SINGLE-CRYSTAL GROWTH AND SPECTROSCOPIC PROPERTIES OF KZNF3-EU3+

Single crystal of KZnF3 : Eu3+ has been grown by means of Bridgman-Sto ckbarger technique in Ar atmosphere, The emission and excitation spect ra of europium ion were measured, The results show that a small amount of Eu2+ exists in the crystal, The existence of Eu2+ ions was also co nfirmed by ESR data, The valence change of Eu ions during the crystal growth is due to unequivalent substitution of Eu3+ ions for the lattic e ions. The sites possibly occupied by Eu ions in this crystal were al so discussed.