Broad and intense NIR luminescence from rare earth doped SiO2–Nb2O5 glass and glass ceramic prepared by a new sol gel route

Caixeta, Fábio José; Aquino, Felipe Thomaz; Pereira, R.; Gonçalves, Rogéria Rocha

doi:10.1016/j.jlumin.2015.08.054

Cited by 19 publications

(5 citation statements)

References 40 publications

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“…Whilst transition metal dopants can induce crystallisation in glass melts, the low doping concentrations in this study are below the thresholds observed in other studies [47,48]. [36,37].…”

Section: Discussioncontrasting

confidence: 68%

“…The Nb 2 O 5 and MoO 3 doped samples have an additional peak as labelled by • and ■ respectively. InFigure 4the Nb 2 O 5 doped sample displays an additional peak centered at 875cm -1 corresponding to NbO 6 octahedra[36,37], which have a higher Raman cross section relative to the glass matrix. [MoO 3 ] 2complexes in soda lime silicate glasses give rise to the peak at 925cm -1[38,39].…”

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confidence: 99%

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Optical and structural properties of d0 ion-doped silicate glasses for photovoltaic applications

Allsopp¹,

Christopoulou²,

Brookfield³

et al. 2018

Phys. Chem. Glasses: Eur. J. Glass Sci. Technol. B

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Optical and structural properties of float-type soda lime silicate (SLS) glasses doped with 0.2 mol % TiO 2 , ZrO 2 , HfO 2 , Nb 2 O 5 , Ta 2 O 5 , MoO 3 or WO 3 have been studied. Under UV excitation all d 0 doped glasses exhibit broadband visible emission centred between 19,000 cm-1 and 25,000 cm-1 (400nm-525nm) due to a transition from the 2p orbital of O 2to the metal d 0 orbital. Dopant additions lead to shifts in the UV absorption edge to lower energies, with doped glasses having an absorption edge 2,000 cm-1 (~20nm), and in the case of MoO 3, 4,000 cm-1 (~40nm), lower than the corresponding undoped glass. Combined UV-Vis absorption and X-band EPR spectroscopy analyses confirm that dopant cations occur in the studied glasses in the expected oxidation states of Ti 4+ , Zr 4+ , Hf 4+ , Nb 5+ , Ta 5+ , Mo 6+ and W 6+ , although very low levels of Mo 5+ are also observed, as demonstrated by the EPR resonance at g=1.92 (3.7T). The incorporation of the studied dopants into SLS glasses may find applications as cover glasses in photovoltaic (PV) applications, providing UV protection of polymers and solar cell materials in PV units whilst enhancing solar cell efficiency through downconversion / fluorescence of absorbed UV photons with re-emission as visible photons, available for absorption and conversion by the solar cell material.

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“…Whilst transition metal dopants can induce crystallisation in glass melts, the low doping concentrations in this study are below the thresholds observed in other studies [47,48]. [36,37].…”

Section: Discussioncontrasting

confidence: 68%

mentioning

confidence: 99%

Optical and structural properties of d0 ion-doped silicate glasses for photovoltaic applications

Allsopp¹,

Christopoulou²,

Brookfield³

et al. 2018

Phys. Chem. Glasses: Eur. J. Glass Sci. Technol. B

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“…• and ■ respectively. concentrations in SLS glasses [263,264]. The additional bands from NbO6 octahedra are 152 also present in both the Al2O3 and ZnO co-doped sample Raman spectra, shown in Figure 58 and Figure 59 respectively.…”

Section: Raman Spectroscopymentioning

confidence: 88%

“…[NbO6] octahedra have high Raman cross sections and the peak at 875 cm -1 is detectable at low (>0.10mol%) concentrations in SLS glasses [263,264] and is present in Figure 57, Figure 58 and Figure 59. Deconvolution of Nb2O5 spectra along with base SLS through the program FitYK shown in Figure 61, give a BO:NBO ratio of circa 64:36 indicating high polymerisation and non-significant changes to the polymerisation with the incorporation of 0.20mol% Nb2O5 and are consistent with other similar glasses [262].…”

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confidence: 99%

Effects of d0 and s2 cations on optical properties of silicate glasses

Allsopp¹

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In partial fulfilment of its requirements for The Degree of Doctor of Philosophy 2 Declaration I hereby declare, that the thesis entitled 'Effects of d 0 and s 2 cations on optical properties of silicate glasses' is a result of my original work and investigation. None of the results presented in the manuscript have been lifted from any other sources and legitimate references are presented where necessary. Name:Signature:The copyright of this thesis rests with the author and no quotations from it or information derived from it may be published without prior written consent of the author. 3 Published work and conferences Aspects of the work described in the thesis were published in:• Optical and structural properties of d 0 ion doped silicate glasses for photovoltaic applications. B.

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“…Nb2O5 ortorrômbica (JCPDS 01-071-0336) indica o início de sua cristalização. A formação de uma estrutura vitrocerâmica, além de visto no difratograma pode ser observado nas micrografias pela formação de uma nanocompósito com a presença de cristais de Nb2O5 esféricos na rede hospedeira amorfa de SiO2(CAIXETA et al, 2016b).…”

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Materiais à base de GeO2 e Nb2O5 dopados com íons terras raras: estudo da emissão de luz branca à luminescência na região do infravermelho

Souza¹

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parte das exigências para a obtenção do título de Mestre em Ciências, Área: Química. Ribeirão Preto -SPAutorizo a reprodução e divulgação total ou parcial deste trabalho, por qualquer meio convencional ou eletrônico, para fins de estudo e pesquisa, desde que citada a fonte. FICHA CATALOGRÁFICA SOUZA, Vítor dos Santos deMateriais à base de GeO2 e Nb2O5 dopados com íons terras raras: Estudo da emissão de luz branca à luminescência na região do infravermelho.

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Broad and intense NIR luminescence from rare earth doped SiO2–Nb2O5 glass and glass ceramic prepared by a new sol gel route

Cited by 19 publications

References 40 publications

Optical and structural properties of d0 ion-doped silicate glasses for photovoltaic applications

Optical and structural properties of d0 ion-doped silicate glasses for photovoltaic applications

Effects of d0 and s2 cations on optical properties of silicate glasses

Materiais à base de GeO2 e Nb2O5 dopados com íons terras raras: estudo da emissão de luz branca à luminescência na região do infravermelho

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