Electrophosphorescent organic light emitting diodes

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

研究成果: Contribution to journalConference article査読

1 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)337-340
ページ数4
ジャーナルSID Conference Record of the International Display Research Conference
出版ステータス出版済み - 2000
外部発表はい
イベント20th International Display Research Conference - Palm Beach, FL, 米国
継続期間: 9 25 20009 28 2000

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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