White emission from dinuclear cyclometalated platinum(II) complex in single-emitting layer PLEDs |
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Authors: | Yafei WangXianping Deng Yu Liu Meijun NiMing Liu Hua TanXiaoshuang Li Weiguo Zhu Yong Cao |
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Affiliation: | a College of Chemistry, Key Lab of Environment-Friendly Chemistry and Application of the Ministry of Education, Xiangtan University, Xiangtan 411105, China b Institute of Polymer Optoelectronic Material and Devices, South China University of Technology, Guangzhou 510640, China |
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Abstract: | A dinuclear platinum(II) complex of (dfppy)2Pt2(dipic) has been prepared, where dfppy is 2,4-difluorophenylpyridine and dipic is a biphenyl-bridged bi-picolinic acid derivative. Its physical and optoelectronic properties, as well as molecular orbitals calculation have been investigated and compared with those of its mono-nuclear (dfppy)Pt(pic) complex. Both platinum(II) complexes exhibited almost identical photoluminescence (PL) spectra with deep blue emission in dilute dichloro-methane (10−5 M) and different PL spectra with red emission in their neat films. Stable white emissions were obtained in the (dfppy)2Pt2(dipic)-doped polymer light-emitting devices using a blend of poly(vinylcarbazole) and 2-(4-biphenyl)-5-(4-tert-butyl-phenyl)-1,3,4-oxadiazole as a host matrix at dopant concentrations from 1 wt % to 10 wt %. In contrast, the (dfppy)Pt(pic)-doped devices exhibited orange-red emissions in the same device configuration. It indicates that dinuclear platinum(II) complex with a non-planar structure is an effective way to control formation excimers of platinum(II) complex and get white-emitting PLEDs with single dopant. |
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Keywords: | Electroluminescence Dinuclear platinum(II) complex Polymer light-emitting devices White light |
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