Preparation And Properties Of Efficient Stable And Tunable Rare Earth UV Enhanced Thin Films

In recent years,UV detection technology has been widely used in fingerprint identification,material analysis,ultraviolet communication,high-voltage corona analysis and natural disaster prediction?e.g.monitoring of cumulonimbus clouds and forest fires?,and many other fields.Although the new wide-bandgap UV semiconductor imaging devices prepared by AlGaN and SiC materials have good performance,due to the limitations of technical conditions such as domestic material quality and device preparation process,it is difficult to be widely applied in a short period of time.The use of silicon-based photodetector devices for process improvement to achieve deep ultraviolet light detection has become an effective way.Among them,the process improvement method of plating the ultraviolet reinforced film can well satisfies the comprehensive requirements of the ease of preparation,cost consideration and enhancement effect of the device under the current conditions.The commonly used ultraviolet coating material is organic molecule,Lumogen.Although the material has good fluorescence performance,it has many limitations such as poor stability of organic materials,inability to detect ultraviolet light in a narrow band,single film formation method,and complicated process.Therefore,it is necessary to prepare a novel ultraviolet reinforced material capable of achieving narrow-band ultraviolet detection,good stability,simple film formation process and obvious enhancement effect.As a kind of fluorescent material with excellent luminescence properties,rare earth complexes can realize absorption in different ultraviolet bands by changing the structure of organic ligand,thus achieving the effect of adjustable fluorescence.In this paper,the excellent fluorescence performance of the central light-emitting unit Eu³⁺was combined with the adjustability of benzoic acid and thiophene trifluoroacetone organic ligands,and a new type of highly efficient and adjustable UV-enhanced material and film was successfully prepared.However,in the characterization test of light and thermal stability,it was found that the rare earth complex material has excellent fluorescence performance but poor stability.In order to solve this problem and achieve better UV enhancement,we introduced a more stable graphene oxide and a rare earth complex for hydrogen bonding.The experimental results show that the introduction of graphene oxide can not only maintain the high-efficiency fluorescence performance of the rare earth complex UV-enhanced material,but also effectively improve its light and thermal stability,and achieve high-efficiency and stable UV-enhancing properties.