Pyridine-2,6-dicarboxylic acid for the sensitization of europium(III) luminescence with very long lifetimes

作者：Tao, Chaoyou; Du, Kai; Yin, Qiang; Zhu, Jiayi; Yan, Hongwei; Zhu, Fanghua; Zhang, Lin^*

来源：RSC Advances, 2015, 5(72): 58936-58942.

DOI：10.1039/c5ra08393a

• COORDINATION POLYMERS
• COMPLEXES
• EU3+
• CHROMOPHORE
• LIGANDS
• PR(III)
• TERBIUM
• NUMBER

Convenient and mild syntheses of two europium(III) complexes, Na[Eu(dipic)(2)center dot 3H(2)O]center dot 4H(2)O (dipic = dipicolinate anions) and Na[Eu(dipic)(2)center dot phen]center dot H2O (phen = 1,10-phenanthroline), were reported. These two europium(III) complexes were confirmed by H-1 NMR, FT-IR, UV-Vis spectroscopy, and elemental and lifetime analysis. Interestingly, the lifetimes were 2.31 ms and 2.38 ms for Na[Eu(dipic)(2)center dot 3H(2)O]center dot 4H(2)O in the solid state and in ethanol solution, respectively, though high-frequency vibrations were present in the first coordination sphere. Furthermore, the lifetime for Na[Eu(dipic)(2)center dot phen]center dot H2O in ethanol solution is 3.23 ms, which is the longest lifetime reported to date. The Na[Eu(dipic)(2)center dot phen]center dot H2O complexes exhibited a quantum yield of 36.1% in ethanol solution, which was longer than that of Na [Eu(dipic)(2)center dot 3H(2)O]center dot 4H(2)O. The value of the stimulated emission cross-section (sigma(p)) for Na[Eu(dipic)(2)center dot phen]center dot H2O in ethanol was very close to the values of the Nd-glass laser for practical use, which showed that it had potential application as a high-powered liquid laser medium.

• 出版日期2015
• 单位中国工程物理研究院; 中国工程物理研究院激光聚变研究中心