High efficiency organic electrophosphorescent devices

Mark E. Thompson, Sergey Lamansky, Peter Djurovich, Drew Murphy, Feras Abdel-Razzaq, Stephen R. Forrest, Marc Baldo, Paul E. Burrows, Chihaya Adachi, Theodore X. Zhou, Lech Michalski, Kamala Rajan, Julie J. Brown

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We have fabricated saturated red, orange, yellow and green OLEDs, utilizing phosphorescent dopants. Using phosphorescence based emitters we have eliminated the inherent 25% upper limit on emission observed for traditional fluorescence based systems. The quantum efficiencies of these devices are quite good, with measured external efficiencies > 15% and > 40 lum/W (green) in the best devices. The phosphorescent dopants in these devices are heavy metal containing molecules (i.e. Pt, and Ir), prepared as both metalloporphyrins and organometallic complexes. The high level of spin orbit coupling in these metal complexes gives efficient emission from triplet states. In addition to emission from the heavy metal dopant, it is possible to transfer the exciton energy to a fluorescent dye, by Förster energy transfer. The heavy metal dopant in this case acts as a sensitizer, utilizing both singlet and triplet excitons to efficiently pump a fluorescent dye. We discuss the important parameters in designing electrophosphorescent OLEDs as well as their strengths and limitations. Accelerated aging studies, on packaged devices, have shown that phosphorescence based OLEDs can have very long device lifetimes.

Original languageEnglish
Pages (from-to)119-124
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4105
DOIs
Publication statusPublished - Jan 1 2001
Externally publishedYes

Fingerprint

High Efficiency
Organic light emitting diodes (OLED)
Heavy Metals
Organic Light-emitting Diodes
Doping (additives)
Heavy metals
heavy metals
Phosphorescence
Fluorescent Dyes
Excitons
Exciton
phosphorescence
Dyes
Metalloporphyrins
dyes
excitons
Coordination Complexes
Spin-orbit Coupling
Organometallics
Metal complexes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Thompson, M. E., Lamansky, S., Djurovich, P., Murphy, D., Abdel-Razzaq, F., Forrest, S. R., ... Brown, J. J. (2001). High efficiency organic electrophosphorescent devices. Proceedings of SPIE - The International Society for Optical Engineering, 4105, 119-124. https://doi.org/10.1117/12.416884

High efficiency organic electrophosphorescent devices. / Thompson, Mark E.; Lamansky, Sergey; Djurovich, Peter; Murphy, Drew; Abdel-Razzaq, Feras; Forrest, Stephen R.; Baldo, Marc; Burrows, Paul E.; Adachi, Chihaya; Zhou, Theodore X.; Michalski, Lech; Rajan, Kamala; Brown, Julie J.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 4105, 01.01.2001, p. 119-124.

Research output: Contribution to journalArticle

Thompson, ME, Lamansky, S, Djurovich, P, Murphy, D, Abdel-Razzaq, F, Forrest, SR, Baldo, M, Burrows, PE, Adachi, C, Zhou, TX, Michalski, L, Rajan, K & Brown, JJ 2001, 'High efficiency organic electrophosphorescent devices', Proceedings of SPIE - The International Society for Optical Engineering, vol. 4105, pp. 119-124. https://doi.org/10.1117/12.416884
Thompson ME, Lamansky S, Djurovich P, Murphy D, Abdel-Razzaq F, Forrest SR et al. High efficiency organic electrophosphorescent devices. Proceedings of SPIE - The International Society for Optical Engineering. 2001 Jan 1;4105:119-124. https://doi.org/10.1117/12.416884
Thompson, Mark E. ; Lamansky, Sergey ; Djurovich, Peter ; Murphy, Drew ; Abdel-Razzaq, Feras ; Forrest, Stephen R. ; Baldo, Marc ; Burrows, Paul E. ; Adachi, Chihaya ; Zhou, Theodore X. ; Michalski, Lech ; Rajan, Kamala ; Brown, Julie J. / High efficiency organic electrophosphorescent devices. In: Proceedings of SPIE - The International Society for Optical Engineering. 2001 ; Vol. 4105. pp. 119-124.
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