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Issue 5, 2018
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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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Supplementary files

Article information


Submitted
09 Oct 2017
Accepted
29 Dec 2017
First published
01 Jan 2018

J. Mater. Chem. C, 2018,6, 1008-1014
Article type
Paper

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, 6, 1008
DOI: 10.1039/C7TC04599A

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