Related Experiment Video
Updated: Feb 14, 2026

Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
Published on: November 16, 2018
Extremely Low Roll-Off and High Efficiency Achieved by Strategic Exciton Management in Organic Light-Emitting Diodes
Tianmu Zhang1, Changsheng Shi1, Chenyang Zhao1
1State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry , University of Chinese Academy of Sciences , Changchun 130022 , P. R. China.
Abstract:
Phosphorescent organic light-emitting diodes (OLEDs) possess the property of high efficiency but have serious efficiency roll-off at high luminance. Herein, we manufactured high-efficiency phosphorescent OLEDs with extremely low roll-off by effectively locating the ultrathin emitting layer (UEML) away from the high-concentration exciton formation region. The strategic exciton management in this simple UEML architecture greatly suppressed the exciton annihilation due to the expansion of the exciton diffusion region; thus, this efficiency roll-off at high luminance was significantly improved. The resulting green phosphorescent OLEDs exhibited the maximum external quantum efficiency of 25.5%, current efficiency of 98.0 cd A-1, and power efficiency of 85.4 lm W-1 and still had 25.1%, 94.9 cd A-1, and 55.5 lm W-1 at 5000 cd m-2 luminance, and retained 24.3%, 92.7 cd A-1, and 49.3 lm W-1 at 10 000 cd m-2 luminance, respectively. Compared with the usual structures, the improvement demonstrated in this work displays potential value in applications.
More Related Videos
10:41Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode
Published on: May 31, 2018
09:03Optimizing Photoneuromodulation Techniques to Evaluate the Role of Green Light-Emitting Diodes in Pain Management
Published on: March 28, 2025
Related Concept Videos
Rolling Without Slipping
Rolling With Slipping
An object's rolling motion is characterized by its rotation around its axis, while linear motion refers to the object's translational motion along a surface. Frictional forces can...
Structure and Organization of Smooth Muscles
Structure of smooth muscle cell
Smooth muscle cells are spindle-shaped with tapering ends and a...
Prokaryotic Gene Structure and Organization
The Wave Nature of Light
Zener Diodes