TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Method: The step (a) further comprises allowing the conductive glass to stand at room temperature for 5 minutes after coating the titanium dioxide slurry on the conductive glass, and curing the titanium dioxide layer in an oven at 120 degrees C for 6 minutes.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): The preparation of (I), comprises (a) adding potassium tert-butoxide and methyl triphenyl phosphonium iodide to a reactor, drying the reactants under vacuum, adding 1-(4-diphenylamino-phenyl)-ethanone dissolved in tetrahydrofuran to the reactor under nitrogen atmosphere, stirring the obtained mixture and reacting it at room temperature for 4 hours, extracting the product using water and dichloromethane mixture to obtain organic phase, carrying out rotary evaporation and then column chromatography using n-hexane as eluent, and recrystallizing the obtained solid by dichloromethane-methanol mixture to obtain white crystals of diphenyl-(4-vinyl-phenyl)-amine, (b) adding diphenyl-(4-vinyl-phenyl)-amine obtained in step (a), 4-bromo-2-methoxy-benzaldehyde, sodium carbonate, 2,6-di-tert-butyl-cresol and palladium catalyst to the reactor, drying the reactants under vacuum, adding dimethylacetamide to the reactor under nitrogen atmosphere, refluxing the obtained reaction mixture for 6 hours, extracting the product using water and dichloromethane mixture to obtain organic phase, carrying out rotary evaporation and then column chromatography using n-hexane-dichloromethane as eluent, and purifying by recrystallization to obtain orange crystals of 4-((E)-2-(4-diphenylamino-phenyl)-vinyl)-2-methoxy-benzaldehyde, and (c) adding 4-((E)-2-(4-diphenylamino-phenyl)-vinyl)-2-methoxy-benzaldehyde obtained in step (b), cyanoacetic acid and ammonium acetate to the reactor, drying the reactants under vacuum, adding toluene to the reactor under nitrogen atmosphere, refluxing the mixture for 8 hours, cooling the mixture for precipitating red substance, filtering, and washing the precipitate with n-hexane, and then with n-hexane-diethyl ether mixed solvent (used in a ratio of 5:1) to obtain red solid of (I).