EFFICIENT WHITE LIGHT-EMITTING-DIODES REALIZED WITH NEW PROCESSABLE BLENDS OF CONJUGATED POLYMERS

Authors
TASCH S LIST EJW EKSTROM O GRAUPNER W LEISING G SCHLICHTING P ROHR U GEERTS Y SCHERF U MULLEN K
Citation
S. Tasch et al., EFFICIENT WHITE LIGHT-EMITTING-DIODES REALIZED WITH NEW PROCESSABLE BLENDS OF CONJUGATED POLYMERS, Applied physics letters, 71(20), 1997, pp. 2883-2885
Citations number
30
Categorie Soggetti
Physics, Applied
Journal title
Applied physics letters → ACNP
ISSN journal
00036951
Volume
71
Issue
20
Year of publication
1997
Pages
2883 - 2885
Database
ISI
SICI code
0003-6951(1997)71:20<2883:EWLRWN>2.0.ZU;2-J
Abstract
An alternative method for producing efficient white light-emitting pol ymer diodes based on a blend of two polymers is reported. The white li ght emission is composed of a broad blue emission of laddertype (polyp araphenylene) (m-LPPP) and a red-orange emission of a new polymer, pol y(perylene-co-diethynylbenzene) (PPDB). The red-orange electroluminesc ence emission is promoted by an excitation energy and charge transfer from m-LPPP to the PPDB. A concentration of 0.05% PPDB in the polymer blend is required in order to obtain white light emission. By insertin g an insulating material in the blend, so that a maximum external quan tum efficiency of 1.2% is obtained. (C) 1997 American Institute of Phy sics.