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Impedance spectroscopy of OLEDs as a tool for estimating mobility and the concentration of charge carriers in transport layers

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Abstract

The article presents a novel impedance spectroscopy based technique designed to characterise organic light emitting diodes (OLED) during operation. A number of devices based on NPB (N,N′-di(1-naphthyl)-N,N′-diphenyl-(1,1′-biphenyl)-4,4′-diamine) and TPBi (2,2′,2′′-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole)) conducting layers, CBP (4,4′-bis(N-carbazolyl)-1,1′-biphenyl) as a host and BPTZ-DBTO2 (3,6-bis(10H-phenothiazine-10-yl)-9H-fluorene-[dibenzothiophene-S,S-dioxide]) as an emitter were taken as an example to validate the method. Using equivalent electrical circuits, values of capacitance and conductivity of both hole- (HTL) and electron-transport (ETL) layers were determined and analysed separately. Those parameters, as well as current–voltage characteristics, were used to calculate (i) mobility (μ, cm2 V−1 s−1) of both types of charge carriers, (ii) charge density (n, cm−3) of the charge carriers, and (iii) electric field intensity (E, V m−1) in both transport layers as functions of the applied voltage.

Graphical abstract: Impedance spectroscopy of OLEDs as a tool for estimating mobility and the concentration of charge carriers in transport layers

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Publication details

The article was received on 09 Oct 2017, accepted on 29 Dec 2017 and first published on 01 Jan 2018


Article type: Paper
DOI: 10.1039/C7TC04599A
Citation: J. Mater. Chem. C, 2018, Advance Article
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    Impedance spectroscopy of OLEDs as a tool for estimating mobility and the concentration of charge carriers in transport layers

    P. Chulkin, O. Vybornyi, M. Lapkowski, P. J. Skabara and P. Data, J. Mater. Chem. C, 2018, Advance Article , DOI: 10.1039/C7TC04599A

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