Synthesis and enhancement of luminescence intensity by co-doping of M+ (M=Li, Na, K) in Ce3+ doped strontium haloborate

ABSTRACTThis investigation studied the effects of Ho3+ and Er3+ on the luminescence of the blue emitting phosphor yttrium silicate, (Y1-mCem)2SiO5. Yttrium silicate has a large emission tail that extends into the red portion of the visual spectrum. To improve the chromaticity of this phosphor to give it a more saturated blue color, the emission intensity of the tail needs to be decreased. Photoluminscence and low-voltage cathodoluminescence measurements were performed on yttrium silicate phosphors with varying concentrations of Gd3+, Ho3+ and Er3+. It was found that when co-doping with Ho3+ and Er3+, the relative intensity of the emission tail was decreased, but so to was the overall luminescence intensity of this phosphor.

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Enhancing luminescence intensity and improving thermostability of red phosphors Li3Ba2La3(WO4)8:Eu3+ by co-doping with Sm3+ ions

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2021.161973 ◽

2022 ◽

Vol 891 ◽

pp. 161973

Author(s):

Shao-Jie Dai ◽

Dan Zhao ◽

Rui-Juan Zhang ◽

Lei Jia ◽

Qing-Xia Yao

Keyword(s):

Luminescence Intensity ◽

Co Doping ◽

Red Phosphors

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An Investigation of the Chromaticity of Blue Emitting Yttrium Silicate

MRS Proceedings ◽

10.1557/proc-558-15 ◽

1999 ◽

Vol 558 ◽

Cited By ~ 6

Author(s):

E. J. Bosze ◽

G. A. Hirata ◽

J. Mckittrick

Keyword(s):

Relative Intensity ◽

Luminescence Intensity ◽

Emission Intensity ◽

Low Voltage ◽

Blue Color ◽

Co Doping ◽

Yttrium Silicate ◽

Silicate Phosphors

ABSTRACTThis investigation studied the effects of Ho3+ and Er3+ on the luminescence of the blue emitting phosphor yttrium silicate, (Y1−mCem)2SiO5. Yttrium silicate has a large emission tail that extends into the red portion of the visual spectrum. To improve the chromaticity of this phosphor to give it a more saturated blue color, the emission intensity of the tail needs to be decreased. Photoluminscence and low-voltage cathodoluminescence measurements were performed on yttrium silicate phosphors with varying concentrations of Gd3+, Ho3+ and Er3+. It was found that when co-doping with Ho3+ and Er3+, the relative intensity of the emission tail was decreased, but so to was the overall luminescence intensity of this phosphor.

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Luminescent characteristics of Eu2+/Li+ doped (La-Al)2O3 phosphors and PMMA films activated with them

Revista Mexicana de Física ◽

10.31349/revmexfis.64.447 ◽

2018 ◽

Vol 64 (5) ◽

pp. 447 ◽

Cited By ~ 2

Author(s):

Roberto Vázquez Arreguín

Keyword(s):

Solid State ◽

Methyl Methacrylate ◽

Luminescence Intensity ◽

Solid State Reaction ◽

Broad Band ◽

Step Process ◽

Co Doping ◽

Broad Band Emission ◽

Band Emission ◽

Reductive Atmosphere

The effect of Li co-doping on the blue luminescence of Eu2+ doped (La-Al)2O3 phosphors and its incorporation into poly (methyl methacrylate) PMMA films are reported. The phosphors were synthesized by a simple two-step process in which the (La-Al)2O3 powders were obtained by an evaporation method, and the subsequent co-doping with Li+ and Eu2 were made through a solid state reaction in a reductive atmosphere at 1250 0C. The incorporation of those phosphors into PMMA matrix and the synthesis of films with thicknesses between 6 and 12 μm was made by drop-casting. The characteristic blue broad band emission centered at 440 nm associated with the 4f65d1→ 4F7 transition of Eu2+ ions (CIE coordinates 0.6731, 0.3343) was observed when these powders were excited with 297nm light. These luminescence intensity was enhanced when Li was incorporated as co-dopant up to 320% with respect to those phosphors without Li. The luminescent characteristics of these phosphors were preserved when they were embedded into the PMMA films.

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Enhancement of the luminescence intensity by co-doping Mn2+ into Er3+-doped SrAl2O4

Journal of Luminescence ◽

10.1016/j.jlumin.2015.02.031 ◽

2015 ◽

Vol 163 ◽

pp. 17-20 ◽

Cited By ~ 6

Author(s):

L.K.S. de Herval ◽

Y. Tuncer Arslanlar ◽

M. Ayvacikli ◽

F. Iikawa ◽

J.A. Nobrega ◽

...

Keyword(s):

Luminescence Intensity ◽

Co Doping

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Facile Combustion Synthesis of (Y,Pr)2O3 Red Phosphor: Study of Luminescence Dependence on Dopant Concentration and Enhancement by the Effect of Co-dopant

Zeitschrift für Naturforschung A ◽

10.1515/zna-2019-0346 ◽

2020 ◽

Vol 75 (4) ◽

pp. 357-371

Author(s):

K. Vini ◽

K. M. Nissamudeen

Keyword(s):

Luminescence Intensity ◽

Dopant Concentration ◽

Combustion Method ◽

X Ray Diffraction ◽

Praseodymium Oxide ◽

Co Doping ◽

Luminescence Efficiency ◽

Transmission Electron ◽

Munk Function ◽

20 Nm

AbstractThere occurs a great interest in explaining the dependence of dopant concentration on the luminescence efficiency of rare earth oxides. Unambiguously, this study explains that luminescence intensity increases with increase in dopant concentration only up to optimised value. The syntheses of doped and co-doped yttrium oxide (Y2O3) nanophosphors in this study were carried out by making use of combustion method. This method produces the nanophosphors that have sizes ranging between 5 and 20 nm as confirmed by transmission electron microscopy. X-ray diffraction pattern confirms that the incorporation of praseodymium oxide (Pr3+) and gadolinium oxide (Gd3+) does not cause any change in the cubic structure of Y2O3. The phase purity has been confirmed by Fourier transform infrared spectrum. Diffuse reflectance spectra reveal that the bandgap increases with increase in annealing temperature. Bandgap has been calculated by making use of the Kubelka–Munk function. Strongest emission was observed at 605 nm with 2 wt% of Pr3+ as optimised concentration. Replacement of Y3+ by Gd3+ partially enhances the 605-nm emission linearly. The [Y:Pr:Gd] exhibits luminescence intensity of 2.705 times more than that of Y:Pr nanophosphors. This is for the first time our team has made a detailed study regarding the effects of co-doping in the case of Y2O3:Pr powders. We have successfully presented the changes that happen to the particle after co-doping especially in the particle size and luminescence properties.

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Luminescence Study of Red Light Emitting Y2O3:Sm3+ Nanophosphors and Enhancement by Co-doping with Gadolinium oxide

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.f5363.039621 ◽

2021 ◽

Vol 9 (6) ◽

pp. 60-70

Author(s):

Vini. K ◽

Padmakumar H. ◽

K.M. Nissamudeen

Keyword(s):

Luminescence Intensity ◽

Red Light ◽

Optoelectronic Devices ◽

Combustion Method ◽

Gadolinium Oxide ◽

Maximum Intensity ◽

Samarium Oxide ◽

Light Emitting ◽

Co Doping ◽

Co Doped

This work presents the optical and structural properties of samarium oxide doped and gadolinium oxide co-doped yttrium oxide nanophosphors prepared by Combustion method. The photoluminescence emission intensity was maximum for 2wt% Sm3+ doped Y2O3 powders, that results 4G5/2 - 6H7/2 transition within Samarium, emits red light at 608 nm under the excitation of 260 nm. In the case of co-dopant, maximum intensity is obtained for 3wt% Gd3+ under the excitation of 255 nm.The Y:Sm:Gd exhibit luminescence intensity of 4.21 times more than that of Y:Sm nanophosphors. These results indicate that the prepared nanophosphors can be used in optoelectronic devices.

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