Study On 5 Preparing Methods Of Non-grinding Long Afterglow Materials

Long afterglow material can be widely used in various fields due to its light storage-luminescence property, especially in the areas such as safety indication, lighting in emergency, instrument in automobile, luminous paint and optical data storage, etc. In recent years much progress has been made in the fields of light source, photoelectron and other correlative technology. As the support materials, the application extent of the non-grinding long afterglow materials doped by rare earth ions has been broadened furtherly, especially the preparation process has been well developed in some new directions, but the luminescent center will be destroyed, the luminous intensity is attenuated during the grinding process of high-temperature solid-state, therefore study on the preparation of non-grinding long afterglow material has become the hotspot. Based on the above, the significance of our studies lies in the preparation process of non-grinding long afterglow material that has yellowish green, blue and red colour. We successfully prepared the yellowish green, blue and red colour long afterglow material by 5 methods for the first time, did many research work on the preparation process, crystal phase of the product, excitation spectrum, emission spectrum, decay curve and influencing factors.Non-grinding long afterglow SrAl₂O₄:Eu²⁺,Dy³⁺ are prepared by sol-frothing method. The processing conditions are: pH=5～6; initial concentration 0.2～0.3mol/L; system temperature 80～90℃; dispersant; frother; calcining temperature 1150℃. XRD analysis show that the product has SrAl₂O₄ structure; FS results indicate that the material can be excited from UV to visible light effectively; the 2 excitation peaks at 381.6nm and 399.2nm; emission peak at 526.8nm; afterglow last up to several hours.Non-grinding long afterglow SrAl₂O₄:Eu²⁺,Dy³⁺ are prepared by combustion-frothing method. The processing conditions are: pH=5～6; initial concentration 0.2～0.3mol/L; system temperature 80～90℃; dispersant; frother; ignition temperature 600℃; nitrate-urea system; V(liquid)/V(crucible)=1/10; n(Sr)/n(urea)=1/12 and with a lid on crucible. XRD analysis show that the product has SrAl₂O₄ structure; FS results indicat that the material can be excited from UV to visible light effectively; the 4 excitation peaks at 371.8nm,398.6nm,410.0nm and 420.4nm; emission peak at 517.2nm; afterglow last up to several hours.Non-grinding long afterglow SrAl₂O₄:Eu²⁺,Dy³⁺ are prepared by microwave-frothing method. The processing conditions are: pH=5～6; initial concentration 0.2～0.3mol/L; system temperature 80～90℃; dispersant; frother; microwave power 800W; radiated time 10min; calcining temperature 1150℃. XRD analysis show that the product has SrAl₂O₄ structure; FS results indicate that the material can be excited from UV to visible light effectively; the 3 excitation peaks at 339.2nm,344.0nm and 400.1nm; emission peak at 514.4nm; afterglow last up to several hours.Non-grinding long afterglow SrAl₂O₄:Eu²⁺,Dy³⁺ are prepared by microwave-combustion method. The processing conditions are: pH=5～6; initial concentration 0.2～0.3mol/L; system temperature 80～90℃; dispersant; frother; microwave power 800W; radiated time 8min; nitrate-urea system; V(liquid)/V(crucible)=1/10; n(Sr)/n(urea)=1/12 and with a lid on crucible. XRD analysis show that the product has SrAl₂O₄ structure; FS results indicate that the material can be excited from UV to visible light effectively; the 2 excitation peaks at 345.0nm and 400.5nm; emission peak at 516.2nm; afterglow last up to several hours.Non-grinding long afterglow SrAl₂O₄:Eu²⁺,Dy³⁺ are prepared by co-precipitation method. The processing conditions are: pH = 9～10; initial concentration 0.1～0.2mol/L; system temperature 80～90℃; dispersant; frother; additive ingredient; calcining temperature 1150℃. XRD analysis show that the product has SrAl₂O₄ structure; FS results indicate that the material can be excited from UV to visible light effectively; the 4 excitation peaks at 314.4nm,347.6nm,378.1nm and 410.8nm; emission peak at 514.0nm; afterglow last up to several hours.Non-grinding long afterglow CaAl₂O₄:Eu²⁺,Dy³⁺ are prepared by sol-frothing method. The processing conditions are: pH=5～6; initial concentration 0.2～0.3mol/L; system temperature 80～90℃; dispersant; frother; calcining temperature 1200℃. XRD analysis show that the product has CaAl₂O₄ structure; FS results indicate that the material can be excited from UV to visible light effectively; the 2 excitation peaks at 264.0nm and 321.6nm; emission peak at 441.2nm; afterglow last up to several hours.Non-grinding long afterglow CaAl₂O₄:Eu²⁺,Dy³⁺ are prepared by combustion-frothing method. The processing conditions are: pH=5～6; initial concentration 0.2～0.3mol/L; system temperature 80～90℃; dispersant; frother; ignition temperature 600℃; nitrate-urea system; V(liquid)/V(crucible)=1/10; n(Sr)/n(urea)=1/12 and with a lid on crucible. XRD analysis show that the product has CaAl₂O₄ structure; FS results indicate that the material can be excited from UV to visible light effectively; the 2 excitation peaks at 259.8nm and 323.0nm, emission peak locate 442.8nm; afterglow last up to several hours.Non-grinding long afterglow CaAl₂O₄:Eu²⁺,Dy³⁺ are prepared by microwave-frothing method. The processing conditions are: pH=5～6; initial concentration 0.2～0.3mol/L; system temperature 80～90℃; dispersant; frother; microwave power 800W; radiated time 8min; calcining temperature 1200℃. XRD analysis show that the product has CaAl₂O₄ structure; FS results indicate that the material can be excited from UV to visible light effectively; the 2 excitation peaks at 265.6nm and 326.4nm, emission peak at 442.4nm; afterglow last up to several hours.Non-grinding long afterglow CaAl₂O₄:Eu²⁺,Dy³⁺ are prepared by microwave-combustion method. The processing conditions are: pH=5～6; initial concentration 0.2～0.3mol/L; system temperature 80～90℃; dispersant; frother; microwave power 800W; radiated time 6min; nitrate-urea system; V(liquid)/V(crucible)=1/10; n(Sr)/n(urea)=1/12 and with a lid on crucible. XRD analysis show that the product has CaAl₂O₄ structure; FS results indicate that the material can be excited from UV to visible light effectively; the 2 excitation peaks at 264.1nm and 324.8nm, emission peak at 441.2nm; afterglow last up to several hours.Non-grinding long afterglow CaAl₂O₄:Eu²⁺,Dy³⁺ are prepared by co-precipitation method. The processing conditions are: pH = 10; initial concentration 0.1～0.2mol/L; system temperature 80～90℃; dispersant; frother; additive ingredient; calcining temperature 1200℃. XRD analysis show that the product has CaAl₂O₄ structure; FS results indicate that the material can be excited from UV to visible light effectively; the 2 excitation peaks at 264.0nm and 321.6nm, emission peak at 441.6nm; afterglow last up to several hours.Non-grinding long afterglow Y2O2S:Eu³⁺,Mg²⁺,Ti4+ are prepared by sol-frothing method. The processing conditions are: pH=5～6; initial concentration 0.1～0.2mol/L; system temperature 80～90℃; dispersant; frother; calcining temperature 1100℃. XRD analysis show that the product has Y2O2S structure; FS results indicate that the material can be excited by UV effectively; the 2 emission peaks at 617.8nm and 627.4nm are attributable to 5D0-7F2 of Eu³⁺ ions and 1 peak at 596.8nm is ascribed to Eu³⁺ transition from 5D0-7F1; afterglow last up to several minutes.