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Preparation and characterization of thin films of the FED zinc oxide fluorescent

Author: HuangYanWei
Tutor: YaoNing；ZhangBingLin
School: Zhengzhou University
Course: Condensed Matter Physics
Keywords: Electrodeposition ZnO thin films Photoluminescence The field emission flat panel display Cathode ray fluorescence
CLC: O484.4
Type: Master's thesis
Year: 2007
Downloads: 214
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Abstract


The field emission display (FED) is a newly developed flat panel displays, with the nature of the conventional cathode ray tube (Cathode Ray Tube, CRT) distinguishes FED using field emission cathode arrays (FEAs) on a large number of micro-cathode electron beam emitted direct bombardment of the phosphor, and the anode is a low driving voltage, it having excellent characteristics in terms of brightness, viewing angle, and response time, the working temperature range, power consumption, etc.. FED deflection coils is not required, and the working voltage is low and therefore can be made of a thin flat panel display (FPD). Preparation key to the excellent performance of the FED includes two aspects: First, the FEAs the design and preparation of the phosphor prepared. In recent years, although the FED continuously improve the performance of the cathode material, anode phosphor development is lagging behind. Anode fluorescent material development improve FED excellent display performance has become a key factor. This topic is research to solve this problem and has made new progress. The anode used in the fluorescent material can not meet the requirements for many reasons, the primary reasons for the lack of excitation of the fluorescent material with a low voltage, high luminous efficiency, in particular, can be used as the RGB phosphor material. Second, is now put into application are all powders, the particle size in the micron order of magnitude or more, this form of material inevitably exist not flat, poor conductive need the drawbacks of the adhesive, etc., and Either coated screen technology will not completely solve the above problem. In contrast, the flatness of the thin film material is self-evident, as compared with the powder, film-type fluorescent material, i.e. a fluorescent film, completely hope for FED devices. ZnO fluorescent film material, the subject as the object of study, cathodic electrodeposition of Zn (NO 3 ) 2 aqueous solution as the electrolyte in the transparent conductive glass ITO substrate on the preparation of ZnO thin films. The tests show that the prepared ZnO film having the particles uniform, dense surface, and have a higher emission luminance of the fluorescent material is a promising field emission anode. In this thesis, including the following: 1. ZnO fluorescent film preparation and optimization of experimental parameters electrolytic cell design uses a self-designed system, zinc tablets (99.9%) as the anode, the transparent conductive glass, ITO (indium tin oxide plated magnetron sputtering on glass substrates 2 solution) prepared with deionized water as the working electrode, Zn (NO 3 ) electrolyte of ZnO fluorescent film on ITO glass substrate. Orthogonal experimental design to optimize the design of the deposition parameters - solution concentration, deposition temperature, current density, deposition time. 2. ZnO fluorescent film structure and morphology analysis, analysis of ZnO thin films grown under different conditions found, and deposition conditions in solution concentration of 0.06 mol / l to 0.08 mol / l, current 0.03A, deposition temperature of 70 ° C, deposition time of 10min ~ 30min obtained when the film has a better crystallization conditions, the particle size of 1μm, and a thickness of 1 to 2 μm. By scanning electron microscopy (SEM), X-ray diffraction (XRD) spectroscopy to analyze the structure and morphology of the film, the results show that the ZnO films with (002) preferred growth orientation of the wurtzite structure. 3. ZnO thin films by light-induced luminescence and cathode-ray fluorescence performance analysis using FLUOROLOG-3-TAU-type light-induced luminescence spectrum analyzer and YFC-2-type cathode ray luminescence spectrum analyzer ZnO thin film photoluminescence Send spectrum and cathode-ray fluorescence spectra were tested, results show that, the samples annealed without annealing and low temperature (450 ° C to 550 ° C), in addition to the wavelength in a wavelength band at 380nm ~ 395nm - the inter-band UV transitions outer, there orange light and red light of the wavelength in a wavelength of 590nm ~ 610nm and 652nm at The launch has been reported in the literature on the fresh. By studying their luminescence properties, analysis and discussion of the orange-red light emission mechanism. At the same time improve the annealing temperature (600 ° C or above) the green emission of ZnO thin films, visible, annealing not only to improve the crystallinity of ZnO is also beneficial to the green emission of ZnO thin films, which is to improve the brightness of the ZnO fluorescent film a feasible way. 4. Cathodoluminescence brightness test of ZnO thin films and its flat-panel display as the anode of the light-emitting layer package of digital control devices using field emission vacuum test device luminance meter its the cathodoluminescence brightness test analysis, found in 1.7V/μm electric field under the brightness up to 2 x 10 2 cd / m 2 meet the field-emission flat panel display phosphors low voltage drive requirements, the luminous brightness close to the actual need. Judge its actual value at the same time turn-on voltage about 0.55V/μm, emission current density is about 6mA/cm 2 amorphous carbon films as the cathode, the experiment obtained ZnO films as field emission the anode phosphor layer, encapsulates digital tube, flat panel display test its operating parameters, found that the brightness 2.2V/μm electric field up to 1.8 × 10 2 cd / m 2 .

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CLC: > Mathematical sciences and chemical > Physics > Solid State Physics > Thin Film Physics > The nature of the films
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