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In our effort to develop a new kind of detector for low-energy, low-rateenergy deposition events we have investigated the cathodo- andradioluminescence of Ho:YAG and Ho:YLF single crystals in an extendedwavelength range from $200\,$nm to $2200\,$nm. The emission spectra of bothcrystals show a much more intense emission in the infrared range than in thevisible one. We estimate an infrared light yield of $40\,$photons/keV whenexciting the crystals with X-rays of energy $\approx 30\,$keV. The main reasonof this high value is due to the Ho$^{3+}$ ions energy levels scheme thatallows efficient cross relaxation processes to occur even at low dopantconcentration.

Infrared and visible scintillation of Ho$^{3+}$-doped YAG and YLF crystals