Negative capacitance in organic light-emitting diodes

L. S.C. Pingree; B. J. Scott; M. T. Russell; T. J. Marks; M. C. Hersam

doi:10.1063/1.1865346

Negative capacitance in organic light-emitting diodes

L. S.C. Pingree, B. J. Scott, M. T. Russell, T. J. Marks, M. C. Hersam

Research output: Contribution to journal › Article › peer-review

94 Scopus citations

Abstract

Negative capacitance has been characterized in organic light-emitting diode (OLED) heterostructures using impedance spectroscopy. Although similar inductive behavior has been previously reported for transient electroluminescence in OLEDs, definitive identification of negative capacitance in impedance spectroscopy data has been elusive due to the high concentration of distributed traps at the anode-organic interface. The addition of a layer of 4,4′-bis[(p -trichlorosilylpropylphenyl)phenylamino]-biphenyl at this interface minimizes these trapping sites, thus enabling the inductive nature of charge transport in OLEDs to be directly observable. By quantitatively correlating the resulting impedance spectroscopy data with equivalent circuit models, a detailed description of charge transport in OLEDs as a function of heterostructure composition is developed.

Original language	English (US)
Article number	073509
Pages (from-to)	1-3
Number of pages	3
Journal	Applied Physics Letters
Volume	86
Issue number	7
DOIs	https://doi.org/10.1063/1.1865346
State	Published - Feb 14 2005

Funding

This work was supported by the NASA Institute for Nanoelectronics and Computing under Award No. NCC 2-1363 and the NSF under Award No. DMR-0134706. The authors also acknowledge the use of facilities supported by the Northwestern University MRSEC (NSF DMR-0076097).

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.1865346

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title = "Negative capacitance in organic light-emitting diodes",

abstract = "Negative capacitance has been characterized in organic light-emitting diode (OLED) heterostructures using impedance spectroscopy. Although similar inductive behavior has been previously reported for transient electroluminescence in OLEDs, definitive identification of negative capacitance in impedance spectroscopy data has been elusive due to the high concentration of distributed traps at the anode-organic interface. The addition of a layer of 4,4′-bis[(p -trichlorosilylpropylphenyl)phenylamino]-biphenyl at this interface minimizes these trapping sites, thus enabling the inductive nature of charge transport in OLEDs to be directly observable. By quantitatively correlating the resulting impedance spectroscopy data with equivalent circuit models, a detailed description of charge transport in OLEDs as a function of heterostructure composition is developed.",

author = "Pingree, {L. S.C.} and Scott, {B. J.} and Russell, {M. T.} and Marks, {T. J.} and Hersam, {M. C.}",

note = "Funding Information: This work was supported by the NASA Institute for Nanoelectronics and Computing under Award No. NCC 2-1363 and the NSF under Award No. DMR-0134706. The authors also acknowledge the use of facilities supported by the Northwestern University MRSEC (NSF DMR-0076097). ",

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AU - Scott, B. J.

AU - Russell, M. T.

AU - Marks, T. J.

AU - Hersam, M. C.

N1 - Funding Information: This work was supported by the NASA Institute for Nanoelectronics and Computing under Award No. NCC 2-1363 and the NSF under Award No. DMR-0134706. The authors also acknowledge the use of facilities supported by the Northwestern University MRSEC (NSF DMR-0076097).

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Y1 - 2005/2/14

N2 - Negative capacitance has been characterized in organic light-emitting diode (OLED) heterostructures using impedance spectroscopy. Although similar inductive behavior has been previously reported for transient electroluminescence in OLEDs, definitive identification of negative capacitance in impedance spectroscopy data has been elusive due to the high concentration of distributed traps at the anode-organic interface. The addition of a layer of 4,4′-bis[(p -trichlorosilylpropylphenyl)phenylamino]-biphenyl at this interface minimizes these trapping sites, thus enabling the inductive nature of charge transport in OLEDs to be directly observable. By quantitatively correlating the resulting impedance spectroscopy data with equivalent circuit models, a detailed description of charge transport in OLEDs as a function of heterostructure composition is developed.

AB - Negative capacitance has been characterized in organic light-emitting diode (OLED) heterostructures using impedance spectroscopy. Although similar inductive behavior has been previously reported for transient electroluminescence in OLEDs, definitive identification of negative capacitance in impedance spectroscopy data has been elusive due to the high concentration of distributed traps at the anode-organic interface. The addition of a layer of 4,4′-bis[(p -trichlorosilylpropylphenyl)phenylamino]-biphenyl at this interface minimizes these trapping sites, thus enabling the inductive nature of charge transport in OLEDs to be directly observable. By quantitatively correlating the resulting impedance spectroscopy data with equivalent circuit models, a detailed description of charge transport in OLEDs as a function of heterostructure composition is developed.

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Negative capacitance in organic light-emitting diodes

Abstract

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