Optimization of polymer light emitting devices using TiO x electron transport layers and prism sheets
Journal
Organic Electronics: physics, materials, applications
Journal Volume
13
Journal Issue
11
Pages
2667-2670
Date Issued
2012
Abstract
The internal and external efficiency of polymer light emitting devices were found can be simultaneously improved by insertion a high refractive index material, titanium oxide (TiOx), to the emission layer and a prism sheet attached to the substrate. The TiOx layer increased the internal efficiency due to a better electron injection and hole confinement. However, it led a wider angular emission profile with more photons trapped in the substrate. By using the prism sheet, those trapped light was efficiently coupled to the air. The extraction efficiency enhancement was increased from 33.1% to 54.4% and the overall current efficiency was improved up to 86%. © 2012 Elsevier B.V. All rights reserved.
SDGs
Type
journal article