LiYF4:Yb/LiYF4 and LiYF4:Yb,Er/LiYF4 core/shell nanocrystals with luminescence decay times similar to YLF laser crystals and the upconversion quantum yield of the Yb,Er doped nanocrystals
DC Element | Wert | Sprache |
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dc.contributor.author | Carl, Frederike | |
dc.contributor.author | Birk, Leonie | |
dc.contributor.author | Grauel, Bettina | |
dc.contributor.author | Pons, Monica | |
dc.contributor.author | Wuerth, Christian | |
dc.contributor.author | Resch-Genger, Ute | |
dc.contributor.author | Haase, Markus | |
dc.date.accessioned | 2021-12-23T16:07:25Z | - |
dc.date.available | 2021-12-23T16:07:25Z | - |
dc.date.issued | 2021 | |
dc.identifier.issn | 19980124 | |
dc.identifier.uri | https://osnascholar.ub.uni-osnabrueck.de/handle/unios/7868 | - |
dc.description.abstract | We developed a procedure to prepare luminescent LiYF4:Yb/LiYF(4)and LiYF4:Yb,Er/LiYF(4)core/shell nanocrystals with a size of approximately 40 nm revealing luminescence decay times of the dopant ions that approach those of high-quality laser crystals of LiYF4:Yb (Yb:YLF) and LiYF4:Yb,Er (Yb,Er:YLF) with identical doping concentrations. As the luminescence decay times of Yb(3+)and Er(3+)are known to be very sensitive to the presence of quenchers, the long decay times of the core/shell nanocrystals indicate a very low number of defects in the core particles and at the core/shell interfaces. This improvement in the performance was achieved by introducing two important modifications in the commonly used oleic acid based synthesis. First, the shell was prepared via a newly developed method characterized by a very low nucleation rate for particles of pure LiYF(4)shell material. Second, anhydrous acetates were used as precursors and additional drying steps were applied to reduce the incorporation of OH(-)in the crystal lattice, known to quench the emission of Yb(3+)ions. Excitation power density (P)-dependent absolute measurements of the upconversion luminescence quantum yield (phi(UC)) of LiYF4:Yb,Er/LiYF(4)core/shell particles reveal a maximum value of 1.25% atPof 180 Wcm(-2). Although lower than the values reported for NaYF4:18%Yb,2%Er core/shell nanocrystals with comparable sizes, these phi(UC)values are the highest reported so far for LiYF4:18%Yb,2%Er/LiYF(4)nanocrystals without additional dopants. Further improvements may nevertheless be possible by optimizing the dopant concentrations in the LiYF(4)nanocrystals. | |
dc.description.sponsorship | German Science Foundation DFGGerman Research Foundation (DFG) [RE 1203/18-1, HA 1649/7-1]; We thank the German Science Foundation DFG for financial support (grants RE 1203/18-1 and HA 1649/7-1). | |
dc.language.iso | en | |
dc.publisher | TSINGHUA UNIV PRESS | |
dc.relation.ispartof | NANO RESEARCH | |
dc.subject | 1053 NM | |
dc.subject | Chemistry | |
dc.subject | Chemistry, Physical | |
dc.subject | decay time | |
dc.subject | DIODE | |
dc.subject | EFFICIENT CONTINUOUS-WAVE | |
dc.subject | ENERGY-TRANSFER | |
dc.subject | FACILE SYNTHESIS | |
dc.subject | FLUORIDE SCHEELITES | |
dc.subject | LATTICE-DYNAMICS | |
dc.subject | LiYF4 | |
dc.subject | luminescence | |
dc.subject | Materials Science | |
dc.subject | Materials Science, Multidisciplinary | |
dc.subject | MODE-LOCKING | |
dc.subject | nanocrystal | |
dc.subject | Nanoscience & Nanotechnology | |
dc.subject | PHASE-EQUILIBRIA | |
dc.subject | Physics | |
dc.subject | Physics, Applied | |
dc.subject | quantum yield | |
dc.subject | REPETITION-RATE | |
dc.subject | Science & Technology - Other Topics | |
dc.subject | upconversion | |
dc.title | LiYF4:Yb/LiYF4 and LiYF4:Yb,Er/LiYF4 core/shell nanocrystals with luminescence decay times similar to YLF laser crystals and the upconversion quantum yield of the Yb,Er doped nanocrystals | |
dc.type | journal article | |
dc.identifier.doi | 10.1007/s12274-020-3116-y | |
dc.identifier.isi | ISI:000579295100001 | |
dc.description.volume | 14 | |
dc.description.issue | 3 | |
dc.description.startpage | 797 | |
dc.description.endpage | 806 | |
dc.contributor.orcid | 0000-0002-0944-1115 | |
dc.contributor.orcid | 0000-0002-0204-9727 | |
dc.contributor.orcid | 0000-0002-9686-8810 | |
dc.contributor.researcherid | B-8369-2009 | |
dc.contributor.researcherid | A-9736-2013 | |
dc.identifier.eissn | 19980000 | |
dc.publisher.place | B605D, XUE YAN BUILDING, BEIJING, 100084, PEOPLES R CHINA | |
dcterms.isPartOf.abbreviation | Nano Res. | |
dcterms.oaStatus | hybrid | |
crisitem.author.dept | Institut für Chemie neuer Materialien | - |
crisitem.author.deptid | institute11 | - |
crisitem.author.orcid | 0000-0002-9686-8810 | - |
crisitem.author.parentorg | FB 05 - Biologie/Chemie | - |
crisitem.author.grandparentorg | Universität Osnabrück | - |
crisitem.author.netid | HaMa954 | - |
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geprüft am 07.06.2024