Vibronic and Raman spectra of Y(Eu3+) polytantalate, Eu x Y1−x Ta7O19

Luminescence spectra, luminescence excitation spectra, and Raman spectra of polycrystalline Eu0.9Y0.1Ta7O19 were studied. Zero-phonon lines and vibronic sidebands of the 7 F 0−5 D 2 and 7 F 0−5 D 0 transitions were identified and the Stark splittings of several 7 F J and 5 D J , states of Eu3+ ions were investigated. The details of the structure of lanthanide polytantalates and the reduction of the luminescence quenching are discussed.