Enhancement of the luminescent intensity of the novel system containing Eu 3+ ‐β‐diketonate complex doped in the epoxy resin

• Published in: Journal of applied polymer science Vol. 83; no. 12; pp. 2716 - 2726
• Main Authors: Parra, Duclerc Fernandes, Brito, Hermi Felinto, Matos, Jivaldo Do Rosário, Dias, Luís Carlos
• Format: Journal Article
• Language: English
• Published: 21-03-2002
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.10252

Abstract
Photoluminescent properties of the europium tris(thenoyltrifluoroacetonate) dihydrate [Eu(TTA)
3
(H
2
O)
2
] incorporated in epoxy resin in the solid state are reported. The polymeric Eu
3+
complex and the precursor compound were characterized by elemental analysis, thermogravimetry (TG), differential scanning calorimetry (DSC), infrared spectroscopy, nuclear magnetic resonance (NMR), and electronic spectroscopy. Due to efficient energy transfer from the polymer to the rare earth ion, the polymer phosphorescence intensity was observed to decrease with an increase of the Eu
3+
ion concentration. High values of the Ω
2
intensity parameter were obtained, reflecting the hypersensitive character of the
5
D
0
→
7
F
2
transition and indicating that the Eu
3+
ions are in a highly polarizable chemical environment. This is consistent with systems containing epoxy resin that generally show a higher value for the Ω
4
parameter as a consequence of the difference in the basicity of the oxygen donor from the polymer. Lifetime measurement (τ = 0.442 ms) suggests that the Eu
3+
luminescence has a higher efficiency than in the case of hydrated compound (τ = 0.260 ms). The emission quantum efficiency shows higher luminescence for the polymer containing 1% of Eu
3+
‐β‐diketonate complex. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 2716–2726, 2002