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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 3 — Feb. 7, 2005
  • pp: 937–941

Transparent organic light-emitting devices with LiF/Mg:Ag cathode

B. J. Chen, X. W. Sun, and S. C. Tan  »View Author Affiliations

Optics Express, Vol. 13, Issue 3, pp. 937-941 (2005)

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Transparent organic light-emitting devices (TOLED) based on a stacked transparent cathode of a LiF/Mg:Ag were investigated. The device has a structure of indium-tin-oxide (ITO)/N, N’-diphenyl-N, N’-(3-methylphenyl)-1,1’-biphenyl-4,4’-diamine (TPD) (90 nm)/tris-(8-hydroxyquinoline) aluminum (Alq3) (80 nm)/LiF (0.5 nm)/Mg:Ag (20 nm)/Alq3 (50 nm), where the transparent capping layer of 50 nm Alq3 acts as refractive index matching layer to optimize optical output. The turn-on voltage of the device is as low as 2.8 V. The device also shows high optical transparency and low reflectivity in the visible region, approximately 40% of light can emit from the top cathode side and 60% of the light from bottom ITO glass. At injection current density of 20 mA/cm2, the current efficiency, for bottom emission from ITO anode side and top emission from metal cathode side, is 3.4 cd/A and 2.2 cd/A, respectively. The lower turn-on voltage and higher efficiency of device are due to enhancing electron injection by using LiF/Mg:Ag cathode.

© 2005 Optical Society of America

OCIS Codes
(160.4890) Materials : Organic materials
(230.3670) Optical devices : Light-emitting diodes
(310.6860) Thin films : Thin films, optical properties

ToC Category:
Research Papers

Original Manuscript: December 16, 2004
Revised Manuscript: January 27, 2005
Published: February 7, 2005

B. Chen, X. W. Sun, and S. Tan, "Transparent organic light-emitting devices with LiF/Mg:Ag cathode," Opt. Express 13, 937-941 (2005)

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