上转换光催化材料制备及应用

Preparation and application of upconversion photocatalytic materials

上转换材料根据组成不同,可分为氟化物、硫化物、卤氧化物等种类,其具有吸收红外光并发射紫外光、可见光的能力,在生物分子标记、上转换激光器、光导纤维通讯、光催化等领域都具有潜在的应用前景.以制备方法为主线,综述了不同制备方法得到的上转换材料的优缺点,其中水热法具有实验条件简单、过程容易控制的特点,超声法获得的产品具有成分均匀、可重复性高,且可用于制备结晶态材料的特点,煅烧及热处理法生长容易,可制成玻璃类制品.对不同制备方法得到的上转换材料光催化性能进行了讨论,就光催化领域的应用现状和发展趋势进行了展望.不同制备方法得到的材料在光谱的响应范围和光催化活性方面存在差异,这种差异并不是制备方法直接影响的,而是因为不同制备方法得到的材料晶体结构差异导致的,所以在光催化领域,制备新型的上转换材料是重点研究方向之一.

Upconversion materials can be classified into fluorides,sulfides,oxyhalides,etc.depending on the composition.They have the ability to absorb infrared light and emit ultraviolet light and visible light.In biomolecular labeling,upconversion laser,optical fiber communication,photocatalysis and other fields have potential application prospects.The advantages and disadvantages of the up-conversion materials obtained by different preparation methods were reviewed.The hydrothermal method has the characteristics of simple experimental conditions and easy control of the process.The products obtained by ultrasonic method have uniform composition,high reproducibility and can be used to prepare crystalline materials.The characteristics of calcination and heat treatment are easy to grow and can be made into glass products.Prospects for the future application of upconversion materials were presented.The photocatalytic properties,the application and development trend of the upconversion materials in the field of photocatalysis were discussed.Materials prepared by different methods exist differences in terms of spectral response range and light catalytic activity.This difference is not directly influenced by the preparation method,but because of material crystal structure difference.So that,in the field of photocatalysis,the preparation of new upconversion material is one of the key research direction.