SAIP 2011 Support
Blended thin films of tris-(8-hydroxyquinoline) aluminium (Alq3) embedded in polymethyl methacrylate (PMMA) and polystyrene (PS).
Presented by Ms. Mart-Mari DUVENHAGE on 13 Jul 2011 from 14:30 to 14:45
Type: Oral Presentation
Track: Track A - Condensed Matter Physics and Material Science
<p>Alq<sub>3</sub> is widely used in organic light emitting diodes (OLEDs) as emission and electron transport layer. During the fabrication of OLEDs the current trend is to use solution-processing; however, Alq<sub>3</sub> must be vacuum deposited. One possible way to overcome this problem is to use different polymers containing the Alq3. In this study blended thin films of Alq<sub>3</sub> embedded in PMMA and PS matrices at different molar concentration ranging from 0.5% to 15% was investigated. The photoluminescence (PL) characteristics of the blended films of Alq<sub>3</sub>:PMMA and Alq<sub>3</sub>:PS was obtained. This was done by exposure of the films to 335 nm light. Emission peaks were obtained at 520 nm and 517 nm for the Alq<sub>3</sub>:PMMA and Alq<sub>3</sub>:PS films, respectively. The measurements were repeated for a period of one month, with one week intervals between measurements, to confirm the results and also to see if there is any decrease in luminescence intensity over time. Degradation in emission was observed during this period. Absorption measurements were performed on the blended and unblended films to investigate the effect of the polymer matrix. The x-ray diffraction (XRD) spectra confirmed the amorphous nature of the blended films. Atomic force microscopy (AFM) measurements showed that smooth uniform films had formed.
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