Tunable dual emission of Ca3Al4ZnO10:Bi3+,Mn4+via energy transfer for indoor plant growth lighting

2018 ◽  
Vol 6 (33) ◽  
pp. 8914-8922 ◽  
Author(s):  
Zhi Zhou ◽  
Yuan Zhong ◽  
Mao Xia ◽  
Nan Zhou ◽  
Bingfu Lei ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Plant Growth ◽  
Absorption Spectra ◽  
Emission Spectra ◽  
Plant Pigments ◽  
Dual Emission ◽  
Co Doped

The emission spectra of Bi3+ and Mn4+ co-doped Ca3Al4ZnO10 phosphors match well with the absorption spectra of plant pigments for indoor plant growth lighting.

Tunable dual emission of Bi3+ and Mn4+ co-doped LaMg0.598Nb0.402O3 double perovskite via energy transfer for plant growth lighting

2020 ◽  
Vol 126 ◽  
pp. 110814 ◽  
Author(s):  
Hang Zhang ◽  
Hang Yang ◽  
Xiangjie Ma ◽  
Guogang Li ◽  
Shiqi Liu ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Plant Growth ◽  
Double Perovskite ◽  
Dual Emission ◽  
Co Doped

Tunable blue-red dual emission via energy transfer in Na4CaSi3O9: Ce3+, Mn2+ phosphors for plant growth LED

2021 ◽  
pp. 118029
Author(s):  
Ge Zhang ◽  
Yuan Yin ◽  
Yaoan Wang ◽  
Shuaishuai Yu ◽  
Jia Zhang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Plant Growth ◽  
Dual Emission

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.

scholarly journals 2.0 μm Ultra Broadband Emission from Tm3+/Ho3+ Co-Doped Gallium Tellurite Glasses for Broadband Light Sources and Tunable Fiber Lasers

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 190
Author(s):  
Jian Yuan ◽  
Weichao Wang ◽  
Yichen Ye ◽  
Tingting Deng ◽  
Yizhao Huang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Fiber Lasers ◽  
Emission Cross Section ◽  
Emission Spectra ◽  
Gain Coefficient ◽  
Light Sources ◽  
Tellurite Glasses ◽  
Broadband Emission ◽  
Forward Energy ◽  
Co Doped

A flat 2.0 μm ultra broadband emission with a full width at half maximum (FWHM) of 329 nm is achieved in 1 mol.% Tm2O3 and 0.05 mol.% Ho2O3 co-doped gallium tellurite glasses upon the excitation of an 808 nm laser diode. The influence of Tm3+ and Ho3+ contents on 2.0 μm spectroscopic properties of gallium tellurite glasses is minutely investigated by absorption spectra, emission spectra, and lifetime measurement. In addition, emission cross section and gain coefficient of Ho3+ ions at 2.0 μm are calculated, and the maximum values reach 8.2 × 10−21 cm2 and 1.54 cm−1, respectively. Moreover, forward and backward energy transfer probability between Tm3+ and Ho3+ ions are qualitatively evaluated by the extended spectral overlap method. Large ratio of the forward energy transfer from Tm3+ to Ho3+ to the backward one (19.7) and high forward energy transfer coefficient (6.22 × 1039 cm6/s) are responsible for effective 2.0 μm emission from Ho3+ ions. These results manifest that Tm3+/Ho3+ co-doped gallium tellurite glass is suitable for potential applications of broadband light sources and tunable fiber lasers operating in eye-safe 2.0 µm spectral region.

Dy3+@Mn4+co-doped Ca14Ga10−mAlmZn6O35far-red emitting phosphors with high brightness and improved luminescence and energy transfer properties for plant growth LED lights

2017 ◽  
Vol 5 (32) ◽  
pp. 8201-8210 ◽  
Author(s):  
Zhi Zhou ◽  
Mao Xia ◽  
Yuan Zhong ◽  
Shujie Gai ◽  
Shengxiong Huang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Plant Growth ◽  
Solid State Reaction Method ◽  
High Brightness ◽  
Red Phosphor ◽  
Led Lighting ◽  
Effective Energy Transfer ◽  
Led Lights ◽  
Transfer Properties ◽  
Co Doped

A novel deep red phosphor Ca14Ga10−mAlmZn6O35:Dy3+,Mn4+(CGAZO:Dy3+,Mn4+) for plant growth LED lighting was successfully synthesizedviahigh-temperature solid-state reaction method and an effective energy transfer from Dy3+to Mn4+in the CGAZO host had been verified.

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.

Emission spectra and energy transfer studies in Dy3+ and Dy3+/Eu3+ co-doped potassium fluorophosphate glasses for white light applications

2019 ◽  
Vol 205 ◽  
pp. 190-196 ◽  
Author(s):  
K. Anilkumar ◽  
S. Damodaraiah ◽  
S. Babu ◽  
V. Reddy Prasad ◽  
Y.C. Ratnakaram
Keyword(s):  
Energy Transfer ◽  
White Light ◽  
Emission Spectra ◽  
Co Doped

scholarly journals Efficiency of Energy Transfer for TiO2 Nanoparticles with Fluorescein Dye

2019 ◽  
Vol 29 (4) ◽  
pp. 134
Author(s):  
Mahasin F. Hadi Al-Kadhemy ◽  
Asrar Abdulmunem ◽  
Husam Sabeeh Al-Arab
Keyword(s):  
Energy Transfer ◽  
Tio2 Nanoparticles ◽  
Absorption Spectra ◽  
Water Solution ◽  
Resonance Energy Transfer ◽  
Fluorescence Emission ◽  
Resonance Energy ◽  
Emission Spectra ◽  
Major Effect ◽  
Fluorescence Emission Spectra

For different amount of masses of TiO2 nanoparticles in dye solution, absorption and Fluorescence profiles of the suspension for TiO2 nanoparticles with Fluorescein (F) in distilled water solution, has been explored. An absorption spectra enhancement were detected for changed amount of masses, which specifies that the doping with TiO2 nanoparticles has a major effect on the dye absorption spectra. Contrarily, all fluorescence emission spectra for the dye, were quenched as TiO2 nanoparticles amount of masses increases because of Förster resonance energy transfer (FRET).

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.

Untersuchungen an Chrom-Leuchtzentren in Magnesiumtitanat

1969 ◽  
Vol 24 (9) ◽  
pp. 1323-1328
Author(s):  
R. Dittmann ◽  
D. Hahn ◽  
J. Stade
Keyword(s):  
Energy Transfer ◽  
Absorption Spectra ◽  
Room Temperature ◽  
Emission Spectra ◽  
Activator Concentration ◽  
Excitation Spectra ◽  
Oxygen Ions ◽  
The Difference

Chromium activated powdery Mg2TiO4 was prepared using the oxides MgO and TiO2 with LiCl as a flux. The preparation was realized by two annealing processes one after another at 850 °C and 1400 °C for activated specimens and for samples without activator. The excitation spectra were measured at room temperature and 77 K. The difference in remission was investigated at 293 K for activated samples and specimens without chromium and also the difference in absorption for the same samples. The excitation-, remission- and absorption spectra show three peaks with a different behaviour if the activator concentration increases. Therefore the chromium luminescence centres in the Mg2TiO4 prove to be Cr3+-ions surrounded by six oxygen ions and chromium clusters respectively. The assumption of two different luminescence centres is supported by the results of the emission spectra. An energy transfer exists between these two types of centres and depends on the activator concentration.

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