Dual Energy Transfer Pathways from an Antenna Ligand to Lanthanide Ion in Trivalent Europium Complexes with Phosphine-Oxide Bridges

Shiori Miyazaki, Kiyoshi Miyata, Haruna Sakamoto, Fumiya Suzue, Yuichi Kitagawa, Yasuchika Hasegawa, Ken Onda

Research output: Contribution to journalArticle

Abstract

Trivalent europium (Eu3+) complexes are attractive materials for luminescence applications if energy transfer from antenna ligands to the lanthanide ion is efficient. However, the microscopic mechanisms of the transfer remain elusive, and fundamental physical chemistry questions still require answers. We track the energy transfer processes in a luminescent complex Eu(hfa)3(DPPTO)2 (hfa, hexafluoroacetylacetonate; DPPTO, 2-diphenylphosphoryltriphenylene) using time-resolved photoluminescence spectroscopy. In addition to the conventional energy transfer pathway through the T1 state of the ligands, we discovered ultrafast energy transfer pathway directly from the singlet excited states of the ligands to the 5D1 state of Eu3+. The short time scale of the energy transfer (3 ns, 200 ns) results in its high photoluminescence quantum yield. The discovery of the distinct energy transfer pathways from a single chromophore is important for establishing design strategies of luminescent complexes.

Original languageEnglish
Pages (from-to)6601-6606
Number of pages6
JournalJournal of Physical Chemistry A
Volume124
Issue number33
DOIs
Publication statusPublished - Aug 20 2020

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

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