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Exciplex Formation in Light Emitting Molecularly Doped Polymer Diodes Based on Polycarbonate:TPD:PBD Blends

Published online by Cambridge University Press:  21 March 2011

Gabriele Giro ,
Massimo Cocchi ,
Piergiulio Di Marco  and
Valeria Fattori
Gabriele Giro
Affiliation:
CNR-FRAE, Area della Ricerca, Via P. Gobetti 101, 40129-Bologna, Italy
Massimo Cocchi
Affiliation:
CNR-FRAE, Area della Ricerca, Via P. Gobetti 101, 40129-Bologna, Italy
Piergiulio Di Marco
Affiliation:
CNR-FRAE, Area della Ricerca, Via P. Gobetti 101, 40129-Bologna, Italy
Valeria Fattori
Affiliation:
CNR-FRAE, Area della Ricerca, Via P. Gobetti 101, 40129-Bologna, Italy
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Abstract

Observation of electroluminescence (EL) in single layer of molecularly doped polymer (MDP) films is reported. The EL diodes constructed by spin coating technique contain Bisphenol-A-polycarbonate (PC), N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine (TPD) and 2-(4-biphenyl)-5-(4-terbutylphenyl)1,3,4-oxadiazole (PBD) with the configuration: ITO/PC(20%):TPD(40%):PBD(40%)/Ca, Ag. The EL emission ranges in the green-yellow part of the spectrum and is red shifted respect to the photolu minescence (PL) both of PC:TPD and of PC:PBD. It can be assigned to emission from an exciplex state resulting from the interaction between TPD and PBD, as confirmed by stationary and pulsed fluorescence spectroscopy, and also from other states (triplets, traps or ‘electoplexes’) emitting at lower energies.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 598: Symposium BB – Electrical, Optical, & Magenetic Properties...V , 1999 , BB11.3
Copyright
Copyright © Materials Research Society 1999

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