Down-conversion process in Tb3+–Yb3+ co-doped Calibo glasses

Terra, Idelma A. A.; Borrero-González, L. J.; Figueredo, Tamires Rocha; Almeida, Juliana M. P.; Hernandes, Antônio Carlos; Nunes, Lorena Andrade; Malta, O.L.

doi:10.1016/j.jlumin.2012.02.019

Cited by 59 publications

(29 citation statements)

References 22 publications

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“…[244][245][246][247][248][249] Some researchers believed that a nonlinear second-order downconversion process should be responsible for the cooperative quantum-cutting (Fig. 14a).…”

Section: Narrowband Quantum-cutting For C-si Solar Cellsmentioning

confidence: 99%

Enhancing solar cell efficiency: the search for luminescent materials as spectral converters

et al. 2013

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Photovoltaic (PV) technologies for solar energy conversion represent promising routes to green and renewable energy generation. Despite relevant PV technologies being available for more than half a century, the production of solar energy remains costly, largely owing to low power conversion efficiencies of solar cells. The main difficulty in improving the efficiency of PV energy conversion lies in the spectral mismatch between the energy distribution of photons in the incident solar spectrum and the bandgap of a semiconductor material. In recent years, luminescent materials, which are capable of converting a broad spectrum of light into photons of a particular wavelength, have been synthesized and used to minimize the losses in the solar-cell-based energy conversion process. In this review, we will survey recent progress in the development of spectral converters, with a particular emphasis on lanthanide-based upconversion, quantum-cutting and down-shifting materials, for PV applications. In addition, we will also present technical challenges that arise in developing cost-effective high-performance solar cells based on these luminescent materials.

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“…[244][245][246][247][248][249] Some researchers believed that a nonlinear second-order downconversion process should be responsible for the cooperative quantum-cutting (Fig. 14a).…”

Section: Narrowband Quantum-cutting For C-si Solar Cellsmentioning

confidence: 99%

Enhancing solar cell efficiency: the search for luminescent materials as spectral converters

et al. 2013

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“…The absorbed high energy photons are converted to low energy photons by means of the downconversion (DC) mechanism, where one visible photon is transformed into two photons in the infrared spectral region with maximum answer to the solar cell. There has been extensive investigation of DC processes involving crossrelaxation (CR) [5][6][7][8][9][10][11]. Rare earth-doped TeO 2 -based systems are promising materials for optical applications including optical fibers, solid state lasers, waveguides, optical amplifiers, optical modulators, optical temperature sensor and frequency doubling [12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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

Figueiredo

Santos

Yukimitu

et al. 2015

Journal of Luminescence

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“…The slopes of the straight lines are indicated by n = 1.104, 1.039, and 1.14, corresponding to emissions centered at 1200 nm, 1530 nm, and 1630 nm, respectively. These processes involve one-photon energy transfer [50]. In this work, the saturation has not appeared at up to 100 mW for the three kinds of dopants.…”

Section: Resultsmentioning

confidence: 70%

Multispectral Emissions of Lanthanide-Doped Gadolinium Oxide Nanophosphors for Cathodoluminescence and Near-Infrared Upconversion/Downconversion Imaging

et al. 2016

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Comprehensive imaging of a biological individual can be achieved by utilizing the variation in spatial resolution, the scale of cathodoluminescence (CL), and near-infrared (NIR), as favored by imaging probe Gd2O3 co-doped lanthanide nanophosphors (NPPs). A series of Gd2O3:Ln3+/Yb3+ (Ln3+: Tm3+, Ho3+, Er3+) NPPs with multispectral emission are prepared by the sol-gel method. The NPPs show a wide range of emissions spanning from the visible to the NIR region under 980 nm excitation. The dependence of the upconverting (UC)/downconverting (DC) emission intensity on the dopant ratio is investigated. The optimum ratios of dopants obtained for emissions in the NIR regions at 810 nm, 1200 nm, and 1530 nm are applied to produce nanoparticles by the homogeneous precipitation (HP) method. The nanoparticles produced from the HP method are used to investigate the dual NIR and CL imaging modalities. The results indicate the possibility of using Gd2O3 co-doped Ln3+/Yb3+ (Ln3+: Tm3+, Ho3+, Er3+) in correlation with NIR and CL imaging. The use of Gd2O3 promises an extension of the object dimension to the whole-body level by employing magnetic resonance imaging (MRI).

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Down-conversion process in Tb3+–Yb3+ co-doped Calibo glasses

Cited by 59 publications

References 22 publications

Enhancing solar cell efficiency: the search for luminescent materials as spectral converters

Enhancing solar cell efficiency: the search for luminescent materials as spectral converters

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

Multispectral Emissions of Lanthanide-Doped Gadolinium Oxide Nanophosphors for Cathodoluminescence and Near-Infrared Upconversion/Downconversion Imaging

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