LUMINESCENT FILMS FROM POLYSTYRENE AND POLYETHYLENE TEREPHTHALATE AND METHODS FOR OBTAINING THEM

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The present invention describes the use of polystyrene (PS) and polyethylene terephthalate (PET) obtained from recyclable materials as host lattice for obtaining luminescent films. Organic pigments (OPs) and fluorescent organic pigments (FPOs) were used on these materials as dopants; e.g., blue, yellow and red, having luminescent emissions at 450, 510 and 590 nm, respectively, using also rare earths and nanoparticles of Al2O3 : Tb and Al2O3 : Eu as dopants. PS and PET films were obtained by spray pyrolysis using glass and commercial GaN LEDs substrates (with emissions at 390 nm for violet light and 455 nm for blue light). Measurements of photo and electroluminescence of the films obtained were made using PS films properly doped in electroluminescent devices emitting blue and violet light, which resulted in the emission of white light.