Near-infrared down-conversion in Mn2+–Yb3+ co-doped Zn2GeO4

Gao, Guojun; Wondraczek, Lothar

doi:10.1039/c3tc00803g

Cited by 106 publications

(57 citation statements)

References 55 publications

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“…It typically relies on a luminescence process where parts of the solar spectrum are converted to lower (downconversion, DC) 2 or higher (upconversion, UC) 3 photon energy. A net increase in conversion gain may then result from either an extension of the spectral response of the system (achievable by UC and DC) or from splitting high-energy photons into multiple photons of lower energy as long as the band-gap of the system can still be overcome (DC) [4][5][6][7] . UC and DC have been explored primarily for photovoltaic energy conversion where, ideally, the spectrum of incoming photons is matched to the band-gap of the employed semiconductor material.…”

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confidence: 99%

Solar spectral conversion for improving the photosynthetic activity in algae reactors

et al. 2013

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Sustainable biomass production is expected to be one of the major supporting pillars for future energy supply, as well as for renewable material provision. Algal beds represent an exciting resource for biomass/biofuel, fine chemicals and CO 2 storage. Similar to other solar energy harvesting techniques, the efficiency of algal photosynthesis depends on the spectral overlap between solar irradiation and chloroplast absorption. Here we demonstrate that spectral conversion can be employed to significantly improve biomass growth and oxygen production rate in closed-cycle algae reactors. For this purpose, we adapt a photoluminescent phosphor of the type Ca 0.59 Sr 0.40 Eu 0.01 S, which enables efficient conversion of the green part of the incoming spectrum into red light to better match the Q y peak of chlorophyll b. Integration of a Ca 0.59 Sr 0.40 Eu 0.01 S backlight converter into a flat panel algae reactor filled with Haematococcus pluvialis as a model species results in significantly increased photosynthetic activity and algae reproduction rate.

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Solar spectral conversion for improving the photosynthetic activity in algae reactors

et al. 2013

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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…”

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confidence: 99%

“…9(a) and (b). In this case, the energy transfer microscopic parameter (C DA ) from Er 3+ to Ho 3+ can be estimated using Forster’s spectral overlap model given by324041.…”

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confidence: 99%

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

Cao

Tian

et al. 2016

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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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Near-infrared down-conversion in Mn2+–Yb3+ co-doped Zn2GeO4

Cited by 106 publications

References 55 publications

Solar spectral conversion for improving the photosynthetic activity in algae reactors

Solar spectral conversion for improving the photosynthetic activity in algae reactors

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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