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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 24 — Nov. 23, 2009
  • pp: 21370–21375

Highly efficient organic light-emitting devices beyond theoretical prediction under high current density

Miaomiao Tian, Jinsong Luo, and Xingyuan Liu  »View Author Affiliations

Optics Express, Vol. 17, Issue 24, pp. 21370-21375 (2009)

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We develop a simple method to improve external quantum efficiencies (EQEs) of OLEDs under a wide range of current density. An insulating inorganic ultrathin layer (LiF) was sandwiched between exciton formation layer and electron transporting layer. A maximal EQE of 5.9% in a DCM based fluorescent OLED, which far exceeds the theoretical upper limit of 3.7%, was obtained under the current density of 487 mA/cm2 with a brightness maximum of 76740 cd/m2. The similar electroluminescence properties were also obtained in a C545T based green OLED using this method. The overall enhancement of EQE, and the nonlinear enhancement of EQE at high current density in these devices are attributed to the effect of electrical field on excitons.

© 2009 OSA

OCIS Codes
(160.4890) Materials : Organic materials
(230.3670) Optical devices : Light-emitting diodes

ToC Category:
Optical Devices

Original Manuscript: August 31, 2009
Revised Manuscript: October 16, 2009
Manuscript Accepted: October 28, 2009
Published: November 9, 2009

Miaomiao Tian, Jinsong Luo, and Xingyuan Liu, "Highly efficient organic light-emitting devices beyond theoretical prediction under high current density," Opt. Express 17, 21370-21375 (2009)

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