The photoluminescence （PL） characteristics of Eu^3＋ and Li^＋ co-doped ZnO PL materials against heat-treatment temperature were discussed. The PL xerogel and powder samples were prepared by solgel process. The emis...The photoluminescence （PL） characteristics of Eu^3＋ and Li^＋ co-doped ZnO PL materials against heat-treatment temperature were discussed. The PL xerogel and powder samples were prepared by solgel process. The emission spectra of all samples showed two broad bands peaking at 590 nm and 620 nm under UV-Vis excitation. But the relative intensity of red PL （620 nm） was much greater than that of green PL （590 nm） of the same sample, that s to say, the red color was the main luminescence. With heat-treatment temperature increase, the two kinds of colors PL intensity decreased, and both the red and green PL intensity of the xerogel samples was much greater than those of powder samples respectively. The XRD patterns revealed that Eu^3＋ ions were successfully incorporated in ZnO crystals in xerogel samples. When heat-treatment temperature reached 350 ℃, the Eu^3＋ began to separate out of the ZnO crystals and Eu2O3 crystals came into being. When the powder sample was subjected to UV-Vis excitation, the energy transfered from the host ZnO emission to Eu^3＋ became weaker than the xerogel sample.展开更多
The luminescent properties of Sr2.97MgSi2O8：Eu^2＋0.1 phosphors were investigated with different Ln^3＋0.02（Ln^3＋： Dy^3＋, Er^3＋, Ho^3＋） co-dopants. The co-dopants had no influence on both the structure of the ...The luminescent properties of Sr2.97MgSi2O8：Eu^2＋0.1 phosphors were investigated with different Ln^3＋0.02（Ln^3＋： Dy^3＋, Er^3＋, Ho^3＋） co-dopants. The co-dopants had no influence on both the structure of the lattice and the position of the emission peak. However, the afterglow properties of samples were enhanced with different co-dopants. The afterglow duration of the Dy^3＋ co-doped sample was longer than that of the others. Furthermore, the co-doping samples had stronger thennolmninescence （TL） intensity and therefore longer afterglow duration. At last, the self-reduction of Eu^3＋→Eu^2＋ was observed in an silicate compound of Sr3 xMgSi2Os：xEu phosphor in air condition. This is the first time to show a blue long afterglow phosphor synthesized avoiding reducing atmosphere.展开更多
基金the National Defense Foundation Research Item of China(No.K 1203061109)
文摘The photoluminescence （PL） characteristics of Eu^3＋ and Li^＋ co-doped ZnO PL materials against heat-treatment temperature were discussed. The PL xerogel and powder samples were prepared by solgel process. The emission spectra of all samples showed two broad bands peaking at 590 nm and 620 nm under UV-Vis excitation. But the relative intensity of red PL （620 nm） was much greater than that of green PL （590 nm） of the same sample, that s to say, the red color was the main luminescence. With heat-treatment temperature increase, the two kinds of colors PL intensity decreased, and both the red and green PL intensity of the xerogel samples was much greater than those of powder samples respectively. The XRD patterns revealed that Eu^3＋ ions were successfully incorporated in ZnO crystals in xerogel samples. When heat-treatment temperature reached 350 ℃, the Eu^3＋ began to separate out of the ZnO crystals and Eu2O3 crystals came into being. When the powder sample was subjected to UV-Vis excitation, the energy transfered from the host ZnO emission to Eu^3＋ became weaker than the xerogel sample.
基金supported by National Natural Science Foundation of China (21271049,21071034)
文摘The luminescent properties of Sr2.97MgSi2O8：Eu^2＋0.1 phosphors were investigated with different Ln^3＋0.02（Ln^3＋： Dy^3＋, Er^3＋, Ho^3＋） co-dopants. The co-dopants had no influence on both the structure of the lattice and the position of the emission peak. However, the afterglow properties of samples were enhanced with different co-dopants. The afterglow duration of the Dy^3＋ co-doped sample was longer than that of the others. Furthermore, the co-doping samples had stronger thennolmninescence （TL） intensity and therefore longer afterglow duration. At last, the self-reduction of Eu^3＋→Eu^2＋ was observed in an silicate compound of Sr3 xMgSi2Os：xEu phosphor in air condition. This is the first time to show a blue long afterglow phosphor synthesized avoiding reducing atmosphere.
