A kind of preparation method of polycrystalline photoluminescence zinc tungstate film

Abstract

The invention discloses a preparation method for a polycrystalline photo-induced luminous zinc tungstate film. The preparation method adopts a magnetron sputtering method for preparing, and comprisesthe following steps of: (a) preparing a tungsten oxide film layer; (b) preparing a zinc oxide film layer on the basis of the step (a); (c) preparing a tungsten oxide film on the basis of step (b), andrepeating operations in step (a); and (d) annealing a WO3 / ZnO / WO3 multi-layer film prepared in the step (d) in air, and naturally cooling to obtain a final sample. The preparation method adopts metaltungsten and zinc oxide ceramic as a target material, is low in cost, is environmentally friendly, and can be used for large-scale production; and the prepared polycrystalline photo-induced luminouszinc tungstate film is combined with a substrate to have excellent photoluminescence performance and relatively good transparency (greater than 70%).

Description

technical field [0001] The invention relates to the technical field of coating, in particular to a method for preparing a polycrystalline photoluminescence zinc tungstate film. technical background [0002] Luminescent materials have been widely used in various fields of the national economy and people's daily life, and are indispensable materials in optoelectronic devices such as lighting, displays, energy-saving lamps, and radiation detectors. Among them, based on tungstate ion (WO 4 2- ) zinc tungstate (ZnWO 4 ) crystal is an excellent scintillation crystal, under the excitation of ultraviolet light, ZnWO 4 Crystals can emit strong blue-green light, and have the advantages of stable chemical properties, strong resistance to radiation and strong light damage, and have good application prospects in exciting crystals and ionizing radiation detectors. At the same time, with the continuous improvement of the miniaturization, integration, energy saving and performance requi...

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Problems solved by technology

[0003] In 1998, M. Bonanni et al. in Germany (M. Bonanni, et al, Chem. Mater. 1998, 10, 304-310) ZnWO was prepared from the heterogeneous colloidal complex of zinc acetate and tungsten hexaformate 4 Thin film, this kind of film can emit strong blue light, but its preparation process is complicated, involving the pre-dehydration treatment of metal-organic compounds at different temperatures and the subsequent sol-gel process, and the prepared film is not ideally bonded to the substrate

In 2003, Japanese Hideki Hayashi et al. (Hideki Hayashi, et al, Appl. Phys. Lett. 2003, 82: 1365) prepared ZnO-WO by pulse deposition method 3 Binary composite thin films have obtained luminescent thin films based on zinc tungstate, but it is difficult to achieve large-area thin films by this preparation method

In 2012 Ukraine A. M. Dubovik et al (A. M. Dubovik, et al, J. Phys. & Astronmy, 2012, 1(1): 56) Using ion beam sputtering ZnWO 4 Single crystal prepared ZnWO 4 thin film, which emits blue-green light under X-ray irradiation, but its sputtering target ZnWO 4 The cost of single crystal is too expensive, and it is easy to form non-stoichiometric ZnWO in the sputtering process 4

In recent years, people have used sodium tungstate, ammonium tungstate, zinc nitrate, zinc acetate, etc. as raw materials to prepare polycrystalline ZnWO on glass substrates by sol-gel method and hydrothermal method. 4 Luminescent film, found that the film can emit light of 470-490nm under the excitation of 270-300nm light, but this method is easy to introduce impurities during the preparation process, the process parameters are complicated, and the low annealing temperature (<500°C) is also It will lead to low crystallinity of the film, affect the luminous performance, and the bonding force between the coating layer and the substrate is weak

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