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Microwave & Optical Communications  |
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| 2005 | Kwong, C. Y., Djurisic, A. B., Cheung, C. H., Chan, J., Rakic, A. D., Tam, H. L., Cheah, K. W., Liu, Z. T., Chan, W. K. and Chui, P. C. (2005). Influence of layer thickness to the emission spectra in microcavity organic light emitting diodes. In: A. D. Rakic and Y. T. Yeow, Proceedings of the 2004 Conference on Optoelectronic and Microelectronic Materials and Devices. Conference on Optoelectronic and Microelectronic Materials and Devices COMMAD 04, The University of Queensland, Brisbane Australia, (347-350). 8-10 December, 2004. |
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Microcavity organic light emitting diodes (OLEDs) have attracted great attention because they can reduce the width of emission spectra from organic materials, enhance brightness and achieve multipeak emission from the same material. In this work, we have fabricated microcavity OLEDs with widely used organic materials, such as N,N'-di(naphthalene-1-yl)-N,N'-diphenylbenzidine (NPB) as a hole transport layer and tris (8-hydroxyquinoline) (Alq) as emitting and electron transporting layer. These organic materials are sandwiched either between two thick silver mirrors or one thin copper and one thick silver mirrors. The influence of total cavity length (from 164 nm to 243nm) and the cavity Q-factor to the emission behavior has been investigated. In all cases, an OLED without bottom mirror, i.e. with the organic materials sandwiched between indium tin oxide and a thick silver mirror, has been fabricated for comparison. We have characterized the devices with photoluminescence, electroluminescence, and reflectance measurements. Multiple peaks have been observed for some devices at larger viewing angles.
| |  Associate Professor Aleksandar Rakic | | eSpace Record: |
http://espace.library.uq.edu.au/view/UQ:8652
| | | | | Links: | Article DOI - Full text from publisher |
| Keywords: | microcavity, OLEDs, organic light-emitting diodes | | |
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