High power efficiency solution-processed double-layer blue phosphorescent organic light-emitting diode by controlling charge transport at the emissive layer and heterojunction

Yeoh, K.H. and Ng, C.Y.B. and Chua, C.L. and Talik, N.A. and Woon, K.L. (2013) High power efficiency solution-processed double-layer blue phosphorescent organic light-emitting diode by controlling charge transport at the emissive layer and heterojunction. physica status solidi (RRL) - Rapid Research Letters, 7 (6). pp. 421-424. ISSN 1862-6254, DOI https://doi.org/10.1002/pssr.201307089.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/pssr.20...

Abstract

We have demonstrated an effective method of enhancing the power efficiency of double–emissive solution-processed blue phosphorescent organic light-emitting diode (PHOLED) by controlling the charge transport in the heterojunction and emissive layer. The first emissive layer consists of poly(vinylcarbazole) (PVK) and bis(4,6 difluorophenylpyridinato-N,C2)picolinatoiridium (FIrpic) mixed with 4,4′,4″-tris(N-carbazolyl)-triphenylamine (TCTA) or 1,3-bis[(4-tert- butylphenyl)-1,3,4 oxidiazolyl] phenylene (OXD-7). The second layer consists of an alcohol-soluble 2,7-bis(diphenylphosphoryl)-9,9′-spirobi[fluorene] (SPPO13) and FIrpic blend. The incorporation of OXD-7 into PVK blurs the interface between the emissive layers and widens the recombination zone while blending TCTA into PVK reduces the hole- injection barrier from PEDOT:PSS to PVK. By adding TCTA or OXD-7 into the first emissive layer, we have achieved a power efficiency of 10 lm/W and 11 lm/W, respectively, at 1000 cd/m2.

Item Type: Article
Funders: UNSPECIFIED
Uncontrolled Keywords: Heterojunctions; PHOLED; Blurring effect; Power efficiency
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Divisions: Faculty of Science > Department of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 10 Mar 2015 04:43
Last Modified: 10 Mar 2015 04:43
URI: http://eprints.um.edu.my/id/eprint/12977

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