Katholieke Universiteit Leuven, Department of Chemistry, Celestijnenlaan 200F-bus 2404, B-3001 Leuven, Belgium.
Phys Chem Chem Phys. 2010 Feb 28;12(8):1879-85. doi: 10.1039/b920145a. Epub 2009 Dec 21.
Flexible luminescent polymer films were obtained by doping europium(III) complexes in blends of poly(methyl methacrylate) (PMMA) and the ionic liquid 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [C(6)mim][Tf(2)N]. Different europium(III) complexes have been incorporated in the polymer/ionic liquid matrix: [C(6)mim][Eu(nta)(4)], [C(6)mim][Eu(tta)(4)], [Eu(tta)(3)(phen)] and choline[Eu(dpa)(3)], where nta is 2-naphthoyltrifluoroacetonate, tta is 2-thenoyltrifluoroacetonate, phen is 1,10-phenanthroline, dpa is 2,6-pyridinedicarboxylate (dipicolinate) and choline is the 2-hydroxyethyltrimethyl ammonium cation. Bright red photoluminescence was observed for all the films upon irradiation with ultraviolet radiation. The luminescent films have been investigated by high-resolution steady-state luminescence spectroscopy and by time-resolved measurements. The polymer films doped with beta-diketonate complexes are characterized by a very intense (5)D(0)-->(7)F(2) transition (up to 15 times more intense than the (5)D(0)-->(7)F(1)) transition, whereas a marked feature of the PMMA films doped with choline[Eu(dpa)(3)] is the long lifetime of the (5)D(0) excited state (1.8 ms).
柔性发光聚合物薄膜是通过在聚甲基丙烯酸甲酯（PMMA）和离子液体 1-己基-3-甲基咪唑双（三氟甲基磺酰基）亚胺（[C6mim][Tf2N]）的混合物中掺杂铕（III）配合物而获得的。不同的铕（III）配合物已被掺入聚合物/离子液体基质中：[C6mim][Eu（nta）（4）]，[C6mim][Eu（tta）（4）]，[Eu（tta）（3）（phen）]和[choline]（3）[Eu（dpa）（3）]，其中nta 是 2-萘酰基三氟乙酰丙酮，tta 是 2-噻吩酰基三氟乙酰丙酮，phen 是 1,10-菲咯啉，dpa 是 2,6-吡啶二羧酸（二吡咯烷）和胆碱是 2-羟乙基三甲基铵阳离子。所有薄膜在紫外线辐照下都观察到明亮的红色光致发光。通过高分辨率稳态发光光谱和时间分辨测量研究了发光薄膜。掺杂β-二酮配合物的聚合物薄膜的特征在于非常强的（5）D0-（7）F2跃迁（比（5）D0-（7）F1跃迁强 15 倍），而 PMMA 薄膜掺杂[choline]（3）[Eu（dpa）（3）]的明显特征是（5）D0 激发态的长寿命（1.8ms）。
