Improvement of light out-coupling in organic light-emitting diodes by printed nanosized random texture layer

We demonstrate greatly improved light out-coupling efficiency and undistorted light output in organic light-emitting diodes (OLEDs) containing a nanosized random texture layer (nRTL). The nRTL is fabricated on a glass substrate by an inexpensive and simple printing process. Compared to a conventional device, OLEDs with the nRTL showed greatly improved power efficiency (+102%) at a luminance of 3000 cd/m2. The nRTL is free of viewing-angle-dependent color and brightness distortion and suitable for industrial mass production.

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► The printed nanosized random texture layer (nRTL) enhanced light out-coupling in OLEDs.
► The power efficiency were greatly improved (+102%) compared to conventional devices.
► The nRTL is free of the viewing-angle-dependent color distortion of the spectral shape.
► This technology can be high reproducibility and high uniformity at a large scale.