Title
Non-radiative recombination losses in polymer light-emitting diodes
Author
Kuik, M.
Koster, L.J.A.
Dijkstra, A.G.
Wetzelaer, G.A.H.
Blom, P.W.M.
Publication year
2012
Abstract
We present a quantitative analysis of the loss of electroluminescence in light-emitting diodes (LEDs) based on poly[2-methoxy-5-(2′-ethylhexyloxy)- p-phenylenevinylene] (MEH-PPV) due to the combination of non-radiative trap-assisted recombination and exciton quenching at the metallic cathode. It is demonstrated that for an MEH-PPV LED the biggest efficiency loss, up to 45%, arises from extrinsic non-radiative recombination via electron traps. The loss caused by exciton quenching at the cathode proves only to be significant for devices thinner than 100 nm. Removal of electron traps by purification is expected to enhance the efficiency of polymer LEDs by more than a factor of two. © 2012 Elsevier B.V. All rights reserved.
Subject
Mechatronics, Mechanics & Materials
HOL - Holst
TS - Technical Sciences
High Tech Systems & Materials
Industrial Innovation
Efficiency
Langevin recombination
Non-radiative recombination
Polymer light-emitting diodes
Shockley-Read-Hall recombination
Trap-assisted recombination
Langevin recombination
Non-radiative recombinations
Polymer light-emitting diodes
Shockley-Read-Hall recombinations
Trap-assisted recombination
Cathodes
Efficiency
Electroluminescence
Electron traps
Organic light emitting diodes (OLED)
Polymers
To reference this document use:
http://resolver.tudelft.nl/uuid:67ae5450-eb42-4fa7-a11e-221c28736ded
DOI
https://doi.org/10.1016/j.orgel.2012.02.009
TNO identifier
461305
ISSN
1566-1199
Source
Organic Electronics: physics, materials, applications, 13 (6), 969-974
Document type
article