| 摘要 |
PROBLEM TO BE SOLVED: To obtain a Tb-activated rare earth alumino-borate fluorescent substance having a high efficiency under excitation with ultraviolet rays within the vacuum ultraviolet region (wavelength: <=200 nm) and low-energy electron beams. SOLUTION: This fluorescent substance comprises the general compositional formula LnAl3B4O12:Tb (wherein Ln is at least one kind of element selected from La, Y, Gd, Lu and Sc), more preferably the compositional formula (Y1-x-yGdxTby)Al3B4O12 (wherein 0<=x<=0.85; and 0.15<=y<=0.65).
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