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Organic Two-Layer Light-Emitting Diodes Based on High-T_g Hole-Transporting Polymers with Different Redox Potentials

Bellmann, Erika and Shaheen, Sean E. and Grubbs, Robert H. and Marder, Seth R. and Kippelen, Bernard and Peyghambarian, Nasser (1999) Organic Two-Layer Light-Emitting Diodes Based on High-T_g Hole-Transporting Polymers with Different Redox Potentials. Chemistry of Materials, 11 (2). pp. 399-407. ISSN 0897-4756. doi:10.1021/cm980614r.

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A series of soluble arylamine-based hole-transporting polymers with glass transition temperatures in the range of 130−150 °C have been synthesized. The synthetic methodology allows facile substitution of the aryl groups on the amine with electron-withdrawing and electron-donating moieties, which permits tuning of the redox potential of the polymer. These polymers have been used as hole-transport layers (HTLs) in two-layer light-emitting diodes ITO/HTL/Alq/Mg [ITO = indium tin oxide, Alq = tris(8-quinolinato)aluminum]. The maximum external quantum efficiency of the device increases if the redox potential of the HTL is increased to facilitate reduction of the positive charge carriers at the HTL/Alq interface. A fluorinated hole-transport polymer with a relatively large redox potential (390 mV vs ferrocenium/ferrocene) yielded the device with the highest external quantum efficiency of 1.25% photons/e-. The device stability, however, follows the opposite trend. The device with the most electron-rich HTL exhibited the best performance after prolonged usage.

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Grubbs, Robert H.0000-0002-0057-7817
Additional Information:© 1999 American Chemical Society. Received September 8, 1998. Revised Manuscript Received November 13, 1998. Publication Date (Web): January 21, 1999. We thank Prof. Neal R. Armstrong, Dr. Stephen Barlow, Dr. S. Thayumanavan, and Prof. Ghassan E. Jabbour for very helpful discussions and Dr. Steven Barlow and Dr. S. Thayumanavan for providing samples of the molecular TPD derivatives. Financial support was received through the Center of Advanced Multifunctional Nonlinear Optical Polymers and Molecular Assemblies (CAMP) from the Office of Naval Research. NSF-AASERT student support through BMDO-AFOSR is gratefully acknowledged.
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Office of Naval Research (ONR)UNSPECIFIED
Air Force Office of Scientific Research (AFOSR)UNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20180313-132634260
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Official Citation:Organic Two-Layer Light-Emitting Diodes Based on High-Tg Hole-Transporting Polymers with Different Redox Potentials. Erika Bellmann, Sean E. Shaheen, Robert H. Grubbs, Seth R. Marder, Bernard Kippelen, and Nasser Peyghambarian. Chemistry of Materials 1999 11 (2), 399-407. DOI: 10.1021/cm980614r
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85281
Deposited By: Tony Diaz
Deposited On:13 Mar 2018 20:44
Last Modified:15 Nov 2021 20:27

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