Effects of insulating layers on the performance of organic electroluminescent devices

Ghassan E. Jabbour, Rudy Schlaf, Neal R Armstrong, Bernard Kippelen, Nasser N Peyghambarian

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In this paper, we demonstrate the enhancement in the performance of organic electroluminescent devices upon the insertion of an insulating layer or layers of LiF in the device structure. Highly efficient and bright organic light-emitting devices were fabricated with this approach. External quantum efficiencies approaching 3 % and light output exceeding 45,000 cd/m2 have been achieved for green light-emitting devices with Al cathode. This technique can be extended to fabricate efficient blue and sharp-red light-emitting devices. In this respect, using Al as the electron injecting electrode, blue light-emitting devices with external quantum efficiency of 1.4% and light output more than 4,000 cd/m2 have been achieved without the use of dopants. For sharp-red light-emitting devices, record efficiency and light output were obtained when LiF was used. Devices without the LiF layer showed light output levels lower than 5 cd/m2, whereas, with the insertion of LiF before the cathode, the external quantum efficiency exceeded 1% and light output was higher than 320 cd/m2. All of these devices had lower operational voltage than similar devices without the LiF layer. Preliminary UPS-XPS results revealed a sharp decrease in the work function of aluminum upon the deposition of sub-monolayer of LiF. Although, the use of the LiF layer on the indium-tin-oxide anode showed some enhancement in device performance, the contribution to device performance is lower than the case with the same insulator deposited at the cathode side, indicating that the cathode is more problematic than the hole injecting indium-tin-oxide electrode.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsB Kippelen, D.D.C. Bradley
Pages182-190
Number of pages9
Volume3281
DOIs
StatePublished - 1998
EventPolymer Photonic Devices - San Jose, CA, United States
Duration: Jan 28 1998Jan 30 1998

Other

OtherPolymer Photonic Devices
CountryUnited States
CitySan Jose, CA
Period1/28/981/30/98

Fingerprint

Luminescent devices
Cathodes
Quantum efficiency
cathodes
output
quantum efficiency
Tin oxides
Indium
indium oxides
tin oxides
insertion
Electrodes
electrodes
augmentation
Monolayers
Anodes
X ray photoelectron spectroscopy
Doping (additives)
anodes
Aluminum

Keywords

  • Displays
  • Electroluminescence
  • Insulating layer
  • Lithium fluoride
  • Luminance
  • Organic light-emitting devices
  • Quantum efficiency

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Jabbour, G. E., Schlaf, R., Armstrong, N. R., Kippelen, B., & Peyghambarian, N. N. (1998). Effects of insulating layers on the performance of organic electroluminescent devices. In B. Kippelen, & D. D. C. Bradley (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 3281, pp. 182-190) https://doi.org/10.1117/12.305420

Effects of insulating layers on the performance of organic electroluminescent devices. / Jabbour, Ghassan E.; Schlaf, Rudy; Armstrong, Neal R; Kippelen, Bernard; Peyghambarian, Nasser N.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / B Kippelen; D.D.C. Bradley. Vol. 3281 1998. p. 182-190.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Jabbour, GE, Schlaf, R, Armstrong, NR, Kippelen, B & Peyghambarian, NN 1998, Effects of insulating layers on the performance of organic electroluminescent devices. in B Kippelen & DDC Bradley (eds), Proceedings of SPIE - The International Society for Optical Engineering. vol. 3281, pp. 182-190, Polymer Photonic Devices, San Jose, CA, United States, 1/28/98. https://doi.org/10.1117/12.305420
Jabbour GE, Schlaf R, Armstrong NR, Kippelen B, Peyghambarian NN. Effects of insulating layers on the performance of organic electroluminescent devices. In Kippelen B, Bradley DDC, editors, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3281. 1998. p. 182-190 https://doi.org/10.1117/12.305420
Jabbour, Ghassan E. ; Schlaf, Rudy ; Armstrong, Neal R ; Kippelen, Bernard ; Peyghambarian, Nasser N. / Effects of insulating layers on the performance of organic electroluminescent devices. Proceedings of SPIE - The International Society for Optical Engineering. editor / B Kippelen ; D.D.C. Bradley. Vol. 3281 1998. pp. 182-190
@inproceedings{8ea30c87faf548b7821cb1611e4e17b6,
title = "Effects of insulating layers on the performance of organic electroluminescent devices",
abstract = "In this paper, we demonstrate the enhancement in the performance of organic electroluminescent devices upon the insertion of an insulating layer or layers of LiF in the device structure. Highly efficient and bright organic light-emitting devices were fabricated with this approach. External quantum efficiencies approaching 3 {\%} and light output exceeding 45,000 cd/m2 have been achieved for green light-emitting devices with Al cathode. This technique can be extended to fabricate efficient blue and sharp-red light-emitting devices. In this respect, using Al as the electron injecting electrode, blue light-emitting devices with external quantum efficiency of 1.4{\%} and light output more than 4,000 cd/m2 have been achieved without the use of dopants. For sharp-red light-emitting devices, record efficiency and light output were obtained when LiF was used. Devices without the LiF layer showed light output levels lower than 5 cd/m2, whereas, with the insertion of LiF before the cathode, the external quantum efficiency exceeded 1{\%} and light output was higher than 320 cd/m2. All of these devices had lower operational voltage than similar devices without the LiF layer. Preliminary UPS-XPS results revealed a sharp decrease in the work function of aluminum upon the deposition of sub-monolayer of LiF. Although, the use of the LiF layer on the indium-tin-oxide anode showed some enhancement in device performance, the contribution to device performance is lower than the case with the same insulator deposited at the cathode side, indicating that the cathode is more problematic than the hole injecting indium-tin-oxide electrode.",
keywords = "Displays, Electroluminescence, Insulating layer, Lithium fluoride, Luminance, Organic light-emitting devices, Quantum efficiency",
author = "Jabbour, {Ghassan E.} and Rudy Schlaf and Armstrong, {Neal R} and Bernard Kippelen and Peyghambarian, {Nasser N}",
year = "1998",
doi = "10.1117/12.305420",
language = "English (US)",
volume = "3281",
pages = "182--190",
editor = "B Kippelen and D.D.C. Bradley",
booktitle = "Proceedings of SPIE - The International Society for Optical Engineering",

}

TY - GEN

T1 - Effects of insulating layers on the performance of organic electroluminescent devices

AU - Jabbour, Ghassan E.

AU - Schlaf, Rudy

AU - Armstrong, Neal R

AU - Kippelen, Bernard

AU - Peyghambarian, Nasser N

PY - 1998

Y1 - 1998

N2 - In this paper, we demonstrate the enhancement in the performance of organic electroluminescent devices upon the insertion of an insulating layer or layers of LiF in the device structure. Highly efficient and bright organic light-emitting devices were fabricated with this approach. External quantum efficiencies approaching 3 % and light output exceeding 45,000 cd/m2 have been achieved for green light-emitting devices with Al cathode. This technique can be extended to fabricate efficient blue and sharp-red light-emitting devices. In this respect, using Al as the electron injecting electrode, blue light-emitting devices with external quantum efficiency of 1.4% and light output more than 4,000 cd/m2 have been achieved without the use of dopants. For sharp-red light-emitting devices, record efficiency and light output were obtained when LiF was used. Devices without the LiF layer showed light output levels lower than 5 cd/m2, whereas, with the insertion of LiF before the cathode, the external quantum efficiency exceeded 1% and light output was higher than 320 cd/m2. All of these devices had lower operational voltage than similar devices without the LiF layer. Preliminary UPS-XPS results revealed a sharp decrease in the work function of aluminum upon the deposition of sub-monolayer of LiF. Although, the use of the LiF layer on the indium-tin-oxide anode showed some enhancement in device performance, the contribution to device performance is lower than the case with the same insulator deposited at the cathode side, indicating that the cathode is more problematic than the hole injecting indium-tin-oxide electrode.

AB - In this paper, we demonstrate the enhancement in the performance of organic electroluminescent devices upon the insertion of an insulating layer or layers of LiF in the device structure. Highly efficient and bright organic light-emitting devices were fabricated with this approach. External quantum efficiencies approaching 3 % and light output exceeding 45,000 cd/m2 have been achieved for green light-emitting devices with Al cathode. This technique can be extended to fabricate efficient blue and sharp-red light-emitting devices. In this respect, using Al as the electron injecting electrode, blue light-emitting devices with external quantum efficiency of 1.4% and light output more than 4,000 cd/m2 have been achieved without the use of dopants. For sharp-red light-emitting devices, record efficiency and light output were obtained when LiF was used. Devices without the LiF layer showed light output levels lower than 5 cd/m2, whereas, with the insertion of LiF before the cathode, the external quantum efficiency exceeded 1% and light output was higher than 320 cd/m2. All of these devices had lower operational voltage than similar devices without the LiF layer. Preliminary UPS-XPS results revealed a sharp decrease in the work function of aluminum upon the deposition of sub-monolayer of LiF. Although, the use of the LiF layer on the indium-tin-oxide anode showed some enhancement in device performance, the contribution to device performance is lower than the case with the same insulator deposited at the cathode side, indicating that the cathode is more problematic than the hole injecting indium-tin-oxide electrode.

KW - Displays

KW - Electroluminescence

KW - Insulating layer

KW - Lithium fluoride

KW - Luminance

KW - Organic light-emitting devices

KW - Quantum efficiency

UR - http://www.scopus.com/inward/record.url?scp=0032225754&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032225754&partnerID=8YFLogxK

U2 - 10.1117/12.305420

DO - 10.1117/12.305420

M3 - Conference contribution

AN - SCOPUS:0032225754

VL - 3281

SP - 182

EP - 190

BT - Proceedings of SPIE - The International Society for Optical Engineering

A2 - Kippelen, B

A2 - Bradley, D.D.C.

ER -