期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 115, 期 23, 页码 11749-11757出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp201000q
关键词
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资金
- National Basic Research Program of China (973 Program) [2009CB930601]
- National Natural Science Foundation of China [50803028, 20804019]
- Natural Science Foundation of Jiangsu Province of China [BK2009427]
- Natural Science Fund for Colleges and Universities in Jiangsu Province [10KJB430010]
- Scientific and Technological Activities for Returned Personnel in Nanjing City [NJ209001]
- Nanjing University of Posts and Telecommunications [NY208045]
- University of Jiangsu Province [CX10B_201Z]
- Japan Society for Promotion of Science [22560013]
- Grants-in-Aid for Scientific Research [22560013] Funding Source: KAKEN
The formation of a beta phase and its influence on the energy transfer efficiency were investigated for a series of polyfluorenes containing different contents of phosphorescent iridium(III) complex under various conditions. The effects of iridium(III) complex content, solution concentration, solvent/nonsolvent ratio, as well as temperature on the beta-phase formation in the copolymers were studied through UV vis absorption, photoluminescence, and excitation spectra. First, it was easier to form a beta phase for the copolymers with a low content of iridium (III) complex than those with a high content of iridium(III) complex. Second, an aggregation-induced beta-phase formation for the copolymers was significantly displayed in the highly concentrated THF solution or THF/H(2)O mixtures. In addition, temperature was another factor for beta-phase formation. And the p phase could be easily formed at low temperatures for copolymer films. On the basis of the above experimental results, the improved energy transfer from polyfluorene to iridium (110 complex was also observed through the beta-phase formation.
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