The authors thank M. Melucci and G. Barbarella (CNR-ISOF Bologna) for providing T5. Fruitful discussions with V. A. L. Roy, E. Da Como and R. Zamboni (CNR-ISMN Bologna) are also acknowledged. Research supported by the EU-IST-FET program under project IST-33057 (ILO) and the Italian Ministry MIUR under Project FIRB-RBNE033KMA.
Tuning Optoelectronic Properties of Ambipolar Organic Light- Emitting Transistors Using a Bulk-Heterojunction Approach†
Article first published online: 30 NOV 2005
Copyright © 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Functional Materials
Volume 16, Issue 1, pages 41–47, January, 2006
How to Cite
Loi, M. A., Rost-Bietsch, C., Murgia, M., Karg, S., Riess, W. and Muccini, M. (2006), Tuning Optoelectronic Properties of Ambipolar Organic Light- Emitting Transistors Using a Bulk-Heterojunction Approach. Adv. Funct. Mater., 16: 41–47. doi: 10.1002/adfm.200500424
- Issue published online: 27 DEC 2005
- Article first published online: 30 NOV 2005
- Manuscript Accepted: 4 JUL 2005
- Manuscript Received: 21 FEB 2005
- Field-effect transistors, organic;
- Light-emitting devices;
Bulk-heterojunction engineering is demonstrated as an approach to producing ambipolar organic light-emitting field-effect transistors with tunable electrical and optoelectronic characteristics. The electron and hole mobilities, as well as the electroluminescence intensity, can be tuned over a large range by changing the composition of a bimolecular mixture consisting of α-quinquethiophene and N,N′-ditridecylperylene-3,4,9,10-tetracarboxylic-diimide. Time-resolved photoluminescence spectroscopy reveals that the phase segregation of the two molecules in the bulk heterojunction and their electronic interaction determine the optoelectronic properties of the devices. The results presented show that the bulk-heterojunction approach, which is widely used in organic photovoltaic cells, can be successfully employed to select and tailor the functionality of field-effect devices, including ambipolar charge transport and light emission.