Views:236 Author:Site Editor Publish Time: 2020-06-22 Origin:Site
Based on the development in the 1980s, inorganic powder luminescent materials entered the 90s with new looks and new achievements. The research on luminescent materials has become a hotspot in scientific research. Especially in recent years, interdisciplinary and new technologies have been integrated to make the synthesis of self-luminous light Materials faces rare opportunities. There are many disadvantages of traditional methods which is mechanical mixing of raw materials and high-temperature solid-phase reaction, such as easy to agglomerate, poor particle uniformity, etc. Luckily, the emergence of some chemical and physical methods opened a new page for luminescent materials development. The following summarizes the new methods on the synthesis of inorganic powder luminescent materials.
Sol-gel method is a new wet chemical synthesis method.
90's is the booming stage of this method, it has drawn great attention from the scientific community for its wide range of applications and is used in the synthesis of various luminescent materials. It has been successfully used in optical equipment. Compared with the traditional high-temperature solid-phase reaction, it has the following advantages:
1) The uniformity of the product is good, especially for multi-component products. The uniformity can reach the molecular or atomic level.
2) The sintering temperature is lower than the high-temperature solid-phase reaction temperature, which can save energy and avoid introducing impurities from the reactor due to the high sintering temperature.
It can be seen from the above that the sol-gel method is a promising wet chemical synthesis method, but there are some disadvantages, such as: high raw material costs, alkoxides are harmful to the human body, and long processing cycles. But with the efforts of scientific workers, this deficiency is gradually being overcome.
The precipitation method is also a commonly used method in the preparation of luminescent materials. The reason why it is used is mainly in the unique advantages of preparing metal oxides and nanomaterials. Nanomaterials are a new level of people's understanding of the objective world. Therefore, research on new systems of nanoluminescent materials, enriching nanoluminescent materials, obtaining and prompting a series of basic physical properties and changing laws, etc. have become the forefront topics for urgent research. The advantages of the product prepared by the precipitation method are: low reaction temperature, high sample purity, uniform particles, small particle size, and good dispersibility. Although this method is an important method for the synthesis of inorganic powder luminescent materials, it may have some problems for the preparation of complex multi-component systems.
Hydrothermal method is also another emerging synthetic method invented in recent years to study inorganic light-emitting materials. This method is mainly an inorganic preparation method that allows substances to undergo chemical reactions at a certain temperature and pressure.
It has good optical, electrical, magnetic, and thermal characteristics, and can achieve multivalent ion doping. These characteristics provide favorable conditions for the search for new materials.
The products made by the traditional method greatly affect the secondary characteristics of the phosphor. Therefore, the combustion method is another new method invented on the basis of overcoming this shortage. The phosphor produced by this method has extended to the blue-violet area and can effectively absorb blue-violet light.
In short, from the new methods introduced above, it can be seen that no matter how novelty and uniqueness the method is, there are also some aspects that need to be improved. Therefore, the preparation of new light-luminous materials should be based on the specific conditions. To select the appropriate experimental scheme and determine the most suitable method is the first step for success.