Investigation of upconversion mechanism in ho3+ doped CsCdCl3 crystal

CsCdCl3 crystal belongs to the perovskit type AMX3 family, has got a suitable array structure in terms of investigation for both energy transfer and upconversion processes in subject of the interactions between dopant ion and host crystal lattice and this crystal contains both C3v and D3d symetry properties together. In this study, Ho3+ doped CsCdCl3 crystal has been grown by Bridgman-Stockbarger method, and its emission and excitation spectrums are taken on the optical spectroscopy measurement setup in our laboratory. The results obtained from our measurements are analyzed by using group theory, and as long as our opportunities permit, electronic energy levels of Ho3+ ions in this crystal are determined. Some tests are performed in terms of investigation energy transfer and upconversion mechanism. Hereby, energy levels of the Ho3+ in CdCl3 crystal are determined roughly, but a separation of the energy levels of every center was not possible within our experimental possibilities. On the other hand, is a clear signal between the electronic energy levels of the crystal lattice and an energy level of the Ho3+ ion identified which proves an energy transfer; but no signal is detected about an upconversion process.