Space-charge limited current and electroluminescence in conjugated polymer-based LEDs

V. N. Savvate'ev; M. Tarabia; H. Chayet; E. Z. Farragi; G. B. Cohen; S. Kirstein; D. Davidov; Y. Avny; R. Neumann

doi:10.1016/s0379-6779(97)80235-4

Space-charge limited current and electroluminescence in conjugated polymer-based LEDs

V. N. Savvate'ev^*, M. Tarabia, H. Chayet, E. Z. Farragi, G. B. Cohen, S. Kirstein, D. Davidov, Y. Avny, R. Neumann

^*Corresponding author for this work

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

25 Scopus citations

Abstract

We have studied the current versus voltage (I-V) and the luminescence versus voltage (EL-V) characteristics in PPV-based LED devices for different film thickness, d. For voltages below the EL threshold voltage, the I-V curves exhibit a linear regime (I∼V) at low voltages and quadratic (I∼V²) regime for higher voltages. The later is attributed to the space charge limited current mechanism assuming a single shallow trap level. The fit of the model to the experimental results is very good with a single fitting parameter, namely, the effective mobility. The extracted mobilities are compared to those measured independently by time-of-flight (TOF) photoconductivity. The SCLC model gives a reasonable explanation for the voltage threshold in EL.

Original language	English
Pages (from-to)	1269-1270
Number of pages	2
Journal	Synthetic Metals
Volume	85
Issue number	1-3
DOIs	https://doi.org/10.1016/s0379-6779(97)80235-4
State	Published - 15 Mar 1997

Keywords

Light sources
Poly(phenylene vinylene)
Transport Measurements

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10.1016/s0379-6779(97)80235-4

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title = "Space-charge limited current and electroluminescence in conjugated polymer-based LEDs",

abstract = "We have studied the current versus voltage (I-V) and the luminescence versus voltage (EL-V) characteristics in PPV-based LED devices for different film thickness, d. For voltages below the EL threshold voltage, the I-V curves exhibit a linear regime (I∼V) at low voltages and quadratic (I∼V2) regime for higher voltages. The later is attributed to the space charge limited current mechanism assuming a single shallow trap level. The fit of the model to the experimental results is very good with a single fitting parameter, namely, the effective mobility. The extracted mobilities are compared to those measured independently by time-of-flight (TOF) photoconductivity. The SCLC model gives a reasonable explanation for the voltage threshold in EL.",

keywords = "Light sources, Poly(phenylene vinylene), Transport Measurements",

author = "Savvate'ev, {V. N.} and M. Tarabia and H. Chayet and Farragi, {E. Z.} and Cohen, {G. B.} and S. Kirstein and D. Davidov and Y. Avny and R. Neumann",

year = "1997",

month = mar,

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doi = "10.1016/s0379-6779(97)80235-4",

language = "אנגלית",

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TY - JOUR

T1 - Space-charge limited current and electroluminescence in conjugated polymer-based LEDs

AU - Savvate'ev, V. N.

AU - Tarabia, M.

AU - Chayet, H.

AU - Farragi, E. Z.

AU - Cohen, G. B.

AU - Kirstein, S.

AU - Davidov, D.

AU - Avny, Y.

AU - Neumann, R.

PY - 1997/3/15

Y1 - 1997/3/15

N2 - We have studied the current versus voltage (I-V) and the luminescence versus voltage (EL-V) characteristics in PPV-based LED devices for different film thickness, d. For voltages below the EL threshold voltage, the I-V curves exhibit a linear regime (I∼V) at low voltages and quadratic (I∼V2) regime for higher voltages. The later is attributed to the space charge limited current mechanism assuming a single shallow trap level. The fit of the model to the experimental results is very good with a single fitting parameter, namely, the effective mobility. The extracted mobilities are compared to those measured independently by time-of-flight (TOF) photoconductivity. The SCLC model gives a reasonable explanation for the voltage threshold in EL.

AB - We have studied the current versus voltage (I-V) and the luminescence versus voltage (EL-V) characteristics in PPV-based LED devices for different film thickness, d. For voltages below the EL threshold voltage, the I-V curves exhibit a linear regime (I∼V) at low voltages and quadratic (I∼V2) regime for higher voltages. The later is attributed to the space charge limited current mechanism assuming a single shallow trap level. The fit of the model to the experimental results is very good with a single fitting parameter, namely, the effective mobility. The extracted mobilities are compared to those measured independently by time-of-flight (TOF) photoconductivity. The SCLC model gives a reasonable explanation for the voltage threshold in EL.

KW - Light sources

KW - Poly(phenylene vinylene)

KW - Transport Measurements

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JO - Synthetic Metals

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Space-charge limited current and electroluminescence in conjugated polymer-based LEDs

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Keywords

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