On observation of the downconversion mechanism in Er3+/Yb3+ co-doped tellurite glass using thermal and optical parameters

Figueiredo, M. S.; Santos, Felipe A.; Yukimitu, K.; Moraes, João Carlos Silos; Nunes, L.A.O.; Andrade, L.H.C.; Lima, S.M.

doi:10.1016/j.jlumin.2014.09.010

Cited by 28 publications

(10 citation statements)

References 36 publications

(23 reference statements)

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“…These properties make tellurite glasses suitable for applications involving third harmonic generation or optical Kerr effects [5][6][7]. Tellurite glasses are also strong candidates for super-high speed optical switches or shutters, and are promising materials for use in fiber optics [8] and solar cells [9,10,11] when they are doped and/or co-doped with rare earth or transition metal ions.…”

Section: Introductionmentioning

confidence: 99%

Observation of a Te4+ center with broad red emission band and high fluorescence quantum efficiency in TeO2-Li2O glass

Costa

Souza

Langaro

et al. 2018

Journal of Luminescence

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A B S T R A C TIn this work, a lithium tellurite glass (80TeO 2 − 20Li 2 O, in mol%) was synthesized and its optical properties were analyzed. This glass matrix has been extensively studied, mainly due to its highly nonlinear optical properties, but there have been no reports concerning its luminescence properties. To the best of our knowledge, this is the first observation of visible emission related to Te 4+ centers in a lithium tellurite glass. A broad and intense emission band was centered at 650 nm and there was a broad excitation band in the UV-Vis region. The emission lifetime at room temperature was approximately 7.0 ± 0.2 μs and the fluorescence quantum efficiency was 63 ± 6%. These characteristics indicated that the system consisting of Te 4+ centers in lithium tellurite glass is a good candidate as a phosphor material for various applications.

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Section: Introductionmentioning

confidence: 99%

Observation of a Te4+ center with broad red emission band and high fluorescence quantum efficiency in TeO2-Li2O glass

Costa

Souza

Langaro

et al. 2018

Journal of Luminescence

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“…4 Currently no one has been able to demonstrate an external quantum efficiency of more than 100% with photons from the solar spectrum experimentally, even though down conversion has been reported numerous times. [5][6][7][8][9][10][11][12] The Tb 3+ /Yb 3+ couple has been proven to display second order cooperative energy transfer (CET), 5 but due to the intraconfigurational 4f transitions being parity forbidden, the absorption cross section of Tb 3+ and other suitable lanthanides like Tm 3+ and Pr 3+ is extremely poor. Thus, they are not very useful as conversion materials for solar cells on their own.…”

Section: Introductionmentioning

confidence: 99%

Luminescent YbVO₄ by atomic layer deposition

et al. 2017

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UV to visible and near-infrared converting thin films of YbVO have been deposited by atomic layer deposition, using the precursor combinations Yb(thd) (thd = 2,2,6,6-tetramethyl-3,5-heptanedione) and O, and VO(thd) and O at a deposition temperature of 240 °C, followed by post deposition annealing at 400-1000 °C. The UV absorption and the visible and near-infrared emission have been investigated in detail. The structure, thickness and composition of the deposited films have been studied by X-ray diffraction, ellipsometry, and X-ray fluorescence, respectively. The optimal pulse ratio of Yb(thd) and VO(thd) with respect to near-infrared emission was found to be 1 : 3, which also yielded the most crystalline sample after annealing. Crystallization of the films is accelerated when an excess of VO is present, enabling crystallization at temperatures as low as 500 °C, probably through a flux aided process.

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“…Different glasses have also been investigated as the host material for this purpose; these include fluoride, borate, and silicate glasses. More recently, TeO 2 ‐based glasses have also shown potential for such applications . Tellurite glasses present advantageous properties, such as low phonon energy (600‐750 cm −1 ), wide optical transparency range (from 0.4 to 6 μm), higher rare‐earth solubility compared to other oxide glasses, good thermal and chemical stability, and a low melting point …”

Section: Introductionmentioning

confidence: 99%

“…More recently, TeO 2 -based glasses have also shown potential for such applications. [15][16][17][18] Tellurite glasses present advantageous properties, such as low phonon energy (600-750 cm À1 ), 4 wide optical transparency range (from 0.4 to 6 lm), higher rare-earth solubility compared to other oxide glasses, 19 good thermal and chemical stability, and a low melting point. 20 In this work, we investigated the spectroscopic properties of Nd 3+ -Yb 3+ co-doped tungsten-tellurite glasses as a function of Yb 3+ concentration.…”

Section: Introductionmentioning

confidence: 99%

High Nd³⁺→Yb³⁺ energy transfer efficiency in tungsten‐tellurite glass: A promising converter for solar cells

et al. 2017

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This work reports on the energy transfer efficiency for Nd3+/Yb3+ co‐doped tellurite glasses (80TO2‐20WO3, in mol%,). The correlation between Yb3+ ion concentration and the downconversion mechanism was investigated using optical and thermal lens spectroscopies, which enabled investigation of the radiative and nonradiative processes, respectively, involved in energy transfer from neodymium to ytterbium. The Nd3+ near‐infrared fluorescence disappeared almost entirely when the maximum concentration of Yb3+ ions (4 mol%) was doped into the host. In contrast, there was a corresponding increase in the ytterbium emission at around 980 nm. When ytterbium was added, there was also a simultaneous reduction in the amount of heat generated by the sample due to a reduction in the nonradiative decay rate, corroborating the suspected high energy transfer efficiency of Nd3+→Yb3+. The results indicate that tungsten‐tellurite glasses may be of potential use in solar cells for matching the solar emission spectrum to the semiconductor cell.

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On observation of the downconversion mechanism in Er3+/Yb3+ co-doped tellurite glass using thermal and optical parameters

Cited by 28 publications

References 36 publications

Observation of a Te4+ center with broad red emission band and high fluorescence quantum efficiency in TeO2-Li2O glass

Observation of a Te4+ center with broad red emission band and high fluorescence quantum efficiency in TeO2-Li2O glass

Luminescent YbVO₄ by atomic layer deposition

High Nd³⁺→Yb³⁺ energy transfer efficiency in tungsten‐tellurite glass: A promising converter for solar cells

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On observation of the downconversion mechanism in Er3+/Yb3+ co-doped tellurite glass using thermal and optical parameters

Cited by 28 publications

References 36 publications

Observation of a Te4+ center with broad red emission band and high fluorescence quantum efficiency in TeO2-Li2O glass

Observation of a Te4+ center with broad red emission band and high fluorescence quantum efficiency in TeO2-Li2O glass

Luminescent YbVO4 by atomic layer deposition

High Nd3+→Yb3+ energy transfer efficiency in tungsten‐tellurite glass: A promising converter for solar cells

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Product

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Luminescent YbVO₄ by atomic layer deposition

High Nd³⁺→Yb³⁺ energy transfer efficiency in tungsten‐tellurite glass: A promising converter for solar cells