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Chiral multiple-resonance thermally activated delayed fluorescence materials based on chiral spiro-axis skeleton for efficient circularly polarized electroluminescence

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Science China Chemistry 2024年第7期67卷 2257-2264页

作者： Shi-Quan Song Xiao Han Zhong-Zhong Huo ching-fai yip Xian-Fang Hong Meng-Ning Ding You-Xuan Zheng State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Key Laboratory of Mesoscopic Chemistry of Ministry of Education School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

Chiral luminescence materials have potential applications in the field of three-dimensional displays due to their circularly polarized luminescence(CPL)***,the further development of circularly polarized organic light-emitting diodes(CP-OLEDs)needs to meet the requirements of high efficiency,high color purity,low cost,and high dissymmetry factor(gPLor gEL),chiral multiple resonance thermally activated delayed fluorescence(MR-TADF)materials are considered as candidates in these ***,based on a pair of chiral spirofluorene precursors,two pairs of high-performance chiral MR-TADF emitters((R/S)-p-Spiro-DtBuCzB and(R/S)-m-Spiro-DtBuCzB)are developed,which exhibit strong emissions peaking at 491 and 502 nm in toluene with full-width at half-maximum values of 25 and 33 nm,*** addition,small singlet–triplet energy gaps of 0.15 and 0.10 eV with high absolute photoluminescence efficiencies of 95.0%and 96.7%are observed for p-Spiro-DtBuCzB and m-Spiro-DtBuCzB molecules,*** based on p-Spiro-DtBuCzB and m-Spiro-DtBuCzB display high maximum external quantum efficiencies of 29.6%and 33.8%,*** importantly,CP-OLEDs present symmetric circularly polarized electroluminescence spectra with|gEL|factors of 3.36×10^(-4)and 7.66×10^(-4)for devices based on(R/S)-p-Spiro-DtBuCzB and(R/S)-m-Spiro-DtBuCzB enantiomers,respectively.

关键词： chiral spiro-axis skeleton-based material multiple resonance thermally activated delayed fluorescence circularly polarized electroluminescence dissymmetry factor external quantum efficiency

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A chiral spirofluorene-embedded multiple-resonance thermally activated delayed fluorescence emitter for efficient pure-green circularly polarized electroluminescence

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Aggregate 2024年第2期5卷 261-267页

作者： Xu-Feng Luo Shi-Quan Song Xueying Wu ching-fai yip Songliang Cai You-Xuan Zheng State Key Laboratory of Coordination Chemistry Collaborative Innovation Center of Advanced MicrostructuresJiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjingP.R.China GDMPA Key Laboratory for Process Control and Quality Evaluation of Chiral Pharmaceuticals Guangzhou Key Laboratory of Analytical Chemistry for BiomedicineSchool of ChemistrySouth China Normal UniversityGuangzhouP.R.China

The simultaneous achievement of chiral multiple-resonance thermally activated delayed fluorescence(MR-TADF)emitters with narrowband and circularly polarized electroluminescence(CPEL)poses a ***,a MR-TADF emitter,Spiro-BNCz,embedding spirofluorene structure was developed and chiral separated,whose emission peaks at 528 nm in toluene with Commission Internationale de L’Eclairage coordinates of(0.26,0.69).The conjugation extension caused by embedding sulfur substituted spirofluorene on B/N framework shortens the singlettriplet energy gap and increases spin-orbital coupling matrix ***,a fast reverse intersystem crossing rate constant of 2.8×10^(6)s^(−1)and a high photoluminescence efficiency of 92%in film were *** organic light-emitting diode(OLED)exhibits a maximum external quantum efficiency of 32.3%.Particularly,the circularly polarized OLEDs based on Spiro-BNCz enantiomers show symmetric CPEL with dissymmetry factors(|gEL|)≈10^(−3).

关键词： circularly polarized electroluminescence CP-MR-TADF emitter organic light-emitting diode pure green sulfur substituted spirofluorene

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Ferroptosis and glaucoma: implications in retinal ganglion cell damage and optic nerve survival

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Neural Regeneration Research 2023年第3期18卷 545-546页

作者： Ming Yang Kwok-fai So Wai-ching Lam Amy Cheuk Yin Lo Department of Ophthalmology School of Clinical MedicineLi Ka Shing Faculty of MedicineThe University of Hong KongHong Kong Special Administrative RegionChina State Key Laboratory of Brain and Cognitive Sciences The University of Hong KongHong Kong Special Administrative RegionChina GHM Institute of CNS Regeneration Jinan UniversityGuangzhouGuangdong ProvinceChina

Glaucoma and visual pathway degeneration:Glaucoma is the leading cause of irreversible blindness worldwide,which leads to a progressive loss of *** can be classified into two types:primary open-angle glaucoma and primary closed-angle *** open-angle glaucoma can be caused by the blockage of the trabecular meshwork,and this results in elevation of the intraocular pressure(IOP),leading to retinal ganglion cell(RGC)***,many glaucoma patients have normal IOP;this is known as normal-tension ***,excitotoxic damage and oxidative stress can also lead to RGC damage in normal-tension glaucoma(Almasieh et al.,2012).Glaucomatous genes such as TIGR,OPTN,and CYP1B1 have been suggested to contribute to the pathogenesis of ***,some glaucomatous patients may remain asymptomatic in the early,moderate,and late *** type of glaucoma is primary closed-angle *** this clinical condition,a relative pupillary block is contributed by the iris obstructing aqueous *** patients may suffer from corneal swelling,headache,nausea,and blurred vision during the acute phase.

关键词： glaucoma damage degeneration

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Rare case of intussusception in an adult with acute myeloid leukemia

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World Journal of Gastroenterology 2015年第2期21卷 688-693页

作者： Man fai Law Cheuk Kei Wong Chun Yin Pang Hay Nun Chan Ho Kei Lai Chung Yin Ha Celia Ng Yiu Ming Yeung Sze fai yip Department of Medicine Tuen Mun Hospital Department of Medicine and Therapeutics Prince of Wales Hospital Department of Radiology Kwong Wah Hospital Department of Pathology Tuen Mun Hospital

Intussusception is rarely reported in adult patients with acute leukemia. We report a case of intussusception in a 29-year-old woman with acute myeloid leukemia(AML). She developed right lower quadrant pain, fever, and vomiting on day 16 of induction *** examination showed tenderness and guarding at the right lower quadrant of the abdomen. Abdominal computed tomography(CT) showed distension of the cecum and ascending colon, which were filled with loops of small bowel, and herniation of the ileocecal valve into the cecum. We proceeded to laparotomy and revealed ileocecal intussusception with the ileocecal valve as the leading point. The terminal ileum was thickened and invaginated into the cecum, which showed gangrenous changes. Right hemicolectomy was performed and microscopic examination of the colonic tissue showed infiltration of leukemic cells. The patient recovered after the operation and was subsequently able to continue treatment for AML. This case demonstrates that the diagnosis of intussusception is difficult because the presenting symptoms can be non-specific, but abdominal CT can be informative for preoperative diagnosis. Resection of the involved bowel is recommended when malignancy is suspected or confirmed. Intussusception should be considered in any leukemia patients presenting with acute abdomen. A high index of clinical suspicion is important for early diagnosis.

关键词： Intussusception Acute leukemia Abdominal pain Colo

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Lycium barbarum extract promotes M2 polarization and reduces oligomeric amyloid-β-induced inflammatory reactions in microglial cells

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Neural Regeneration Research 2022年第1期17卷 203-209页

作者： Zhong-Qing Sun Jin-Feng Liu Wei Luo ching-Hin Wong Kwok-fai So Yong Hu Kin Chiu Department of Ophthalmology Li Ka Shing Faculty of MedicineThe University of Hong KongHong Kong Special Administrative RegionChina State Key Laboratory of Brain and Cognitive Sciences The University of Hong KongHong Kong Special Administrative RegionChina Guangdong-Hong Kong-Macao Institute of CNS Regeneration Jinan UniversityGuangzhouGuangdong ProvinceChina Department of Orthopaedics&Traumatology The University of Hong KongHong Kong Special Administrative RegionChina

Lycium barbarum(LB)is a traditional Chinese medicine that has been demonstrated to exhibit a wide variety of biological functions,such as antioxidation,neuroprotection,and immune *** of the main mechanisms of Alzheimer’s disease is that microglia activated by amyloid beta(Aβ)transform from the resting state to an M1 state and release pro-inflammatory cytokines to the surrounding *** the present study,immortalized microglial cells were pretreated with *** extract for 1 hour and then treated with oligomeric Aβfor 23 *** results showed that LB extract significantly increased the survival of oligomeric Aβ-induced microglial cells,downregulated the expression of M1 pro-inflammatory markers(inducible nitric oxide synthase,tumor necrosis factorα,interleukin-6,and interleukin-1β),and upregulated the expression of M2 anti-inflammatory markers(arginase-1,chitinase-like protein 3,and interleukin-4).LB extract also inhibited the oligomeric Aβ-induced secretion of tumor necrosis factorα,interleukin-6,and interleukin-1βin microglial *** results of in vitro cytological experiments suggest that,in microglial cells,LB extract can inhibit oligomeric Aβ-induced M1 polarization and concomitant inflammatory reactions,and promote M2 polarization.

关键词： Alzheimer’s disease amyloid-β anti-inflammatory factors Lycium barbarum extract M1 microglia M2 microglia neuroinflammation proinflammatory factors

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Molecular genetic analysis of a Chinese patient with Fabry disease

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Chinese Medical Journal 2000年第2期113卷 90-92页

作者： ching-Wan Lam Ying-Tat Mak Yuk-Ming Dennis Lo Sui-FanTong Ka-fai To Fernand Mac-Moune Lai Department of Chemical Pathology The Chinese University of Hong Kong Prince of Wales Hospital Hong Kong China Department of Anatomical and Cellular Pathology The Chinese University of Hong Kong Prince of Wales Hospital Hong Kong China

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Molecular Advances in Severe Acute Respiratory Syndrome-associated Coronavirus (SARS-CoV)

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Genomics, Proteomics & Bioinformatics 2003年第4期1卷 247-262页

作者： Raymond Kin Hi Hui Raymond Tsz Yeung Wong Chi Wai yip Frederick Chi ching Leung Department of Zoology The University of Hong Kong Hong Kong SAR China.Department of Zoology The University of Hong Kong Hong Kong SAR China.Department of Zoology The University of Hong Kong Hong Kong SAR China.Department of Zoology The University of Hong Kong Hong Kong SAR China.

The sudden outbreak of severe acute respiratory syndrome (SARS) in 2002 prompted the establishment of a global scientific network subsuming most of the traditional rivalries in the competitive field of virology. Within months of the SARS outbreak, collaborative work revealed the identity of the disastrous pathogen as SARS-associated coronavirus (SARS-CoV). However, although the rapid identifi-

关键词： severe acute respiratory syndrome SARS-CoV genome phylogenetics human leukocyte antigen (HLA) system molecular epidemiology

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Changes in the epidemiological profile of suicide in Hong Kong:a 40-year retrospective decomposition analysis

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China Population and Development Studies 2021年第4期5卷 153-173页

作者： Chi-Ting Yang Paul Siu fai yip Department of Statistics and Actuarial Science The University of Hong KongHong KongChina Hong Kong Jockey Club Centre for Suicide Research and Prevention The University of Hong KongHong KongChina Department of Social Work and Social Administration The University of Hong KongHong KongChina

The suicide rate in Hong Kong has increased significantly over the past four *** subgroups such as the elderly or economically-distressed are reported to be more vulnerable than others to suicidal behaviors,while changing suicide meth-ods(such as charcoal burning which emerged in 1998),has also contributed signifi-cantly to increasing suicide ***,the extent of the contribution of different factors to changes in suicide rate remains *** paper reported on a decom-position analysis of the epidemiological profile of suicide in Hong Kong between 1976 and 2015,specifically considering factors underlying the increasing suicide rate over this *** death registry information was available from the Census and Statistics Department of the Hong Kong SAR for this *** compared absolute and relative contributions of gender,age and suicide method to rate changes over *** in suicide rate were generally underpinned by more than one *** aging in a rapidly-aging city contributed significantly to suicide rate increases,whilst jumping from a height had the greatest influence on rate changes throughout the study *** by male aged 25-34 years and 45-54 years were more likely to be triggered by economic factors,compared with the other gender-age *** decomposition approach provided a compre-hensive understanding about how socioeconomic factors and suicide methods inter-acted to influence over-time suicide *** research supports development of more focused suicide prevention measures to reduce suicide rate.

关键词： Suicide Hong Kong Decomposition analysis Epidemiological trend

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Late retroperitoneal recurrence of hepatocellular carcinoma 12 years after initial diagnosis

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World Journal of Gastroenterology 2010年第17期16卷 2187-2189页

作者： Tiffany Cho-Lam Wong Ka-fai To Simon See-Ming Hou Sidney Kam-Hung yip Chi-fai Ng Department of Surgery Prince of Wales HospitalThe Chinese University of Hong Kong Department of Anatomical and Cellular Pathology The Chinese University of Hong Kong

Hepatocellular carcinoma (HCC) is an aggressive tumor with poor long-term ***,we present an unusual patient with a solitary recurrence of HCC in the right kidney 12 years after the initial *** illustrates the importan... 详细信息

关键词： Hepatocellular carcinoma Late recurrence Metastasis Retroperitoneal

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门槛回归模型中门槛值和回归参数的估计

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中国科学：数学 2016年第4期46卷 409-422页

作者：蒋家坤林华珍蒋靓 yip Paul Siu fai 西南财经大学统计学院统计研究中心成都611130 四川大学数学学院成都610064 香港大学社会工作及社会行政学系

门槛模型中有两个关键问题:门槛个数的选择和门槛参数的估计.本文提出的判罚光滑最小二乘方法同时解决这两个问题.本文的方法避免了为确定门槛个数所需的假设检验,计算简单.回归参数估计被证明是n-^(1/2)相合且渐近正态,门槛参数估计被... 详细信息

门槛模型中有两个关键问题:门槛个数的选择和门槛参数的估计.本文提出的判罚光滑最小二乘方法同时解决这两个问题.本文的方法避免了为确定门槛个数所需的假设检验,计算简单.回归参数估计被证明是n-^(1/2)相合且渐近正态,门槛参数估计被证明是(n/h-)^(1/2)相合且渐近正态.数值模拟和实际例子结果显示本文方法有效可行.

关键词：门槛模型光滑最小二乘 SCAD(smoothly clipped absolute deviation)判罚

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