Luminescent properties of Gd₂SiO₅powder doped with Eu³⁺under VUV–UV excitation

Abstract

The luminescent properties of Gd 2 SiO 5 powder crystals doped with Eu 3+ were investigated using synchrotron radiation and a VUV laser (157.6 nm) as excitation sources. The excitation spectra in the range of 160-330 nm monitoring the red emission from Eu 3+ ions reveal bands corresponding to intraconfigurational 4f-4f transitions of Gd 3+ and charge transfer states (CTS) of Eu 3+ -O 2− , as well as interband transitions of the Gd 2 SiO 5 host, indicating an efficient energy transfer process from the host or directly from Gd 3+ to Eu 3+ ions. The inspection of 5 D 0 → 7 F 0 emission lines from Eu 3+ ions suggests that there are three inequivalent sites for Eu 3+ in this host. The excitation band around 215 nm and the unique emission features associated with this excitation band were attributed to one of the inequivalent Eu 3+ sites, which exhibits an unusually weak coupling with host lattice. The energy levels of Eu 3+ in the Gd 2 SiO 5 host were tentatively assigned according to the laser excited emission spectra.

Luminescence and structural properties of Gd2SiO5:Eu3+ nanophosphors synthesized from the hydrothermal obtained silica sol

“…Different transitions occurring from the 5 D 1 emitting level are reported in the picture. We can underline that these emission spectra are quite different in shape to those recently obtain on powder [18]. At average size of 10 nm, it could be possible to observed size effect on the emission bands leading to for instance a broadening of the emission, a modification of the absorption features and a slight modification of the lifetime [19].…”

Effect of substitution of lutetium by gadolinium on emission characteristics of (Lu_xGd_1-x)_2SiO_5: Sm^3+ single crystals

“…Later on, numerous papers were devoted to spectroscopic investigation of oxyorthosilicate crystals doped with various rare earth ions, e.g. Pr 3+ [3], Dy 3+ [4,5], Eu 3+ [6,7], Sm 3+ [8], or Tm 3+ [9]. When doped with ytterbium ions the LSO crystal proved to be a promising laser material emitting in near infrared [10,11].…”

Czochralski Growth and Optical Properties οf (Lu_{x}Gd_{1-x})_2SiO_5 Solid Solution Crystals Single Doped with Sm^{3+} and~Dy^{3+}

“…In several papers, spectroscopic features of praseodymium-doped Y 2 SiO 5 crystals have been investigated aiming at assessment of their application as fast scintillators [10]. Also, phenomenon of quantum cutting in europium-doped Gd 2 SiO 5 has been examined to nd out whether this system may be promising as VUV-excited visible phosphor [11]. …”