Open AccessExcitation Energy‐Transfer Processes in the Sensitization Luminescence of Europium in a Highly Luminescent Complex
Author(s) -
Huang YanJie,
Ke Can,
Fu LiMin,
Li Yu,
Wang ShuFeng,
Ma YingChao,
Zhang JanPing,
Wang Yuan
Publication year - 2019
Publication title -
chemistryopen
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 29
ISSN - 2191-1363
DOI - 10.1002/open.201900012
Subject(s) - luminescence , europium , excitation , chemistry , phosphorescence , photochemistry , singlet state , singlet oxygen , quantum yield , sensitization , fluorescence , materials science , atomic physics , excited state , optoelectronics , organic chemistry , oxygen , physics , optics , quantum mechanics , immunology , biology
The excitation energy transfer (EET) pathways in the sensitization luminescence of Eu III and the excitation energy migration between the different ligands in [Eu(fod) 3 dpbt] [where fod=6,6,7,7,8,8,8‐heptafluoro‐2,2‐dimethyl‐3,5‐octanedione and dpbt=2‐( N , N ‐diethylanilin‐4‐yl)‐4,6‐ bis (3,5‐dimethylpyrazol‐1‐yl)‐1,3,5‐triazine], exhibiting well‐separated fluorescence excitation and phosphorescence bands of the different ligands, were investigated by using time‐resolved luminescence spectroscopy for the first time. The data clearly revealed that upon the excitation of dpbt, the sensitization luminescence of Eu III in [Eu(fod) 3 dpbt] was dominated by the singlet EET pathway, whereas the triplet EET pathway involving T 1 (dpbt) was inefficient. The energy migration from T 1 (dpbt) to T 1 (fod) in [Eu(fod) 3 dpbt] was not observed. Moreover, upon the excitation of fod, a singlet EET pathway for the sensitization of Eu III luminescence, including the energy migration from S 1 (fod) to S 1 (dpbt) was revealed, in addition to the triplet EET pathway involving T 1 (fod). Under the excitation of dpbt at 410 nm, [Eu(fod) 3 dpbt] exhibited an absolute quantum yield for Eu III luminescence of 0.59 at 298 K. This work provides a solid and elegant example for the concept that singlet EET pathway could dominate the sensitization luminescence of Eu III in some complexes.