Enhancement of the red emission in Ba3(PO4)2:Eu3+ by addition of charge compensator Na+

2018 ◽  
Vol 32 (34n36) ◽  
pp. 1840063 ◽  
Author(s):  
Dandan Zhang ◽  
Huaxing Xiao ◽  
Wei Jiang ◽  
Xia Cao ◽  
Lu Huang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Red Light ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Host Crystal ◽  
Red Emission ◽  
Uv Led ◽  
Charge Compensator ◽  
Red Emitting Phosphor

Ba[Formula: see text](PO4)2:0.04Eu[Formula: see text] (S1) and Ba[Formula: see text]Na[Formula: see text](PO4)2:0.04Eu[Formula: see text] (S2) were prepared by solid state reaction. The phases and luminescent properties of the obtained phosphors were characterized. The results demonstrate that the phosphors particles emit an intensive red light under excitation at 395 nm. Both phosphors can be efficiently excited by ultraviolet and blue light, and the emission spectra mainly consist of two emission peaks at 591 nm and 611 nm. The crystallographic sites of Eu[Formula: see text] ions in Ba3(PO4)2 host were discussed on the base of emission spectra and its host crystal structure. By introducing the charge compensator Na[Formula: see text] into the S1 phosphor, its emission intensity was enhanced, indicating that S2 could serve as a promising red-emitting phosphor for UV LED applications.

scholarly journals Tunable Yellow-Red Emission via Energy Transfer in Dy3+, Mn4+: NaLaMgWO6 Phosphors for UV-Excited LED

2021 ◽  
Author(s):  
yonghua wu ◽  
Fugui Yang ◽  
Fengpo Yan ◽  
Ruijuan Zuo
Keyword(s):  
Energy Transfer ◽  
Solid State ◽  
Solid State Reaction ◽  
Red Light ◽  
Emission Spectra ◽  
Excitation Source ◽  
Red Emission ◽  
Phase Purity ◽  
Emission Performance ◽  
Light Excitation

Abstract The Dy3+, Mn4+: NaLaMgWO6 phosphors are synthesized successfully using the technique of solid-state reaction at 1150 ℃. The XRD and SEM-EDS are measured to analyze the phase purity. The concentrations of Dy3+, Mn4+, Mg2+, Na+, La3+ and W6+ are measured by ICP. The absorption and excited spectra are presented, which indicate the 390 nm is suitable for the tunable yellow-red light excitation. Using the 390 nm LED as the excitation source, the emission spectra with different doped concentrations ratios of Dy3+to Mn4+ are obtained, which shows good tunable yellow-red emission performance.

Luminescent Properties of a Novel Red-Emitting Phosphor Ca1.95P2O7:0.05Eu3+, B3+, M+ (M=Li, Na, K) for White Light-Emitting Diodes

2013 ◽  
Vol 634-638 ◽  
pp. 2481-2484 ◽  
Author(s):  
Mi Fang Yan ◽  
Li Hong Xue ◽  
You Wei Yan
Keyword(s):  
Boric Acid ◽  
Synthesis Method ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Emission Peak ◽  
Molar Ratio ◽  
Light Emitting ◽  
Charge Compensator ◽  
White Light Emitting Diodes ◽  
Red Emitting Phosphor

A series of Ca1.95P2O7:0.05Eu3+, B3+, M+ (M=Li, Na, K) phosphors were prepared by combustion synthesis method using boric acid as flux and M+ as charge compensator. The crystal structure and luminescent properties were investigated. The emission spectra show that the most intensive emission peak is located at 612nm, corresponding to the 5D0-7F2 transition of Eu3+. The phosphors can be efficiently excited by 394nm and 464nm light, which are matched well with the emission wavelength of near UV and blue light-emitting chips, respectively. The results show that boric acid is effective in improving the luminescence intensity, and the optimum molar ratio of boric acid to the pyrophosphate is 0.09. The relative emission intensities of Eu3+ (5D0-7F2) in Ca2P2O7:Eu3+ phosphors with M+ (M=Li, Na, K) introduced as charge compensator are significantly enhanced, and the phosphor added with Na+ show the strongest emission.

Comparison of Luminescent Properties in Solid-State and Polymer Films of Eu(III) Complexes Containing 2-Acylindandione Ligands

2018 ◽  
Vol 762 ◽  
pp. 239-243
Author(s):  
Ilze Malina ◽  
Valdis Kampars
Keyword(s):  
Solid State ◽  
Polymer Films ◽  
Red Light ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Ternary Complexes ◽  
Quantum Yields ◽  
Excitation Spectra ◽  
Ion Emission ◽  
Narrow Bands

The Europium(III) ternary complexes Eu(BID)3(PHEN) and Eu(MBID)3(PHEN) (BID – 2-benzoyl-1,3-indandione, MBID - 2-(4-methylbenzoyl)-1,3-indandione and PHEN – 1,10-Phenantroline) were synthesized, characterized and incorporated into poly methyl methacrylate (PMMA) and poly-N-vinylcarbazole (PVK) matrixes. Emission properties in solid-state and polymer films were investigated through excitation spectra, emission spectra and absolute photoluminescence quantum yields (PLQY). Both complexes in their solid-state and films exhibited red-light luminescence with narrow bands corresponding to Eu(III) ion emission. In solid-state complexes were characterized with PLQY of 6% and 10%, in PVK matrixes quantum yield dropped down to 4%, however, in PMMA films exhibited similar luminescence PLQY than in solid-state.

Photo and Electroluminescent Properties of a Porphyrin-Poly(p-Phenylene Vinylene) Derivative

1999 ◽  
Vol 598 ◽  
Author(s):  
J. Morgado ◽  
R. Iqbal ◽  
G. Yahioglu ◽  
L. R. Milgrom ◽  
S. C. Moratti ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Solid State ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Phenylene Vinylene ◽  
Efficient Energy Transfer ◽  
Light Emitting ◽  
Efficient Energy ◽  
Small Absorption ◽  
Pl Emission

ABSTRACTThe solid state luminescent properties of new statistical copolymers of 2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene vinylene and a porphyrin-substituted phenylene vinylene are reported. The photoluminescence, PL, emission shows an efficient energy transfer to the porphyrin, in spite of the small absorption coefficient of the porphyrin in the wavelength range of the poly [2-methoxy-5-(2'- ethylhexyloxy)-1,4-phenylene vinylene], MEH-PPV, emission. At a porphyrin content of 0.25%, by weight, the emission is already dominated by the porphyrin. The PL efficiency of these copolymers is significantly reduced from the value of 13% for MEH-PPV down to 3% for the copolymer with 10.84% of porphyrin. Efficient energy transfer is also observed in the emission spectra of light-emitting diodes.

Preparation and Luminescent Properties of Zn2SiO4:Mn2+

2008 ◽  
Vol 368-372 ◽  
pp. 375-377 ◽  
Author(s):  
Li Mei Cao ◽  
Wen Bo Bu ◽  
Chuan Ai Ren ◽  
Xiao Xu ◽  
Qiang Li
Keyword(s):  
Solid State ◽  
Active Carbon ◽  
Solid State Reaction ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Zinc Nitrate ◽  
Manganese Nitrate ◽  
Reducing Atmosphere ◽  
Pure Sio2

Zn2SiO4:Mn2+ was synthesized via a dipping method. Stoichiometric high pure SiO2 was put into the solution of zinc nitrate and manganese nitrate. The mixture was milled while being heated until the water was vaporized completely. The as-received mixture was added into the ethanol, and dispersed well, then the mixture was milled and heated to remove the ethanol thoroughly by evaporation. The precursor were dried for several hours at 60°C, and annealed in a reducing atmosphere of active carbon at 1000°C for 4 h. As-prepared powders of Zn2SiO4:Mn2+ was tested by XRD and SEM. Its luminescent properties were characterized by excitation and emission spectra. The results are compared with those of Zn2SiO4:Mn2+ prepared by a general solid state reaction.

Luminescent properties and application of Eu3+-activated Gd2(MoO4)3 red-emitting phosphor with pseudo-pompon shape for solid-state lighting

2010 ◽  
Vol 28 (6) ◽  
pp. 878-882 ◽  
Author(s):  
Xianghong HE ◽  
Mingyun GUAN ◽  
Zhongchun LI ◽  
Tongming SHANG ◽  
Ning LIAN ◽  
...  
Keyword(s):  
Solid State ◽  
Luminescent Properties ◽  
Solid State Lighting ◽  
Red Emitting Phosphor

The Influence of Processing Parameters on Photoluminescent Properties of Ba2ZnS3:Mn Phosphors by Double-Crucible Method

2004 ◽  
Vol 817 ◽  
Author(s):  
Yu-Feng Lin ◽  
Yen-Hwei Chang ◽  
Bin-Siang Tsai
Keyword(s):  
Doping Concentration ◽  
Raw Materials ◽  
Red Light ◽  
Emission Spectra ◽  
Processing Parameters ◽  
Excitation Wavelength ◽  
Orthorhombic Crystal ◽  
Orthorhombic Crystal Structure ◽  
Red Emission ◽  
Double Crucible

AbstractRed light emitting of Mn2+ doped Ba2ZnS3 phosphor powders have been synthesized by double-crucible method at different thermal treatments. XRD results indicate that the raw materials are completely sulfurized above 950°C, and the Ba2ZnS3: Mn2+ powders don't change its orthorhombic crystal structure with increasing doping concentration from 0 to 0.8 mol%. The photoluminescence of Ba2ZnS3: Mn2+ powders fulfilled the most efficient emission at the excitation wavelength λex=358 nm and showed the red emission light with peak wavelength λem=627nm at the doping concentration of Mn2+ ion between 0.2 and 0.8 mol%. The high-luminance red emission results from the 4T1 (4G)—6A1 (6S) transition in the Mn2+ ion. Ba2ZnS3: Mn2+ phosphors synthesized by double-crucible method have broad emission spectra (550nm∼750nm) with FWHM (full width at half maximum broadband) about 66nm. In our research, the Ba2ZnS3 doped with 0.4 mol% Mn2+ has the highest luminescent intensity as thermal treatment at 950°C for 16 hours and the CIE coordinate is x=0.66, y=0.33.

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