LUMINESCENT PROPERTIES OF M Al 2O 4∶Eu 2+ 、 RE 3+
Zhang Tianzhi Su Qiang Wang Shubin (Laboratory of Rare Earth Chemistry and Physics, Chinese Academy of Sciences, Changchun Institute of Applied Chemistry, Changchun 130022)
The luminescent and long phosphorescent properties of M Al 2O 4∶Eu 2+ 、 RE 3+ ( M =Mg, Ca, Sr, Ba; RE=Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) with distorted stuffed tridymite were researched. The luminescence attributed to the 4f 5d transition of Eu 2+ . The incorporation of RE 3+ ion into the M Al 2O 4∶Eu 2+ system was as the auxiliary activator which provided the proper trapping levels. We could not see the luminescence of RE 3+ though excited with the characteristic excitation wavelength of RE 3+ . We analysed the luminescent and long phosphorescent properties of this type of host codoped with rare earths, and made the conclusion that Pr, Nd, Dy, Ho, Er could effectively prolong the life time of M Al 2O 4∶Eu 2+ system. The long phosphorescent rule is SrCaBa.
【CateGory Index】： TB39