Investigation on the Preparation and Properties of Monodispersed Spherical Y2O3:Dy3+ Phosphor

2017 ◽  
Vol 726 ◽  
pp. 255-260 ◽  
Author(s):  
Jin Kai Li ◽  
Zhong Peng Liu ◽  
Jiang Fan Luo ◽  
Xin Bo Ma ◽  
Xin Teng ◽  
...  
Keyword(s):  
Blue Emission ◽  
Yellow Emission ◽  
Excitation Wavelength ◽  
Homogeneous Precipitation ◽  
Fluorescent Properties ◽  
Spherical Morphology ◽  
Rare Earth Nitrate ◽  
Urea Content ◽  
Phase Pure ◽  
Optimal Excitation

The oxide phosphor (Y1-xDyx)2O3(x=0-0.1) was obtained by calcining their respective precursors synthesized by homogeneous precipitation technique using rare earth nitrate as mother salt and urea as precipitating agent. The particle shape/size, fluorescent properties (especially the influence of Dy3+ concentration and calcination temperature) of the product was studied in detail. The results showed that the precursors exhibit monodisperse spherical morphology whose size can be controlled by adjusting the urea content. The phase pure (Y1-xDyx)2O3 can be obtained by calcining precursor at least 600 °C, and the monodisperse spherical morphology can be kept at even high temperature of 1000 °C. The (Y1-xDyx)2O3 phosphors exhibit strong yellow emission at ~577 nm (4F9/2→6H13/2 transition of Dy3+) and blue emission at ~491 nm (4F9/2→6H15/2 transition of Dy3+) upon optimal excitation wavelength of ~352 nm. The quenching concentration of Dy3+ was determined to be ~2 at% (x=0.02). The emission intensity of (Y1-xDyx)2O3 phosphors can be improved with the temperature and particle size increasing

scholarly journals Experimental analysis on the optimal excitation wavelength for fine-grained identification of refined oil pollutants on water surface based on laser-induced fluorescence

2021 ◽  
Author(s):  
Ming Xie ◽  
Yunpeng Jia ◽  
Ying Li ◽  
Xiaohua Cai ◽  
Kai Cao
Keyword(s):  
Oil Spill ◽  
Theoretical Basis ◽  
Water Surface ◽  
Laser Induced Fluorescence ◽  
Excitation Wavelength ◽  
Refined Oil ◽  
Fine Grained ◽  
Optimal Excitation ◽  
Oil Spill Identification

Abstract Laser-induced fluorescence (LIF) is an effective, all-weather oil spill identification method that has been widely applied for oil spill monitoring. However, the distinguishability on oil types is seldom considered while selecting excitation wavelength. This study is intended to find the optimal excitation wavelength for fine-grained classification of refined oil pollutants using LIF by comparing the distinguishability of fluorometric spectra under various excitation wavelengths on some typical types of refined-oil samples. The results show that the fluorometric spectra of oil samples significantly vary under different excitation wavelengths, and the four types of oil applied in this study are most likely to be distinguished under the excitation wavelengths of 395 nm and 420 nm. This study is expected to improve the ability of oil types identification using LIF method without increasing time or other cost, and also provides theoretical basis for the development of portable LIF devices for oil spill identification.

ChemInform Abstract: Sr2ZnS3: Crystal Structure and Fluorescent Properties of a New Eu(II)-Activated Yellow Emission Phosphor.

ChemInform ◽  
2010 ◽  
Vol 42 (2) ◽  
pp. no-no
Author(s):  
V. Petrykin ◽  
M. Okube ◽  
H. Yamane ◽  
S. Sasaki ◽  
M. Kakihana
Keyword(s):  
Crystal Structure ◽  
Yellow Emission ◽  
Fluorescent Properties

Synthesis and Compositional Control of Size Monodisperse SixGe1-x Nanocrystals for Optoelectronic Applications

2013 ◽  
Vol 1551 ◽  
pp. 11-16
Author(s):  
Keith Linehan ◽  
Darragh Carolan ◽  
Daithi Ó Sé ◽  
Hugh Doyle
Keyword(s):  
Silicon Germanium ◽  
Quantum Confinement ◽  
Room Temperature ◽  
Blue Emission ◽  
Excitation Wavelength ◽  
Microscopy Imaging ◽  
Quantum Confinement Effects ◽  
Transmission Electron ◽  
Co Reduction ◽  
Compositional Control

ABSTRACTAlkyl-terminated SixG1-x nanocrystals are prepared at room temperature by co-reduction of Si and Ge precursors by hydride reducing agents within inverse micelles. Compositional control of the alloy silicon-germanium NCs (ca. 3.6 nm) is achieved by varying the relative amounts of each precursor used in the synthesis. Transmission electron microscopy imaging confirmed that the NCs are highly crystalline with a narrow size distribution; optical spectroscopy shows strong quantum confinement effects, with moderate absorption in the UV spectral range, and a strong blue emission with a marked dependency on excitation wavelength.

Combustion Synthesis and Luminescent Properties of Eu3+ and Dy3+ Co-Doped Amorphous SrAl2O4

2013 ◽  
Vol 538 ◽  
pp. 58-62 ◽  
Author(s):  
Bao Gai Zhai ◽  
Qing Lan Ma ◽  
Yuan Ming Huang
Keyword(s):  
Blue Emission ◽  
Luminescent Properties ◽  
Yellow Emission ◽  
Photoluminescence Spectra ◽  
Solution Combustion ◽  
X Ray ◽  
Emission Color ◽  
Blue Background ◽  
Good Environment ◽  
Co Doped

Trivalent Eu and Dy ions co-doped amorphous strontium aluminate oxide (SrAl2O4:Eu3+Dy3+) were synthesized through solution combustion route. The phase of the synthesized compound was examined with the X-ray diffractometry. The photoluminescence spectra of the amorphous SrAl2O4:Eu3+Dy3+ has shown that the sharp blue emission of Dy3+ at 483 nm, the sharp yellow emission of Dy3+ at 570 nm and the sharp red emission of Eu3+ at 615 nm can be integrated into the broad blue background emission of the amorphous host. The results indicate that the amorphous SrAl2O4 host can provide good environment to tune the emission color for the SrAl2O4:Eu3+Dy3+.

Ratiometric fluorescence imaging of endogenous selenocysteine in cancer cell matrix

2017 ◽  
Vol 5 (33) ◽  
pp. 6890-6896 ◽  
Author(s):  
Yong Tian ◽  
Fangyun Xin ◽  
Congcong Gao ◽  
Jing Jing ◽  
Xiaoling Zhang
Keyword(s):  
Fluorescence Imaging ◽  
Cancer Cell ◽  
Blue Emission ◽  
Yellow Emission ◽  
Fluorescence Ratio ◽  
Ratiometric Fluorescence ◽  
Specific Reaction ◽  
Quantitative Correlation ◽  
Cell Matrix ◽  
A Cell

A ratiometric method for tracing the variation of selenocysteine (Sec) in a cell matrix was provided. This was constructed by the quantitative correlation between the fluorescence ratio ofRat-Sec(blue emission, the probe) andNap-OH(green-yellow emission, the product from a Sec-specific reaction) and the concentration of Sec.

scholarly journals Synthesis of Dy3+, Eu3+ and Tb3+ Activated Y2O2S Optoelectronic Phosphors for N-UV LED Applications

2020 ◽  
Vol 9 (4) ◽  
pp. 2068-2074
Keyword(s):  
Solid State Reaction Method ◽  
Yellow Emission ◽  
Strong Line ◽  
Excitation Wavelength ◽  
Excitation Spectra ◽  
Near Ultraviolet ◽  
Red Color ◽  
Blue Radiation ◽  
Bright Color ◽  
Color Emission

In this, a series of iso-structural Y2O2S (RE3+ = Dy3+ , Eu3+ and Tb3+) phosphors were synthesized by high temperature solid state reaction method. All the phosphors exhibit strong line and broad excitation in the near ultraviolet (n-UV) region. Bright color emission in blue, green and red color region of electromagnetic hue cycle was noticed. The concentration of activator doped was optimized from the photoluminescence (PL) study. The quenching in luminescence intensity after particular concentration of dopant is discussed here. Y2O2S phosphor doped with Dy3+displays useful blue and yellow emission bands at 487nm and 574nm, when stimulated by 388nm excitation wavelength. Y2O2S:Eu3+ phosphor displays an orange and red emission at 594nm and 620nm, when stimulated at 396 nm. Whereas, Y2O2S:Tb3+ phosphor displays weak blue radiation in the range 485nm and strong green radiation at 545nm, when stimulated at 305 nm. The excitation spectra used for the Y2O2S:RE3+ (RE3+ = Dy3+ , Eu3+ and Tb3+) phosphor is in the near ultraviolet (n-UV) region spanning from 300 nm to 400 nm, which is a peculiarity of near ultraviolet stimulated LED. The outcome of the RE3+ (RE3+= Dy3+ , Eu3+and Tb3+) absorption on the luminescence properties of Y2O2S:RE3+ phosphors was also studied.

scholarly journals Indium-antimony-halide single crystals for high-efficiency white-light emission and anti-counterfeiting

2021 ◽  
Vol 7 (34) ◽  
pp. eabg3989
Author(s):  
Jun-Hua Wei ◽  
Jin-Feng Liao ◽  
Lei Zhou ◽  
Jian-Bin Luo ◽  
Xu-Dong Wang ◽  
...  
Keyword(s):  
Single Crystals ◽  
White Light ◽  
High Performance ◽  
High Efficiency ◽  
Light Emission ◽  
Blue Emission ◽  
White Light Emission ◽  
Information Storage ◽  
Yellow Emission ◽  
Bright White Light

Although single-source white emissive perovskite has emerged as a class of encouraging light-emitting material, the synthesis of lead-free halide perovskite materials with high luminous efficiency is still challenging. Here, we report a series of zero-dimensional indium-antimony (In/Sb) alloyed halide single crystals, BAPPIn2–2xSb2xCl10 (BAPP = C10H28N4, x = 0 to 1), with tunable emission. In BAPPIn1.996Sb0.004Cl10, bright yellow emission with near 100% photoluminescence quantum yield (PLQY) is yielded when it was excited at 320 nm, which turns into bright white-light emission with a PLQY of 44.0% when excited at 365 nm. Combined spectroscopy and theoretical studies reveal that the BAPP4+-associated blue emission and inorganic polyhedron–afforded orange emission function as a perfect pair of complementary colors affording white light in BAPPIn1.996Sb0.004Cl10. Moreover, the interesting afterglow behavior, together with excitation-dependent emission property, makes BAPPIn2–2xSb2xCl10 as high-performance anti-counterfeiting/information storage materials.

Realization of Excitation Wavelength Independent Blue Emission of ZnO Quantum Dots with Intrinsic Defects

ACS Photonics ◽  
2020 ◽  
Vol 7 (3) ◽  
pp. 723-734
Author(s):  
Hong Hee Kim ◽  
Yeonju Lee ◽  
Yun Jae Lee ◽  
Junkyeong Jeong ◽  
Yeonjin Yi ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Blue Emission ◽  
Excitation Wavelength ◽  
Intrinsic Defects ◽  
Zno Quantum Dots

A New Salt-Inclusion Single-Phased White Phosphor Ba7B3SiO13Br:Dy3+ for White Light-Emitting Diodes

2019 ◽  
Vol 803 ◽  
pp. 93-97
Author(s):  
Hai Dong Ju ◽  
Bao Ling Wang ◽  
Qi Mei Yang
Keyword(s):  
White Light ◽  
Emission Band ◽  
Light Emitting Diodes ◽  
Hexagonal Phase ◽  
Blue Emission ◽  
Yellow Emission ◽  
Conventional Solid State Reaction ◽  
Blue Emission Band ◽  
Light Emitting ◽  
White Light Emitting Diodes

A series of Ba7B3SiO13Br:Dy3+ phosphors were synthesized by a conventional solid-state reaction method for the first time. The X-ray diffraction patterns confirmed that the samples were pure phase and crystallized in a hexagonal phase with a space group of the P63mc (186). The luminescence spectrum exhibited a strong blue emission band peaked at 478 nm, a strong yellow emission band at 575 nm and a weak emission band at 665 nm, corresponding to the transitions from 4F9/2 to 6H15/2, 6H13/2 and 6H13/2 of Dy3+, respectively. According to the emission spectrum of Ba6.92B3SiO13Br:0.08Dy3+ excited at 349 nm, the chromaticity coordinate was calculated to be (0.317, 0.358) located on the white light region. The concentration quenching mechanism of Dy3+ in Ba7B3SiO13Br was ascribed to the multipolar-multipolar interaction. The current researches suggested that the phosphor can be used as a white phosphor suitable for white light-emitting diodes.

scholarly journals Phase transformation and enhanced blue photoluminescence of zirconium oxide poly-crystalline thin film induced by Ni ion beam irradiation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Vishnu Chauhan ◽  
Deepika Gupta ◽  
Nikhil Koratkar ◽  
Rajesh Kumar
Keyword(s):  
Thin Films ◽  
Phase Transformation ◽  
Zirconium Oxide ◽  
Ion Beam ◽  
Blue Emission ◽  
Clean Energy ◽  
Visible Range ◽  
Excitation Wavelength ◽  
Potential Candidate ◽  
Nanocrystalline Thin Films

AbstractSwift heavy ions (SHI) irradiation of Nickel (Ni) beam with different ions fluence bring the modifications in the functional properties of radio frequency (RF) grown zirconium oxide (ZrO2) nanocrystalline thin films. X-ray diffraction analysis affirms the monoclinic to tetragonal phase transformation and diminishing of peak at higher fluence 1 × 1014 and 2 × 1014 ions/cm2 induced by electronic excitation caused by SHI. Zirconium oxide thin films exhibit the same thickness (195 nm) of virgin and irradiated samples and whereas the nanocrystalline thin films have the elemental composition in proper stoichiometry (1:2) as analyzed by rutherford backscattering spectroscopy (RBS). Photoluminescence measurements confirm the blue emission of virgin and irradiated sample recorded at excitation wavelength 270 to 310 nm. The intensity of obtained emission bands varies with fluence which is interpreted in terms of generation and annihilation of defect centers. The characteristic Ag and Bg Raman modes of monoclinic and tetragonal ZrO2 are obtained at different positions. Moreover, the nanocrystalline ZrO2 thin films exhibits the most prominent absorption phenomenon in the visible range and the irradiation cause significant decrease in band gap to 3.69 eV compare to the virgin ZrO2 sample (3.86 eV). XPS analysis indicates the shifting of the core levels Zr 3d and O 1s towards higher binding energy and spin—orbit splitting of different states. The findings in this research justify that the irradiated thin films can be a potential candidate for designing of new materials, intense radiation environments, nuclear reactors, nuclear waste systems, clean energy sources.

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