Graded doping profiles for reduction of carrier trapping in organic light-emitting devices incorporating doped polymers
- 29 January 2001
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 78 (5) , 574-576
- https://doi.org/10.1063/1.1344223
Abstract
Dispersing emissive dopants into luminescent polymers is an effective approach to enhance luminescence and to tune emission color in organic light-emitting devices incorporating polymer films. However, the carrier trapping effect due to emissive dopants often causes deterioration of electrical characteristics. In this letter, we show that, by introducing a graded doping profile to match the carrier recombination zone in the doped polymer, the carrier trapping, and the deterioration of electrical characteristics can be minimized while the enhancement in efficiency maintains. The finite-source dye-diffusion thermal transfer is used to produce graded doping profiles into a luminescent polymer. The effectiveness of this approach has been demonstrated in both single-layer and heterostructure devices incorporating doped polymers.Keywords
This publication has 16 references indexed in Scilit:
- Finite-source dye-diffusion thermal transfer for doping and color integration of organic light-emitting devicesApplied Physics Letters, 2000
- Charge carrier trapping effect by luminescent dopant molecules in single-layer organic light emitting diodesJournal of Applied Physics, 1999
- Three-color organic light-emitting diodes patterned by masked dye diffusionApplied Physics Letters, 1999
- Highly efficient phosphorescent emission from organic electroluminescent devicesNature, 1998
- Doping effects in organic electroluminescent devicesJournal of Applied Physics, 1998
- Efficient organic electroluminescent devices using single-layer doped polymer thin films with bipolar carrier transport abilitiesIEEE Transactions on Electron Devices, 1997
- A study of the electroluminescence process of an organic electroluminescence diode with an Alq3 emission layer using a dye-doping methodJournal of Physics D: Applied Physics, 1995
- Efficient organic electroluminescent device using a single bipolar carrier transport layerJournal of Applied Physics, 1992
- Organic electroluminescent devices based on molecularly doped polymersApplied Physics Letters, 1992
- Electroluminescence of doped organic thin filmsJournal of Applied Physics, 1989