Optical spectroscopy of CaMoO4:Dy3+ single crystals

Abstract

CaMoO4 single crystals doped with Dy3+ were grown from sodium molybdate flux. Their absorption and visible emission spectra and decay curves were measured at different temperatures from 10 to 298 K. The complete energy level scheme has been deduced from the low-temperature measurements. The Judd-Ofelt parametrization scheme has been applied to the analysis of the room temperature absorption spectra. The calculated radiative lifetime of the 4F9/2 state is 152±5 µs, and it is in reasonable agreement with the experimental data. The decay curves measured in the 10-170 K temperature range are not exponential and obey the Inokuti-Hirayama model for energy transfer for an electric quadrupole-quadrupole interaction in the absence of diffusion among the donors. All spectral features are strongly affected by an inhomogeneous broadening connected with the `disordered crystal' character of the title compound.

The Recent Development of Rare Earth-Doped Borate Laser Crystals

“…The absorption cross-section was measured to be abs = 3.37 × 10 −20 cm 2 . [7] This stronger absorption band corresponding to the transition 4 I 9/2 2 H 9/2 is very favorable for commercial GaAlAs diode pumping [4] . The room temperature emission spectrum with the light perpendicular to <1 1 1> planes is presented in Fig.4 Fig.…”

“…The introduction of Na + as charge compensator results in the disorder in the local crystal fields acting on the optically active ions. [16] Therefore, the absorption and emission peaks can become broadening. [17 ] The full width at half maximum (FWHM) of the absorption peak at 808 nm is about 19 nm, which is larger than that of Nd 3+ :GdVO 4 (FWHM is 4 nm) [18] .…”

Fabrication of Luminescent Antireflective Coatings with CaMoO4:Eu3+/Ag Composite Structure

“…They also exhibit an interference pattern due to the high refractive index of the films. Because of the composite structure, the actual refractive index of the films should be between 2.00 (crystalline CaMoO4) [10,12] and 1.645 (amorphous Al2O3) [32]. A larger decrease of the transmittance of Film-D1 was caused by the SPR absorption and/or the light scattering by the silver nanoparticles.…”

“…Fresnel reflection occurs at the air/film interface, where the reflectance depends directly on the refractive index of thin films. When applying CaMoO 4 to thin-film phosphors, its high refractive index (1.98-2.00) [10,12] gives the reflectance of approximately 11% at the film surface against the incident light. The light emitted from thin-film phosphors is also influenced by reflection, which has already been a major problem in light-emitting semiconductor devices [13].…”

Czochralski growth and characterization of Dy: La3Ga5.5Nb0.5O14 single crystals

“…Transitions from the excited 4 F 9/2 state extend emission spectrum of Dy 3+ to the visible region and consist of several lines in the blue, green and red regions [13]. Moreover, Dy 3+ yellow laser emission using the 4 F 9/2 -6 H 13/2 channel has been demonstrated [14][15][16], this justify to investigate the laser properties of Dy 3+ doped LGN and its analogues. In this work, we will demonstrate the successful growth of 1.0% Dy doped LGN single crystal (1.0% Dy:LGN) by Czochralsiki (Cz) technique.…”