Study On Preraration And Properties Of PDP Selective Optical Thin Films

The near-infrared light will be produced when plasma display panel works and it will influence the image color and brightness. In order to remove the interference generated by near-infrared light the optical protection film need to be installed in front of the PDP display. This paper’s target is to decrease the interference generated by near-infrared light and ensure the transmittance of visible light. Choosing ITO and LaB6 as the materials of PDP selective optical thin film and the main contents of this paper including:1. ITO optical thin film is deposited on the common glass substrate with the method of magnetron sputtering and research the technological process detailed: the sputtering power, argon flow, argon/oxygen flow ratio and deposition time. By testing the properties of ITO optical thin film shows the best parameters: the sputtering power is 90 W, argon flow rate is 25 sccm, argon/oxygen flow ratio is 25:2 and the sputtering time is 15 min. Under the best parameters of magnetron sputtering the average transmittance in visible light(380-780nm) is 80.2% and in the near-infrared light(780-1100nm) is 64.5%, R□=21Ω/□.2. Using H3PO4 to disperse nanometer La B6 powders and researching the distributed processing. According test the content of hydrogen in LaB6 powders after dispersing by element analyzer to exploring the process parameters of nanometer LaB6 dispersion: the heating time, dispersal temperature and the concentration of H3PO4. This paper shows the optimum technological parameters are as follows: heating time is 8h, the dispersal temperature is 80 ℃, the concentration of H3PO4 is 63.8%. The hydrogen content in nanometer LaB6 powder is 3.7% after dispersing with the best technological parameters.3. Using SEM to observing the surface morphology of nanometer LaB6 powder after dispersion. The agglomeration of nanometer LaB6 powder is reduced deeply after modification and analysis the element by element analyzer. The hydrogen content in nanometer La B6 powder increased 4.3 times after dispersion of modified.4. The SR(Sedimentation Ratio) in natural sedimentation experiment can value the dispersion stability of LaB6 powder after dispersing. The dispersion stability was significantly increased. The sedimentation rate is only 30% after 36 days in natural environment. At the same time, using anhydrous alcohol as the dispersion medium and analyzing the effects of different types of surfactants(DBSA, PEG-2000 and PEI) on dispersal stable system. We obtained the best concentration of three different kinds of surface active agent are: 3%, 5%, 8%.5. Preparing PDP optical protection thin film with the dispersion of nanometer LaB6 in the way of spin coating and spraying upon ITO as the first level layer. Researching the influence of different parameter detailed: LaB6 nanometer powder mass ratio, spin speed, spray gun caliber and the annealing temperature. Though testing the performance of the film under the optimum process parameters we get some conclusions are as follows: the film’s average transmittance in the range of visible light is 76.9% and average transmittance near-infrared light is 55.7%, square resistance is 24Ω/□ which prepared by spin coating. The film’s average transmittance in the range of visible light is 75.8% and average transmittance near-infrared light is 56.2%, square resistance is 28Ω/□ which prepared by spraying.