These last years, the development of hybrid polymer-inorganic nanocomposites has been attracted much attention. In particular, composites containing lanthanide-doped materials as filler are candidates for the development of light emitting diodes, lasers and solar cells. Polymers such as polymethylmethacrylate (PMMA), polycarbonate (PC) and polyurethane (PU) are adequate matrices because their good transmission over the visible spectral range, excellent mechanical properties of plasticity, lightness, easiness of fabrication and low cost of mass production. Yttrium aluminum garnet (YAG) doped with Ce(III) ions is one of the yellow phosphor used in the major commercial white LED combined with the InGaN blue-emitting chip. However, the long-term reliability as well as lifetime of the LED are affected by the stability of the polymer at high temperature and by the dispersion of the particles in the polymer.Therefore, the research and development of phosphor composites material with both superior optical performance and high physical-chemical stability have been highly desired.In a recent work, the preparation of Ce:YAG-PMMA nanocomposite using in situ polymerization has been reported1. A good dispersion of Ce:YAG nanoparticles maintaining their luminescence properties has been obtained. In addition, an increase of thermal stability and stiffness of PMMA was observed2. The preparation of Ce:YAG-PMMA3 and Ce:YAG-PC composites has been performed by using the melt compounding method. This method is not expensive and allows to obtain large quantity of materials and reduces the exposition at the carcinogenic monomer metyl-methacrylate used as starting precursor in the in situ polymerization. The Ce:YAG nanoparticles and Ce:YAG nanocomposites characterization was performed using Transmission Electron Microscopy, X-ray diffraction, thermogravimetry and photoluminescence spectroscopy. The effect of filler quantity, in the range 0.1-5 wt.%, on the morphology, optical and thermal properties was investigated. 1.Saladino, M.L.; Zanotto, A.; Chillura Martino, D.; Spinella, A.; Nasillo, G.; Caponetti, E. Langmuir 26(16), 13442–13449 (2010).2.Zanotto, A.; Spinella, A.; Nasillo, G.; Caponetti, E.; Luyt, A.S. Express Polymer Letters 6(5), 410-416 (2012).3.Saladino, M.L:; Chillura Martino, D.; Floriano, M.A.; Hreniak, D. Marciniak, L.; Stręk, W.; Caponetti, E. The Journal of Physical Chemistry C, 118, 9107−9113 (2014).
|Numero di pagine||1|
|Stato di pubblicazione||Published - 2015|