期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 4, 期 16, 页码 3492-3498出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6tc00148c
关键词
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资金
- National Basic Research Program of China (973 Program) [2013CB834805, 2015CB655002]
- National Natural Science Foundation of China [91433201, 51573141, 51125013]
- Innovative Research Group of Hubei Province [2015CFA014]
- Yellow Crane Talent Plan of Wuhan
- Fundamental Research Funds for the Central Universities of China
Two deep-red emitting iridium complexes, [(TP-BQ)(2)Ir(acac) and (TPA-BQ)(2)Ir(acac)], with 6-phenanthridine derivatives as cyclometalating ligands were designed and synthesized. The relationship between the structures and their photophysical, electrochemical and electrophosphorescent properties was investigated. The introduction of a phenanthridine moiety enlarges the pi conjugation and causes the peak emissions to red-shift to ca. 660 nm. Meanwhile, the bulky ligands sufficiently protect the emissive core from the intermolecular interaction to decrease triplet-triplet annihilation (TTA). The solution-processed electroluminescent devices with a single emissive layer using (TPA-BQ)(2)Ir(acac) as the triplet emitter achieve a maximum external quantum efficiency (EQE) of 5.2% with the emission peak at 682 nm.
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