Universität zu Köln

Khodabakhshi, Elham, Ramanan, Charusheela, Michels, Jasper J., Bonus, Sven, Hertel, Dirk, Meerholz, Klaus ORCID: 0000-0001-7450-4672, Forster, Michael, Scherf, Ulrich and Blom, Paul W. M. (2020). Trap-Assisted Triplet Emission in Ladder-Polymer-Based Light-Emitting Diodes. Adv. Electron. Mater., 6 (5). HOBOKEN: WILEY. ISSN 2199-160X

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Abstract

The charge transport and recombination in light-emitting diodes (LEDs) based on a methyl-substituted poly(p-phenylene) ladder polymer (Me-LPPP) are investigated. The transport is characterized by a high room-temperature hole mobility of 2 x 10(-8) m(2) V-1 s(-1) combined with anomalously strong electron trapping. Their electroluminescence (EL) spectrum is characterized by a blue singlet emission, a broad green featureless peak, and a yellow-orange triplet emission. The voltage dependence of the EL spectrum and negative contribution to the capacitance indicate that the triplet-emission is of trap-assisted nature, consistent with the strong electron trapping. Consequently, the color purity of the blue emissive Me-LPPP polymer LEDs can be strongly improved using trap dilution.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Khodabakhshi, Elham UNSPECIFIED UNSPECIFIED UNSPECIFIED Ramanan, Charusheela UNSPECIFIED UNSPECIFIED UNSPECIFIED Michels, Jasper J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bonus, Sven UNSPECIFIED UNSPECIFIED UNSPECIFIED Hertel, Dirk UNSPECIFIED UNSPECIFIED UNSPECIFIED Meerholz, Klaus UNSPECIFIED orcid.org/0000-0001-7450-4672 UNSPECIFIED Forster, Michael UNSPECIFIED UNSPECIFIED UNSPECIFIED Scherf, Ulrich UNSPECIFIED UNSPECIFIED UNSPECIFIED Blom, Paul W. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-340590
DOI:	10.1002/aelm.202000082
Journal or Publication Title:	Adv. Electron. Mater.
Volume:	6
Number:	5
Date:	2020
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	2199-160X
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Physical Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CONJUGATED POLYMERS; KETONIC DEFECTS; FLUORESCENCE; TRANSPORT; ELECTROLUMINESCENCE; PHOSPHORESCENCE; ELECTRON Multiple languages Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/34059