Frequency converter layers based on terbium and ytterbium activated HfO 2 glass-ceramics

Alombert-Goget, G.; Armellini, Cristina; Chiappini, Andrea; Chiasera, Alessandro; Ferrari, M.; Berneschi, Simone; Brenci, M.; Pelli, S.; Righini, Giancarlo C.; Bregoli, M.; Maglione, A.; Pucker, G.; Speranza, G.

doi:10.1117/12.855025

Cited by 10 publications

(5 citation statements)

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“…Two series of 70SiO 2 -30HfO 2 samples activated by different molar concentrations of terbium and ytterbium ions were prepared by sol-gel route using the dip-coating technique, keeping constant the rate [Yb]/[Tb] = 4, following the experimental procedure described in [18,19]. Silica-hafnia films were deposited on cleaned pure SiO 2 substrates and the final films, obtained after 20 dips, were stabilized by a treatment of 5 min in air at 900°C.…”

Section: Methodsmentioning

confidence: 99%

“…Previous studies on 70SiO 2 -30HfO 2 downconverting waveguides [18,19] showed a transfer efficiency as high as 38% for glass-ceramic films activated by the maximum rare earth amount: 1% of terbium and 4% of ytterbium ([Yb + Tb] = 5%). These studies reported also that for a given concentration of donors (Tb 3+ ), increasing the number of acceptors (Yb 3+ ) located close to the Tb 3+ ion can have detrimental effects due to concentration quenching.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper we focus on a quantum cutting mechanism which can produce two 980 nm photons from one 488 nm photon [18,19]. This process is based on a cooperative energy transfer mechanism between one Tb 3+ and two Yb 3+ rare earth ions.…”

Section: Introductionmentioning

confidence: 99%

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Tb3+/Yb3+ codoped silica–hafnia glass and glass–ceramic waveguides to improve the efficiency of photovoltaic solar cells

et al. 2016

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In this paper we present the investigation of the energy transfer efficiency between Tb3+ and Yb3+ ions in silica-hafnia waveguides. Cooperative energy transfer between these two ions allows to cut one 488 nm photon in two 980 nm photons and could have important applications in improving the performance of photovoltaic solar cells. Previous works revealed that for a given concentration of donors (Tb3+, increasing the number of acceptors (Yb3+) located near to the Tb3+ ion can increase the Tb-Yb transfer probability. However, when increasing the density of active ions, some detrimental effects due to cross-relaxation mechanisms become relevant. On the basis of this observation the sample doping was chosen keeping constant the molar ratio [Yb]/[Tb] = 4 and the total rare earths contents were [Tb + Yb]/[Si + Hf] = 5%, 7%, 9%. The choice of the matrix is another crucial point to obtain an efficient down conversion processes with rare earth ions. To this respect a 70SiO(2)-30HfO(2) waveguide composition was chosen. The comparison between the glass and the glass-ceramic structures demonstrated that the latter is more efficient since it combines the good optical properties of glasses with the optimal spectroscopic properties of crystals activated by luminescent species. A maximum transfer efficiency of 55% was found for the highest rare earth doping concentration

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tb3+/Yb3+ codoped silica–hafnia glass and glass–ceramic waveguides to improve the efficiency of photovoltaic solar cells

et al. 2016

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“…In this section we will remind some results obtained in oxide and fluoride glasses and glass ceramics. The role of silica-hafnia system waveguides has been discussed in recent papers [II,13]. In these articles the authors have demonstrated that some glasses (G) and transparent glass ceramics (GCs) could be alternative systems for supporting an effective quantum cutting process.…”

Section: Glass and Glass Ceramics Hosting Re Ions For Down Convermentioning

confidence: 99%

“…Measurements were performed in waveguide contiguration. [II,12] The decay curves of the 5 D4 state are reported in Fig. 5.…”

Section: Wavelength [Nm]mentioning

confidence: 99%

Rare earths and metal nanoparticles in silicate glass-ceramics to improve the efficiency of photovoltaic solar cells

Bouajaj

Belmokhtar

Britel

et al. 2014

2014 International Renewable and Sustainable Energy Conference (IRSEC)

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The efficiency of solar cells may be improved by better exploitation of the solar radiation managing the photons coming from the solar spectrum to better fit the absorption band of the employed solar cells. This can be done by inserting in the front or rear of the solar cell an optically active layer doped with rare earth ions which acts as down-converter or up-converter. This is just one of the possibilities that involve several structures and geometries such as waveguide configuration and radiation trapping systems. Moreover, the use of antenna systems or other sensitizers can improve significantly the optical performance of the down converting layer. In this work we will give a short review regarding the research already developed by the team in the field of down-conversion process and rare earth sensitizing.On the one hand we will focus the attention on the cooperative energy transfer between donor and acceptor ions taking as example the interaction among one Tb 3+ ion and two Yb 3+ ions in a 70Si02-30Hf02 glass-ceramic waveguide and the Pr 3+ to Yb 3+ energy transfer in bulk fluoride glasses. On the other hand we will show how silver nanoparticles can enhance the absorption efficiency of rare earths.

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Glass ceramics for frequency conversion

Chiappini

Żur

Enrichi

et al. 2020

Solar Cells and Light Management

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Frequency converter layers based on terbium and ytterbium activated HfO 2 glass-ceramics

Cited by 10 publications

References 0 publications

Tb3+/Yb3+ codoped silica–hafnia glass and glass–ceramic waveguides to improve the efficiency of photovoltaic solar cells

Tb3+/Yb3+ codoped silica–hafnia glass and glass–ceramic waveguides to improve the efficiency of photovoltaic solar cells

Rare earths and metal nanoparticles in silicate glass-ceramics to improve the efficiency of photovoltaic solar cells

Glass ceramics for frequency conversion

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