Role of traps in polymer-based light-emitting devices

A. V. Yakimov; V. N. Savvate'ev; D. Davidov

doi:10.1016/S0379-6779(00)00300-3

Role of traps in polymer-based light-emitting devices

A. V. Yakimov^*, V. N. Savvate'ev, D. Davidov

^*Corresponding author for this work

Racah Institute of Physics

Research output: Contribution to journal › Conference article › peer-review

18 Scopus citations

Abstract

We describe `injectionless' electroluminescence (EL) mechanism in organic light-emitting diodes (LED) based on `thick' films of poly-(phenylene vinylene) (PPV) and poly-[2-methoxy-5-(2-ethylhexoxy)-1,4-phenylene vinylene] (MEH-PPV) sandwiched between ITO and Al electrodes. We provide evidence that this mechanism is associated with detrapping of charge carriers from `shallow' traps. A pump-probe experiment allows an estimate of the trapping-detrapping time scale. This time scale suggests the location of trap levels at 0.15 eV above the HOMO band. We also demonstrate spatially-resolved EL enhancement in thin film devices that can be achieved by simultaneous illumination and biasing the device. We attribute the EL enhancement to charging of traps located near Al/polymer interface. Slow temporal decay of the EL enhancement corresponds to charge release process from `deep' (0.8 eV) traps.

Original language	English
Pages (from-to)	51-56
Number of pages	6
Journal	Synthetic Metals
Volume	115
Issue number	1
DOIs	https://doi.org/10.1016/S0379-6779(00)00300-3
State	Published - 1 Nov 2000
Event	Proccedings of the European Materials Research Society 1999 Spring Meeting, Symposium N: Molecular Photonics at the Interface of Physics, Chemistry and Biology - Strasbourg, France Duration: 1 Jun 1999 → 4 Jun 1999

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title = "Role of traps in polymer-based light-emitting devices",

abstract = "We describe `injectionless' electroluminescence (EL) mechanism in organic light-emitting diodes (LED) based on `thick' films of poly-(phenylene vinylene) (PPV) and poly-[2-methoxy-5-(2-ethylhexoxy)-1,4-phenylene vinylene] (MEH-PPV) sandwiched between ITO and Al electrodes. We provide evidence that this mechanism is associated with detrapping of charge carriers from `shallow' traps. A pump-probe experiment allows an estimate of the trapping-detrapping time scale. This time scale suggests the location of trap levels at 0.15 eV above the HOMO band. We also demonstrate spatially-resolved EL enhancement in thin film devices that can be achieved by simultaneous illumination and biasing the device. We attribute the EL enhancement to charging of traps located near Al/polymer interface. Slow temporal decay of the EL enhancement corresponds to charge release process from `deep' (0.8 eV) traps.",

author = "Yakimov, {A. V.} and Savvate'ev, {V. N.} and D. Davidov",

year = "2000",

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AU - Yakimov, A. V.

AU - Savvate'ev, V. N.

AU - Davidov, D.

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Y1 - 2000/11/1

N2 - We describe `injectionless' electroluminescence (EL) mechanism in organic light-emitting diodes (LED) based on `thick' films of poly-(phenylene vinylene) (PPV) and poly-[2-methoxy-5-(2-ethylhexoxy)-1,4-phenylene vinylene] (MEH-PPV) sandwiched between ITO and Al electrodes. We provide evidence that this mechanism is associated with detrapping of charge carriers from `shallow' traps. A pump-probe experiment allows an estimate of the trapping-detrapping time scale. This time scale suggests the location of trap levels at 0.15 eV above the HOMO band. We also demonstrate spatially-resolved EL enhancement in thin film devices that can be achieved by simultaneous illumination and biasing the device. We attribute the EL enhancement to charging of traps located near Al/polymer interface. Slow temporal decay of the EL enhancement corresponds to charge release process from `deep' (0.8 eV) traps.

AB - We describe `injectionless' electroluminescence (EL) mechanism in organic light-emitting diodes (LED) based on `thick' films of poly-(phenylene vinylene) (PPV) and poly-[2-methoxy-5-(2-ethylhexoxy)-1,4-phenylene vinylene] (MEH-PPV) sandwiched between ITO and Al electrodes. We provide evidence that this mechanism is associated with detrapping of charge carriers from `shallow' traps. A pump-probe experiment allows an estimate of the trapping-detrapping time scale. This time scale suggests the location of trap levels at 0.15 eV above the HOMO band. We also demonstrate spatially-resolved EL enhancement in thin film devices that can be achieved by simultaneous illumination and biasing the device. We attribute the EL enhancement to charging of traps located near Al/polymer interface. Slow temporal decay of the EL enhancement corresponds to charge release process from `deep' (0.8 eV) traps.

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Y2 - 1 June 1999 through 4 June 1999

ER -

Role of traps in polymer-based light-emitting devices

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