Electrospinning Preparation Of Alq3/poly(methyl Methacrvlate) Composite Nanofibers And Study On Their Photoiuminescence Properties

Under the development of nanotechnology, nanfibers has received much attentionbecause of its unique physicochemical property and its potential application prospect.Electrospinning is one major effective technique to prepare fibers whose diameters may rangefrom a few nanometers to microns directly and continuously. When organic light-emittingmacromolecules are doped into electro spinning fibers, light-emitting nanfibers withdiameters at nanmetric level and large Specific surface area can be made. This kind ofnanfibers with such unique composition and luminous property are quite valuable inapplication in photoelectric field.This research first used PMMA (Poly Methyl Methacrylate) and DMF (N, N-dimethylformamide) to formulate the prodromic solution, prepared the PMMA nanfibers withwell-distributed diameters and smooth surfaces and then led in concentration8-hydroxyquinoline aluminum molecules, which made Alq3/PMMA nanfibers withcompound systems. Finally, the research controlled the quality of Alq3in it and producedAlq3/PMMA compound nanfibers with different Alq3concentrations.Using SEM, EDX, XRD and FT-IR, this research authenticated the surface andcomposition of Alq3/PMMA compound nanfibers that produced above, which has proved thatAlq3molecules are well distributed on the nanfibers. After that, the research analyzed theirfluorescence excitation spectrum and fluorescence emission spectrum to study their opticalproperties. The following results have been proved. In the fluorescence excitation spectrum,the maximal excitation peak of Alq3powder was373nm, and that of Alq3/PMMA compoundnanfibers was268nm. The Ï€â†'Ï€*electron transition pair among molecules contributed mostto the fluorescence emission. In the fluorescence emission spectrum, Alq3/PMMA compoundnanfibers had a high qualified luminous property. Their luminous intensity would strengthenas the content of Alq3increased, and when the content reached a certain level, thefluorescence quench would occur. At the same time, the maximal emission peak ofAlq3/PMMA compound nanfibers presented the red-shift phenomenon. When theconcentration of Alq3reached its maximal level, the maximal fluorigenic would reach514nm,which was8nm further than that of Alq3powder as a result of the action forces amongmolecules.