Charge carrier mobility and electroluminescence in a green-emitting alternating block copolymer with a methoxy bi-substituted chromophore

Ma, Dongge; Hümmelgen, Ivo A.; Jing, Xiabin; Wang, Daike; Hong, Zhiyong; Wang, Lixiang; Zhao, Xiaofei

doi:10.1590/s0103-97332000000200021

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“…Thus, the role of the diphenylamino moieties for significant improvement in the holeinjection properties can be expected, as observed in the following double-layer device results. To investigate their hole-transporting properties, the hole drift mobility of the resulting compounds is calculated by using the hole-only devices with the structure of ITO/2-6/Al, 11,12 as summarized in Table 1. It can be seen that the hole drift mobility is greatly dependent upon the number and the position of the diphenylamine moiety.…”

Section: Electrochemical Propertiesmentioning

confidence: 99%

Novel hole-transporting materials based on 1,4-bis(carbazolyl)benzene for organic light-emitting devices

et al. 2004

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Novel hole-transporting molecules containing 1,4-bis(carbazolyl)benzene as a central unit and different numbers of diphenylamine moieties as the peripheral groups have been synthesized and characterized. These compounds are thermally stable with high glass transition temperatures of 141-157 uC and exhibit chemically reversible redox processes. Their amorphous state stability and hole transport properties can be significantly improved by increasing the number of diphenylamine moieties in the outer part and by controlling the symmetry of the carbazole-based molecules. These compounds can be used as good hole-transporting materials for organic electroluminescent (EL) devices. The device performance based on tri-and tetra-substituted carbazole derivatives is comparable to that of a typical 4,4'-bis[N-(1-naphthyl)-N-phenylamino] biphenyl (NPB)-based device.

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Section: Electrochemical Propertiesmentioning

confidence: 99%