Relations between Intramolecular Energy Transfer Efficiencies and Triplet State Energies in Rare Earth β-diketone Chelates
Susumu Sato,Masanobu Wada +1 more
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TLDR
In this paper, the intramolecular energy transfer mechanisms for europium chelates and terbium chelsates are proposed, taking the resonance exchange interaction and the thermal deactivation processes from the emitting levels of rare earth ions into consideration.Abstract:
The fluorescence yield of europium chelates in several solutions varies, through its maximum value, with the increase in the energy difference between the triplet state of a ligand and the emitting level of an europium ion. The time-resolved spectroscopic measurements show that the excitation energy is transferred from the triplet state to the lower and nearest resonance level of the europium ion. The intramolecular energy transfer mechanisms for europium chelates and terbium chelates are proposed, taking the resonance exchange interaction and the thermal deactivation processes from the emitting levels of rare earth ions into consideration. Steady-state rate equations are made, and the equation of the fluorescence yield is obtained. Thus, the relations between the fluorescence yield and the triplet state energy are estimated and the fluorescence properties of rare earth β-diketone chelates may be qualitatively described.read more
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Interpretation of europium(III) spectra
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Correlation between the lowest triplet state energy level of the ligand and lanthanide(III) luminescence quantum yield
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TL;DR: In this article, the luminescence properties of 41 different Eu(III) and Tb(III), chelates that were synthesized with the purpose of developing new markers for chemical and biochemical applications were measured in aqueous solution and their suitability for labels in time resolved immunoassays were evaluated.
References
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A Theory of Sensitized Luminescence in Solids
TL;DR: In this article, the resonance theory of Forster, which involves only allowed transitions, is extended to include transfer by means of forbidden transitions which, it is concluded, are responsible for the transfer in all inorganic systems yet investigated.
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Intramolecular Energy Transfer in Rare Earth Chelates. Role of the Triplet State
TL;DR: In this paper, it is shown that the intramolecular energy transfer efficiency is a sensitive function of the relative positions of the resonance energy levels of the ions and the metastable triplet states of the complexes.
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Substituent Effects on Intramolecular Energy Transfer. I. Absorption and Phosphorescence Spectra of Rare Earth β-Diketone Chelates
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Optical maser action in europium benzoylacetonate
A. Lempicki,H. Samelson +1 more
TL;DR: In this article, the optical maser action in a metalloorganic complex contained in solution is reported. But the new feature of this system is that the emitting ion is excited by an energy transfer process rather than by direct absorption of pump radiation.