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Chinese Journal of Liquid Crystals and Displays

Chinese Journal of Liquid Crystals and Displays Chinese Journal of Liquid Crystals and Displays
  • Editor-in-Chief:Haicheng Guo
  • ISSN:1007-2780
  • eISSN:2097-3217
  • CN:22-1259/O4
  • Supervisor:Chinese Academy of Sciences
  • Sponsor:Changchun Institute of Optics, Fine Mechanics, and Physics (CIOMP), CAS, Liquid Crystal Branch, Chinese Physical Society, and Liquid Crystal Branch
  • Publication frequency:Monthly
  • Address:No.3888 Dong Nanhu Road, Changchun, Jilin, China 130033
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Volume 41 期 3，2026 2026年第41卷第3期

  • Material Physics

    WU Zuoyong, CHEN Yali, LIN Yuxuan, ZHANG Runzhong, YAO Lishuang

    DOI：10.37188/CJLCD.2025-0253
    摘要：Liquid crystals are anisotropic soft materials that combine fluidity with long-range orientational order， exhibiting pronounced optical， electrical， and mechanical anisotropy， which underpins their widespread use in displays and optical modulation. Furthermore， their unique ordered states also make them ideal model systems for studying symmetry breaking and continuous media order. However， such order is not perfect； defects readily form during self-assembly or under external perturbation. Advances in soft-matter physics and topological field theory have shifted the perception of defects from mere structural imperfections to programmable functional units. In this review， we summarize the origins， classification， and formation mechanisms of defects in liquid crystals， with a focus on their controllable construction via boundary conditions and their emerging applications. First， we outline fundamental defect types， including disclinations and dislocations， and describe their topological characteristics. This is followed by an analysis of the relationship between orientational order and defect formation. We then discuss strategies for regulating defects from three interfacial perspectives： microstructured solid boundaries， spontaneous anchoring at free interfaces， and field-responsive soft fluid interfaces， with an emphasis on spatial and configurational control. Finally， we highlight prospective applications in topological photonics， tunable lasers， microfluidic manipulation， and colloidal assembly.  
    关键词：liquid crystals;Topological defects;manipulation;alignment;interface   
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    ZHANG Shirui, XIE Jinfeng, TANG Wentao, DU Haiqiong, HAN Yujie, WU Yunquan, Craig P YU, XUE Qi, HUANG He

    DOI：10.37188/CJLCD.2026-0022
    摘要：All-inorganic CsPbBr3 perovskite quantum dots （QDs） have demonstrated immense potential for next-generation display technologies owing to their exceptional optical properties. However， surface defects and ion migration induce environmental instability， thereby limiting their practical applications. Although polymer encapsulation can enhance stability， luminescence degradation and poor dispersion remain critical challenges for high-performance composites. In this work， an in-situ slow polycondensation strategy is proposed to construct a polyphosphazene （PZS） coating on CsPbBr3 QDs. The mild polymerization process enables uniform dispersion of QDs within the polymer matrix， while the abundant heteroatoms （N， P， and S） in the PZS effectively passivate surface Pb2+ defects through Lewis base coordination and suppress ion migration. As a result， the average photoluminescence （PL） lifetime is significantly prolonged from 7.50 ns for the pristine QDs to 20.92 ns for the composite， and the composites exhibit excellent stability under water， light， and thermal conditions. After continuous ultraviolet irradiation for 10 h， the PL intensity retention of the composites is improved by 34% compared to that of the pristine QDs. A prototype color-conversion device based on the composite exhibits a narrow-band emission centered at approximately 520 nm with CIE coordinates of （0.155 6， 0.702 9）. This study provides a facile strategy for developing highly stable perovskite-based composites and establishes a solid foundation for their application in high-performance display technologies.  
    关键词：CsPbBr3 perovskite quantum dots;polyphosphazene;surface encapsulation;stability;color-conversion devices   
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  • Device Physics and Device Preparation

    CHEN Ruisi, GUO Xintao, LIU Ying

    DOI：10.37188/CJLCD.2026-0004
    摘要：To address the mismatch between the high-temperature curing required by conventional vertical alignment layers and the limited thermal tolerance of flexible transparent conductive substrates in flexible reverse-mode liquid-crystal （LC） dimming films， a low-temperature vertical alignment process and substrate compatibility screening were investigated. On glass substrates， a low-temperature vertical alignment agent was cured at 120~140 ℃ with a 5 ℃ step to evaluate the effects of curing temperature on LC pretilt angle and its uniformity， together with the variations in transmittance and haze before/after curing. A rubbing treatment was further introduced at the optimal curing temperature to improve alignment quality. The electro-optical response of the aligned LC cell was verified by voltage-transmittance （V-T） characterization， and stability was assessed via room-temperature storage and voltage cycling. Finally， under the same processing conditions， five commercial flexible transparent conductive substrates were compared in terms of sheet-resistance thermal stability and the changes in transmittance/haze after alignment-layer curing， aiming to identify compatible substrates. As the curing temperature increased from 120 ℃ to 140 ℃， the mean pretilt angle decreased from 0.69° to 0.38° and the standard deviation decreased from 0.30° to 0.04°. With rubbing at 140 ℃， the pretilt angle was further reduced to 0.19°， accompanied by a decrease in haze. The LC cell exhibited a clear threshold behavior in the V-T curve （Vth≈8.69 V； Von≈14.06 V）. After 30-day storage at room temperature， the pretilt change was ~0.02°， and electro-optical parameters remained stable after voltage cycling. Among the tested substrates， the f3-type PET/ITO showed the most stable sheet resistance after thermal treatment at 140 ℃ and maintained a high transmittance （~90%） with limited haze variation after curing， outperforming the other candidates. A low-temperature vertical alignment processing window suitable for flexible LC dimming films was established， and a compatible flexible transparent conductive substrate was identified under unified conditions， providing practical guidance for process transfer and substrate selection of flexible reverse-mode LC dimming films.  
    关键词：reverse-mode liquid crystal dimming device;flexible transparent conductive films;low-temperature vertical alignment;pretilt angle   
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    CAI Hankun, YANG Jinjin, LI Zuobin, TU Qiumei, ZHANG Guofeng

    DOI：10.37188/CJLCD.2025-0240
    摘要：In recent years， with the development of tendency toward thinner smartphones and higher reliability （RA） requirements， the proportion of OLED panels exhibiting rainbow phenomenon around the punch-hole area has increased. In response to this phenomenon， we established qualitative and quantitative analyses methods to identify the reasons of this phenomenon and conducted a comprehensive， mutually corroborative set of multi-dimensional analytical testing methods. Furthermore， with optimization of the TFE film-stack composition， the risk of dark spots could be minimized after RA tests， which is associated with rainbow-mura formation in OLED punch-hole displays. Through the cleavage of panel module， rainbow-mura around the punch-hole area was exactly located. Cross-sectional TEM， TOF-SIMS and XPS were then used to elucidate the formation mechanism. The data show that the SiON layer in CVD1 can be gradually converted to SiO under high temperature and high humidity conditions； TEM and TOF-SIMS results reveal that nitrogen content in SiON is below 2% after RA tests， while XPS peaks indicate that the SiON on the CVD1-2 surface has been almost completely transformed into SiO. By increasing the refractive index of the SiON layer from 1.72 to 1.76 in CVD1-1 of the TFE， the oxidation depth of the SiON film was reduced by 70%. The above-mentioned establishment of analytical method not only clarifies that the rainbow-mura phenomenon around the punch-hole is caused by the formation of SiO due to film oxidation， but also quantifies the influences of the punch-hole regions under long-term RA test. This strategic approach provides a viable solution path for OLED’s future deployments in automotive， IT signage， and other applications with more stringent reliability requirements.  
    关键词：rainbow phenomenon;punch-hole in OLED displays;thin-film encapsulation;silicon oxynitride;silicon oxide   
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