The study of luminescence of rare-earth organic complexes sensitized Eu 3+ complex in PMMA matrix using combinatorial me
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JJ9.7.1
The study of luminescence of rare-earth organic complexes sensitized Eu3+ complex in PMMA matrix using combinatorial method Jianjun Ding, Hongfang Jiu, Jun Bao1, Jiecheng Lu3, Wanru Gui3, Qijing Zhang2, and Chen Gao1* Structure Research Lab., University of Science & Technology of China, Hefei, Anhui, 230026, China 1) National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230029, P. R. China 2) Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, 230026, P. R. China 3) Department of Electronic Science and Technology, University of Science and Technology of China, Hefei, 230026, P. R. China Abstract A combinatorial approach has been utilized for researching the luminescence of rare-earth ions complexes (RE(DBM)3⋅Phen, RE=Dy3+, La3+, Gd3+, Sm3+, Y3+) sensitized Eu3+ complex in PMMA matrix. The results show that the La3+ complex has the maximum sensitization efficiency among these sensitization ions. The luminescent intensities increase as the Eu content increase in PMMA matrix. The La3+ complex exhibits higher sensitization efficiency at lower Eu content in PMMA matrix. At a content of 5% Eu complex, the maximum sensitization efficiency of La3+ is more than 20 times. Introduction Luminescent rare-earth organic complexes, such as Eu and Tb complexes chelating with β-diketone’s ligands, are of both fundamental and technological interest, due to their characteristic luminescence properties, such as extremely sharp emission bands, long lifetime and potential high internal quantum efficiency. Regarded as light-conversion materials, these complexes have been widely applied in a variety of areas, such as fluoroimmunoassays [1,2], electroluminescence devices [3,4], and polymer optical fiber [5,6], etc. The luminescence of rare-earth ions stems from intra-4f transitions, which in principal are forbidden transitions, results in relatively low emission intensity. From a practical point of view, it is necessary to further enhance the emission intensity. An effective approach is to change the complexes with different kinds of ligands that have broad and intense absorption bands [7,8], which transfers a part of its energy to the higher energy levels of rare-earth ions. Another way is to mix the complexes with different sensitization ions [9,10]. In both cases, there exist energy transfer processes. In this paper, combinatorial method was used to investigate the effects of different kinds and contents of sensitization ions on the luminescence of Eu3+-doped PMMA.
JJ9.7.2
Experiment Rare-earth complexes (RE(DBM)3⋅Phen, RE=Eu3+, Dy3+, La3+, Gd3+, Sm3+, Y3+) were synthesized according to the procedure reported in literature [11]. The final products were recrystallized in acetone/petroleum ether (2:1). The rare-earth complexes and PMMA were dissolved in cyclopentanone solvent respectively, with a ratio of 0.5g/100ml. Then the solutions were deposited into the φ4mm wells drilled on a fluorophlogopite substrate using a micro liter pipette.
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