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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 11 — Jun. 1, 2012
  • pp: 2019–2021

Improving efficiency roll-off in phosphorescent OLEDs by modifying the exciton lifetime

Wenyu Ji, Letian Zhang, and Wenfa Xie  »View Author Affiliations

Optics Letters, Vol. 37, Issue 11, pp. 2019-2021 (2012)

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Studies on phosphorescent organic light emitting devices (PhOLEDs) with phosphorescent emitter, fac-tris (2-phenylpyridine) iridium (Ir(ppy)3), show that the lifetime of triplet exciton is modified by surface plasmon coupling of Au nanoparticles (NPs). Interactions between the triplet exciton and gold (Au) nanoparticles (NPs) lead to a decrease in the exciton lifetime and result in the spontaneous emission decay rate of triplet exciton faster as the distance between the phosphorescent material and the Au NPs becomes smaller. This interaction reduces the efficiency roll-off of Au NPs containing device. These results provide new guides for device design to improve efficiency performance.

© 2012 Optical Society of America

OCIS Codes
(050.2230) Diffraction and gratings : Fabry-Perot
(230.3670) Optical devices : Light-emitting diodes
(240.0310) Optics at surfaces : Thin films

ToC Category:
Optical Devices

Original Manuscript: March 14, 2012
Revised Manuscript: April 17, 2012
Manuscript Accepted: April 17, 2012
Published: May 30, 2012

Wenyu Ji, Letian Zhang, and Wenfa Xie, "Improving efficiency roll-off in phosphorescent OLEDs by modifying the exciton lifetime," Opt. Lett. 37, 2019-2021 (2012)

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