期刊
CHEMISTRY OF MATERIALS
卷 28, 期 23, 页码 8556-8569出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.6b03177
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资金
- National Natural Science Foundation of China [21572176, 20902072]
- Fundamental Research Funds for the Central Universities [cxtd2015003]
- China Postdoctoral Science Foundation [20130201110034, 2014M562403]
- Program for New Century Excellent Talents in University
- Ministry of Education of China [NECT-09-0651]
- Key Creative Scientific Research Team in Yulin City of Shaanxi Province
- State Key Laboratory for Mechanical Behavior of Materials
A cyclometalating ligand containing a 9-phenyl-9-phosphafluorene oxide (PhFIPO) moiety has been synthesized and used to construct asymmetric tris-heteroleptic cyclometalating Ir-III complexes in combination with other ppy-type (Hppy = 2-phenylpyridine) ligands containing a functional group with a different charge carrier injection/transporting character. Their photophysical properties, electrochemical behaviors, and electroluminescent (EL) performances have been characterized in detail. Time dependent density functional theory (TD-DFT) and natural transition orbital (NTO) calculation were carried out to gain insight into the photophysical properties of these complexes. The NTO results show that the characters of the lowest triplet excited states (T-1) can be delicately manipulated through the combination of different cyclometalating ligands. In addition, the strong electron injection/transporting (EI/ET) ability associated with the PhFlPO moiety can confer EI/ET properties to the asymmetric tris-heteroleptic cyclometalating Ir-III complexes. Consequently, the solution-processed organic light emitting diodes/devices (OLEDs) based on these asymmetric tris-heteroleptic Trill phosphorescent complexes can exhibit outstanding electroluminescent (EL) performances with the maximum external quantum efficiency (eta(ext)) of 19.3%, current efficiency (eta(L)) of 82.5 cd A(-1), and power efficiency (eta(p)) of 57.31 m W-1 for the yellow-emitting device. These results show the great potential of a PhFlPO moiety in developing phosphorescent emitters and functional materials with excellent EVET properties.
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