(Ce0.67Tb0.33-x)MnxMgAl11O19 phosphor was synthesized by a sol-gel process.
The excitation spectra were characteristic of the Ce3+ cation, while the e
mission spectra consisted of lines from Tb3+ and Mn2+. Mn2+ ion gave green
fluorescence band and concentration quenching occurred when x > 0.09. By an
alyzing the crystal structure of the phosphor, a reasonable explanation is
given for the optical properties of the phosphor. (C) 2001 Elsevier Science
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