The single crystal growth of stoichiometric host luminescent crystal Na_5Eu(WO_4)_4 has been investigated. Using Na_2WO_4 as a flux,the optimum conditions to grow a pure single crystal by flux-slow-cooling method have...The single crystal growth of stoichiometric host luminescent crystal Na_5Eu(WO_4)_4 has been investigated. Using Na_2WO_4 as a flux,the optimum conditions to grow a pure single crystal by flux-slow-cooling method have been determined.A high optical quality single crystal of dimention 4.5 mm has been grown,which is the largest one as we know so far.The micro-hardness of Na_5Eu(WO_4)_4 single crystal is 3.46×10~3 MPa.Its refractive index is 1.81 in white light wavelength region and the specific gravity is 5.65 g/cm^3.The fluorescent and excitation spectra have been determined and the reason of the fluorescent quench of ~5D_2 and ~5D_1 to ~7F_j of Eu^(3+)can be explained as multi-phonon non-radiation transition.展开更多
文摘The single crystal growth of stoichiometric host luminescent crystal Na_5Eu(WO_4)_4 has been investigated. Using Na_2WO_4 as a flux,the optimum conditions to grow a pure single crystal by flux-slow-cooling method have been determined.A high optical quality single crystal of dimention 4.5 mm has been grown,which is the largest one as we know so far.The micro-hardness of Na_5Eu(WO_4)_4 single crystal is 3.46×10~3 MPa.Its refractive index is 1.81 in white light wavelength region and the specific gravity is 5.65 g/cm^3.The fluorescent and excitation spectra have been determined and the reason of the fluorescent quench of ~5D_2 and ~5D_1 to ~7F_j of Eu^(3+)can be explained as multi-phonon non-radiation transition.
