Synthesis and Luminescent Properties of $Eu^{3+}$ Doped Crystalline Diphosphate $Na_2ZnP_2O_7$

Undoped and $Eu^{3+}$-doped disodium zinc diphosphate $Na_2ZnP_2O_7$ (NZPO) single crystals are grown by the Czochralski method. X-ray diffraction, Fourier transform infrared and Raman techniques were used to check the crystallographic structure. Excitation and emission spectra were measured at room temperature and studied. The $Eu^{3+}$ ions occupy a non-centrosymmetric site with different coordination number. Very efficient energy transfer from $O-Eu^{3+}$ band state to $Eu^{3+}$ excited energy levels is highlighted.