scholarly journals Luminescence performance of laser synthesized Al2O3:Eu3+ nanophosphors depending on synthesis conditions

2021 ◽  
Vol 2067 (1) ◽  
pp. 012008
Author(s):  
A Kostyukov ◽  
A Nashivochnikov ◽  
M Rakhmanova ◽  
V Snytnikov
Keyword(s):  
Crystallite Size ◽  
Electric Dipole ◽  
Electric Dipole Transition ◽  
Dipole Transition ◽  
Luminescence Properties ◽  
Laser Vaporization ◽  
Red Emission ◽  
Synthesis Conditions ◽  
Chromaticity Coordinates ◽  
Luminescence Performance

Abstract Al2O3:Eu3+ nanophosphors were prepared by laser vaporization method in a flowing mixture of Ar/He and O2. Luminescence properties of Al2O3:Eu3+ nanophosphors are predominantly determined by Eu3+ ions red emission with inhomogeneously broadened bands in the region of 550-750 nm corresponding to 5D0 →7FJ transitions of Eu3+ (J = 0 - 4). Hypersensitive electric dipole transition 5D0 →7F2 dominates in the spectrum and is responsible for the red emission. The effect of crystallite size on luminescence properties of Al2O3:Eu3+ nanocrystals was observed. It was shown that the introduction of oxygen during the synthesis improves the luminescence performance. The obtained chromaticity coordinates and high absolute QY (~ 14%) indicate the possibility of using red nanophosphors based on Al2O3:Eu3+.

A New Red Emitting Phosphor Mg2SnO4: Eu

2010 ◽  
Vol 33 ◽  
pp. 313-316
Author(s):  
Xiao Jun Wang ◽  
Xiao Chun Zhou
Keyword(s):  
Solid State ◽  
Low Temperature ◽  
Tin Oxide ◽  
Electric Dipole ◽  
Solid State Reaction ◽  
Electric Dipole Transition ◽  
Dipole Transition ◽  
Red Emission ◽  
Emission Transition ◽  
Red Emitting Phosphor

Mg2SnO4 was adopted as the host material of a new red emitting phosphor. Lumin-escence properties of the europium-doped magnesium tin oxide prepared by the low temperature solid state reaction were investigated under 395nm excitation. Under 395 nm excitation, the Mg2SnO4: Eu phosphor exhibits novel red emission at about 613 nm which is assigned to the 5D0 → 7F2 electric – dipole transition. Furthermore, the emission transition 5D0 → 7F2 has been found to be more prominent over the normal orange emission transition 5D0 → 7F1.

A novel energy transfer inducing strong enhancement of electric dipole transition in Na3Mo12PO40:xEu3+ phosphors

2017 ◽  
Vol 4 (8) ◽  
pp. 086305 ◽  
Author(s):  
Jinqiao Long ◽  
Tianman Wang ◽  
Zhirong Luo ◽  
Yong Gao ◽  
Baoling Song ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Electric Dipole ◽  
Electric Dipole Transition ◽  
Dipole Transition ◽  
Strong Enhancement

Luminescence Properties of ZnO:Eu3+ Red Emitting Phosphor Prepared by Precipitation Method

2013 ◽  
Vol 690-693 ◽  
pp. 594-597
Author(s):  
Lin Yan Jia ◽  
Zhong Bao Shao ◽  
Jun Feng Han
Keyword(s):  
Doping Concentration ◽  
Emission Spectra ◽  
Electric Dipole Transition ◽  
Dipole Transition ◽  
Luminescence Properties ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Matrix Lattice ◽  
Red Emitting Phosphor

Zinc oxide doped with Eu3+ ions red emitting phosphors were prepared by precipitation method, and its luminescence properties were investigated. The phosphors were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) spectra. The ZnO:Eu3+ phosphors were obtained at 600°C by calcining precipitation precursor. These phosphors can be effectively excited at 465nm. In emission spectra, the strongest peak at 616nm correlating to red emission is due to the electric dipole transition 5D07F2 of Eu3+ ions. Eu3+ions replaced Zn2+ ions and occupied the non-centrosymmetric sites in the ZnO matrix lattice. The phosphor particles with narrow distribution range are approximately 100-200nm in size. The luminescence properties of ZnO:Eu3+ phosphor with 8 mol% doping concentration of Eu3+ is optimal.

An expansion method for calculating atomic properties III. The 2 S and 2 P 0 states of the lithium sequence

1963 ◽  
Vol 275 (1363) ◽  
pp. 492-503 ◽  
Keyword(s):  
Electric Dipole ◽  
Expansion Method ◽  
Electric Dipole Transition ◽  
High Accuracy ◽  
Dipole Transition ◽  
Matrix Elements ◽  
Expectation Values ◽  
Atomic Properties

An expansion method is used to calculate the expectation values of various operators for the lowest 2 S and 2 P 0 states of all members of the lithium sequence. The method is extended to the calculation of matrix elements connecting the two states and the electric dipole transition integrals are calculated. A comparison with the results of more refined calculations shows that despite its simplicity the method is capable of high accuracy.

scholarly journals Magic Wavelengths for Optical-Lattice Based Cs and Rb Active Clocks

Atoms ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 79
Author(s):  
Sukhjit Singh ◽  
Jyoti ◽  
Bindiya Arora ◽  
B. K. Sahoo ◽  
Yan-mei Yu
Keyword(s):  
Electric Dipole ◽  
Optical Lattice ◽  
Major Part ◽  
Unique Feature ◽  
Atomic Clock ◽  
Electric Dipole Transition ◽  
Dipole Transition ◽  
The Other ◽  
Dipole Polarizabilities

Active clocks could provide better stabilities during initial stages of measurements over passive clocks, in which stabilities become saturated only after long-term measurements. This unique feature of an active clock has led to search for suitable candidates to construct such clocks. The other challenging task of an atomic clock is to reduce its possible systematics. A major part of the optical lattice atomic clocks based on neutral atoms are reduced by trapping atoms at the magic wavelengths of the optical lattice lasers. Keeping this in mind, we find the magic wavelengths between all possible hyperfine levels of the transitions in Rb and Cs atoms that were earlier considered to be suitable for making optical active clocks. To validate the results, we give the static dipole polarizabilities of Rb and Cs atoms using the electric dipole transition amplitudes that are used to evaluate the dynamic dipole polarizabilities and compare them with the available literature values.

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