Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/44983
標題: Improvement of the outcoupling efficiency of an organic light-emitting device by attaching microstructured films
作者: Lin, H.Y.
戴慶良
Lee, J.H.
Wei, M.K.
Dai, C.L.
Wu, C.F.
Ho, Y.H.
Wu, T.C.
關鍵字: luminous current efficiency
luminous power efficiency
organic
light-emitting device
diffuser film
brightness-enhancement film
electroluminescent diodes
microlens array
emission
enhancement
scattering
期刊/報告no:: Optics Communications, Volume 275, Issue 2, Page(s) 464-469.
摘要: In this paper, we present and analyse the optical characteristics, such as spectral shift, CIE coordinates, viewing angle dependence, luminous current efficiency and luminous power efficiency, of an organic light-emitting device (OLED) with a commercial diffuser film or a brightness-enhancement film (BEF) attached. Compared to a planar green OLED, the luminous current efficiencies of the OLED with an attached diffuser film or BEF increase by 29% and 23%, respectively. The overall luminous power efficiencies are enhanced by 28% and 7%. Compared to the planar green device, we observe blue shifts at different viewing angles when microstructured films are attached, which is the evidence that the waveguiding modes are being extracted. In our planar OLED, the peak wavelength blue shifts and the full width at the half maximum (FWHM) decrease with increasing viewing angles due to the microcavity effect. When the diffuser is attached, the spectral peak has a constant blue shift (6 nm) compared to that of the planar OLED. On the other hand, in the BEF case, the spectral shift depends on the viewing angle (2-12 nm blue shifts from 0 to 80 degrees). This is due to the different operating principles (scattering and redirected light) of the diffuser and BEF. Since the transmittance spectra of both the diffuser film and the BEF are flat over the visible range, it is suitable for lighting applications by using white OLED. When attaching the films on a commercial white OILED, the luminous current efficiencies of the OLED with an attached diffuser film or BEF increase by 34% and 31%, respectively. The overall luminous power efficiencies are enhanced by 42% and 8%. (c) 2007 Elsevier B.V. All rights reserved.
URI: http://hdl.handle.net/11455/44983
ISSN: 0030-4018
文章連結: http://dx.doi.org/10.1016/j.optcom.2007.03.028
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