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New Triarylamine-Containing Polymers as Hole Transport Materials in Organic Light-Emitting Diodes: Effect of Polymer Structure and Cross-Linking on Device Characteristics

Bellmann, Erika and Shaheen, Sean E. and Thayumanavan, S. and Barlow, Stephen and Grubbs, Robert H. and Marder, Seth R. and Kippelen, Bernard and Peyghambarian, Nasser (1998) New Triarylamine-Containing Polymers as Hole Transport Materials in Organic Light-Emitting Diodes: Effect of Polymer Structure and Cross-Linking on Device Characteristics. Chemistry of Materials, 10 (6). pp. 1668-1676. ISSN 0897-4756. http://resolver.caltech.edu/CaltechAUTHORS:20180507-155610554

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Abstract

A series of poly(norbornenes) with pendant triarylamine (TPA) groups has been synthesized by ring-opening metathesis polymerization and investigated as hole transport materials in organic two-layer light-emitting diodes (LEDs). Efficient device fabrication through spin casting of the hole transport layer (HTL) was possible, since the polymers exhibited excellent film formation properties. LEDs of the form ITO/poly(norbornene)-TPA/Alq_33/Mg (ITO) indium tin oxide, Alqq_3 = tris(8-quinolinato)aluminum) showed bright green emission with external quantum efficiencies of up to 0.77% (1.30 lm/W) for 20 nm thick HTL films. The length and polarity of the linker between the triarylamine functionality and the polymer backbone were varied systematically. The device performance was found to depend strongly on these structural differences. Substitution of ester groups by less polar ether functionalities greatly enhances external quantum efficiencies, lowers the operating voltage, and improves the stability of the device. Further improvement of the device characteristics is achieved by reducing the length of the alkyl linker. The HTL can be conveniently cross-linked by UV irradiation. Cross-linking was found to decrease device performance. A maximum external quantum efficiency of 0.37% was achieved for an Alq_3-LED with cross-linked HTL.


Item Type:Article
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URLURL TypeDescription
https://dx.doi.org/10.1021/cm980030pDOIArticle
ORCID:
AuthorORCID
Grubbs, Robert H.0000-0002-0057-7817
Additional Information:© 1998 American Chemical Society. Received January 21, 1998. Revised Manuscript Received March 19, 1998. We thank M. Weck, Dr. M. W. Wagaman, and Dr. B. R. Maughon for helpful discussions and M. Weck for contributing the norborn-2-ene-5-carbonyl chloride. Financial support was provided through Center for Advanced Multifunctional Nonlinear Optical Polymers and Molecular Assemblies (CAMP) by the Office of Naval Research.
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Office of Naval Research (ONR)UNSPECIFIED
Record Number:CaltechAUTHORS:20180507-155610554
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180507-155610554
Official Citation:New Triarylamine-Containing Polymers as Hole Transport Materials in Organic Light-Emitting Diodes:  Effect of Polymer Structure and Cross-Linking on Device Characteristics Erika Bellmann, Sean E. Shaheen, S. Thayumanavan, Stephen Barlow, Robert H. Grubbs, Seth R. Marder, Bernard Kippelen, and Nasser Peyghambarian Chemistry of Materials 1998 10 (6), 1668-1676 DOI: 10.1021/cm980030p
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86270
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:07 May 2018 23:07
Last Modified:07 May 2018 23:07

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