Optimization of microcavity OLED by varying the thickness of multi-layered mirror

Lu, A. W., Chan, J., Rakic, A. D., Ng, A. M. C. and Djurisic, A. B. (2006) Optimization of microcavity OLED by varying the thickness of multi-layered mirror. Optical and Quantum Electronics, 38 12-14: 1091-1099. doi:10.1007/s11082-006-9057-1

Author Lu, A. W.
Chan, J.
Rakic, A. D.
Ng, A. M. C.
Djurisic, A. B.
Title Optimization of microcavity OLED by varying the thickness of multi-layered mirror
Journal name Optical and Quantum Electronics   Check publisher's open access policy
ISSN 0306-8919
Publication date 2006-09
Year available 2006
Sub-type Article (original research)
DOI 10.1007/s11082-006-9057-1
Volume 38
Issue 12-14
Start page 1091
End page 1099
Total pages 9
Editor Joachim Piprek
Siu-Fung Yu
Eric C. Larkins
Place of publication Dordrecht
Publisher Springer
Collection year 2008
Language eng
Subject 291702 Optical and Photonic Systems
240401 Optics and Opto-electronic Physics
700399 Communication services not elsewhere classified
Abstract We optimized the emission efficiency from a microcavity OLEDs consisting of widely used organic materials, N,N'-di(naphthalene-1-yl)-N,N'-diphenylbenzidine (NPB) as a hole transport layer and tris (8-hydroxyquinoline) (Alq(3)) as emitting and electron transporting layer. LiF/Al was used as a cathode, while metallic Ag was used as an anode material. A LiF/NPB bi-layer or NPB layer on top of the cathode was considered to alter the optical properties of the top mirror. The electroluminescence emission spectra, electric field distribution inside the device, carrier density, recombination rate and exciton density were calculated as a function of the position of the emission layer. The results show that for optimal capping layers thicknesses, light output is enhanced as a result of the increase in both the reflectance and transmittance of the top mirror. Once the optimum structure has been determined, the microcavity OLED devices were fabricated and characterized. The experimental results have been compared to the simulations and the influence of the thickness of the mirror layers, emission region width and position on the performance of microcavity OLEDs was discussed.
Keyword Engineering, Electrical & Electronic
microcavity OLEDs
Light-emitting Devices
Q-Index Code C1
Q-Index Status Confirmed Code
Additional Notes Paper presented at the "6th International Conference on Numerical Simulation of Optoelectronic Devices Nanyang Technol Univ, Singapore, SINGAPORE, 11-14 Sep, 2006"

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Created: Wed, 19 Sep 2007, 18:45:54 EST