期刊
RSC ADVANCES
卷 5, 期 1, 页码 75-84出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra13486a
关键词
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资金
- National Natural Science Foundation of China [50990061, 51372143, 21373125]
- Natural Science Foundation of Shandong Province [ZR2010EM017]
A new organic electroluminescent material, monoaza[6]helicene (1), was successfully prepared via an effective photochemical reaction in about 10 minutes with high productivity. The thermal, photophysical, electrochemical properties, quantum chemical and X-ray structural studies as well as characteristics of organic light-emitting diodes were fully investigated. 1 exhibited excellent solubility and high thermal stability. The first singlet excitation energy of 1 was measured to be around 2.92 eV with a HOMO level of -5.19 eV and a LUMO level of -2.27 eV. Helical molecular geometry of 1 effectively blocked the pi-conjugation and decreased the close-packing of molecules. Both the nondoped and doped OLEDs emitted deep-blue light at 444 and 462 nm with CIE coordinates of (0.15, 0.09) and (0.15, 0.10). The doped OLED based on 1 was the first example of helicenes as light emitters that exhibited a brightness of more than 3000 cd m(-2) with high color purity and excellent efficiency stability.
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