scholarly journals Energy Transfer Studies in Tb3+-Yb3+ Co-Doped Phosphate Glasses

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6782
Author(s):  
Hadil Benrejeb ◽  
Kevin Soler-Carracedo ◽  
Antonio Diego Lozano-Gorrín ◽  
Sana Hraiech ◽  
Inocencio Rafael Martin Benenzuela
Keyword(s):  
Energy Transfer ◽  
Near Infrared ◽  
Emission Spectra ◽  
Excitation Power ◽  
Phosphate Glasses ◽  
Energy Transfer Mechanism ◽  
Blue Excitation ◽  
Decay Times ◽  
Infrared Excitation ◽  
Co Doped

Detailed optical properties of Tb3+-Yb3+ co-doped phosphate glasses were performed based on their emission spectra and decay measurements. Under blue excitation of Tb3+ at 488 nm, the intensity of Yb3+ emissions gradually enhanced upon increasing the Yb3+ content until 1 mol% indicated an energy transfer from Tb3+ to Yb3+. Otherwise, under near infrared excitation of Yb3+ at 980 nm, these glasses exhibit intense green luminescence, which led to cooperative sensitization of the 5D4 level of Tb3+ ions. A cooperative energy transfer mechanism was proposed on the basis of the study on the influence of Yb3+ concentration on up-conversion emission intensity, as well as the dependence of this up-conversion intensity on near infrared excitation power. Moreover, the temporal evolution of the up-conversion emissions have been studied, which was in positive agreement with a theoretical model of cooperative up-conversion luminescence that showed a temporal emission curve with rise and decay times of the involved levels.

scholarly journals Luminescent Properties and Energy Transfer Mechanism of Gd3+ and Eu2+ Co-doped Phosphate Glasses

2015 ◽  
Vol 28 (4) ◽  
pp. 487-491 ◽  
Author(s):  
Qian Wang ◽  
Shao-Ye Ouyang ◽  
Wei-Huan Zhang ◽  
Bin Yang ◽  
Yue-Pin Zhang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Luminescent Properties ◽  
Phosphate Glasses ◽  
Transfer Mechanism ◽  
Energy Transfer Mechanism ◽  
Co Doped

Downconversion for Solar Cells in Sr3Gd(PO4)3:Tb, Yb Phosphors

2012 ◽  
Vol 502 ◽  
pp. 136-139 ◽  
Author(s):  
Jia Yue Sun ◽  
Yi Ning Sun ◽  
Ji Cheng Zhu ◽  
Jun Hui Zeng ◽  
Hai Yan Du
Keyword(s):  
Energy Transfer ◽  
Solar Cell ◽  
Near Infrared ◽  
Emission Spectra ◽  
Fluorescence Decay ◽  
Quantum Cutting ◽  
Silicon Based ◽  
Visible Photon ◽  
Co Doped ◽  
Cooperative Energy

An efficient near-infrared (NIR) quantum cutting (QC) Tb3+ and Yb3+ co-doped phosphor Sr3Gd(PO4)3 has been synthesized by conventional high temperature solid technique. Upon excitation of Tb3+ with a visible photon at 485 nm, two NIR photons could be emitted by Yb3+ through cooperative energy transfer (CTE) from Tb3+ to two Yb3+ ions. Excitation and emission spectra as well as fluorescence decay measurements have been carried out to examine the occurrence of cooperative energy transfer (CET ) from Tb3+ to Yb3+ ions. The result indicates Tb3+ and Yb3+ co-doped Sr3Gd(PO4)3 is potentially used as down-converter layer in silicon-based solar cell.

Near Infrared Quantum Cutting of Tb3+–Yb3+ Co-Doped CeF3 Nanophosphors

2016 ◽  
Vol 16 (4) ◽  
pp. 3577-3582
Author(s):  
Sun Xiao ◽  
Hu Xiao-Yun ◽  
Hou Wen-Qian ◽  
Fan Jun ◽  
Miao Hui ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Solar Cells ◽  
Near Infrared ◽  
Emission Spectra ◽  
Infrared Emission ◽  
Emission Area ◽  
Energy Transfers ◽  
Quantum Cutting ◽  
Near Infrared Emission ◽  
Co Doped

In this paper, Tb3+–Yb3+ Co-doped CeF3 nanophosphors were synthesized using the microwave-assisted heating hydrothermal method (M–H). The excitation and emission spectra of the samples at room temperature show that the samples absorb ultraviolet light from 250 nm to 280 nm, and emit light at 300 nm. This corresponds to the transitions from 5D to 4F of Ce3+, 480 nm, 540 nm, 583 nm, 620 nm which correspond to the transitions from 5D4 to 7F6,5,4,3 of Tb3+, 973 nm which corresponds to the transitions from 2F5/2–2F7/2 of Yb3+. In the emission spectra, it is clear that the emission intensity of Ce3+ and Tb3+ decreases, and Yb3+ increases with increasing Yb3+. This suggests that energy transfer from Ce3+ to Yb3+, and Ce3+ to Tb3+ to Yb3+ may occur. In the near infrared emission area, it is noted that a distinct emission centered at 973 nm was observed under 260 nm excitation. This is due to transitions among the different Stark levels of 2FJ(J=5/2, 7/2) Yb3+ ions. This also suggests an energy transfer from Ce3+ ions to Tb3+ and then to Yb3+. The energy transfers from Tb3+–Yb3+ Co-doped CeF3 nanophosphors, which lead to intense NIR emissions at 900–1050 nm, match the energy of Si band gaps of Si-based solar cells. Therefore, these kinds of materials are promising candidates for applications that require modifying if solar spectrums and enhancement of conversion efficiency of Si-based solar cells.

Efficient near-infrared downconversion and energy transfer mechanism in Pr3+/Yb3+ co-doped Na5Y9F32 single crystals

2019 ◽  
Vol 205 ◽  
pp. 500-507 ◽  
Author(s):  
Jianxu Hu ◽  
Yun Zhao ◽  
Baojiu Chen ◽  
Haiping Xia ◽  
Yuanpeng Zhang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Single Crystals ◽  
Near Infrared ◽  
Transfer Mechanism ◽  
Energy Transfer Mechanism ◽  
Co Doped

scholarly journals Efficient near-infrared downconversion and energy transfer mechanism in Tb^4+-Yb^3+ co-doped NaYF_4 nanoparticles

2016 ◽  
Vol 6 (9) ◽  
pp. 2769 ◽  
Author(s):  
Biao Zheng ◽  
Lin Lin ◽  
Senyuan Xu ◽  
Zhezhe Wang ◽  
Zhuohong Feng ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Near Infrared ◽  
Transfer Mechanism ◽  
Energy Transfer Mechanism ◽  
Co Doped

Luminescence Properties and energy transfer mechanism of Eu3+ and Tm3+ Co-doped AlN Thin Films

2021 ◽  
pp. 118082
Author(s):  
Hai Ma ◽  
Xiaodan Wang ◽  
Feifei Chen ◽  
Jiafan Chen ◽  
Xionghui Zeng ◽  
...  
Keyword(s):  
Thin Films ◽  
Energy Transfer ◽  
Transfer Mechanism ◽  
Luminescence Properties ◽  
Energy Transfer Mechanism ◽  
Co Doped

scholarly journals Upconversion Luminescence of Silica–Calcia Nanoparticles Co-doped with Tm3+ and Yb3+ Ions

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 937
Author(s):  
Katarzyna Halubek-Gluchowska ◽  
Damian Szymański ◽  
Thi Ngoc Lam Tran ◽  
Maurizio Ferrari ◽  
Anna Lukowiak
Keyword(s):  
Energy Transfer ◽  
Near Infrared ◽  
Upconversion Luminescence ◽  
Sol Gel ◽  
Emission Spectra ◽  
Transmission Electron ◽  
Characteristic Emission ◽  
Diffraction Patterns ◽  
Size Of Particles ◽  
Average Size

Looking for upconverting biocompatible nanoparticles, we have prepared by the sol–gel method, silica–calcia glass nanopowders doped with different concentration of Tm3+ and Yb3+ ions (Tm3+ from 0.15 mol% up to 0.5 mol% and Yb3+ from 1 mol% up to 4 mol%) and characterized their structure, morphology, and optical properties. X-ray diffraction patterns indicated an amorphous phase of the silica-based glass with partial crystallization of samples with a higher content of lanthanides ions. Transmission electron microscopy images showed that the average size of particles decreased with increasing lanthanides content. The upconversion (UC) emission spectra and fluorescence lifetimes were registered under near infrared excitation (980 nm) at room temperature to study the energy transfer between Yb3+ and Tm3+ at various active ions concentrations. Characteristic emission bands of Tm3+ ions in the range of 350 nm to 850 nm were observed. To understand the mechanism of Yb3+–Tm3+ UC energy transfer in the SiO2–CaO powders, the kinetics of luminescence decays were studied.

Near infrared fluorescence and energy transfer in Ce/Nd Co-doped CaxSr1−xS

2011 ◽  
Vol 131 (1) ◽  
pp. 134-137 ◽  
Author(s):  
Jian-Xin Meng ◽  
Wen-Jiao Wan ◽  
Li-Li Fan ◽  
Chuang-Tao Yang ◽  
Qing-Qing Chen ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Near Infrared ◽  
Near Infrared Fluorescence ◽  
Co Doped
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