(Color online) Photograph of (a) an as-grown TCF:Yb3+ single crystal wafer of 3.8 mol %) and (b) cut and polished oriented prisms under crossed polarizers.
(Color online) XRD pattern of 3.8 mol % TCF:Yb3+ together with the calculated fit.
(Color online) Transmittance spectra of 3.8 and 8.4 mol % TCF:Yb3+ single crystals in comparison.
Emission spectrum after UV excitation at 337 nm for 3.8 mol % TCF:Yb3+ single crystal.
(Color online) Relative IR emission efficiency and total QE as a function of NYb in TCF:Yb3+ single crystals. The inset shows the luminescence intensity as a function of the optical path for an absorbing (977 nm) wavelength and a non-absorbing (542 nm) one.
(Color online) Time resolved luminescence of the Tb3+ 5D4 → 7F5 channel (emission at 542 nm) after excitation at 337 nm for the TCF:Yb3+ crystal family. The inset shows the QE, estimated from the total luminescence of the decay curves, as a function of the NYb.
(Color online) UC emission of Tb3+ 5D4 → 7FJ after 920 nm excitation in the Yb3+ absorption band in TCF:Yb3+ with 8.4 mol % NYb. The inset displays the corresponding power dependence of the UC, indicating the occurrence of two and three IR photon absorption processes.
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