Determination of the optical constants of polymer light-emitting diode films from single reflection measurements
| Autor: | Xu Liu, Hui Ye, Dexi Zhu, Hongyu Zhen, Wei-Dong Shen |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Conductive polymer
Materials science Acoustics and Ultrasonics Band gap business.industry Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Reflection (mathematics) law Polymer chemistry Dispersion (optics) OLED Optoelectronics business Refractive index Light-emitting diode Diode |
| Zdroj: | Journal of Physics D: Applied Physics. 41:235104 |
| ISSN: | 1361-6463 0022-3727 |
| Popis: | We present a simple and fast method to determine the optical constant and physical thickness of polymer films from a single reflectivity measurement. A self-consistent dispersion formula of the Forouhi–Bloomer model was introduced to fit the measured spectral curves by a modified 'Downhill' simplex algorithm. Four widely used polymer light-emitting diodes materials: poly[2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylenevinylene], poly(9,9-dioctylfluoreny-2,7-diyl) (PFO), poly(N-vinyl carbazole) and poly(3,4-ethylene dioxythiophene) : poly(styrenesulfonate) were investigated by this technique. The refractive indices over the whole visible region as well as the optical band gap extracted by this method agree well with those reported in the literature. The determined physical thicknesses present a deviation less than 4% compared with the experimental values measured by the stylus profiler. The influence of scattering loss on the fitted results is discussed to demonstrate the applicability of this technology for polymer films. |
| Databáze: | OpenAIRE |
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