Views:245 Author:Site Editor Publish Time: 2020-07-05 Origin:Site
Long self-luminous material is a photoluminescence material. It is a kind of material that absorbs energy and can continue to emit light after the excitation stops. It is a material with promising applications. In this article, we will briefly introduce the preparation method of long self-luminous materials.
The high-temperature solid-phase reaction method for preparing long self-luminous materials is a traditional method, and this method is widely used. Generally speaking, the general operation of solid phase reaction is based on solid powder. Weigh the raw materials to the required purity in a certain proportion, add a certain amount of flux, mix and grind them thoroughly, and then burn under certain conditions. It is precisely formulated according to the stoichiometric ratio of the self-luminous material, and it is burned in a high-temperature resistance furnace in a certain protective gas atmosphere or reducing atmosphere at 900 ° C ~ 1450 ° C for 2h-5h. The burning process, the types and ratios of cosolvents and doped ions all have significant effects on the structure and luminous properties of long self-luminous material.
In order to overcome the disadvantages of high-temperature solid-phase methods, a number of other methods have been developed. Among them, the sol-gel method has attracted wide attention as a wet chemical method. This method originated in the 18th century, and it has been widely used.
The sol-gel method uses a specific material precursor to hydrolyze under certain conditions to form a sol, and then the solvent is volatilized and heated to transform the sol into a gel with a network structure, and then subjected to an appropriate post-treatment process to form a nanomaterial a way.
The sol-gel technology is mainly used to prepare the self-luminous material by using a metal alkoxide method, that is, a metal alkoxide is used as a raw material to undergo a hydrolysis reaction and a polymerization reaction to obtain a sol and a gel. Zhang Dong and his collaborators prepared ZnAl2O4: Mn materials using the sol-gel method. The sintering temperature is 100 to 200 ° C lower than the traditional method.
In recent years, the preparation of sol-gels by inorganic salt complexes has gradually attracted people's attention. Among them, the Pechin method is mainly used to prepare sols by citric acid and ethylene glycol. This method is fast and simple. The cost is lower than the metal alkoxide method.
Combustion refers to a method of burning synthetic materials by precursors. When the reactant reaches the ignition temperature of the exothermic reaction, it is ignited in some way, and the subsequent reaction is maintained by the emitted heat, and the combustion product is the material to be prepared. The main principle of this method is to make the corresponding raw materials into corresponding nitrates, add urea as fuel, and heat it for a few minutes at a certain temperature. After a severe oxidation-reduction reaction, a large amount of gas overflows and then burns.
This method has considerable applicability, and the gas produced during the combustion process can also be used as a protective gas. When using this method, the furnace temperature can be greatly reduced, which is an efficient and energy-saving method.
In addition to the above methods for the preparation of long self-luminous material, there are also hydrothermal synthesis methods, microwave-assisted synthesis methods, chemical precipitation methods, and many others. Through the use of these new synthesis technologies, scientific research results show that breakthroughs have been made in improving the luminous properties of materials, and it is also possible to obtain self-luminous materials that cannot be obtained by traditional preparation techniques, thereby obtaining new types of self-luminous materials and further broadening the application areas.