Impedance spectroscopy of OLEDs as a tool for estimating mobility and the concentration of charge carriers in transport layers†,Journal of Materials Chemistry C

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Impedance spectroscopy of OLEDs as a tool for estimating mobility and the concentration of charge carriers in transport layers†
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2018-01-01 00:00:00 , DOI: 10.1039/c7tc04599a
P. Chulkin _{1,

2,

3} , O. Vybornyi _{4,

5,

6,

7,

8} , M. Lapkowski _{1,

2,

3,

9,

10} , P. J. Skabara _{4,

5,

6,

7,

8} , P. Data _{1,

2,

3,

9,

10}

Affiliation

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.

中文翻译：

OLED的阻抗谱作为估计迁移率和传输层中电荷载流子浓度的工具†

本文介绍了一种基于阻抗谱的新颖技术，旨在在工作期间表征有机发光二极管（OLED）。许多基于NPB（N，N'-二（1-萘基）-N，N'-二苯基-（1,1'-联苯）-4,4'-二胺）和TPBi（2,2' ，2''-（1,3,5-苯并三基）-三（1-苯基-1- H-苯并咪唑））导电层，CBP（4,4'-双（N-咔唑基）-1,1'-联苯）和BPTZ-DBTO2（3,6-双（10 H-吩噻嗪-10-基）-9 H-芴-[二苯并噻吩-S，S-二氧化物]）作为发射体以验证该方法为例。使用等效电路，分别确定和分析空穴（HTL）和电子传输（ETL）层的电容和电导率值。这些参数以及电流-电压特性用于计算（i）两种电荷载流子的迁移率（μ，cm ² V ^-1 s ^-1），（ii）电荷密度（n，cm ^-3）电荷载流子的电荷强度，以及（iii）两个传输层中的电场强度（E，V m ^-1）作为施加电压的函数。

更新日期：2018-01-01

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