scholarly journals Investigation of Physicochemical Properties of the Structurally Modified Nanosized Silicate-Substituted Hydroxyapatite Co-Doped with Eu3+ and Sr2+ Ions

Nanomaterials ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 27
Author(s):  
Sara Targonska ◽  
Rafal J. Wiglusz
Keyword(s):  
Emission Spectra ◽  
Charge Compensation ◽  
Spectroscopic Properties ◽  
Color Temperature ◽  
Molar Ratio ◽  
Chromaticity Coordinates ◽  
Ft Ir ◽  
Cie Chromaticity ◽  
Kinetics Of ◽  
Co Doped

In this paper, a series of structurally modified silicate-substituted apatite co-doped with Sr2+ and Eu3+ ions were synthesized by a microwave-assisted hydrothermal method. The concentration of Sr2+ ions was set at 2 mol% and Eu3+ ions were established in the range of 0.5–2 mol% in a molar ratio of calcium ion amount. The XRD (X-ray powder diffraction) technique and infrared (FT-IR) spectroscopy were used to characterize the obtained materials. The Kröger–Vink notation was used to explain the possible charge compensation mechanism. Moreover, the study of the spectroscopic properties (emission, emission excitation and emission kinetics) of the obtained materials as a function of optically active ions and annealing temperature was carried out. The luminescence behavior of Eu3+ ions in the apatite matrix was verified by the Judd–Ofelt (J-O) theory and discussed in detail. The temperature-dependent emission spectra were recorded for the representative materials. Furthermore, the International Commission on Illumination (CIE) chromaticity coordinates and correlated color temperature were determined by the obtained results.

scholarly journals Photoluminescence characteristics and energy transfer phenomena in Ce3+-doped YVO4 single crystal

2021 ◽  
Vol 28 (1) ◽  
pp. 205-214
Author(s):  
Shuai Wang ◽  
Pengfei Wang ◽  
Yongfeng Ruan ◽  
Youfa Wang ◽  
Shouchao Zhang
Keyword(s):  
Energy Transfer ◽  
Single Crystals ◽  
Emission Spectra ◽  
Czochralski Method ◽  
Color Temperature ◽  
X Ray Diffraction ◽  
Excitation Spectra ◽  
Chromaticity Coordinates ◽  
Diffraction Patterns ◽  
Cie Chromaticity

Abstract The undoped YVO4 and Ce3+-doped YVO4 single crystals have been successfully grown by the Czochralski method in a medium frequency induction furnace. The X-ray diffraction patterns testified that all samples exhibited the pure tetragonal YVO4 crystalline phase without any parasitic phases. The optical properties of Ce3+-doped YVO4 single crystals with different doping concentrations were investigated via a combination of absorption, emission, and excitation spectra. Dependence of luminescence and absorption intensity on Ce3+ doping concentration was discussed at different excitation wavelengths. The typical transitions of Ce3+ ions and the unusual intrinsic luminescent phenomena of VO 4 3 − {\text{VO}}_{4}^{3-} groups were observed and investigated in Ce3+-doped YVO4 crystals. More attentions were paid to ascertaining the corresponding transition states, analyzing luminescent mechanism, and revealing the energy transfer from VO 4 3 − {\text{VO}}_{4}^{3-} to Ce3+ ions. In addition, the CIE chromaticity coordinates and correlated color temperature were calculated on a basis of emission spectra under different excitation wavelengths.

A New Deep Red-Emitting Mn2+-Activated SrLaGa3S6O Phosphor

2012 ◽  
Vol 531-532 ◽  
pp. 145-148 ◽  
Author(s):  
Rui Jin Yu ◽  
Jin Young Park ◽  
Hyun Kyoung Yang ◽  
Byung Kee Moon ◽  
Byung Chun Choi ◽  
...  
Keyword(s):  
Broad Band ◽  
Emission Spectra ◽  
Solid State Reaction Method ◽  
White Led ◽  
Photoluminescence Excitation ◽  
Led Lighting ◽  
Display Devices ◽  
Chromaticity Coordinates ◽  
Standard Values ◽  
Cie Chromaticity

A new deep red-emitting Mn2+-activated SrLaGa3S6O phosphor was first prepared by a solid-state reaction method. Their luminescence properties were investigated by photoluminescence excitation and emission spectra. The emission spectrum shows a broad band with an emission maximum at 668 nm under the host excitation of 340 nm. The full width at half maximum (FWHM) of the emission peak is about 83 nm. The CIE chromaticity coordinates (x = 0.673 and y = 0.312) shows that the phosphor emission is in the deep red region and were very near to the NTSC standard values for red. Since the excitation band of the phosphor lies in the near UV excitable region, giving a deep red emission, it can be used for applications in near UV phosphor converted white LED lighting and display devices.

Effect of P5+/Al3+ molar ratio on structure and spectroscopic properties of Nd3+/Al3+/P5+ co-doped silica glass

2016 ◽  
Vol 432 ◽  
pp. 285-291 ◽  
Author(s):  
Wenbin Xu ◽  
Meng Wang ◽  
Lei Zhang ◽  
Chongyun Shao ◽  
Danping Chen ◽  
...  
Keyword(s):  
Silica Glass ◽  
Spectroscopic Properties ◽  
Molar Ratio ◽  
Co Doped

scholarly journals Mechanism of nitrogen-fluoride co-doped TiO2/bentonite composites removing tetracycline: A study in the co-doping ratio

2020 ◽  
Vol 26 (6) ◽  
pp. 200440-0
Author(s):  
Teng WANG ◽  
Zhaofu MENG ◽  
Xinxin WANG ◽  
Amjad ALI ◽  
Xuewen CAO ◽  
...  
Keyword(s):  
Molar Ratio ◽  
Composite Surface ◽  
Oh Groups ◽  
Doped Tio2 ◽  
Co Doping ◽  
Before And After ◽  
N Doping ◽  
Ft Ir ◽  
Doping Ratio ◽  
Co Doped

N-doped and N-F co-doped TiO2/bentonite composites were synthesized via the gel-sol method. The morphology, structure and surface charge of the composite before and after adsorption were used to determine the effect N/F doping ratio on TC removal. The results showed that, compared with undoped samples, the TC adsorption on N doped composites was reduced by 24.44% on average. N-F co-doping significantly increased the TC adsorption when the Ti-N-F molar ratio was 1:1: 0.01, reaching a maximum TC adsorption of 64.00 mmol·kg<sup>-1</sup>. The coverage of the N doped TiO2 increases as the N doping ratio increases; the specific surface area increased by 2.03 % on average, but the number of surface negative charges decreased by 36.24 % on average. FT-IR results confirmed that N doping reduced the number of -OH groups on the N-doped composites. Additionally, fluorination of N-F co-doped TiO2 and bentonite surfaces inhibits hydrogen bonding and π-π interactions between the TC and the composites. As the N doping ratio increased, the coverage of N-F co-doped TiO2 on the composite surface increased, resulting in the TC adsorption decrease with the increases N doping ratio.

High color rendering index single phase white light emitting phosphors based on Tb3+/Sm3+ co-doped CePO4 nanocrystals: the role of Tb3+ as a bridge between Ce3+ and Sm3+

2019 ◽  
Vol 43 (44) ◽  
pp. 17367-17382 ◽  
Author(s):  
Sisira S. ◽  
Linju Ann Jacob ◽  
Kamal P. Mani ◽  
Biju P. R. ◽  
N. V. Unnikrishnan ◽  
...  
Keyword(s):  
White Light ◽  
Single Phase ◽  
Color Temperature ◽  
Light Emitting ◽  
Chromaticity Coordinates ◽  
Color Rendering Index ◽  
Cie Chromaticity ◽  
Color Rendering

Single phase white light emitting CePO4 nanocrystals doped with Tb3+ and Sm3+ were synthesized. The quality of white light is characterized by CIE chromaticity coordinates, color temperature, color rendering index and quantum yield.

Facile hydrothermal synthesis and pulsed laser deposition of Ca0.5Y1−x(WO4)2:xEu3+ phosphors: investigations on the luminescence, Judd–Ofelt analysis and charge compensation mechanism

2017 ◽  
Vol 41 (2) ◽  
pp. 493-502 ◽  
Author(s):  
Venkatakrishnan Mahalingam ◽  
Jagannathan Thirumalai
Keyword(s):  
Thin Film ◽  
Hydrothermal Synthesis ◽  
Pulsed Laser ◽  
Emission Spectra ◽  
Charge Compensation ◽  
Laser Deposition ◽  
Alkali Metal Ions ◽  
Compensation Mechanism ◽  
Pl Emission ◽  
Co Doped

PL emission spectra of Ca0.5Y1−x(WO4)2:xEu3+ for powder and thin film phosphors, and PL spectra of Ca0.5Y1−x(WO4)2:xEu3+ co-doped with alkali metal ions.

Correlated color temperature tunability and energy transfer phenomenon in the NaBaBO3:Dy3+/Eu3+ phosphor for white light application

2015 ◽  
Vol 08 (06) ◽  
pp. 1550077 ◽  
Author(s):  
Jianghui Zheng ◽  
Qijin Cheng ◽  
Cheng Zheng ◽  
Guo Chen ◽  
Feng Shi ◽  
...  
Keyword(s):  
Energy Transfer ◽  
White Light ◽  
Single Phase ◽  
Color Temperature ◽  
Light Emitting ◽  
Transfer Phenomenon ◽  
Near Ultraviolet ◽  
Cie Chromaticity ◽  
Co Doped ◽  
The Eu

NaBa 0.97-x BO 3 0.03 Dy 3+, x Eu 3+(0 ≤ x ≤ 0.09) single-phase white phosphors with tunable correlated color temperature (CCT) were synthesized using a conventional solid state reaction method. The phase structure and luminescence properties of the as-prepared samples were investigated. The Dy 3+, Eu 3+ doped and Dy 3+/ Eu 3+ co-doped NaBaBO 3 phosphors excited by 361 nm show two blue and yellow emissions corresponding to the 4 F 9/2 → 6 H 15/2 and 4 F 9/2 → 6 H 13/2 transitions of Dy 3+ ions and two red emissions due to the 5 D 0 → 4 F J (J = 1, 2) transitions of Eu 3+ ions. Under 361-nm light excitation, the NaBa 0.97-x BO 3 0.03 Dy 3+, x Eu 3+(0 ≤ x ≤ 0.09) phosphors feature a white light emitting property. Through the Commission Internationale de L'Eclairage (CIE) chromaticity analysis and CCT calculation, the CIE chromaticity coordinates of the emission light are all located in the white region and can be tuned from bluish white light to reddish white light when the Eu 3+ concentration increases, and the CCT values of the obtained samples can vary from 5514.31 K to 8269.42 K. Furthermore, the energy transfer phenomenon from Dy 3+ ions to Eu 3+ ions in Dy 3+/ Eu 3+ co-doped samples was also investigated. The results indicated that, through tuning the Eu 3+ concentration of the NaBaBO 3: Dy 3+/ Eu 3+ phosphors, the NaBaBO 3-based phosphor can act as a potential single-phase white emitting phosphor for the application in the near-ultraviolet (NUV) white light emitting diodes.

Investigation on Synthesis and Property of Tb3+/Dy3+ Co-Doped Gd3Al5O12 Phosphor

2017 ◽  
Vol 726 ◽  
pp. 261-265 ◽  
Author(s):  
Xin Teng ◽  
Bin Li ◽  
Jin Kai Li ◽  
Guang Bin Duan ◽  
Zong Ming Liu
Keyword(s):  
Green Emission ◽  
Color Temperature ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Efficient Energy Transfer ◽  
Green Phosphor ◽  
New Type ◽  
Ft Ir ◽  
Co Precipitation ◽  
Cie Chromaticity

The (Gd0.9-xTb0.1Dyx)3Al5O12 (x=0-0.04, GdAG:Tb3+/Dy3+) solid solution was acquired by calcining their respective precursor prepared via co-precipitation method at 1500 °C. The performance of GdAG:Tb3+/Dy3+ powders was characterized by combined technology of Fourier transform infrared absorption spectra (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM) and photoluminescence (PL) spectrum analyses. The metastable Gd3Al5O12 could be stabilized by doping smaller Tb3+ ions of 10 at.%. Under the optimal UV excitation of 275 nm, the GdAG:Tb3+/Dy3+ phosphors exhibit vivid green emission at 548 nm which were attributed to the 5D4→7F5 transition of Tb3+. The CIE chromaticity coordinate was determined at (~0.32, ~0.48) with the color temperature of ~5872 K. Compared to the Dy3+-free (Gd0.9Tb0.1)AG phosphor, the emission intensity of Dy3+-doped phosphors display stronger owing to the efficient energy transfer from Dy3+ to Tb3+. The optimal amount of Dy3+ in GdAG:Tb3+/Dy3+ phosphors was determined to be ~2.5 at.% (x=0.025). The GdAG:Tb3+/Dy3+ phosphors developed in present work are expected to be a new type of green phosphor widely used in the lighting and display areas.

scholarly journals Novel red-emitting Lu3Te2Li3O12: Eu3+ phosphor with high color purity for n-UV WLEDs

2020 ◽  
Vol 185 ◽  
pp. 04044
Author(s):  
Mingyang Qu ◽  
Xiyan Zhang ◽  
Xiaoyun Mi ◽  
Quansheng Liu ◽  
Shaoqiu Xu
Keyword(s):  
Emission Spectra ◽  
Dipole Interaction ◽  
X Ray Diffraction ◽  
Excitation Spectra ◽  
Chromaticity Coordinate ◽  
Chromaticity Coordinates ◽  
Optimal Doping Concentration ◽  
Cie Chromaticity ◽  
First Time ◽  
High Color Purity

In this work, a series of red emitting Lu3Te2Li3O12: Eu3+ phosphors were synthesized for the first time by high temperature solid state reaction. The structure was characterized by X-ray diffraction. The excitation spectra, emission spectra and CIE chromaticity coordinate were studied. The phosphors show strong red emission at 611 nm due to the 5D0-7F2 transition of Eu3+ ions. The optimal doping concentration of Eu3+ in LTL host is x = 0.5 due to the concentration quenching mechanism of dipole-dipole interaction. The CIE chromaticity coordinates of the LTL: 0.5Eu3++ phosphor is (0.644,0.355), and the purity of the color is up to 93.61%. The phosphor can be considered as a potential red-emitting candidate for near UV WLEDs.

scholarly journals Influences of copper–potassium ion exchange process on the optical bandgaps and spectroscopic properties of Cr3+/Yb3+ co-doped in lanthanum aluminosilicate glasses

RSC Advances ◽  
2021 ◽  
Vol 11 (15) ◽  
pp. 8917-8926
Author(s):  
T. H. Le ◽  
Anh-Luan Phan ◽  
Nguyen Minh Ty ◽  
Dacheng Zhou ◽  
Jianbei Qiu ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Exchange Process ◽  
Emission Spectra ◽  
Spectroscopic Properties ◽  
Potassium Ion ◽  
Visible Emission ◽  
Ion Exchange Process ◽  
Aluminosilicate Glasses ◽  
Optical Bandgaps ◽  
Co Doped

Visible emission spectra of SALBK-1Cr2.5Yb-0Cu, SALBK-1Cr2.5Yb-15Cu, SALBK-1Cr2.5Yb-20Cu, SALBK-1Cr2.5Yb-25Cu, SALBK-1Cr2.5Yb-30Cu, and SALBK-1Cr2.5Yb-35Cu glass samples under excitation 343 nm.

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