Luminescence Properties and Energy Transfer of Sm3+-Eu3+ Co-Doped Gd2(MoO4)3 Red Phosphors

2012 ◽  
Vol 591-593 ◽  
pp. 931-934 ◽  
Author(s):  
Xiu Juan Geng ◽  
Yong Jie Chen ◽  
Yan Wen Tian ◽  
Lin Jiu Xiao
Keyword(s):  
Particle Size ◽  
Energy Transfer ◽  
Sol Gel ◽  
Luminescence Properties ◽  
Good Prospect ◽  
Efficient Energy Transfer ◽  
Co Doping ◽  
Red Phosphors ◽  
Chromaticity Coordinates ◽  
Standard Values

The red phosphor Gd2(MoO4)3:Eu3+,Sm3+ was prepared by sol-gel method. The morphology and luminescence characteristics of the phosphor particles were characterized by scanning electron microscopy (SEM) and fluorophotometer. The results showed that the phosphor had the advantages of small particle size and the uniform particle size distribution. The luminescence properties of Eu3+ ions in Gd1.37Eu0.6Sm0.03(MoO4)3 could be evidently improved by co-doping of Sm3+ ions, which was due to the efficient energy transfer process from Sm3+ to Eu3+ ions. The chromaticity coordinates for Eu3+ doped Gd1.4Eu0.6(MoO4)3 and Eu3+ and Sm3+ codoped Gd1.37Eu0.6Sm0.03(MoO4)3, are(0.662, 0.329) and (0.668, 0.331), respectively. Because of the introduction of Sm3+ into the red-emitting phosphors, the chromaticity coordinates of Gd1.37Eu0.6Sm0.03(MoO4)3 phosphor is closer to the standard values of International chromaticity coordinates(0.67, 0.33). So Gd1.37Eu0.6Sm0.03(MoO4)3 shows good prospect for red phosphors of white LED.

Research on Particle Size and Luminescence Properties of GdBaB9O16: Eu3+Phosphor Prepared by Sol-Gel Method

2012 ◽  
Vol 602-604 ◽  
pp. 839-842
Author(s):  
Ying Xie ◽  
Lin Jiu Xiao ◽  
Yong Jie Chen ◽  
Wen Ze Li ◽  
Xiu Juan Geng
Keyword(s):  
Particle Size ◽  
Particle Distribution ◽  
Sol Gel ◽  
Emission Peak ◽  
Luminescence Properties ◽  
Polyethylene Glycols ◽  
Excitation Peak ◽  
Red Phosphors ◽  
Gel Technique ◽  
The Relationship

Gd0.6BaB9O16: Eu3+0.4 red phosphors were prepared by sol-gel technique. The different polyethylene glycols (PEGs) were added to control the particle size ofGd0.6BaB9O16: Eu3+0.4. The particle distribution and the relationship between the particle size and the luminescence properties of the phosphors were investigated. PEGs have no influence on the structure ofGd0.6BaB9O16: Eu3+0.4, but the particle size is changed with different molecular weight of PEGs. And the relative intensity of excitation peak and emission peak ofGd0.6BaB9O16: Eu3+0.4phosphor are reduced by adding PEG, due to the particle size effects.

scholarly journals Warm-white luminescence of Dy3+ and Sm3+ co-doped NaSrPO4 phosphors through energy transfer between Dy3+ and Sm3+ ions

2021 ◽  
Author(s):  
Wen Yan ◽  
Junhan Li ◽  
Wentao Zhang ◽  
Xi Gao ◽  
Peicong Zhang
Keyword(s):  
Energy Transfer ◽  
White Light ◽  
Sol Gel ◽  
Synthesis Temperature ◽  
Dipole Transition ◽  
Efficient Energy Transfer ◽  
Light Emitting ◽  
Co Doping ◽  
Warm White Light ◽  
Co Doped

Abstract Series of white-light-emitting NaSrPO4:Dy3+ phosphors were synthesized via a sol-gel method. Small amounts of Sm3+ ions were co-doped into the phosphors to enhance their luminescence. The effects of Dy3+/Sm3+ co-doping concentrations and synthesis temperature on the phosphors’ structures and luminescence properties were investigated. The results of X-ray diffraction confirmed that the characteristic diffraction peaks of the phosphors were in accord with those of the standard NaSrPO4 structure. Energy dispersive spectroscopy indicated that the NaSrPO4:Dy3+ samples were prepared with stoichiometric ratios of elements. Under ultraviolet light excitation of 348 nm, the NaSrPO4:Dy3+ phosphors emitted a white light which was composed of two emission peaks at 484 nm (blue) and 577 nm (yellow) corresponding to the magnetic dipole transition 4F9/2 → 6H15/2 and electronic dipole transition 4F9/2 → 6H13/2 of Dy3+ ions, respectively. Based on Sm3+ co-doping, a characteristic red emission at 602 nm arose and a warm-white light containing a lower CCT value was obtained. Besides, the luminescence lifetime of Dy3+ decreased while that of Sm3+ increased as dosages of Sm3+ were added, indicating efficient energy transfer from Dy3+ to Sm3+ happened. Therefore, NaSrPO4:Dy3+, Sm3+ phosphors are promising candidates for application in warm-white light-emitting diodes.

Luminescent properties and the morphology of SrMoO4:Eu3+ powders synthesized via combining sol-gel and solid-state route

Open Physics ◽  
2010 ◽  
Vol 8 (5) ◽  
Author(s):  
Qiong Wei ◽  
Donghua Chen
Keyword(s):  
Particle Size ◽  
Solid State ◽  
Ethylenediaminetetraacetic Acid ◽  
Sol Gel ◽  
Luminescent Properties ◽  
Synthesis Temperature ◽  
X Ray Diffraction ◽  
Red Phosphors ◽  
Solid State Route ◽  
Metal Nitrates

AbstractSrMoO4:Eu3+ red phosphors were prepared by combining sol-gel and solid-state route. Citric acid and ethylenediaminetetraacetic acid (EDTA), employed as the chelating agents, were added to the aqueous solutions of metal nitrates. X-ray diffraction (XRD) and photoluminescent spectra techniques (PL) were used to characterize the resultant powders. The results indicated the obtained SrMoO4:Eu3+ phosphors were fine powders with a particle size of 50 nm. The effects of synthesizing conditions were also investigated and optimized, which included the synthesis temperature and the activator concentration on the luminescent intensity. Compared with SrMoO4:Eu3+ phosphors prepared by Solid-state reaction SrMoO4:Eu3+ phosphors prepared by combining sol-gel and solid-state route showed appropriate particle size and a higher emission intensity.

Co-doping effect of CaS and Nd2S3 nanocrystallites on luminescence properties of sol–gel SiO2 xerogel

2005 ◽  
Vol 91 (2-3) ◽  
pp. 253-256
Author(s):  
Ping Yang ◽  
Meng Kai Lü ◽  
Chun Feng Song ◽  
Dong Xu ◽  
Duo Long Yuan ◽  
...  
Keyword(s):  
Sol Gel ◽  
Doping Effect ◽  
Luminescence Properties ◽  
Co Doping

Luminescence Properties of Ytterbium Activated PLZT Ceramics

2016 ◽  
Vol 98 ◽  
pp. 64-69
Author(s):  
Malgorzata Plonska ◽  
Wojciech A. Pisarski ◽  
Joanna Pisarska
Keyword(s):  
Near Infrared ◽  
Sol Gel ◽  
Ceramic Matrix ◽  
Luminescence Decay ◽  
Luminescence Properties ◽  
Luminescence Spectra ◽  
Activator Concentration ◽  
Ceramic Powders ◽  
Co Doping ◽  
Infrared Luminescence

In the present work the influence of co-doping with ytterbium ions (for 0, 0.5, 1.5, 2.5 wt.% of Yb3+) on physical properties of 8/65/35 PLZT was studied. The ceramic powders were synthesized by the modified sol-gel method, and underwent consolidation by the pressure-less sintering techniques, in Ts=1200°C/6h. Our investigations give a detailed account of the relationships between concentrations of trivalent ytterbium ions in PLZT matrix, on their structure, microstructure, as well as luminescence properties. Near-infrared luminescence spectra at about 1020 nm were registered, which correspond to 2F5/2 - 2F7/2 transition of Yb3+. Based on decay measurements, the luminescence lifetimes for the 2F5/2 excited state of Yb3+ were determined. Luminescence decay analysis indicates that the 2F5/2 lifetime increase with increasing activator concentration (Yb3+) in PLZT ceramic matrix.

scholarly journals Luminescence properties of yttrium gadolinium orthovanadate nanophosphors and efficient energy transfer from VO43− to Sm3+ via Gd3+ ions

2020 ◽  
Vol 13 (1) ◽  
pp. 474-480 ◽  
Author(s):  
Vishnu V. Jaiswal ◽  
Swati Bishnoi ◽  
G. Swati ◽  
Paramjeet Singh ◽  
Naina Lohia ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Luminescence Properties ◽  
Efficient Energy Transfer ◽  
Efficient Energy

Synthesis and Luminescence Properties of Red Phosphors: Mn2+ Doped MgSiO3 and Mg2SiO4 Prepared by Sol-Gel Method

2006 ◽  
Vol 24 (1) ◽  
pp. 104-107 ◽  
Author(s):  
Lin Lin ◽  
Yin Min ◽  
Shi Chaoshu ◽  
Zhang Weiping ◽  
You Baogui
Keyword(s):  
Sol Gel ◽  
Luminescence Properties ◽  
Gel Method ◽  
Sol Gel Method ◽  
Red Phosphors

Combustion Synthesis of CaMoO4:Eu3+, Li+ Red Phosphors Using Urea-Thiourea Mixture Fuels

2013 ◽  
Vol 652-654 ◽  
pp. 546-549
Author(s):  
Xia Wang ◽  
Yu Zhi Feng ◽  
Gui Hua Peng ◽  
Zhen Hua Liang ◽  
Xiao Bao Han
Keyword(s):  
Combustion Synthesis ◽  
Crystalline Phase ◽  
Tetragonal Phase ◽  
Luminescent Properties ◽  
Luminescent Intensity ◽  
Red Emission ◽  
Red Phosphors ◽  
Chromaticity Coordinates ◽  
Standard Values ◽  
Diffraction Peaks

The CaMoO4:Eu3+, Li+ red phosphors were synthesized by combustion synthesis with urea or urea-thiourea as fuels, and their crystalline phase, morphology and luminescent properties were investigated. The XRD results demonstrated that all the diffraction peaks of the products can be well indexed to the pure tetragonal phase of CaMoO4. The SEM photographs showed that the particles of sample using urea as fuel are agglomeration, while the particles of sample using urea-thiourea mixture fuels are non-agglomeration. The powder can be effectively excited by ultraviolet with wavelength of 395 nm, and exhibits a strong red emission with maximum wavelength at 615 nm. The luminescent intensity of the phosphor with mixture fuels had 2.2 times stronger than that of the phosphor with single fuel, and its chromaticity coordinates (0.65, 0.35) was closer to NTSC standard values (0.67, 0.33).

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