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(Color online) Schematic energy level diagrams of GAB:Pr,Yb, GAB:Tb,Yb, and GAB:Tm,Yb, showing the concept of NIR QC with visible excitation at 489, 485, and , respectively.
(Color online) Visible-NIR PL spectra of (a) (, 2, 10, 20, and 30) , (b) GAB:1%Tb,2%Yb , and (c) GAB:1%Tm,2%Yb . PLE spectra of (, Tb, and Tm) (solid line) and (dotted line) are also given.
(Color online) Decay lifetimes of the luminescence under excitation of . The different fractions of in the samples are indicated in the figure. Inset shows decay curves in semilogrithmic plot.
ETE and decay lifetimes as a function of the doping concentration.
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