Optimizing infrared to near infrared upconversion quantum yield of β-NaYF4:Er3+ in fluoropolymer matrix for photovoltaic devices

Ivaturi, Aruna; MacDougall, Sean K. W.; Martín-Rodríguez, Rosa; Quintanilla, Marta; Marques-Hueso, Jose; Krämer, Karl; Meijerink, Andries; Richards, Bryce S. (2013). Optimizing infrared to near infrared upconversion quantum yield of β-NaYF4:Er3+ in fluoropolymer matrix for photovoltaic devices. Journal of applied physics, 114(1), 013505. Melville, N.Y.: American Institute of Physics 10.1063/1.4812578

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The present study reports for the first time the optimization of the infrared (1523 nm) to near-infrared (980 nm) upconversion quantum yield (UC-QY) of hexagonal trivalent erbium doped sodium yttrium fluoride (β-NaYF4:Er3+) in a perfluorocyclobutane (PFCB) host matrix under monochromatic excitation. Maximum internal and external UC-QYs of 8.4% ± 0.8% and 6.5% ± 0.7%, respectively, have been achieved for 1523 nm excitation of 970 ± 43 Wm−2 for an optimum Er3+ concentration of 25 mol% and a phosphor concentration of 84.9 w/w% in the matrix. These results correspond to normalized internal and external efficiencies of 0.86 ± 0.12 cm2 W−1 and 0.67 ± 0.10 cm2 W−1, respectively. These are the highest values ever reported for β-NaYF4:Er3+ under monochromatic excitation. The special characteristics of both the UC phosphor β-NaYF4:Er3+ and the PFCB matrix give rise to this outstanding property. Detailed power and time dependent luminescence measurements reveal energy transfer upconversion as the dominant UC mechanism.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Krämer, Karl

Subjects:

500 Science > 530 Physics
500 Science > 540 Chemistry

ISSN:

0021-8979

Publisher:

American Institute of Physics

Language:

English

Submitter:

Karl Krämer

Date Deposited:

16 Dec 2013 16:33

Last Modified:

12 Nov 2019 14:22

Publisher DOI:

10.1063/1.4812578

BORIS DOI:

10.7892/boris.39109

URI:

https://boris.unibe.ch/id/eprint/39109

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