Breath Figure Patterned Light Extraction Structures for High Performance Organic Light-Emitting Diodes
발표자
()
초록
내용
We report light extraction efficiency enhanced organic light-emitting diodes (OLEDs) using microlens array films prepared by a simple solution-processed imprinting technique with breath figure patterns. The characteristics of angle-dependent spectrum stability for OLEDs with the breath figure extraction film have not been studied so far. The films with breath figure micro-patterns (BFMP) effectively extract confined light in the glass substrate, which leads to the greatly improved light extraction performance of OLEDs. We observe the enhancement of external quantum efficiency of the OLEDs employing the BFMP extract film is about 1.51, corresponding to the enhancement of the power efficiency by a factor of 1.65. Moreover, the device with the light extraction film shows the limited angle-dependency of emission spectrum over viewing angles. The BFMP films prepared with a low-cost, simple, and solution-processable fabrication process can pave the way to achieving high-performance OLEDs.