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Rare-earth coordination polymers with multimodal luminescence on the nano-, micro-, and milli-second time scales

Jakoby, Marius 1; Beil, Carolin; Nazari, Pariya 1; Richards, Bryce S. ORCID iD icon 1,2; Seitz, Michael; Turshatov, Andrey 1; Howard, Ian A. 1,2
1 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)
2 Lichttechnisches Institut (LTI), Karlsruher Institut für Technologie (KIT)

We present a coordination polymer based on rare-earth metal centers and carboxylated 4,4′-diphenyl-2,2′-bipyridine ligands. We investigate Y$^{3+}$, Lu$^{3+}$, Eu$^{3+}$, and a statistical mixture of Y$^{3+}$ with Eu$^{3+}$ as metal centers. When Y$^{3+}$ or Lu$^{3+}$ is exclusively present in the coordination polymer, biluminescence from the ligand is observed: violet emission from the singlet state (417 nm, 0.9 ns lifetime) and orange emission from the triplet state (585 nm, 76 ms (Y$^{3+}$) and 31 ms (Lu$^{3+}$)). When Eu$^{3+}$ is present in a statistical mixture with Y$^{3+}$, red emission from the Eu$^{3+}$ (611 nm, ∼500μs) is observed in addition to the ligand emissions. We demonstrate that this multi-mode emission is enabled by the immobility of singlet and triplet states on the ligand. Eu$^{3+}$ only receives energy from adjacent ligands. Meanwhile, in the broad inhomogeneous distribution of ligand energies, higher energy states favor singlet emission, whereas faster intersystem crossing in the more stabilized ligands enhances their contribution to triplet emission.

Verlagsausgabe §
DOI: 10.5445/IR/1000130171
Veröffentlicht am 23.04.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Universität Karlsruhe (TH) – Interfakultative Einrichtungen (Interfakultative Einrichtungen)
Karlsruhe School of Optics & Photonics (KSOP)
Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2589-0042
KITopen-ID: 1000130171
HGF-Programm 38.01.05 (POF IV, LK 01) Simulations, Theory, Optics and Analytics (STOA)
Erschienen in iScience
Verlag Cell Press
Band 24
Heft 3
Seiten Art. Nr.: 102207
Vorab online veröffentlicht am 22.02.2021
Nachgewiesen in Web of Science
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