Study Of Water-resistant And Organics Miscibile SAO-ED Luminescent Phosphor

Aimed to improve the water-resistance and organics miscibility of inorganic longafterglow phosphor, the polymer-grafted long afterglow phosphors were synthesized in thisthesis. There are unsaturated metal ions on the surface of rare earth ions activated alkali earthaluminate phosphor which can coordinate with organic ligands. The ligands having two ormore coordinative groups were introduced onto the surface of rare earth ions activated alkaliearth aluminate phosphor by coordination bond to form coordinated long afterglow phosphor.And then the stable polymers were introduced, the formed phosphors have good waterresistance and miscibility with organics.Single phased SrAl₂O₄:Eu²⁺,Dy³⁺ (SAO-ED) was synthesized by a newsol-gel-microwave method. Compared with traditional solid-sate method, sol-gel-microwavemethod can synthesize SAO-ED at lower temperature (900℃) and shorter time(30min). Theluminescent properties of the product were comparative with the samples prepared bytraditional method at 1400℃, and the obtained samples can reachμm-nm without high energygrinding. The effects of the microwave calcining temperature, constant calcining time, heatingrate and cooling rate on the microstructure and luminescent properties of products weresystematically investigated.The ligands which have two or more coordinative groups such as multi-carboxylicacids(tartaric acid, citric acid),β-diketones (acetylacetate), heterocyclic compounds includingN(phen, 8-hydroxyquilino) and schiff base were used to coordinate with the ions on thesurface of SrAl₂O₄:Eu²⁺, Dy³⁺ in the presence of alkali to form organic ligands coordinatedphosphor. The coordination of ligands with SAO-ED was characterized by FT-IR spectra.The bifunctional ligand 3-allyl-2, 4-pentanedione(APD) having both polymerizable groupand coordinative groups was selectively synthesized in this thesis. Acetylacetate reacted withallyl chlorine in the presence of KI as catalyst in the solution of sodium ethanol in ethanol and3-allyl-2, 4-pentanedione(APD) was obtained.The polymer-grafted rare earth activated alkali earth aluminate long afterglow phosphorby coordination bond which has good properties was synthesized. Solution-masspolymerization and precipitation polymerization method were used to prepare the polymergrafted SAO-ED. The effect of dosage of initiator and time of polymerization on themolecular weight of polymer and conversion of monomer were discussed in detail. The structure and properties of the product were characterized by Spectrophotometer(F-4500 FL), Spectrometer (LS-100), FT-IR, XRD and GPC.The water resistance of the polymer-grafted SAO-ED was investigated by measuringbrightness of slice samples after being immersed in water for different time, the resultsshowed that the brightness of polymer-grafted SAO-ED did not decrease in water for 90days.The dispersivity and sedimentation velocity of the polymer grafted SAO-ED in nitrocellulosepaint were measured to investigate the miscibility of the polymer grafted SAO-ED withorganics, the homogenous phase mixture was obtained and no phase separation occurred fortwo months.The obtained polymer-grafted SAO-ED was used to prepare luminescent painting, inkingand printing past. The luminescent performance, aging properties and water resistantproperties of the luminescent painting were investigated and compared with that prepared bySAOoED; The luminescent properties of the luminescent inking were studied; Theluminescent properties, boiling washing fastness and rubbing fastness of the luminescentprinting were also investigated. The results showed that the polymer-grafted SAO-ED hadsatisfactory applicability.