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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 28 — Dec. 31, 2012
  • pp: 29252–29259

Experimental optimization of the optical and electrical properties of a half-wavelength-thick organic hetero-structure in a Micro-cavity

A. Coens, M. Chakaroun, A. P. A. Fischer, M. W. Lee, A. Boudrioua, B. Geffroy, and G. Vemuri  »View Author Affiliations

Optics Express, Vol. 20, Issue 28, pp. 29252-29259 (2012)

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In the context of progress towards the organic laser diode, we experimentally investigate the optical and electrical optimization of an OLED in a vertical λ/2 microcavity. The microcavity consists of a quarter-wavelength TiO2/SiO2 multilayer mirror, a half-wavelength-thick OLED and a semitransparent aluminum cathode. The Alq3/DCM2 guest-host system is used as the emitting layer. This study focuses on the design and the fabrication of a half-wavelength thick organic hetero-structure exhibiting a high current density despite both the thickness increase and the cathode thickness reduction. The emission wavelength, the line-width narrowing and the current-density are studied as a function of two key parameters: the hetero-structure optical thickness and the aluminum cathode thickness. The experimental results show that a 125 nm thick cavity OLED ended by a 20 nm thick aluminum cathode exhibits a resonance at 606 nm with a full width at half maximum of 11 nm, and with current-densities exceeding 0.5 A/cm2. We show that even without a top high-quality-mirror the incomplete microcavity λ/2 OLED hetero-structure exhibits a clear modification of the spontaneous emission at normal incidence.

© 2012 OSA

OCIS Codes
(160.4890) Materials : Organic materials
(250.3680) Optoelectronics : Light-emitting polymers
(140.3945) Lasers and laser optics : Microcavities

ToC Category:

Original Manuscript: October 18, 2012
Revised Manuscript: November 16, 2012
Manuscript Accepted: November 28, 2012
Published: December 17, 2012

A. Coens, M. Chakaroun, A. P. A. Fischer, M. W. Lee, A. Boudrioua, B. Geffroy, and G. Vemuri, "Experimental optimization of the optical and electrical properties of a half-wavelength-thick organic hetero-structure in a Micro-cavity," Opt. Express 20, 29252-29259 (2012)

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