1 compared to similar devices built on conventional glass substrates. This wavelength-independent enhancement can be used with regular glass substrates in place of sapphire substrates, to benefit from both higher efficiency and lower manufacturing costs, conclude the authors, seeing their development suitable for both display and lighting applications.

University of Michigan -

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