Hole transport in substituted polydiphenylacetylene light-emitting devices: mobility improvement through carbazole moiety

Carrier-transport control is a critical factor in achieving high performance of organic light-emitting devices (LEDs). We have compared hole conduction between polydiphenylacetylene (PDPA) derivatives without and with a carrier-transport moiety, such as poly[1-( p- n-butylphenyl)-2-phenylacetylene]...

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Bibliographic Details
Published in:Synthetic metals 2000-06, Vol.111, p.403-408
Main Authors: Sun, R.G, Wang, Y.Z, Wang, D.K, Zheng, Q.B, Epstein, A.J
Format: Article
Language:English
Subjects:
Carbazole moiety
Electroluminescence
Hole transport
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Summary:Carrier-transport control is a critical factor in achieving high performance of organic light-emitting devices (LEDs). We have compared hole conduction between polydiphenylacetylene (PDPA) derivatives without and with a carrier-transport moiety, such as poly[1-( p- n-butylphenyl)-2-phenylacetylene] (PDPA- nBu) and poly[1-( p- n-carbazolyphenyl)-2-phenylacetylene] (PDPA-Cz), respectively. Hole transport is studied by current–voltage measurements and fitted using the space-charge limited current model. It is shown that the hole mobility can be improved several orders of magnitude by attaching carbazolyl side groups to the PDPA back bone (PDPA-Cz), as compared to that of PDPA- nBu. The electroluminescence is studied and compared in heterostructured LEDs using PDPA- nBu and PDPA-Cz as hole-transport layers. It is found that carrier transport and balance have significant roles in the performance of the substituted PDPA-based electroluminescent devices.
ISSN:0379-6779
1879-3290
DOI:10.1016/S0379-6779(99)00383-5