Preparation And Luminescent Properties Of Silver-Zeolite (SOD Zeolite,Y Zeolite) Luminescent Materials

Silver nanoclusters have a wide range of applications in many fields such as LED lighting,biological imaging and fluorescence sensing due to their excellent optical properties,good biocompatibility and sensitivity to external stimuli.Aiming at the key scientific problem of poor stability of silver nanoclusters,this paper successfully obtains stable luminescent silver-zeolite composites under mild preparation conditions by using host-guest assembly strategy,investigates the effects of Cs~+and Ag~+on the luminescence properties of silver-zeolite composites,reveals the effect mechanism of zeolite particle size on the luminescence properties of silver-zeolite composites,explains the application of silver-zeolite composites in the field of NUV-LED.The main study contents of this paper are as follows:1)A series of Ag-zeolite composites were prepared by adding Ag~+and Cs~+ions into the as-synthesized SOD zeolites and thermal-treated under a mild condition.Ag-SOD composites with green,yellow and red emission were fabricated by adjusting the content of Ag~+.In addition,the luminescence intensity and photoluminescence quantum yield(15.35%-31.67%)were significantly improved because of the addition of Cs~+.The luminescent material owns very wide excitation band(from 300 to 450 nm),which lays a foundation for its application in NUV-LED.2)A series of Ag-zeolite luminescent composites were prepared based on SOD and FAUY zeolites,and the effect of zeolite particle size on their luminescent properties was discussed.With the increase of zeolite particle size from nanometer to micron,the luminescence color of Ag-SOD composites changed from orange-red to yellowish green,and the luminescence color of Ag-FAUY zeolite composites changed from yellow to green.It is found that this color change is related to the nuclearity of luminescent silver nanoclusters in the composites through the characterization of EXAFS.The nuclearity of luminescent silver nanoclusters formed in the composites with large zeolite particle size is small.These composites are very sensitive to temperature,which is expected to be used as potential temperature fluorescent sensing materials.