Effect of the layer thickness on the efficiency enhancement in bilayer polymer light-emitting diodes

Davood Abbaszadeh; Nutifafa Y. Doumon; Gert-Jan A.H. Wetzelaer; L. Jan Anton Koster; Paul W.M. Blom

doi:10.1016/j.synthmet.2016.02.003

Effect of the layer thickness on the efficiency enhancement in bilayer polymer light-emitting diodes

Davood Abbaszadeh^*, Nutifafa Y. Doumon, Gert-Jan A.H. Wetzelaer, L. Jan Anton Koster, Paul W.M. Blom

^*Corresponding author for this work

Photophysics and OptoElectronics

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

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Abstract

To eliminate quenching of excitons at the metallic cathode of a polymer light-emitting diode (PLED) the emitting layer is separated from the cathode by a hole-blocking layer (HBL). We investigate a wide range of single-layer and bilayer PLEDs with different thicknesses consisting of a poly[2-methoxy-5-(2'-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV) emitting layer and a 20 nm poly(9,9'-dioctylfluorene) (PFO) HBL. The highest efficiency for both single-layer and bilayer devices is achieved when the total polymer layer thickness is similar to 90 nm. As a result, addition of an HBL to reduce cathode quenching is only effective when the luminescence enhancement due to microcavity effects in PLEDs is restored. The relative efficiency enhancement in bilayer devices as compared to single-layer devices varies from 283% for a 30 nm active layer to 20% for a 250 nm device. (C) 2016 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	64-67
Number of pages	4
Journal	Synthetic Metals
Volume	215
DOIs	https://doi.org/10.1016/j.synthmet.2016.02.003
Publication status	Published - May-2016

Keywords

Single- and bilayer PLEDs

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Effect of the layer thickness on the efficiency enhancement in bilayer polymer light-emitting diodesFinal publisher's version, 525 KBLicence: Taverne

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@article{cb5ad78ba2034cba822474b76ac2db96,

title = "Effect of the layer thickness on the efficiency enhancement in bilayer polymer light-emitting diodes",

abstract = "To eliminate quenching of excitons at the metallic cathode of a polymer light-emitting diode (PLED) the emitting layer is separated from the cathode by a hole-blocking layer (HBL). We investigate a wide range of single-layer and bilayer PLEDs with different thicknesses consisting of a poly[2-methoxy-5-(2'-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV) emitting layer and a 20 nm poly(9,9'-dioctylfluorene) (PFO) HBL. The highest efficiency for both single-layer and bilayer devices is achieved when the total polymer layer thickness is similar to 90 nm. As a result, addition of an HBL to reduce cathode quenching is only effective when the luminescence enhancement due to microcavity effects in PLEDs is restored. The relative efficiency enhancement in bilayer devices as compared to single-layer devices varies from 283% for a 30 nm active layer to 20% for a 250 nm device. (C) 2016 Elsevier B.V. All rights reserved.",

keywords = "Single- and bilayer PLEDs",

author = "Davood Abbaszadeh and Doumon, {Nutifafa Y.} and Wetzelaer, {Gert-Jan A.H.} and Koster, {L. Jan Anton} and Blom, {Paul W.M.}",

year = "2016",

month = may,

doi = "10.1016/j.synthmet.2016.02.003",

language = "English",

volume = "215",

pages = "64--67",

journal = "Synthetic Metals",

issn = "0379-6779",

publisher = "Elsevier Science",

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TY - JOUR

T1 - Effect of the layer thickness on the efficiency enhancement in bilayer polymer light-emitting diodes

AU - Abbaszadeh, Davood

AU - Doumon, Nutifafa Y.

AU - Wetzelaer, Gert-Jan A.H.

AU - Koster, L. Jan Anton

AU - Blom, Paul W.M.

PY - 2016/5

Y1 - 2016/5

N2 - To eliminate quenching of excitons at the metallic cathode of a polymer light-emitting diode (PLED) the emitting layer is separated from the cathode by a hole-blocking layer (HBL). We investigate a wide range of single-layer and bilayer PLEDs with different thicknesses consisting of a poly[2-methoxy-5-(2'-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV) emitting layer and a 20 nm poly(9,9'-dioctylfluorene) (PFO) HBL. The highest efficiency for both single-layer and bilayer devices is achieved when the total polymer layer thickness is similar to 90 nm. As a result, addition of an HBL to reduce cathode quenching is only effective when the luminescence enhancement due to microcavity effects in PLEDs is restored. The relative efficiency enhancement in bilayer devices as compared to single-layer devices varies from 283% for a 30 nm active layer to 20% for a 250 nm device. (C) 2016 Elsevier B.V. All rights reserved.

AB - To eliminate quenching of excitons at the metallic cathode of a polymer light-emitting diode (PLED) the emitting layer is separated from the cathode by a hole-blocking layer (HBL). We investigate a wide range of single-layer and bilayer PLEDs with different thicknesses consisting of a poly[2-methoxy-5-(2'-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV) emitting layer and a 20 nm poly(9,9'-dioctylfluorene) (PFO) HBL. The highest efficiency for both single-layer and bilayer devices is achieved when the total polymer layer thickness is similar to 90 nm. As a result, addition of an HBL to reduce cathode quenching is only effective when the luminescence enhancement due to microcavity effects in PLEDs is restored. The relative efficiency enhancement in bilayer devices as compared to single-layer devices varies from 283% for a 30 nm active layer to 20% for a 250 nm device. (C) 2016 Elsevier B.V. All rights reserved.

KW - Single- and bilayer PLEDs

U2 - 10.1016/j.synthmet.2016.02.003

DO - 10.1016/j.synthmet.2016.02.003

M3 - Article

SN - 0379-6779

VL - 215

SP - 64

EP - 67

JO - Synthetic Metals

JF - Synthetic Metals

ER -

Effect of the layer thickness on the efficiency enhancement in bilayer polymer light-emitting diodes

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Keywords

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