Journal
JOURNAL OF LUMINESCENCE
Volume 93, Issue 3, Pages 191-197Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0022-2313(01)00200-9
Keywords
concentration quenching of luminescence; lanthanide; europium; beta-diketonate complexes
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Europium tris-beta -diketonates (Eu(L)(3). nH(2)O) show concentration quenching of luminescence in toluene solutions due to the formation of weakly luminescent dimers. Addition of water to the concentrated toluene solutions of Eu(L)(3). nH(2)O unexpectedly enhances quantum yield (phi) and lifetime of Eu3+ luminescence by causing dissociation of dimers and by reducing quenching of excited Eu3+ through the ligand-to-metal charge transfer (LMCT). Water also enhances phi, of Eu(L)(3). nH(2)O in acetonitrile (although to a lower extent than in toluene) only by reducing LMCT quenching of Eu3+. (C) 2001 Elsevier Science B.V. All rights reserved.
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