Spectroscopic Properties Of Dy3 Research Articles

The spectroscopic properties of Dy3+and Eu3+ co-doped Y3Al5O12 (YAG) phosphors for white LED

Tunable full color emissive Y2.94−xAl5O12: 0.06Dy3+, xEu3+ (YAG: 0.06Dy, xEu) phosphors with emission peaks at 483nm (blue), 582nm (yellow) and 610nm (red) were synthesized by a sol–gel method. The as-synthesized phosphors were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), photoluminescence decay lifetimes, photoluminescence excitation and emission spectra. The results showed that photoluminescence intensity varied with excitation wavelength and the doping concentration of Eu3+. The co-doping with Eu3+ compensated the red emission component of the YAG: Dy3+ phosphor. The chromaticity coordinate of YAG: 0.06Dy, 0.09Eu phosphor (0.3263, 0.3334) was very close to that of the ideal white light (0.3333, 0.3333). Thus, the YAG: 0.06Dy, 0.09Eu phosphor can find potential application in simulating the sunlight artificially through fabricating white light emitters.

White light emission in host-sensitized Dy3+-single-doped NaIn(WO4)2 phosphors

A novel white NaIn1−x(WO4)2: xDy3+ (x=0, 0.02, 0.04, 0.06 and 0.08) phosphors in pure phase were prepared via high temperature solid-state reaction, and luminescent properties of the phosphors were investigated. The crystal structure of the phosphor was characterized by powder X-ray diffraction, and the spectroscopic properties of Dy3+-doped NaIn(WO4)2 were investigated by diffuse reflectance spectra, photoluminescence emission and photoluminescence excitation spectroscopy. Those spectra illustrated that the Dy3+-doped NaIn(WO4)2 phosphors could be efficiently excited by the host-sensitized excitation in the spectral range of 280–350nm, and the host-sensitized excitation is more efficient than the Dy3+ excitation. The 6mol% Dy3+ doping concentration in NaIn(WO4)2 is optimum, and the luminescence concentration quenching occurs beyond the 6mol% concentration. The concentration quenching mechanism could be attributed to the dipole–dipole interaction between the Dy3+ ions. The CIE color coordinate of the 6mol% Dy3+-doped NaIn(WO4)2 is (0.319, 0.325). The present work suggests that Dy3+-doped NaIn(WO4)2 could be a promising host-sensitized phosphor applied in white LEDs, and white emission can be obtained by combining the blue host emission with the yellow Dy3+ emission.

The spectroscopic properties of Dy3+ and Eu3+ co-doped ZnWO4 phosphors

Dy3+ and Eu3+ co-doped ZnWO4 phosphors with different doping concentrations were synthesized by a hydrothermal method. The as-prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and photoluminescence (PL) spectra. The results showed that the doping concentrations of Eu3+ could affect the blue and yellow emission intensities of Dy3+, and tunable emission color could be obtained by adjusting the doping concentrations of Eu3+. Based on the excitation/emission spectra of Dy3+/Eu3+ co-doped ZnWO4 and the energy levels of Dy3+ and Eu3+, the photoluminescence process in the Dy3+/Eu3+ co-doped ZnWO4 system was discussed in detail.

Mid-infrared emission in Dy:YAlO_3 crystal

In this work, we report on the spectroscopic properties of Dy3+ doped YAlO3 crystal grown by Czochralski technique. The Judd-Ofelt theory was performed based on the measured polarized absorption spectra. Under optical pumping at 1300 nm, Dy:YAP crystal exhibited a broad MIR emission centered at 3020 nm, with a bandwidth of 520 nm at full width half maximum. The decay lifetime of the 6H13/2 level was measured to be 8.88 ms, and the corresponding quantum efficiency evaluated was 57.9%. The studied optical gain properties indicate that Dy:YAlO3 crystal could be a potential candidate for solid-state mid-infrared laser applications.

Spectroscopic properties of Dy3+ ions in CaTiO3 nano-perovskites

The spectroscopic properties of Dy3+ ions in CaTiO3 perovskite were measured and analyzed. The influence of dopant concentration on luminescence properties of the samples were investigated. The energy levels of Dy3+ ions in CaTiO3, the CIE 1931 chromatic coordinates of emission and also the cross-relaxation factor were obtained. The most intensive emission was observed for the sample doped with 1% of Dy3+.

Spectroscopic investigation of Dy3+-doped Li2Gd4(MoO4)7 crystal for potential application in solid-state yellow laser

Dy3+:Li2Gd4(MoO4)7 crystal with dimensions of ∅20×25mm3 has been grown by the Czochralski method. The spectroscopic properties of Dy3+:Li2Gd4(MoO4)7 crystal have been investigated. Based on the analysis of polarized absorption spectra in the framework of the Judd–Ofelt theory, the main spectroscopic characteristics, including the phenomenological intensity parameters, spontaneous transition probabilities, fluorescence branching ratios and radiative lifetimes of Dy3+ in the crystal, have been determined. The emission cross-sections for the 4F9/2→6H13/2 transition of special interest for laser application have been calculated using the Füchtbauer–Ladenburg (F–L) equation. The fluorescence and radiative lifetimes of 4F9/2 manifold are equal to 126.5μs and 201.1μs, respectively, which mean the quantum efficiency is 62.9%. The results propose the possibility of Dy3+:Li2Gd4(MoO4)7 crystal for solid-state yellow laser pumped by commercially available blue laser diodes.