Temperature dependence of the photo- and electroluminescence of poly( p -phenylene vinylene) based polymers

We show that the exciton transport and decay processes in two poly( p -phenylene vinylene) (PPV) based semiconducting polymers exhibit distinct temperature dependence based on the energetic disorder of the polymer. Time-resolved photoluminescence (TRPL) spectroscopy and Monte Carlo exciton diffusion...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2018, Vol.6 (39), p.10569-10579
Main Authors: Rörich, Irina, Schönbein, Ann-Kathrin, Mangalore, Deepthi Kamath, Halda Ribeiro, Anielen, Kasparek, Christian, Bauer, Christian, Crăciun, N. Irina, Blom, Paul W. M., Ramanan, Charusheela
Format: Article
Language:English
Subjects:
Computer simulation
Decay
Diffusion rate
Electroluminescence
Electronic implants
Excitons
Organic light emitting diodes
Photoluminescence
Polymers
Polyphenylene vinylene
Temperature dependence
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We show that the exciton transport and decay processes in two poly( p -phenylene vinylene) (PPV) based semiconducting polymers exhibit distinct temperature dependence based on the energetic disorder of the polymer. Time-resolved photoluminescence (TRPL) spectroscopy and Monte Carlo exciton diffusion simulations are used to disentangle the contributions from radiative and non-radiative decay processes, with the latter including non-radiative decay due to exciton diffusion toward trap sites. In a highly disordered polymer, the exciton lifetime and quantum yield are nearly temperature independent. In the case of a less disordered polymer, the exciton lifetime and quantum yield increase with decreasing temperature, due to both freezing out vibrations and less exciton quenching by slowing down the diffusion toward trap sites. We further demonstrate that the temperature dependence of the electroluminescence of polymer light-emitting diodes comprising these polymers is directly correlated with the photoluminescence behavior.
ISSN:2050-7526
2050-7534
DOI:10.1039/C8TC01998C