Research On Warm Long Afterglow Materials

Long persistent luminescent material is a function material that can illuminatefor a long time after the lamp-house is closed.Much attention has been focused onlong persistent luminescent materials because of its unique characteristics.From theearly fields of emergency instructions,luminescent ceramics extended to informationstorage,high-energy-ray detection fields,it increase the market demand for longafterglow materials．At present, the research of the blue and green long afterglowmaterials in alkaline earth aluminates and silicate has become mature,and itsluminescent and afterglow properties meet the demand of practicalapplication． However,the research of red long persistent luminescent is relativelyslow,and its luminescent and afterglow properties is far from the demand of realapplication, leading to get difficultly orange, yellow warm long afterglow materialsmixing with blue, green luminescent．Y2O2S：Eu3+,Mg2+, Ti4+materials is the bestmaterials with long persistent luminescent in red afterglow material,and its afterglowtime has6h,but poor stability,environment pollution and other deficiencies of sulfuroxide material limit the application of the material．In view of the above questions,firstly we prepared the CaTiO3：Pr3+redafterglow material by the high temperature solid phase reaction． we alsosystematically study the influence of the various factors on the luminescenceproperties and afterglow performance．And then we proposed a new method to get thewarm long afterglow materials by mixing the blue long afterglow materials with redluminescence material using the blue long afterglow luminescent material asexcitation source．We study the influence of the synthesis temperature and the concentration ofPr3+,Zn2+on the phase,luminescence properties and afterglow performance of thematerial． the emission peek of The samples at612nm originate from1D2to3H4emission Pr3+under the333nm originating from O(2P) to Ti(3d) transfer．And the bestsynthesis temperature1350℃,the concentration of Pr3+0.2mol%, the concentration ofZn2+10mol%were obtained through experiments on CaTiO3：Pr3+in this paper．In the composite excitation of the blue long afterglow materials and redluminescence material,We study luminescence properties of the composite excitationof the blue long-lasting materials Sr4Al14O25：Eu2+,Dy3+and Led fluorescent Sr2Si5N8： Eu2+by using the two ways of directly uniform mixing method and coatingmethod．the two methods all verify the feasibility of composite excitation．Thestrongest Orange red light emission was get when weight ratio of Sr4Al14O25：Eu2+,Dy3+and Sr2Si5N8：Eu2+was4：1in the directly uniform mixing method．In thecoating method,we can effectively adjust the ratio of the orange red light in themixing light by changing the order and number of the phosphor layers．...