Improved Performance of Organic Light-Emitting Devices by Integrating Periodic Microstructure
Yan-Gang Bi, Yun-Fei Li, Jing Feng and Hong-Bo Sun
In this article, recent progresses in fabrication of periodic microstructure in organic light-emitting devices (OLEDs) and their effects on improving the device performance are reviewed. The waveguide and surface plasmon-polariton (SPP) modes that were generally lost in conventional bottom-emitting OLEDs have been successfully recovered by employing the microstructure, and a much enhanced light extraction has been observed. The introduction of the periodic corrugation into the top emitting OLEDs (TOLEDs) is effective in relieving the tradeoff between device lifetime and efficiency, through the coupling of the SPPs associated with the Ag cathode and the microcavity modes. A microstructured cavity with periodically and gradually changed cavity length has been introduced into the TOLEDs and exhibited its effects in eliminating the angular dependence of the emission wavelength and intensity.
Keywords: organic light-emitting devices, surface plasmon polariton, periodic microstructure