Influence of hole transport units on the efficiency of polymer light emitting diodes

Frádáric Laquai, Dirk Hertel*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


Charge transport and electroluminescence efficiency in spirobifluorene polymers containing triarylamine as hole transport unit have been studied. The hole mobility as measured by the time-of-flight technique was found to be on the order of 10-4 cm2 V-1 s-1. The field and temperature dependences of the mobility are in accord with the Gaussian disorder model. Best device efficiencies of the blue emitting materials are in the range of 2.9 cdA. The influence of the hole transport unit on charge transport and device efficiency is analyzed. The efficiency depends critically on the amount of the hole transport unit and decreases with increasing hole mobility.

Original languageEnglish (US)
Article number142109
JournalApplied Physics Letters
Issue number14
StatePublished - 2007
Externally publishedYes

Bibliographical note

Funding Information:
One of the authors (D.H.) would like to thank K. Meerholz for his support. Another author (F.L.) acknowledges G. Wegner for fruitful discussions and a Kekulé graduate scholarship of the Fonds der Chemischen Industrie. They are indebted to Merck OLED Materials GmbH for the polymers. Part of this work was supported by the Fonds der Chemischen Industrie and the BMBF OLAS under Project No. FKZ 13N8167.

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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