Spectral shifting and NIR down-conversion in Bi3+/Yb3+ co-doped Zn2GeO4

Gao, Guojun; Peng, Mingying; Wondraczek, Lothar

doi:10.1039/c4tc01242a

Cited by 45 publications

(25 citation statements)

References 43 publications

(69 reference statements)

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“…Attempts to use Bi 3þ ions as the donors are also known. [23,24] The observation of cooperative transfer of electronhole pairs energy to Yb 3þ ions in wide bandgap semiconductors is reported in the studies by Gao et al and Ye et al [24,25] Previous studies [19,26,27] , assure, that just these complexes play the role of donor centers in the studied crystals. We have also performed the studies of downconversion properties of some molybdate and tungstate crystals of Scheelite family, Yb: NaLa(MoO 4 ) 2 , Yb:NaGd(MoO 4 ) 2 , [28,29] Yb:NaY(WO 4 ) 2 , and some mixed compositions [30] with various Yb concentrations.…”

Section: Introductionmentioning

confidence: 75%

“…Moreover, they do not promote the nonradiative depopulation of the 2 F 5/2 ytterbium‐excited state. Attempts to use Bi 3+ ions as the donors are also known . The observation of cooperative transfer of electron–hole pairs energy to Yb 3+ ions in wide bandgap semiconductors is reported in the studies by Gao et al and Ye et al…”

Section: Introductionmentioning

confidence: 95%

“…[11,15,20] Considering these drawbacks, researchers are trying also to develop the cooperative downconversion schemes with other kinds of donors, in particular, with Eu 2þ , Ce 3þ , and Yb 2þ ions. [9,10,13,17,18,[23][24][25] Due to 4f-5d or charge transfer transitions, these ions exhibit rather broad and very intensive absorption bands in the blue and UV spectral ranges. Moreover, they do not promote the nonradiative depopulation of the 2 F 5/2 ytterbiumexcited state.…”

Section: Introductionmentioning

confidence: 99%

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Donor Centers Involved into the Quantum Cutting in Ytterbium‐Doped Scheelite‐Like Crystals

Субботин

Titov

Lis

et al. 2019

Physica Status Solidi (a)

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Yb‐doped Scheelite‐like molybdate and tungstate single crystals are promising quantum‐cutting materials. The cooperative downconversion from donor centers to Yb ions occurs in heavily Yb‐doped crystals of this family. This phenomenon can substantially raise the efficiency of crystalline silicon photovoltaic cells. However, the nature of donor centers is still unknown. Herein, several versions of this nature are tested and discussed: Yb3+ ion (its high‐energy charge transfer states); Yb2+ ion; self‐trapped exciton at molybdate/tungstate complex; color centers based on oxygen vacancies; accidental impurities. To test these assumptions, a series of Scheelite‐like molybdate and tungstate single crystals (CaMoO4, CaWO4, NaLa(MoO4)2, NaGd(MoO4)2, NaGd(WO4)2, and NaY1−xGdx(WO4)2) are grown, both undoped and doped with different Yb‐concentrations. The complex spectroscopic investigations of these crystals are performed. As a result of the studies, three versions, self‐trapped excitons at [MoO4]/[WO4] complexes, color centers at oxygen vacancies, and accidental impurities, coming into the crystals with MoO3, are rejected. The applicability of the other versions should be refined.

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Section: Introductionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Donor Centers Involved into the Quantum Cutting in Ytterbium‐Doped Scheelite‐Like Crystals

Субботин

Titov

Lis

et al. 2019

Physica Status Solidi (a)

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“…7 as well as the energy transfer efficiency ( η ). The energy transfer rate (W ET ) and energy transfer efficiency (η) were evaluated by using the following equation323334…”

Section: Resultsmentioning

confidence: 99%

2 μm emission properties and nonresonant energy transfer of Er3+ and Ho3+ codoped silicate glasses

Cao

Tian

et al. 2016

Sci Rep

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2.0 μm emission properties of Er3+/Ho3+ codoped silicate glasses were investigated pumped by 980 nm LD. Absorption spectra were determined. Intense mid-infrared emissions near 2 μm are observed. The spectral components of the 2 μm fluorescence band were analyzed and an equivalent model of four-level system was proposed to describe broadband 2 μm emission. Low OH− absorption coefficient (0.23 cm−1), high fluorescence lifetime (2.95 ms) and large emission cross section (5.61 × 10−21 cm2) corresponding to Ho3+: 5I7→5I8 transition were obtained from the prepared glass. Additionally, energy transfer efficiency from the Er3+: 4I13/2 to the Ho3+: 5I7 level can reach as high as 85.9% at 0.75 mol% Ho2O3 doping concentration. Energy transfer microscopic parameters (CDA) via the host-assisted spectral overlap function were also calculated to elucidate the observed 2 μm emissions in detail. Moreover, the rate equation model between Er3+ and Ho3+ ions was developed to elucidate 2 μm fluorescence behaviors with the change of Ho3+ concentration. All results reveal that Er3+/Ho3+ codoped silicate glass is a promising material for improving the Ho3+ 2.0 μm fiber laser performance.

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“…5(c). The energy transfer rate (W ET ) and energy transfer efficiency (η ET ) were evaluated by using the following equation [38,[44][45][46]:…”

Section: Energy Transfer Mechanism and Microscopic Parametersmentioning

confidence: 99%

Broadband 2μm fluorescence and energy transfer evaluation in Ho3+/Er3+ codoped germanosilicate glass

Wei

Tian

Cai

et al. 2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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Spectral shifting and NIR down-conversion in Bi³⁺/Yb³⁺ co-doped Zn₂GeO₄

Abstract: We report on Zn2GeO4 co-doped with Yb3+ and Bi3+ as a model system for ultra-efficient down-conversion of the UV-A/blue part of the solar spectrum to the NIR.

Cited by 45 publications

References 43 publications

Donor Centers Involved into the Quantum Cutting in Ytterbium‐Doped Scheelite‐Like Crystals

Donor Centers Involved into the Quantum Cutting in Ytterbium‐Doped Scheelite‐Like Crystals

2 μm emission properties and nonresonant energy transfer of Er3+ and Ho3+ codoped silicate glasses

Broadband 2μm fluorescence and energy transfer evaluation in Ho3+/Er3+ codoped germanosilicate glass

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