Luminescence Properties of Er3+ Ions in Bismuth Borophosphate Glasses

2016 ◽  
Vol 675-676 ◽  
pp. 351-354
Author(s):  
Natthakridta Chanthima ◽  
Jakrapong Kaewkhao
Keyword(s):  
Near Infrared ◽  
Emission Spectra ◽  
Green Emission ◽  
Concentration Quenching ◽  
Luminescence Spectra ◽  
Quenching Effect ◽  
Borophosphate Glasses ◽  
Uv Visible ◽  
Quenching Method ◽  
Concentration Quenching Effect

Er3+ ions doped bismuth borophosphate glasses are prepared in different concentration by the conventional melting-quenching method at 1200 °C. Physical properties, absorption and luminescence spectra under visible excitation are investigated. The results showed that density of glasses tended to decrease with increasing the concentration of Er2O3. While, the molar volume of glasses tended to increase with increasing the concentration of Er2O3. The optical absorption spectra were clearly observed in ultraviolet (UV), visible light (VIS) and near infrared (NIR) region. Visible emission spectra have been recorded by exciting the glass samples at 326 nm. The strongest intensity was the green emission at 521 nm. The luminescence intensity was found to increase with Er2O3 content up to 0.8 mol% and it was decreased for higher Er2O3 contents due to concentration quenching effect.

Luminescence and Optical Properties of Li2O3:Gd2O3:B2O3:Sm2O3 Glasses System

2014 ◽  
Vol 979 ◽  
pp. 479-482 ◽  
Author(s):  
Warawut Sa-Ardsin ◽  
Patarawagee Yasaka ◽  
J. Kaewkhao ◽  
K. Boonin
Keyword(s):  
Optical Properties ◽  
Absorption Spectra ◽  
Excited States ◽  
Emission Spectra ◽  
Concentration Quenching ◽  
Excitation Spectra ◽  
Quenching Effect ◽  
Air Atmosphere ◽  
Glass Matrices ◽  
Concentration Quenching Effect

The samarium-doped lithium-gadolinium borate [60Li2O:10Gd2O3:(30-x) B2O3:xSm2O3] (LGBO:Sm3+) glasses have been melted and quenched in stainless plate under an air atmosphere. Some physical and optical properties within wavelength concerned and photoluminescence of the LGBO:Sm3+glasses were measured and discussed. The density of glasses dropped until 0.10 mol% and tends to increase after that point, while molar volume of the glasses tends to increase with concentration of Sm2O3.. In absorption spectra, there are 2 obvious peaks in UV-VIS range and 6 peaks in NIR range indicating the Sm3+in glass matrices. The sharpness of a peak, in the absorption spectra, also increases with concentration of the dopant. The 7 obvious peaks in excitation spectra represent the transitions from the ground state6H5/2to various excited states. Furthermore, The emission spectra were observed under 404 nm light from the Xenon compact arc lamps, and showed the concentration quenching effect (CQE) at 1.00 mol% of Sm3+. Additional, The lifetimes showed decreasing trend with concentration of Sm2O3.. As the result, The LGBO:Sm3+glass doped with 1.00 mol% of Sm3+gives the highest result for luminescence properties.

Luminescent Properties of ZnxCa1–xTiO3:yPr3+ Long-Lasting Phosphors

2016 ◽  
Vol 35 (9) ◽  
pp. 963-966
Author(s):  
Yanzhi Meng ◽  
Xiaomin Wang ◽  
Yi Shen ◽  
Xiaoli Wei ◽  
Liying Han ◽  
...  
Keyword(s):  
Sol Gel ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Concentration Quenching ◽  
Molar Concentration ◽  
X Ray Diffraction ◽  
Gel Method ◽  
X Ray ◽  
Quenching Effect ◽  
Concentration Quenching Effect

AbstractThe red long-lasting phosphors (LLPs) ZnxCa1–xTiO3:yPr3+ (ZCTP) were successfully prepared via the sol–gel method. The effects of Zn2+ content and Pr3+ molar concentration on the luminescent properties of ZCTP LLPs were characterized by X-ray diffraction, excitation and emission spectra, long-lasting decay curves and thermoluminescence (TL) curves. In this study, the results indicated that luminescent properties of Zn0.2Ca0.8TiO3:0.2 %Pr3+ phosphor was the best. In addition, when Pr3+ molar concentration reached 0.8 mol %, concentration quenching effect was obvious.

Investigation of Er3+ Doped in Na2O-Al2O3-BaO-CaO-Sb2O3-B2O3 -SiO2 Glasses: Physical, Optical and Visible Luminescence Properties

2014 ◽  
Vol 974 ◽  
pp. 86-90
Author(s):  
S. Tuscharoen ◽  
N. Chanthima ◽  
J. Kaewkhao
Keyword(s):  
Molecular Weight ◽  
Green Emission ◽  
Concentration Quenching ◽  
Luminescence Properties ◽  
Doping Content ◽  
Quenching Effect ◽  
Visible Luminescence ◽  
Additional Doping ◽  
Glass Matrices ◽  
Concentration Quenching Effect

In this work, Na2O-Al2O3-BaO-CaO-Sb2O3-B2O3-SiO2 glasses doped with Er3+ was prepared and investigated for their physical, optical and visible luminescence properties. The increases in density, refractive index and molar volume of the glasses with additional doping content of Er2O3 into the network were due to a higher molecular weight and polarizability of Er2O3 in comparison with the glass former (SiO2 and B2O3). Ten absorption peaks were observed as a nature of Er3+ absorption in glass matrices. The glass exhibited four emission transitions which were assigned to 4F5/2→4I15/2 (460 nm), 4F7/2→4I15/2 (487 nm), 2H11/2→4I15/2 (522 nm) and 4S3/2→4I15/2 (545 nm) transitions. The strongest intensity was the green emission at 522 nm. The luminescence intensity was found to increase with Er2O3 content up to 4 mol% and it was decreased for higher Er2O3 contents due to concentration quenching effect.

Modeling of thermoluminescence in SrY2O4:Eu3+and their concentration quenching effect

Optik ◽  
2021 ◽  
Vol 232 ◽  
pp. 166607
Author(s):  
Amirouche Bouremani ◽  
Dahane Kadri ◽  
Ahmed Kadari ◽  
Vikas Dubey
Keyword(s):  
Concentration Quenching ◽  
Quenching Effect ◽  
Concentration Quenching Effect

NIR and Upconversion Luminescence Properties of Nd3+ Doped in Gd2O3-CaO-SiO2-B2O3 Glass System

2014 ◽  
Vol 548-549 ◽  
pp. 124-128 ◽  
Author(s):  
S. Insiripong ◽  
S. Kaewjeang ◽  
U. Maghanemi ◽  
H.J. Kim ◽  
N. Chanthima ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Optical Absorption ◽  
Absorption Spectra ◽  
Upconversion Luminescence ◽  
Emission Spectra ◽  
Concentration Quenching ◽  
Luminescence Spectra ◽  
Optical Absorption Spectra ◽  
Glass Matrices ◽  
Nir Luminescence

In this work, properties of Nd3+ in Gd2O3-CaO-SiO2-B2O3 glass systems with composition 25Gd2O3-10CaO-10SiO2-(55-x)B2O3-xNd2O3 where x = 0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 mol% were investigated. The optical absorption spectra show peaks at 4F3/2 (877 nm) , 4F5/2+2H9/2 (802 nm), 4F7/2+4S3/2 (743 nm), 4F9/2 (682 nm), 2H11/2 (627 nm), 2G7/2 +4G5/2 (582 nm), 4G7/2 +2K13/2 (527 nm), 4G11/2 (481 nm), 2P1/2 (427 nm) and 2L15/2 + 4D1/2 + 1I11/2+ 4D5/2+ 4D3/2 (355 nm) reflecting the Nd3+ ions in glass matrices. The densities were increased with increasing of Nd2O3 concentration. This indicates the increase of the molecular weight by the replacement of B2O3 with a heavier Nd2O3 oxide in the glass. The upconversion luminescence spectra show bands at 393 nm for all Nd2O3 concentration and the strongest intensity from 2.5 % mol of Nd2O3 was obtained. For NIR luminescence, the intensity of Nd3+ emission spectra increases with increasing concentrations of Nd3+ up to 1.5 mol% and beyond 1.5 mol% the concentration quenching is observed.

Ester-functionalized thermally activated delayed fluorescence materials

2021 ◽  
Author(s):  
Hiroshi Tasaki ◽  
So Shikita ◽  
In Seob Park ◽  
Takuma Yasuda
Keyword(s):  
Delayed Fluorescence ◽  
Concentration Quenching ◽  
Thermally Activated Delayed Fluorescence ◽  
Quenching Effect ◽  
Thermally Activated ◽  
Concentration Quenching Effect ◽  
Neat Films

A family of thermally activated delayed fluorescence (TADF) materials functionalized with carboxylate esters is presented herein. Owing to their suppressed concentration-quenching effect in neat films, these ester-functionalized TADF emitters could...

Highly Efficient and Thermally Stable Eu2+-Doped Ca9Nd(PO4)7 Phosphor for Near-Ultraviolet White-Emission LED Applications

2021 ◽  
Vol 21 (12) ◽  
pp. 5859-5866
Author(s):  
Jian Zhou ◽  
Si-Li Ren
Keyword(s):  
Room Temperature ◽  
Green Emission ◽  
Color Temperature ◽  
Multipole Interaction ◽  
Interaction Radius ◽  
Promising Alternative ◽  
Quenching Effect ◽  
Near Ultraviolet ◽  
Great Performance ◽  
Concentration Quenching Effect

Various Eu2+-based Ca9Nd(PO4)7 (CNP:xEu2+, with different x values) materials are prepared via facile solid-state reaction. Their crystal structures are investigated in detail by means of the Rietveld refinement. The structure of CNP:Eu2+ with a trigonal lattice is analogous to that of β-Ca3(PO4)2. Therefore, Eu2+ ions tend to incorporate calcium sites in the host. All the obtained samples can be excited using near ultraviolet (nUV) light to present blue-green emission. An optimal dopant concentration is verified at x = 0.8 with a large critical interaction radius (11.21 Å). The mechanism of the concentration quenching effect is assigned to the multipole-multipole interaction. CNP:xEu2+ possesses a short decay lifetime of ∼60 μs and can endure severe working conditions thanks to its great thermal stability. The relative photoluminescence (PL) intensity of CNP:0.8Eu2+ can retain 84.75% of the pristine intensity measured at room temperature, and the relative intensity remains as high as 69.97% at 423 K. The CNP:Eu2+ phosphors also show great performance in the WLED demonstration. The correlated color temperature (CCT) of the prototype device is 3404 K, with an extremely high Ra (97.6). Therefore, CNP:xEu2+ could be regarded as a promising alternative to blue green phosphors in nUV chip-based WLED applications.

Correlations between the structural transformations and concentration quenching effect for RE-implanted ZnO systems

2020 ◽  
Vol 521 ◽  
pp. 146421
Author(s):  
Renata Ratajczak ◽  
Cyprian Mieszczynski ◽  
Sławomir Prucnal ◽  
Tomasz A. Krajewski ◽  
Elżbieta Guziewicz ◽  
...  
Keyword(s):  
Structural Transformations ◽  
Concentration Quenching ◽  
Quenching Effect ◽  
Concentration Quenching Effect

scholarly journals Bi3+ Effects on Down-/up-conversion Luminescence, Temperature Sensing and Optical Transition Properties in Bi3+/Er3+ Co-doped YNbO4  Phosphors

2020 ◽  
Author(s):  
Xin Wang ◽  
Xiangping Li ◽  
Hongquan Yu ◽  
Sai Xu ◽  
Jiashi Sun ◽  
...  
Keyword(s):  
Near Infrared ◽  
Optical Transition ◽  
Green Emission ◽  
Radiative Transition ◽  
Solid State Reaction Method ◽  
Temperature Sensing ◽  
Infrared Light ◽  
Luminescence Spectra ◽  
Experimental Values ◽  
Co Doped

Abstract A series of Bi3+ single-doped and Bi3+/Er3+ co-doped YNbO4 phosphors with various concentrations of Bi3+ ions were prepared by a conventional high temperature solid-state reaction method. The results of XRD and Rietveld refinement confirmed that monoclinic phase YNbO4 samples were achieved. The down-/up-conversion luminescence of Er3+ ions were investigated under the excitation of ultraviolet light (327 nm) and near infrared light (980 nm). Under 327 nm excitation, broad visible emission band from Bi3+ ions and characteristic green emission peaks from Er3+ ions were simultaneously observed, while only strong green emissions from Er3+ ions were detected upon excitation of 980 nm. Remarkable emission enhancement was observed in down-/up-conversion luminescence processes by introducing Bi3+ ions into Er3+-doped YNbO4 phosphors. By analyzing the laser working current dependent up-conversion luminescence spectra, two-photon processes were confirmed to be responsible for both the green and the red up-conversion emissions of Er3+ ion. The temperature sensing property of Er3+ was studied by using the temperature dependent up-conversion luminescence spectra and it was found that the temperature sensitivity was sensitive to the doping concentration of Bi3+ ions. By comparing the experimental values of the radiative transition rate ratio of the two green emission levels of Er3+ ions and the theoretical values calculated by Judd-Ofelt (J-O) theory, it was concluded that energy level splitting had significant influences on the temperature sensing property of Er3+ ions.

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