XRD patterns of YVO4: Yb3+/Bi3+ samples. The tetragonal-phase YVO4 pattern from the JCPDS database is also shown for reference. The right inset is the partial magnification peaks of the as-prepared samples. The left inset shows the TEM of the sample.
(a) The scheme of energy transfer process from Bi3+ to Yb3+. (b) the scheme of mechanism for downconversion with Nd3+ and Yb3+ couple.
(a) Visible-infrared emission spectra of YVO4:(0%-20%)Yb3+/Bi3+ samples upon excitation of 355 nm. (b) The integrated visible and infrared emissions dependence on the concentration of Yb3+.
Fluorescence dynamic curves of Bi3+ emission at 535 nm under the excitation of 355 nm for YVO4: (0%–20%)Yb3+/Bi3+ samples. The inset shows the lifetime of the different concentration of Yb3+.
Excitation spectra of YVO4: 1% Nd3+, 10% Yb3+ sample monitoring the emission at 983 nm, and emission spectra of the sample excited with 478 nm.
NIR-QC of Bi3+,Yb3+ ion pairs doped in different materials: hosts, concentration, and estimated optimum QE by luminescent dynamics.
Article metrics loading...
Full text loading...