NOVELTY - Formation of luminescent polymer film involves preparing a precursor solution of reusable crystal dissolved in N,N-dimethylformamide at a concentration of 0.0005 mol/L, performing doping immediately, depositing hot substrate at 240 degrees C by heating the substrate in a tin bath on a hot plate, and depositing solid film by ultrasonic spray pyrolytic reaction by the decomposition of the precursor solution. The deposition of hot substrate is performed by applying a secondary water spray during deposition using nitrogen as carrier gas.    USE - Formation of luminescent polymer film. Uses include but are not limited to electrical and biomedical engineering, organic light-emitting diode, flat panel display, organic memory, organic photovoltaic cell, fuel cell, flexible television, transistor, memories on plastic substrate, roll solar panel, plastic erasable paper, food packaging and wrapping materials, and naval, military, and transportation industries.    ADVANTAGE - The method enables formation of thin luminescent polymer film with excellent versatility and efficient recycling of waste, by economical and environmentally-friendly process.    DETAILED DESCRIPTION - Formation of luminescent polymer film involves preparing a precursor solution of reusable crystal dissolved in N,N-dimethylformamide at a concentration of 0.0005 mol/L which is formulated by heating N,N-dimethylformamide to less than 170 degrees C, adding polystyrene or polyethylene terephthalate powder, and obtaining a clear solution, performing doping immediately by adding yellow, red and/or blue organic pigments having luminescent emissions at 445 nm, 510 nm and 590 nm, respectively, or blue, yellow and/or red fluorescent organic pigments in an amount of 1 g per 130 mL of solution, solutions of chlorides of rare-earths chosen from cesium ions, terbium ions, dysprosium ions, and europium ions capable of obtaining luminescent emissions at 450 nm, 545 nm, 573 nm and 612 nm corresponding to blue, green, yellow and red color light, or nanoparticles of metal oxides with rare-earths impurities e.g. europium-doped aluminum oxide or terbium-doped aluminum oxide, depositing hot substrate at 240 degrees C by heating the substrate in a tin bath on a hot plate, and depositing solid film by ultrasonic spray pyrolytic reaction by the decomposition of the precursor solution. The chloride solutions of rare-earths are obtained by dissolving cesium ions, terbium ions, dysprosium ions, or europium ions in diethylene glycol at 140 degrees C, and obtaining solution having concentration of 0.01 mol/L. The deposition of hot substrate is performed by applying a secondary water spray during deposition using nitrogen as carrier gas, and applying flows of 10 and 5 lpm to the sprays of precursor solution and water, respectively. INDEPENDENT CLAIMS are included for the following:    (1) generation of polyethylene terephthalate powder from reusable polyethylene terephthalate powder, which involves collecting reusable polyethylene terephthalate from washed disposable bottles, removing other materials such as adhesive labels, etc and cutting into small units of 1 mm2, generating flakes, dissolving polyethylene terephthalate flakes using a solution of 6:1 of sulfuric acid and water, pouring the acid solution into 400 mL deionized water under vigorous stirring for obtaining a fine and dense powder, washing and filtering the solution, obtaining a wet and pasty material with a recovery efficiency ratio of 97.5%, drying at 60 degrees C for 12 hours, grinding the dry material into a fine powder, and storing until further usage; and    (2) generation of polystyrene powder from recycled materials, which involves washing recycled polystyrene materials, cutting into large strips of 15x 100 mm, dissolving polystyrene strips using N,N-dimethylformamide, pouring resultant solution into 400 mL methanol under vigorous stirring, obtaining a fine and dense powder with a recovery efficiency ratio of 85%, washing and filtering the powder, obtaining a wet and pasty material, drying the material at 60 degrees C for 2 hours, grinding the dry material into a fine powder, and storing until further usage.