Efficient cyano-containing electron-transporting polymers for light-emitting diodes

Authors
Liu, MS Jiang, XZ Herguth, P Jen, AKY
Citation
Ms. Liu et al., Efficient cyano-containing electron-transporting polymers for light-emitting diodes, CHEM MATER, 13(11), 2001, pp. 3820
Citations number
16
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
CHEMISTRY OF MATERIALS
ISSN journal
08974756 → ACNP
Volume
13
Issue
11
Year of publication
2001
Database
ISI
SICI code
0897-4756(200111)13:11<3820:ECEPFL>2.0.ZU;2-6
Abstract
Two copolymers composed of 9,9-di-n-hexylfluorene and 2,5-dicyanobenzene (P F-CNP (3:1) and PF-CNP (1:1)) were synthesized via the Suzuki coupling reac tion. By attaching two electron-withdrawing cyano groups onto the phenylene ring, the electron affinity and conduction of polyfluorenes are greatly en hanced. The device based on PF-CNP (3:1) has a low turn-on voltage (3.4 V), bright blue emission (5430 cd/m(2) at a bias voltage of 7.4 V), and a maxi mum external quantum efficiency of 0.50% due to both optimized electron aff inity and conduction.