Issue 33, 2009
From the journal:

Journal of Materials Chemistry

A phosphine oxide derivative as a universal electron transport material for organic light-emitting diodes

Soon Ok Jeon,a   Kyoung Soo Yook,a   Chul Woong Jooa  and  Jun Yeob Lee*a  

* Corresponding authors

a Department of Polymer Science and Engineering, Dankook University, 126, Jukjeon-dong, Suji-gu, Yongin, Gyeonggi, Republic of Korea
E-mail: leej17@dankook.ac.kr
Fax: +82 31 8005 3585
Tel: +82 31 8005 3585

Abstract

A phosphine oxide based organic material, 2-diphenylphosphine oxide-spiro[fluorene-7,11′-benzofluorene] (SPPO2), was developed as a universal electron transport layer with a thermal stability and stable morphology for organic light-emitting diodes (OLEDs). The SPPO2 was synthesized by the reaction of 2-bromo-spiro[fluorene-7,11′-benzofluorene] with diphenyl phosphine chloride. SPPO2 showed a high glass transition temperature (Tg) of 118 °C and good film-forming properties. The SPPO2 reduced the driving voltage of the OLEDs irrespective of the energy level of the host materials due to efficient electron injection from the SPPO2 to host material. In particular, the SPPO2 reduced the driving voltage of the blue device of a wide bandgap host material by more than 3 V. Therefore, the SPPO2 can be used as a universal electron transport layer for OLEDs.

Graphical abstract: A phosphine oxide derivative as a universal electron transport material for organic light-emitting diodes

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Article information

DOI
https://doi.org/10.1039/B906088J
Article type
Paper
Submitted
26 Mar 2009
Accepted
04 Jun 2009
First published
30 Jun 2009

J. Mater. Chem., 2009,19, 5940-5944

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A phosphine oxide derivative as a universal electron transport material for organic light-emitting diodes

S. O. Jeon, K. S. Yook, C. W. Joo and J. Y. Lee, J. Mater. Chem., 2009, 19, 5940 DOI: 10.1039/B906088J

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