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A novel terbium (Tb 3+ ) and ytterbium (Yb 3+ ) co-doped optical quality CsGd(MoO 4 ) 2  single crystals were grown by the low-thermal-gradient Czochralski method. Photoluminescence spectra were measured and studied for Tb 3+ – Yb 3+  doubly doped CsGd(MoO 4 ) 2  crystals at 77–340 K temperature range. Under 330 nm excitation the main peaks of Tb 3+  and Yb 3+  emission were observed. Decay curves were obtained for the energy levels  5 D 4  of Tb 3+  and  2 F 7/2  of Yb 3+  in CsGd(MoO 4 ) 2  crystals. Decay time for Tb 3+  transitions significantly varies at temperatures close to ambient. Such behaviour allows to assume perspective application of this effect for non-contact luminescence lifetime thermometry. The emission colour chromaticity coordinates of CsGd(MoO 4 ) 2:  Tb 3+  -Yb 3+  crystals are close to SMPTE (Society of Motion Picture and Television Engineers) standard for green colour, as shown on CIE 1931 diagram. Correlated colour temperature varies from 5538 K at 77 K to 4297 K at 340 K.

Energy transfer in Tb 3+ - Yb 3+ doubly doped CsGd(MoO 4 ) 2 single crystals for contactless thermometry, solid-state lighting and solar cells