M. S. Meijer, P. A. Rojas-Gutierrez, D. Busko, I. A. Howard, Florian Frenzel, Christian Würth, Ute Resch-Genger, B. S. Richards, A. Turshatov, J. A. Capobianco, S. Bonnet
- The upconversion quantum yield (QY) is an essential parameter for the characterization of the optical performance of lanthanoid-doped upconverting nanoparticles (UCNPs). Despite its nonlinear dependence on excitation power density, it is typically reported only as a single number. Here, we present the first measurement of absolute upconversion quantum yields of the individual emission bands of blue light-emitting LiYF4:Yb3+,Tm3+ UCNPs in toluene. Reporting the quantum yields for the individual emission bands is required for assessing the usability of UCNPs in various applications that require upconverted light of different wavelengths, such as bioimaging, photocatalysis and phototherapy.
Here, the reliability of the QY measurements is demonstrated by studying the same batch of UCNPs in three different research groups. The results show that whereas the total upconversion quantum yield of these UCNPs is quite high - typically 0.02 at a power density of 5 W/cm2 — most of the upconvertedThe upconversion quantum yield (QY) is an essential parameter for the characterization of the optical performance of lanthanoid-doped upconverting nanoparticles (UCNPs). Despite its nonlinear dependence on excitation power density, it is typically reported only as a single number. Here, we present the first measurement of absolute upconversion quantum yields of the individual emission bands of blue light-emitting LiYF4:Yb3+,Tm3+ UCNPs in toluene. Reporting the quantum yields for the individual emission bands is required for assessing the usability of UCNPs in various applications that require upconverted light of different wavelengths, such as bioimaging, photocatalysis and phototherapy.
Here, the reliability of the QY measurements is demonstrated by studying the same batch of UCNPs in three different research groups. The results show that whereas the total upconversion quantum yield of these UCNPs is quite high - typically 0.02 at a power density of 5 W/cm2 — most of the upconverted photon flux is emitted in the 794 nm upconversion band, while the blue emission band at 480 nm is very weak, with a much lower quantum yield of 6 times 10^5 at 5 W/cm2. Overall, although the total upconversion quantum yield of LiYF4:Yb3+,Tm3+ UCNPs seems satisfying, notably for NIR bioimaging, blue-light demanding phototherapy applications will require better-performing UCNPs with higher blue light
upconversion quantum yields.…
MetadatenAutor*innen: | M. S. Meijer, P. A. Rojas-Gutierrez, D. Busko, I. A. Howard, Florian FrenzelORCiD, Christian WürthORCiD, Ute Resch-GengerORCiD, B. S. Richards, A. Turshatov, J. A. Capobianco, S. Bonnet |
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Dokumenttyp: | Zeitschriftenartikel |
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Veröffentlichungsform: | Verlagsliteratur |
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Sprache: | Englisch |
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Titel des übergeordneten Werkes (Englisch): | Physical chemistry, chemical physics : PCCP |
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Jahr der Erstveröffentlichung: | 2018 |
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Organisationseinheit der BAM: | 1 Analytische Chemie; Referenzmaterialien |
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| 1 Analytische Chemie; Referenzmaterialien / 1.2 Biophotonik |
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Verlag: | Royal Society of Chemistry |
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Jahrgang/Band: | 20 |
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Ausgabe/Heft: | 35 |
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Erste Seite: | 22556 |
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Letzte Seite: | 22562 |
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DDC-Klassifikation: | Naturwissenschaften und Mathematik / Chemie / Analytische Chemie |
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| Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten |
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Freie Schlagwörter: | Core-shell nanoparticles; Lanthanide-doped nayf-4; Nanocrystals; Near-infrared light; Photocatalytic activity; Photosensitizer; Upconverting nanoparticles |
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Themenfelder/Aktivitätsfelder der BAM: | Chemie und Prozesstechnik |
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| Material |
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DOI: | 10.1039/c8cp03935f |
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Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
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Datum der Freischaltung: | 25.10.2018 |
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Referierte Publikation: | Ja |
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Datum der Eintragung als referierte Publikation: | 25.10.2018 |
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