title: Listening to lanthanide complexes: determination of the intrinsic luminescence quantum yield by nonradiative relaxation.
abstract: The photophysical properties of lanthanide complexes have been studied extensively; however, fundamental parameters such as the intrinsic quantum yield as well as radiative and nonradiative decay rates are difficult or even impossible to measure experimentally. Herein, a photoacoustic (PA) method is proposed to determine the intrinsic quantum yield of lanthanide complexes with lifetimes in the order of milliseconds. This method is used to determine the intrinsic quantum yields for europium(III)-containing metallomesogens as well as terbium(III) complexes. The results show that the PA signal is sensitive to both the lifetime and the ratio of the fast-to-slow heat component of the samples. It is found that there is an efficient ligand sensitization and a moderate intrinsic quantum yield for the complexes. The intrinsic quantum yield of Eu(3+) in the metallomesogens exhibits an obvious increase upon the isotropic liquid to smectic A transition. The proposed PA method is quite simple, and can contribute to a clearer understanding of the photophysical processes in luminescent lanthanide complexes.
authors.affiliation: Key Laboratory of Modern Acoustics, Ministry of Education, Institute of Acoustics, Nanjing University, Nanjing 210093, China.
authors.forename: Yuetao
authors.initials: Y
authors.lastname: Yang
authors.forename: Junjia
authors.initials: J
authors.lastname: Li
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Liu
authors.forename: Shuyi
authors.initials: S
authors.lastname: Zhang
authors.forename: Kris
authors.initials: K
authors.lastname: Driesen
authors.forename: Peter
authors.initials: P
authors.lastname: Nockemann
authors.forename: Koen
authors.initials: K
authors.lastname: Binnemans
mesh_terms: D028581:Lanthanoid Series Elements / Q000737:chemistry*; D008024:Ligands; D049449:Luminescence; D009942:Organometallic Compounds / Q000737:chemistry*; D010777:Photochemistry; D011789:Quantum Theory
chemical_list: D028581:Lanthanoid Series Elements; D008024:Ligands; D009942:Organometallic Compounds