Determination of the refractive index of BaY<inf>2</inf>F<inf>8</inf>:Er<sup>3+</sup> (0.5 mol% to 30 mol%) in the 300 nm–1800 nm range by ellipsometry; a record-breaking upconversion material

Gibbons, J; Jones, CMS; Bennett, NS; Marques-Hueso, J

Determination of the refractive index of BaY<inf>2</inf>F<inf>8</inf>:Er<sup>3+</sup> (0.5 mol% to 30 mol%) in the 300 nm–1800 nm range by ellipsometry; a record-breaking upconversion material

Gibbons, J Jones, CMS Bennett, NS Marques-Hueso, J

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Publisher:: Elsevier BV
Publication Type:: Journal Article
Citation:: Journal of Luminescence, 2021, 230, pp. 117639-117639
Issue Date:: 2021-02-01

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Field	Value	Language
dc.contributor.author	Gibbons, J
dc.contributor.author	Jones, CMS
dc.contributor.author	Bennett, NS
dc.contributor.author	Marques-Hueso, J
dc.date.accessioned	2020-11-17T04:52:07Z
dc.date.available	2021-03-22T18:03:11Z
dc.date.issued	2021-02-01
dc.identifier.citation	Journal of Luminescence, 2021, 230, pp. 117639-117639
dc.identifier.issn	0022-2313
dc.identifier.uri	http://hdl.handle.net/10453/144094
dc.description.abstract	© 2020 The Author(s) This work reports the ellipsometric study of trivalent erbium (Er3+) doped monocrystalline barium yttrium fluoride (BaY2F8), which has recently been shown to be one of the best photon upconversion (UC) materials available. This spans the BaY2F8 applications in a large range of wavelengths, from ultraviolet (UV) to near-infrared (NIR). We detail the optical properties of BaY2F8: Er3+ (0.5 mol%, 10 mol%, and 30 mol%), measured via variable angle spectroscopic ellipsometry over a spectral range from 300 nm to 1800 nm, reporting for the first time the indices of refraction for BaY2F8:Er3+. The upconversion external photoluminescence quantum yield (ePLQY) of the BaY2F8:Er3+ samples have also been studied by exciting at [JG]λ=1588nmλ=1493 nm. The highest ePLQY of BaY2F8 was found for the largest dopant concentration 30 mol% Er3+ reaching the value of [JG]1.07% ± 0.12%, at an irradiance of 9.512 ×10−2W/cm23.62% ± 0.01%, at an irradiance of (6.23 ± 0.45) ×10−2 W/cm2. The refractive index (λ= 589.3 nm) was determined to be 1.4808± 0.014 for 0.5 mol%, 1.4980± 0.003 for 10 mol%, and 1.5022± 0.006 for 30 mol%. Increasing Er3+ doping concentration increased the refractive index. All samples decreased monotonically with increasing wavelength. The Brewster angle of BaY2F8:Er3+ is observed to be ≈ 56∘, whilst the Abbe number of the samples was found to be as high as 124.62. These findings provide valuable insight into the optical properties of BaY2F8:Er3+ in the wide range of frequencies that is has proven useful.
dc.language	en
dc.publisher	Elsevier BV
dc.relation.ispartof	Journal of Luminescence
dc.relation.isbasedon	10.1016/j.jlumin.2020.117639
dc.rights	Elsevier required licence: © 2021 . This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The definitive publisher version is available online at https://doi.org/10.1016/j.jlumin.2020.117639	en_US
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0205 Optical Physics, 0306 Physical Chemistry (incl. Structural)
dc.subject.classification	Applied Physics
dc.title	Determination of the refractive index of BaY<inf>2</inf>F<inf>8</inf>:Er<sup>3+</sup> (0.5 mol% to 30 mol%) in the 300 nm–1800 nm range by ellipsometry; a record-breaking upconversion material
dc.type	Journal Article
utslib.citation.volume	230
utslib.for	0205 Optical Physics
utslib.for	0306 Physical Chemistry (incl. Structural)
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	open_access	*
dc.date.updated	2020-11-17T04:51:59Z
pubs.publication-status	Accepted
pubs.volume	230

Abstract:

© 2020 The Author(s) This work reports the ellipsometric study of trivalent erbium (Er3+) doped monocrystalline barium yttrium fluoride (BaY2F8), which has recently been shown to be one of the best photon upconversion (UC) materials available. This spans the BaY2F8 applications in a large range of wavelengths, from ultraviolet (UV) to near-infrared (NIR). We detail the optical properties of BaY2F8: Er3+ (0.5 mol%, 10 mol%, and 30 mol%), measured via variable angle spectroscopic ellipsometry over a spectral range from 300 nm to 1800 nm, reporting for the first time the indices of refraction for BaY2F8:Er3+. The upconversion external photoluminescence quantum yield (ePLQY) of the BaY2F8:Er3+ samples have also been studied by exciting at [JG]λ=1588nmλ=1493 nm. The highest ePLQY of BaY2F8 was found for the largest dopant concentration 30 mol% Er3+ reaching the value of [JG]1.07% ± 0.12%, at an irradiance of 9.512 ×10−2W/cm23.62% ± 0.01%, at an irradiance of (6.23 ± 0.45) ×10−2 W/cm2. The refractive index (λ= 589.3 nm) was determined to be 1.4808± 0.014 for 0.5 mol%, 1.4980± 0.003 for 10 mol%, and 1.5022± 0.006 for 30 mol%. Increasing Er3+ doping concentration increased the refractive index. All samples decreased monotonically with increasing wavelength. The Brewster angle of BaY2F8:Er3+ is observed to be ≈ 56∘, whilst the Abbe number of the samples was found to be as high as 124.62. These findings provide valuable insight into the optical properties of BaY2F8:Er3+ in the wide range of frequencies that is has proven useful.

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