[en] It was recently proposed to use scintillating crystals incorporating a large amount of ¹¹⁵In for the detection of low-energy solar neutrinos through Raghavan's reaction. We report here on recent progress in feasibility studies, i.e. crystal growth of transparent undoped and doped single crystals of indium compounds. We also discuss some aspects related to the luminescence of scintillators at low temperature, in connection with the proposal to develop a luminescent bolometer for particle identification through the heat/light ratio