期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 21, 页码 10684-10694出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm16674g
关键词
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资金
- National Science Council of Taiwan
- Ministry of Economic Affairs [100-EC-17-A-08-S1-042]
We report on the synthesis of a new series of Os(II) complexes (1-3) functionalized with 2-pyridyl (or 2-isoquinolyl) pyrazole chelates, together with a new diphosphine, 1,2-bis(phospholano)benzene chelate (pp2b). The resulting Os(II) complexes are fully characterized and their structural versus spectroscopic properties have been comprehended by absorption/emission together with computational approaches. The inherent electron richness, restricted rotational barrier and good steric hindrance of pp2b lead to the production of both orange and red phosphorescence with high quantum efficiency. For exploring these Os(II) based OLEDs, we also synthesized a bipolar material 5-[4-(carbazo-9-yl)phenyl] dibenzophosphole-5-oxide (CzPhO), possessing both carbazole donor and dibenzophosphole oxide acceptor. Successful fabrication of OLEDs using complexes 1 and 3 as the dopant and either 4,4'-N,N'-dicarbazolebiphenyl (CBP) or CzPhO as host is reported. For comparison, the CBP and CzPhO devices with 1 as the emitter showed peak efficiencies EQE of 10.9%, eta(L) of 21.7 cd A(-1), and eta(p) of 11.9 lm W-1, and EQE of 14.3%, eta(L) of 34.8 cd A(-1), and eta(p) of 45.2 lm W-1, respectively.
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