Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.2778739
Title: Noise characterization of light-emitting devices based on conjugated copolymers of fluorene and thiophene moieties
Authors: Ke, L.
Tang, W.
Song, Y.
Chen, Z.K.
Chua, S.J. 
Issue Date: 2007
Source: Ke, L.,Tang, W.,Song, Y.,Chen, Z.K.,Chua, S.J. (2007). Noise characterization of light-emitting devices based on conjugated copolymers of fluorene and thiophene moieties. Journal of Applied Physics 102 (6) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.2778739
Abstract: Degradation induced changes in the structural and optical properties of polyfluorene-based light-emitting diodes are examined by using electroluminescence and low frequency noise (LFN) spectroscopic techniques. The materials studied are poly[2,7- (9, 9′ -dihexylfluorene)-alt-bithiophene] (P1) and poly[2,7- (9, 9′ -dihexylfluorene)-alt-thieno[3,2- b] thiophene] (P2). Improved emission spectra for a light-emitting device based on polymer P2 in terms of current efficiency, spectra stability, and lifetime are observed. A polymer P2-based device also presents long lifetime predicted by the smaller slope in the initial LFN spectra. Correlation of device LFN spectra with polymer structure change and lifetime is established. The increase in noise level predicts the undergoing degradation in bulk material and the increase in the noise slope predicts the fluctuation of carrier number and change in polymer structure. The redshift in emission spectrum for P2 after long-time driving is also picked up by the LFN spectrum. © 2007 American Institute of Physics.
Source Title: Journal of Applied Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/56807
ISSN: 00218979
DOI: 10.1063/1.2778739
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

3
checked on Dec 13, 2017

WEB OF SCIENCETM
Citations

4
checked on Oct 31, 2017

Page view(s)

17
checked on Dec 9, 2017

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.