Rare-earth doped long afterglow silicate luminescent properties and regulation
Luminescence is then able to absorb energy in the form of energy to light a slow release material. As a special energy storage material, in recent years, concern about long afterglow material, its application has been extended to transportation, construction, watches, clothing and other daily living. Currently, the aluminate long afterglow luminescent material has excellent performance, has been widely used. However, its poor resistance to water, easily deliquescence, water decomposition of the luminous efficiency. Thus, this system prepared a series of long afterglow silicate materials, the luminescence properties of rare earth doped silicate and blue and green long afterglow of the regulation. The material stability, water resistance, and thus greatly expand the scope of application of long afterglow.
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Consider the practical application of long afterglow silicate to improve their Yuhui Jiang degree, we first prepared by high temperature solid a series of P ~ (5 +) doped Blue Long Afterglow Sr_2MgSi_2O_7: Eu ~ (2 +), Dy ~ (3 +), aB ~ (3 +), bP ~ (5 +), explore the P ~ (5 +) modulation of its Yuhui Jiang law degree. As P ~ (5 +) introduction, we observed the sample Yuhui Jiang increases, the decay time (decay time) shorter. This shows that P ~ (5 +) can effectively regulate the introduction of the depth of trap levels, the rate of change in the trap to release electrons. The results show that by P ~ (5 +) doping control can be realized on the Sr_2MgSi_2O_7: Eu ~ (2 +), Dy ~ (3 +) in the afterglow characteristics of the regulation. Long-lasting persistence of adjustable material help in different lighting and display industry on the application. Especially in low light illumination, the afterglow for more than 12 hours of long afterglow will have a huge scalability, greater application.
Secondly, the use of high temperature solid state synthesis of rare earth (Tb, Sm, Ce, Dy, Nd) doped CaAl2Si2O8: Eu and CaAl2Si2O8: Eu, Mn and other aluminosilicate samples. The stability of the sample with a silicate material, and its performance close to the aluminate long afterglow materials. The results showed that the co activator Dy ~ (3 +), Nd ~ (3 +) can extend the Blue Long Afterglow CaAl2Si2O8: Eu afterglow time, and Nd ~ (3 +) more effective than Dy ~ (3 +) better. This is because the Nd ~ (3 +), the traps depth than Dy ~ (3 +) produced deeper trap depth. In addition, Ce ~ (3 +), Tb ~ (3 +) and Sm ~ (3 +) doping to improve the fluorescent material Ca_ (0.74) Al_2Si_2O_8: 0.01Eu ~ (2 +), 0.25Mn ~ (2 +) of the White color has to help, including Sm ~ (3 +) ions most obvious effect.
In addition, by increasing CaO, SrO, BaO and other reactants, instead of toxic Cd2 + doping method, prepared by high temperature solid non-toxic, environmentally friendly new green rare earth doped long afterglow M (Ca, Sr, Ba) O · 2ZnO · 2SiO_2: Mn, RE. M = Sr, the samples have good persistence characteristics, and, Mn ~ (2 +) concentration of 1mol%, the afterglow characteristics of the best. It was found that the afterglow properties of the sample under the conditions better than the same prepared Zn_2SiO_4: Mn samples, the reason comes down to, in the sintering process of Sr ~ (2 +) replaced Zn ~ (2 +), increased the number of the trap Zn_2SiO_4 or deepen the depth of the trap, resulting in performance improvement afterglow. On this basis, further comparison Sm ~ (3 +), La ~ (3 +), Tb ~ (3 +) doping on the afterglow properties of the sample. It was found that the introduction of Tb ~ (3 +) can be extended when the afterglow decay time. The result is light and Yu Huimin find the right agent to provide a reference.
