18733-91-0Relevant articles and documents
Conjugation-broken thiophene-based electropolymerized polymers with well-defined structures: effect of conjugation lengths on electrochromic properties
Zhang, Ling,Luo, Feifei,Li, Weijun,Yan, Shuanma,Chen, Zhangxin,Zhao, Ruiyang,Ren, Ning,Wu, Yizhao,Chen, Yuliang,Zhang, Cheng
, p. 24092 - 24100 (2019)
A series of monomers containing tetraphenylsilane connected to different thiophenes such as thiophene, bithiophene and terthiophene were designed and synthesized and were further used to prepare the corresponding polymers via electrochemical polymerization (pSiTPTP, pSiTPBTP and pSiTPTTP). From the polymers, the effective conjugate elements were well defined as bithiophene, quaterthiophene and sexithiophene because the sp3 Si atom can block the conjugation between the thiophene units in the polymer backbone. The spectroelectrochemical results indicated that pSiTPTP is incapable of electrochromism, which may be attributed to the insufficient conjugation length of the independent bithiophene. In contrast, both pSiTPBTP and pSiTPTTP exhibited obvious electrochromic properties and furthermore, pSiTPTTP displayed a shorter switching time and better stability. Such different electrochemical behaviors can be ascribed to the looser stacking structure and lower oxidation potential of pSiTPTTP with the independent sexithiophene unit. The EIS measurements also confirmed the lower charge-transfer resistance and higher ion-diffusion rate of pSiTPTTP with the independent sexithiophene unit. Hence, we can conclude that the effects of the electrochromic behavior of the conjugation-broken polythiophene derivatives depend on the increased conjugation length of the thiophene repeating unit, in which the inadequate electrochromism with bithiophene units can change to superior electrochromic properties with increased sexithiophene units.
Iridium complex grafted to 3,6-carbazole-alt-tetraphenylsilane copolymers for blue electrophosphorescence
Teng,Cheng, Gang,Dehua,Dong, Wenyue,Ping,Yuguang
, p. 1859 - 1865 (2010)
We designed a 3,6-dibromo-9-hexyl-9H-carbazole derivative with the blue emissive iridium complex bis[2-(4,6-difluorophenyl)pyridyl-N,C 2′](picolinato)iridium(III) (Flrpic) linked at the alkyl terminal. Based on this monomer, novel 3,6-carbazole-alt-tetraphenylsilane copolymers grafted with Flrpic were synthesized by palladium-catalyzed Suzuki coupling reaction, and the content of Flrpic in the polymers could be controlled by feed ratio of the monomers. The polymer films mainly show blue emission from Flrpic, and the emission intensity from the polymer backbones is much weaker compared with the doped analogues, which demonstrates an efficient energy transfer from polymeric host to covalently bonded guest. The phase separation in the polymers was suppressed, which can be identified by atomic force microscopy and designed electroluminescent (EL) devices. EL devices based on the polymers exhibited blue phosphorescence from Flrpic. The luminous efficiency of preliminary devices reached 2.3 cd/A, and the efficiency roll-off at high current densities was suppressed.
Silicon-based compound and organic light emitting diode comprising the same
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Paragraph 0193-0199, (2019/12/25)
A silicon compound and an organic light emitting device including the same are. disclosed. (by machine translation)
