Design,preparation,properties And Application Of ZGSO:Cr,Yb,Er Phosphors

Up-conversion luminescence(UCL)refers to nonlinear optical processes in which low-energy excitation can be converted to higher-energy emission through sequential photon absorption and energy transfer processes.UCL materials have been paid great attention due to their excellent prospects in various areas such as luminescent labeling,displays,solar energy,anti-counterfeiting,biological imaging etc.Long persistent luminescence(LPL)is a phenomenon in which the materials can continue emitting light from minutes to hours after the stoppage of excitation,and LPL materials have been widely used in traffic signage,road signs,security signs and glow-in-the-dark dials and displays,etc.In recent years,these materials have been widely concerned in the biological imaging,especially as nano optical probes.However,UCL can not luminescence for a long time,and LPL needs high-energy excitation,which limit their application to a certain extent.Based on the unique luminescence processes of UCL and LPL,a new persistent luminescence process called up-converted persistent luminescence(UCPL)have recently been proposed by combining the UCL and LPL,which enables to generate persistent luminescence having emission energy higher than the excitation energy.In particular,the NIR excitation and persistent emission properties of the prepared UCPL phosphors may act as ideal optical deep tissue probes,broadband noncoherent exciting photonic solar cells materials,optical temperature sensing and so on.However,At present,these prepared materials are large particles or blocks,or nano ones with weak luminescence,or the excitation conditions are harsh and complex,which is not easy to be excited,and its application belongs to the blank stage.In this paper,the design,preparation and properties of up conversion long afterglow materials and their composites are discussed and studied,and UCPL are developed.By introducing Yb3+-Er3+ions into Zn3Ga2SnO8:1%Cr3+to obtain UCPL material,and further compounding material to obtain luminescent bone material,luminescent ink,luminescent haze particles and other research object materials,to obtain the morphological structure characteristics,luminescent characteristics,mechanical characteristics or anti-counterfeiting characteristics of the above materials The specific research results are as follows:(1)A series of up conversion long afterglow luminescent materials,such as Zn3Ga2SnO8:1%Cr3+,5%Yb3+,0.5%Er3+(ZGSO:Cr,Yb,Er),were obtained by high temperature solid state method.The green up conversion emission peaks around 525 nm and 545 nm,the red up conversion emission peak around 655 nm and the near infrared characteristic emission peaks around 696 nm of Cr3+ were studied under the excitation of 980 nm near-infrared light.The 1 h afterglow decay of Cr3+ at 696 nm after the excitation stopped at 274 nm was studied.It is proved that"Yb3+?Er3+?Cr3+" energy transfer and luminescent properties.The structure and luminescent properties of Zn1+xGa2-2xSnxO4:1%Cr3+,a%Yb3+,b%Er3+with different preparation temperature were studied.According to all the factors,the best preparation temperature is 1450?,and the temperature is kept for 2h.At the same time,nano Zn3Ga2SnO8:1%Cr3,5%Yb3+,0.5%Er3+up conversion long afterglow phosphors were prepared by hydrothermal method and sol-gel method.(2)The mechanical properties of ZGSO:Cr,Yb,Er/?-TCP composite bone cement material are studied.The compressive strength is 10.1 MPa,the bending strength is 8.27 MPa,the initial setting time is 62 min,and the final setting time is 108 min.The light-emitting imaging properties were studied.The ratio of the light-emitting materials to 2wt.%was reasonable.The afterglow imaging could be through?1cm thick pork tenderloin.After 20 minutes,it could be clearly observed and had good biological activity.(3)Zn3Ga2SnOg:1%Cr3+,5%Yb3+,0.5%Er3+(ZGSO:Cr,Yb,Er)based on sol-gel method were applied to the production of colorless anti-counterfeit ink,and different proportion of composite luminescent ink was prepared.The luminescent performance and resistance of 7.5wt%ZGSO:Cr,Yb,Er/resin composite luminescent ink materials were analyzed.The composite materials which can be painted,visualized,observed and with good luminescent performance were obtained,and the composite materials with general resistance of 4-5 grade were obtained.(4)Using Zn3Ga2GeO8:1%Cr3+(ZGGO:Cr),a near infrared micro nano luminescent material with strong light penetration,as the traceable luminescent particles,ZGGO:Cr traceable composite haze particles were prepared by chemical bond coupling esterification.The luminescent properties of ZGGO:Cr traceable composite haze particles were studied.After irradiation with 274 nm ultraviolet light for 10 minutes,a persistent emission peak with a growth time of more than 60 minutes could be produced at 696 nm.To explore its application in the field of biological research,simulation of?1 cm thick pork tissue,maple leaf tissue imaging,can see a clear,high-quality image,the duration is more than 20 minutes.To sum up,based on Zn3Ga2SnO8:1%Cr3+,5%Yb3+,0.5%Er3+,Zn3Ga2GeO8:1%Cr3+ and their composites,this paper studies their morphology,structure and luminescent properties,and explores the preparation and application of luminescent materials.