We have investigated the effect of co-doping Yb –Tm on the cooling parameters : and EQE. We have studied six different samples, three single doped with 5% and 10% Yb3+ and three co-doped with Tm3+: 16 ppm, 40 ppm and 80 ppm, respectively.
The samples have been cut and optically polished for cooling investigation. We obtained for a three co-doped samples an interesting effect on cooling parameters: the decrease of the , the increase of EQE and the red shift of the peak wavelength. To understand these effects it has been studied the absorption and emission spectroscopy. In particular we studied the emission of the manifolds of Tm3+ (1G4 and 3H4) and the energy transfer mechanisms between Yb-Tm to investigate the variation of cooling parameters. This study continued in-depth both with dynamic spectroscopic of Yb 3+ and Tm3+ levels in single and co-doped samples to put in evidence the cross-relaxation effect on the levels and possible effects caused by impurities transitions metals.
Mauro Tonelli, Giovanni Cittadino, Azzurra Volpi, and Alberto Di Lieto, "Effect on cooling parameters of LiYF4 co-doped with Yb3+ and Tm3+ (Conference Presentation)," Proc. SPIE 10550, Optical and Electronic Cooling of Solids III, 1055004 (Presented at SPIE OPTO: January 30, 2018; Published: 14 March 2018); https://doi.org/10.1117/12.2288250.5751548056001.
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