The efficiency enhancement of single-layer solution-processed blue phosphorescent organic light emitting diodes by hole injection layer modification

Yeoh, K.H. and Talik, N.A. and Whitcher, T.J. and Ng, C.Y.B. and Woon, K.L. (2014) The efficiency enhancement of single-layer solution-processed blue phosphorescent organic light emitting diodes by hole injection layer modification. Journal of Physics D: Applied Physics, 47 (205103). pp. 1-6. ISSN 0022-3727

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Official URL: http://iopscience.iop.org/0022-3727/47/20/205103/a...

Abstract

Poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) PEDOT : PSS is extensively used as a hole injection layer (HIL) in solution-processed organic light emitting diodes (OLEDs). The high work function of a HIL is crucial in improving OLED efficiency. The work function of PEDOT : PSS is usually around 5.1–5.3 eV. By adding perfluorinated ionomer (PFI), the work function of PEDOT : PSS has been reported to reach as high as 5.95 eV. We investigated the effects of PFI-modified PEDOT : PSS in a single-layer solution-processed blue phosphorescent OLED (PHOLED). We observed that high concentrations of a PFI in PEDOT : PSS has detrimental effects on the device efficiency due to the low conductivity of the PFI. Using this approach, blue PHOLEDs with efficiencies of 9.4 lm W−1 (18.2 cd A−1) and 7.9 lm W−1 (20.4 cd A−1) at 100 cd m−2 and 1000 cd m−2, respectively, were demonstrated.

Item Type: Article
Uncontrolled Keywords: Perfluorinated ionomer; PEDOT:PSS; Blue organic light emitting diode (OLED); Solution-processed method
Subjects: Q Science > Q Science (General)
Divisions: Faculty of Science
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 10 Mar 2015 07:23
Last Modified: 10 Mar 2015 07:23
URI: http://eprints.um.edu.my/id/eprint/12989

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