期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 16, 期 10, 页码 4510-4521出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cp53797h
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资金
- Fundamental Technology Development Programs for the Future through the Korea Institute of Science and Technology (KIST) [2E23752-13-038]
- Korea Evaluation Institute of Industrial Technology (KEIT)
- Ministry of Knowledge Economy (MKE, Korea) [10042682]
- Chungcheong Institute for Regional Program Evaluation (CIRPE) [A0046 00226]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10042682, R0001846] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [10Z20130012349] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The increase in phosphorescence efficiency was estimated by the energy transfer mechanism for divergent iridium dendrimers with peripheral phenylcarbazole units. A series of Ir-core/phenylcarbazole-end dendrons of the type, Ir(dfppy)(2)(pic-Cz(n)) (Gn, n = 0, 1, 2, and 3), was synthesized, where dfppy, pic, and Cz(n) (n = 2, 4, and 8) are 2-(4,6-difluorophenyl)pyridine, picolinate substituted with Cz(n) at the 3-position, and 4-(9-carbazolyl)phenyldendrons connected with 3,5-di(methyleneoxy)benzyloxy branches, respectively. Selective excitation of the Cz(n) units of G1-G3 resulted in >90% quenching of the Cz fluorescence accompanied by the growth of phosphorescence from the Ir(dfppy) 2(pic) core as a consequence of energy transfer from the excited-singlet Cz(n) chromophore to the core. The rate constants of energy transfer were determined by steady-state and transient spectroscopic measurements to be 4.32 x 10(9) s(-1) (G1), 2.37 x 10(9) s(-1) (G2), and 1.46 x 10(9) s(-1) (G3), which were in good agreement with those calculated using the Forster model. The phosphorescence enhancements were 157 (G1), 213 (G2), and 264% (G3) when compared to the phosphorescence of the core Ir(dfppy)(2)(pic-Ph-2) (G0), in which pic-Ph-2 is 3-(3,5-dibenzyloxybenzyl) picolinate.
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