Open AccessDevelopment of a highly efficient, strongly coupled organic light-emitting diode based on intracavity pumping architecture
Author(s) -
JyhYeong Chang,
Tong Lin,
Chao Kai Hsu,
Szu Yu Chen,
Shun Yu Hong,
Guo Sian Ciou,
Cheng Chung Jaing,
Cheng Chung Lee
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.410831
Subject(s) - oled , materials science , optoelectronics , electroluminescence , quantum efficiency , diode , absorption (acoustics) , polariton , laser , optics , layer (electronics) , nanotechnology , physics , composite material
We report a highly efficient polariton organic light-emitting diode (POLED) based on an intracavity pumping architecture, where an absorbing J-aggregate dye film is used to generate polariton modes and a red fluorescent OLED is used for radiative pumping of emission from the lower polariton (LP) branch. To realize the device with large-area uniformity and adjustable coupling strength, we develop a spin-coating method to achieve high-quality J-aggregate thin films with controlled thickness and absorption. From systematic studies of the devices with different J-aggregate film thicknesses and OLED injection layers, we show that the J-aggregate film and the pump OLED play separate roles in determining the coupling strength and electroluminescence efficiency, and can be simultaneously optimized under a cavity design with a good LP-OLED emission overlap for effective radiative pumping. By increasing the absorption with thick J-aggregate film and improving the electron injection of pump OLED with Li 2 CO 3 interlayer, we demonstrate the POLED with a large Rabi splitting energy of 192 meV and a maximum external quantum efficiency of 1.2%, a record efficiency of POLEDs reported so far. This POLED architecture can be generally applied for exploration of various organic materials to realize novel polariton devices and electrically pumped lasers.