High yield luminescence of a novel europium complex by excimer excitation and f–f absorption of Eu3+

“…This ff emission sensitization mechanism is known as the photo-antenna effect. However, a suitable excitation wavelength for the energy acceptor level for Ln 3+ , which shows emission in the visible light region, is mostly in the UV region, and there are very few reports on Ln complexes showing visible-light excitation and visible-light luminescence ( Werts et al, 1999 ; Yang et al, 2004 ; Deun et al, 2005 ; Zhang et al, 2005 ; An et al, 2008 ; Chen et al, 2008 ; Andreiadis et al, 2009 ; He et al, 2009 ; Divya et al, 2010 ; He et al, 2010 ; Gu and Yan, 2013 ; Zhang et al, 2013 ; Sun et al, 2014 ; Xu et al, 2014 ; Aquino et al, 2021 ; Zhang et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Thermosensitive visible-light-excited visible-/NIR-luminescent complexes with lanthanide sensitized by the π-electronic system through intramolecular H-bonding

et al. 2022

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Visible-luminescent lanthanide (LnL) complexes with a highly planar tetradentate ligand were successfully developed for a visible-light solid-state excitation system. L was designed by using two 2-hydroxy-3-(2-pyridinyl)-benzaldehyde molecules bridged by ethylenediamine, which was then coordinated to a series of Ln ions (Ln = Nd, Sm, Eu, Gd, Tb, Dy, and Yb). From the measurement of single-crystal X-ray analysis of EuL, two phenolic O atoms and two imine N atoms in L were coordinated to the Eu ion, and each π-electronic system took coplanar with the edged-pyridine moiety through an intramolecular hydrogen bond. The enol group on the phenolic skeleton changed to the keto form, and the pyridine was protonated. Thus, intramolecular proton transfer occurred in L after the complexation. Other complexes take isostructure. The space group is P-1, and the c-axis shrinks with decreasing temperature without a phase transition in EuL. The yellow color caused by the planar structure of L can sensitize ff emission by visible light, and the luminescence color of each complex depends on central Ln ions. Furthermore, a phosphorescence band also appeared at rt with ff emission in LnL. Drastic temperature dependence of luminescence was clarified quantitatively.

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β‐Diketonate Lanthanide Complexes

Wang

2010

Rare Earth Coordination Chemistry

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High yield luminescence of a novel europium complex by excimer excitation and f–f absorption of Eu3+

Cited by 7 publications

References 25 publications

Luminescent sensitization and blue shift emission of Ir(ppy)2(VPHD) by copolymerization with MMA

Luminescent sensitization and blue shift emission of Ir(ppy)2(VPHD) by copolymerization with MMA

Thermosensitive visible-light-excited visible-/NIR-luminescent complexes with lanthanide sensitized by the π-electronic system through intramolecular H-bonding

β‐Diketonate Lanthanide Complexes

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