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High dielectric polymer and its application on electro-optical Kerr effect of blue phase liquid crystal
摘要： We present a high-dielectric polymer with a lateral ?uorine group, and its dielectric constant exhibits larger than 20 at 1 kHz. This well-soluble polymer can solely stabilize blue phase liquid crystals (BPLCs) while reducing the operating voltage by 30% and increasing the Kerr constant by nearly 70.6%. The in?uence of the polymer’s dielectric property on the operating voltage is investigated based on the potential distribution. The theoretical result predicts that the operation voltage can be further reduced by 50% when the dielectric constant of the chiral dopant is the same as the high-dielectric polymer. The potential application of high-dielectric materials for the improvement of BPLC devices is foreseeable.
关键词： Kerr constant,blue phase liquid crystals,high-dielectric polymer,electro-optical Kerr effect,operating voltage
更新于2025-11-14 17:28:48
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Work Function-Tunable Graphene-Polymer Composite Electrodes for Organic Light-Emitting Diodes
摘要： Graphene has been regarded as one of the most promising transparent electrodes in flexible optoelectronic devices. Tremendous efforts have been paid on tuning the work function of graphene, which make significant contributions to improve the device performance. In this work, we propose to modify single layer graphene film with ultrathin high dielectric polymers, including polyvinylidene chloride (PVDC) and polyvinylidene difluoride (PVDF) with the dielectric constants of 4.7 and 8.4, respectively. Ultraviolet photoelectron spectroscopy confirms the formation of interfacial dipoles induced by the high dielectric polymers, and the work function can be tuned from 4.6 eV for pristine graphene to 4.72 and 4.94 eV for PVDF and PVDC modified graphene, respectively. Accordingly, organic light-emitting diodes (OLEDs) are fabricated, and the one based on PVDC-modified graphene composite electrode obtained the highest current efficiency of 80.0 cd/A with a 1.27-fold enhancement compared with the pristine counterpart. This work provides an alternative strategy of interfacial dipole to surface chemical doping method to tune the work function of graphene electrodes, and the utilization of a polymer with high dielectric constant to modify graphene successfully realized the fabrication of highly efficient OLEDs.
关键词： graphene,work function,high dielectric polymer,interface dipole,OLEDs
更新于2025-09-23 15:19:57