Optical spectroscopy of heavily Ho3+-doped BaY2F8 crystals

Tsuboi, Taijū; Jang, Kyoung Hyuk; Poloşan, Silviu; Shimamura, Kiyoshi; Bettinelli, Marco; Seo, Hyo Jin

doi:10.1016/j.jlumin.2010.11.020

Cited by 20 publications

(6 citation statements)

References 24 publications

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“…However, Yb 3+ , an important sensitizer, has only one excitation at 980 nm in the NIR region. Its UC efficiency is limited by NIR radiation source excitation, which is mainly due to its extremely weak absorption in the NIR wavelength range 34 . We conducted researches on core-shell microcrystal of β-NaYF 4 :Ho 3+ @TiO 2 and on the use of Vis as a photocatalyst 35 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Reduced Grapheme Oxide as A Platform for loading β-NaYF4:Ho3+@TiO2Based on An Advanced Visible Light-Driven Photocatalyst

Fan

2017

Sci Rep

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In this paper a novel visible light-driven ternary compound photocatalyst (β-NaYF4:Ho3+@TiO2-rGO) was synthesized using a three-step approach. This photocatalyst was characterized using X-ray diffraction, Raman scattering spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Transmission electron microscopy, X-ray photoelectron spectroscopy, fluorescence spectrometries, ultraviolet-visible diffuse reflectance spectroscopy, Brunauer–Emmett–Teller surface area measurement, electron spin resonance, three-dimensional fluorescence spectroscopy, and photoelectrochemical properties. Such proposed photocatalyst can absorb 450 nm visible light while emit 290 nm ultraviolet light, so as to realize the visible light-driven photocatalysis of TiO2. In addition, as this tenary compound photocatalyst enjoys effecitve capacity of charge separation, superior durability, and sound adsorb ability of RhB, it can lead to the red shift of wavelength of absorbed light. This novel tenary photocatalyst can reach decomposition rate of RhB as high as 92% after 10 h of irradiation by visible-light Xe lamp. Compared with the blank experiment, the efficiency was significantly improved. Recycle experiments showed that theβ-NaYF4:Ho3+@TiO2-rGOcomposites still presented significant photocatalytic activity after four successive cycles. Finally, we investigated visible-light-responsive photocatalytic mechanism of the β-NaYF4:Ho3+@TiO2-rGO composites. It is of great significance to design an effective solar light-driven photocatalysis in promoting environmental protection.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Reduced Grapheme Oxide as A Platform for loading β-NaYF4:Ho3+@TiO2Based on An Advanced Visible Light-Driven Photocatalyst

Fan

2017

Sci Rep

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“…non radiative multi phonon relaxations from the 5 I 5 and 5 I 6 states more possible in heavily doped crystals than the radiative transitions to the ground state 5 I 8 [17] we can see that the FWHM of the sample is about 170.9 nm at 3.9 μm. Figure 8 shows the energy level of Ho 3+ .…”

Section: Infrared Emission Propertiesmentioning

confidence: 76%

Optical spectroscopy of low-phonon Ho3+ doped BaY2F8 single crystal

Zeng

Lin

et al. 2014

Russ. J. Phys. Chem.

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The Ho:BaY 2 F 8 crystal was grown by Czochralski method. The crystal phase structure and absorption spectra were tested, the absorption peak exists near 899 nm, the absorption cross section was 1.27 × 10 -21 cm 2 . The emission spectra of crystals in the vicinity of 2 and 3.9 μm were measured, the 2 μm near infrared light induced by 5 I 7 5 I 8 transition of Ho 3+ ions was observed, as well as the fluorescence output at 3.9 μm ( 5 I 5 5 I 6 ), emission cross section at 3.9 μm was calculated to be 0.86 × 10 -21 cm 2 . We suppose that the Ho:BaY 2 F 8 crystal has a large application prospect for the 2-4 μm wavelength near infrared laser.

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“…A total of 10 characteristic absorption bands from the ground state 5 I 8 of Ho 3+ ion have been observed. [25,26] The strong absorption peak located at around 298 nm originates from the electronic 4f-4f transitions of the Ho 3+ ion. The weak absorption bands due to the 5 The emission spectrum of KHoP 4 O 12 at room temperature excited with 330 nm is shown in Figure 5.…”

Section: Luminescence Propertiesmentioning

confidence: 99%

Structural, Luminescence, and Electronic Properties of Potassium Holmium Cyclotetraphosphate KHoP₄O₁₂: Experiment and Theory

Zhu

Qian

Zhu

et al. 2014

Zeitschrift anorg allge chemie

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Abstract. The chemical preparation, structure, luminescence, and electronic properties are given for a new potassium holmium cyclotetraphosphate KHoP 4 O 12 , a promising optics material for applications. Single-crystal X-ray diffraction analysis shows that the newly synthesized compound crystallizes in the monoclinic system with space group C2/c and Z = 4. [P 4 O 12 ] 4-anionic rings and HoO 8 polyhedra display a three-dimensional (3D) framework by corner-sharing. The

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Optical spectroscopy of heavily Ho3+-doped BaY2F8 crystals

Cited by 20 publications

References 24 publications

Synthesis of Reduced Grapheme Oxide as A Platform for loading β-NaYF4:Ho3+@TiO2Based on An Advanced Visible Light-Driven Photocatalyst

Synthesis of Reduced Grapheme Oxide as A Platform for loading β-NaYF4:Ho3+@TiO2Based on An Advanced Visible Light-Driven Photocatalyst

Optical spectroscopy of low-phonon Ho3+ doped BaY2F8 single crystal

Structural, Luminescence, and Electronic Properties of Potassium Holmium Cyclotetraphosphate KHoP₄O₁₂: Experiment and Theory

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Optical spectroscopy of heavily Ho3+-doped BaY2F8 crystals

Cited by 20 publications

References 24 publications

Synthesis of Reduced Grapheme Oxide as A Platform for loading β-NaYF4:Ho3+@TiO2Based on An Advanced Visible Light-Driven Photocatalyst

Synthesis of Reduced Grapheme Oxide as A Platform for loading β-NaYF4:Ho3+@TiO2Based on An Advanced Visible Light-Driven Photocatalyst

Optical spectroscopy of low-phonon Ho3+ doped BaY2F8 single crystal

Structural, Luminescence, and Electronic Properties of Potassium Holmium Cyclotetraphosphate KHoP4O12: Experiment and Theory

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Structural, Luminescence, and Electronic Properties of Potassium Holmium Cyclotetraphosphate KHoP₄O₁₂: Experiment and Theory