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Synthesis of high-T_g hole-transporting polymers with different redox potentials and their performance in organic two-layer LEDs

Bellmann, Erika and Shaheen, Sean E. and Marder, Seth R. and Kippelen, Bernard and Grubbs, Robert H. and Peyghambarian, Nasser (1998) Synthesis of high-T_g hole-transporting polymers with different redox potentials and their performance in organic two-layer LEDs. In: Organic Light-Emitting Materials and Devices II. Proceedings of SPIE. No.3476. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 322-331. ISBN 9780819429315. https://resolver.caltech.edu/CaltechAUTHORS:20181107-153056514

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Abstract

Organic hole transport materials are used in organic LEDs, where they substantially improve device performance if placed as a hole transport layer (HTL) between the anode and the electroluminescent layer (EL). Soluble polymeric hole transport materials with high glass transition temperatures are of particular interest, because they allow for efficient device fabrication through spin casting of the HTL, and high glass transition temperatures have been found to improve thermal and long-term stability of the device. The redox potential of the hole transport material determines the facility of charge injection at the anode/HTL and the HTL/EL interfaces, thus affecting the overall device efficiency. We have synthesized a series of soluble hole-transporting polymers with glass transition temperatures in the range of 130 degrees C to 150 degrees C. The synthetic method allows facile substitution of the hole transport functionality with electron-withdrawing and electron-donating groups, which permits tuning of the redox potential of the polymer. These polymers have been used as HTL in tow-layer devices ITO/HTL/Alq/Mg. The maximum external quantum efficiency increase, if the redox potential is changed to facilitate reduction of the hole transport material at the HTL/EL interface. Electron-deficient derivatives show higher external quantum efficiencies. The device stability, however, follows the opposite trend.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.332629DOIArticle
ORCID:
AuthorORCID
Grubbs, Robert H.0000-0002-0057-7817
Alternate Title:Synthesis of high-Tg hole-transporting polymers with different redox potentials and their performance in organic two-layer LEDs
Additional Information:© 1998 Society of Photo-optical Instrumentation Engineers (SPIE). We thank Prof. Neal R. Armstrong for very helpful discussions and Dr. Steven Barlow for valuable technical assistance with the cyclic voltammetry. Furthermore, we would like to thank Dr. Steven Barlow and Dr. S. Thayumanavan for providing samples of the molecular TPD derivatives. Financial support was received through the Center for Advanced Multifunctional Nonlinear Optical Polymers and Molecular Assemblies (CAMP) from the Office of Naval Research.
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)UNSPECIFIED
Subject Keywords:hole-transporting polymer, two-layer organic LED, redox potential, external quantum efficiency, glass transition temperature
Series Name:Proceedings of SPIE
Issue or Number:3476
Record Number:CaltechAUTHORS:20181107-153056514
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20181107-153056514
Official Citation:Erika Bellmann, Sean E. Shaheen, Seth R. Marder, Bernard Kippelen, Robert H. Grubbs, Nasser Peyghambarian, } "Synthesis of high-Tg hole-transporting polymers with different redox potentials and their performance in organic two-layer LEDs", Proc. SPIE 3476, Organic Light-Emitting Materials and Devices II, (16 December 1998); doi: 10.1117/12.332629; https://doi.org/10.1117/12.332629
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90730
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:08 Nov 2018 00:00
Last Modified:03 Oct 2019 20:28

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