Full text loading...
XRD pattern of nanophosphors. Inset shows typical SEM image of the nanophosphors.
(Color online) (a) PLE spectra of the emission (, solid line) and the : emission (, dotted line) and (b) visible-NIR PL spectrum upon excitation of (: ) of .
(Color online) Dependence of the green- and NIR-emission intensities on the doping concentration in nanophosphors. Inset shows schematic energy levels of the nanophosphors showing possible mechanisms for a NIR QC under excitation of visible with .
(Color online) Decay lifetimes of the luminescence under excitation of . The different fractions of in the samples are indicated in the figure. Inset shows the TE, QE, and decay lifetime as a function of the doping concentration.
(Color online) Transfer efficiency and decay lifetime as a function of the concentration in . The calculated transfer efficiencies beyond the CQ are also shown (asterisks).
Article metrics loading...