Preparation and Properties of Sunlight Activated Blue Persistent Luminescence Material Ca12Al14O33∶Eu2+,Nd3+
In this thesis,aiming at developing blue persistent luminescence(Pers L)materials that can be ex-cited by sunlight,a series of blue PersL phosphors Ca12Al14O33∶Eu2+,Nd3+was successfully synthesized through high-temperature solid-state reaction method.The emission peak of this material is located at 446 nm.Under the condition of simulated solar radiation,the duration time is increased from 400 to about 6000 s while the initial brightness of material can exceed 500 mcd·m-2 by co-doping Nd3+.By means of the analysis of thermolumines-cence curves,it indicates that co-doping of Nd3+can greatly increase the concentration of shallow traps suitable for Pers L.The trap depth is about 0.7 eV,which is more conducive to the generation of Pers L.F inally,a fea-sible Pers L mechanism was discussed.
blue persistent luminescencetrapsthermoluminescencerare earths
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