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On the voltage behavior of quantum dot light-emitting diode

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Nano Research 2023年第4期16卷 5511-5516页

作者： Xiangwei Qu Jingrui Ma Pai Liu Kai Wang xiao wei sun Institute of Nanoscience and Applications Southern University of Science and TechnologyShenzhen 518055China Key Laboratory of Energy Conversion and Storage Technologies(Southern University of Science and Technology) Ministry of EducationGuangdong University Key Laboratory for Advanced Quantum Dot Displays and LightingGuangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and DevicesShenzhen Key Laboratory for Advanced Quantum Dot Displays and Lightingand Department of Electrical and Electronic EngineeringSouthern University of Science and TechnologyShenzhen 518055China

The origin of the efficiency drop of quantum dot light-emitting diode(QLED)under consecutive voltage sweeps is still a *** this work,we report the voltage sweep behavior of *** observed the efficiency drop of red QLED with ZnMgO electron transport layer(ETL)under consecutive voltage *** contrast,the efficiency increases for ZnO ETL *** analyzing the electrical characteristics of both devices and surface traps of ZnMgO and ZnO nanoparticles,we found the efficiency drop of ZnMgO device is related to the hole leakage mediated by trap state on ZnMgO *** ZnO device,the efficiency raise is due to suppressed electron *** hole leakage also causes rapid lifetime degradation of ZnMgO ***,the efficiency and lifetime degradation of ZnMgO device can be eliminated with shelf *** work reveals the distinct voltage sweep behavior of QLED based on different ETLs and may help to understand the lifetime degradation mechanism in QLED.

关键词： quantum dot light-emitting diode voltage sweep behavior efficiency drop hole leakage current

Acupuncture promotes functional recovery after cerebral hemorrhage by upregulating neurotrophic factor expression

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Neural Regeneration Research 2020年第8期15卷 1510-1517页

作者： Dan Li Qiu-Xin Chen wei Zou xiao-wei sun Xue-Ping Yu xiao-Hong Dai wei Teng Third Department of Acupuncture First Affiliated HospitalHeilongjiang University of Chinese MedicineHarbinHeilongjiang ProvinceChina Department of Acupuncture Third Affiliated HospitalBeijing University of Chinese MedicineBeijingChina

Acupuncture is widely used in the treatment of cerebral hemorrhage,and it improves outcomes in experimental animal models and ***,the mechanisms underlying the effectiveness of acupuncture treatment for cerebral hemorrhage are still *** this study,a model of intracerebral hemorrhage was produced by injecting 50μL autologous blood into the caudate nucleus in Wistar *** at Baihui(DU20)and Qubin(GB7)acupoints was performed at a depth of 1.0 inch,12 hours after blood injection,once every 24 *** needle was rotated at 200 r/min for 5 minutes,For each 30-minute session,needling at 200 r/min was performed for three sessions,each lasting 5 *** the positive control group,at 6 hours,and 1,2,3 and 7 days after induction of hemorrhage,the rats were intraperitoneally injected with 1 mL aniracetam(0.75 mg/mL),three times a *** Bederson behavioral test was used to assess palsy in the contralateral *** blot assay was used to examine the expression levels of Nestin and basic fibroblast growth factor in the basal *** was performed to count the number of Nestin-and glial cell line-derived neurotrophic factor-positive cells in the basal *** effectively reduced hemorrhage and brain edema,elevated the expression levels of Nestin and basic fibroblast growth factor in the basal ganglia,and increased the number of Nestin-and glial cell line-derived neurotrophic factor-positive cells in the basal ***,these findings suggest that acupuncture promotes functional recovery after cerebral hemorrhage by increasing the expression of neurotrophic *** study was approved by the Committee for Experimental Animals of Heilongjiang Medical Laboratory Animal Center(approval No.2017061001)on June 10,2017.

关键词： acupuncture basic fibroblast growth factor brain cell protection cerebral hemorrhage electron microscope glial cell line-derived neurotrophic factor immunohistochemistry Nestin western blot assay

Baihui(DU20)-penetrating-Qubin(GB7) acupuncture inhibits apoptosis in the perihemorrhagic penumbra

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Neural Regeneration Research 2018年第9期13卷 1602-1608页

作者： Beng Zhang xiao-Hong Dai Xue-Ping Yu wei Zou wei Teng xiao-wei sun wei-wei Yu Hao Liu Hui Wang Meng-Juan sun Meng Li Heilongjiang University of Chinese Medicine Harbin Heilongjiang Province China First Affiliated Hospital Heilongjiang University of Chinese Medicine Harbin Heilongjiang Province China Clinical Key Laboratory of Integrated Traditional Chinese and Western Medicine Heilongjiang University of Chinese Medicine HarbinHeilongjiang Province China Department of Acupuncture and Moxibustion Tongde Hospital of Zhejiang Province Hangzhou Zhejiang Province China

Baihui（DU20）-penetrating-Qubin（GB7） acupuncture can inhibit inflammatory reactions and activate signaling pathways related to proliferation after intracerebral ***,there is no research showing the relationship between this treatment and cell *** models of intracerebral hemorrhage were established by injecting 60 μL of autologous blood into the right side of the *** hours later,the needle traveled subcutaneously from the Baihui acupoint to Qubin *** needle was alternately rotated（180 ± 10 turns/min） manually along clockwise and counter-clockwise *** lasted for 7 days,and was performed three times each for 6 minutes with 6-minute intervals between *** intraperitoneally receiving Sonic hedgehog pathway activator,purmorphamine（1 mg/kg per day）,served as positive *** and sensory function were assessed using the Ludmila Belayev *** of pathological changes were measured in the perihemorrhagic penumbra using hematoxylin-eosin *** was examined by terminal deoxynucleotidyl transferase（Td T）-mediated d UTP nick end labeling *** of smoothened（Smo） and glioma-associated homolog 1（Gli1） was determined by western blot *** results showed that Baihui-penetrating-Qubin acupuncture promoted recovery of motor and sensory function,reduced the apoptotic cell percentage in the perihemorrhagic penumbra,and up-regulated Smo and Gli1 *** conclude that Baihui-penetrating-Qubin acupuncture can mitigate hemorrhage and promote functional recovery of the brain in a rat model of intracerebral hemorrhage,possibly by activating the Sonic hedgehog pathway.

关键词： nerve regeneration acupuncture treatment intracerebral hemorrhage neurological function Ludmila Belayev test TUNEL assay purmorphamine Smo Ptchl Glil neural regeneration

The Influence of Various Cationic Group on Polynorbornene Based Anion Exchange Membranes with Hydrophobic Large Steric Hindrance Arylene Substituent

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Chinese Journal of Polymer Science 2023年第2期41卷 278-287页

作者： wei Wang Da-Fu Cao xiao-wei sun Li Pan Zhe Ma Yue-Sheng Li Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and EngineeringTianjin UniversityTianjin300350China

A series of brominated polynorbornene derivatives,including bulky steric hydrophobic groups and highly physical and chemical stable backbones,were synthesized via ring-opening metathesis polymerization and post-functionalized with trimethylammonium(QA),N-methylimidazole(Im),N-methylpyrrolidinium(Pyr)or N-methylpiperidinium(Pip)to construct the entire anion exchange membranes(AEMs).Benefited from prominent phase-separated morphology,PBO-x%-y(x=66,68,70;y=QA,Im,Pyr,Pip)AEMs with ion exchange capacity(IEC)approaching 2.0 meq·g^(−1)exhibited super high hydroxide ***,PBO-70%-Pip possessed the highest hydroxide conductivity of 137.3 mS·cm^(−1)at 80℃Moreover,all membranes exhibit low swelling ratio(SR)(the SR of PBO-66%-QA was just 8.6%at 80℃).That is,bulky steric hydrophobic groups play a crucial role in balancing the high hydroxide conductivity and low SR in ***,three AEMs(PBO-66%-QA,PBO-68%-Pyr,PBO-70%-Pip)showed good alkaline stability after immersion into 1.0 mol/L NaOH aqueous solution at 80℃for 480 h without any degradation.

关键词： Anion exchange membrane Steric hindrance Phase separation Ion conductivity Swelling ratio

Liquid-encapsulated quantum dot for enhanced UV and thermal stability of quantum dot color conversion films

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Nano Research 2024年第11期17卷 10127-10133页

作者： Ronghuan Liu Fan Fang Pai Liu Xijian Duan Kai Wang xiao wei sun Institute of Nanoscience and Applications and Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen 518055 China Key Laboratory of Energy Conversion and Storage Technologies (Southern University of Science and Technology) Ministry of Education and Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting Southern University of Science and Technology Shenzhen 518055 China

Encapsulation is a widely recognized method for enhancing the stability of colloidal quantum dots (CQDs). However, traditional encapsulation methods for solid-state materials expose encapsulated CQDs to risks such as ligand loss and poor dispersion. Additionally, these encapsulated CQDs still face the risk of aging due to surface ligand bond breakage under high-energy radiation. In this study, we found that quantum dots in solution exhibited enhanced ultraviolet (UV) tolerance compared to their counterparts in solid form under an inert atmosphere. We attribute this enhancement to improved ligand retention and self-healing of quantum dots in solution. Herein, we introduce a novel method for fabricating liquid-encapsulated quantum dot (LEQD) color conversion films. This technique leverages the self-healing capability of ligands in liquid-state quantum dots to enhance the UV and thermal stability of the quantum dot color conversion films. Experimental results demonstrate that LEQD films exhibit better resistance to UV radiation and high temperatures than solid-encapsulated quantum dot (SEQD) color conversion films. After 400 h of exposure to 100 mW blue light-emitting device (LED) light at 60 °C and 90% humidity, the brightness of LEQD film retained 90% of its initial level. This liquid-state quantum dot encapsulation approach offers a promising pathway for developing more durable quantum dot color conversion films.

关键词： liquid encapsulation quantum dots stability quantum dot color conversion film

Structural,electronic,and magnetic properties of quaternary Heusler CrZrCoZ compounds:A first-principles study

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Chinese Physics B 2020年第7期29卷 464-473页

作者： xiao-Ping wei Tie-Yi Cao xiao-wei sun Qiang Gao Peifeng Gao Zhi-Lei Gao xiao-Ma Tao The School of Mathematics and Physics Lanzhou Jiaotong UniversityLanzhou 730070China Institute of Materials Science Technische Universitat Darmstadt64287 DarmstadtGermany Key Laboratory of Mechanics on Western Disaster and Environment Ministry of EducationCollege of Civil Engineering and MechanicsKey Laboratory of Special Function Materials and Structure Design of Ministry of EducationLanzhou UniversityLanzhou 730000China School of Physical Science and Technology Guangxi UniversityNanning 530004China

Using the first-principles calculations,we study the structural,electronic,and magnetic properties along with exchange interactions and Curie temperatures for CrZrCoZ(Z=Al,Ga,In,Tl,Si,Pb)quaternary Heusler *** results show that the CrZrCoZ alloys are half-metallic ferrimagnets,and their total spin magnetic moments,which are mainly carried by the Cr atom,obey the Slater-Pauling *** of local density of states confirms that the exchange splitting between eg and t2g states leads to the formation of half-metallic *** to the calculated Heisenberg exchange coupling parameters,it is found that the Cr(A)-Cr(A)and Cr(A)-Zr(B)exchanges dominate the appearance of ferrimagnetic states in CrZrCoZ(Z=Al,Ga,In,Tl,Pb)alloys,and it is the Cr(A)-Zr(B)and Zr(B)-Zr(B)exchanges for CrZrCoSi ***,we estimate the Curie temperatures of CrZrCoZ by using mean-field approximation,it is found that the CrZrCoZ(Z=Al,Ga,In,Tl,Pb)alloys have noticeably higher Curie temperatures than room ***,we expect that the CrZrCoZ alloys are promising candidates in spintronic applications in future.

关键词： quaternary Heusler alloys electronic structure magnetic properties Curie temperature

Acupuncture inhibits Notch1 and Hes1 protein expression in the basal ganglia of rats with cerebral hemorrhage

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Neural Regeneration Research 2015年第3期10卷 457-462页

作者： wei Zou Qiu-xin Chen xiao-wei sun Qing-bin Chi Hong-yu Kuang Xue-ping Yu xiao-hong Dai Third Department of Acupuncture First Affiliated HospitalHeilongjiang University of Chinese Medicine Heilongjiang University of Chinese Medicine Department of Endocrinology First Affiliated HospitalHarbin Medical University

Notch pathway activation maintains neural stem cells in a proliferating state and increases nerve repair capacity. To date, studies have rarely focused on changes or damage to signal transduc- tion pathways during cerebral hemorrhage. Here, we examined the effect of acupuncture in a rat model of cerebral hemorrhage. We examined four groups： in the control group, rats received no treatment. In the model group, cerebral hemorrhage models were established by infusing non-hep-arinized blood into the Brain. In the acupuncture group, modeled rats had Baihui （DU20） and Qubin （GBT） acupoints treated once a day for 30 minutes. In the DAPT group, modeled rats had 0.15 μg/mL DAPT solution （10 mL） infused into the brain. Immunohistochemistry and western blot results showed that acupuncture effectively inhibits Notch 1 and Hesl protein expression in rat basal ganglia. These inhibitory effects were identical to DAPT, a Notch signaling pathway inhibitor. Our results suggest that acupuncture has a neuroprotective effect on cerebral hemorrhage by in- hibiting Notch-Hes signaling pathway transduction in rat basal ganglia after cerebral hemorrhage.

关键词： nerve regeneration acupuncture cerebral hemorrhage immunohistochemistry westernblot assay Notch 1 lIes l rats DAPT neural stem cells NSFC grant neural regeneration

Strong circularly polarized luminescence from quantum dots/2D chiral perovskites composites

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Nano Research 2023年第5期16卷 7593-7599页

作者： Qingqian Wang Hongmei Zhu wei Chen Junjie Hao Zhaojin Wang Jun Tang Yingguo Yang xiao wei sun Dan Wu Kai Wang Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China College of Engineering Physics Shenzhen Technology UniversityShenzhen 518118China College of New Materials and New Energies Shenzhen Technology UniversityShenzhen 518118China Shanghai Advanced Research Institute Chinese Academy of ScienceShanghai 201210China

Chiral perovskites(CPs)have attracted enormous attentions since they have combined chirality and optoelectrical properties well which is promising in circularly polarized luminescence(CPL)application and of great importance for future ***,there is a key contradiction that in chiral perovskites chirality distorts the crystal structure,leading to poor photoluminescence(PL)*** the balance between chirality and PL is a major challenge for strong CPL from chiral ***,two-dimensional(2D)chiral perovskite has shown fascinating chiral induced spin selectivity(CISS)effect which can act as spin injector under ambient ***,we propose an effective strategy to achieve high CPL activity generated from quantum dots(QDs)by introducing 2D chiral perovskite as a chiral source,providing spin polarized carriers through the CISS *** as-synthesized QDs/CP composites exhibit dissymmetry factors(glum)up to 9.06×10^(−3).For the first time,we performed grazing incident wide angle X-ray scattering(GIWAXS)measurements,showing the chirality originates from the distorted lattices caused by the large chiral organic ***,time-resolved PL(TR-PL)measurements verify the enhanced CPL activity should be attributed to the charge transport between two *** findings provide a useful method to achieve CPL in QDs/2D chiral perovskite heterojunctions which could be promising in spinoptoelectronics application.

关键词： circularly polarized luminescence colloidal quantum dots two-dimensional(2D)chiral perovskites grazing incident wide angle X-ray scattering(GIWAXS) chiral induced spin selectivity

Pneumocystis jiroveci pneumonia after total hip arthroplasty in a dermatomyositis patient:A case report

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World Journal of Clinical Cases 2022年第10期10卷 3313-3320页

作者： Mao Hong Zi-Yu Zhang xiao-wei sun wei-Guo Wang Qi-Dong Zhang Wan-Shou Guo Beijing University of Chinese Medicine Beijing 100029China Department of Orthopaedic Surgery Beijing Key Lab Immune-Mediated Inflammatory DiseasesChina-Japan Friendship HospitalBeijing 100029China Graduate School of Peking Union Medical College Chinese Academy of Medical SciencesBeijing 100029China

BACKGROUND Pneumocystis jiroveci pneumonia(PJP)is a serious opportunistic infection that occurs mostly in patients with immunodeficiency and long-term immunosuppressive *** non-human immunodeficiency virus-infected patients,the most important risk factor for PJP is the use of glucocorticoids in combination with other immunosuppressive *** management of glucocorticoids during the perioperative period in patients with dermatomyositis requires special *** SUMMARY We report a case of PJP in the perioperative period.A 61-year-old woman with a history of anti-melanoma differentiation-associated gene 5(MDA5)-positive dermatomyositis and interstitial pneumonia was administered with long-term oral methylprednisolone and *** patient underwent right total hip arthroplasty in the orthopaedic department for bilateral osteonecrosis of the femoral *** was given intravenous drip hydrocortisone before anesthesia and on the first day after surgery and resumed oral methylprednisolone on the second postoperative *** the fifth day after surgery,the patient suddenly developed *** computed tomography scan showed diffuse grid shadows and ground glass shadows in both *** chain reaction testing of bronchoalveolar lavage fluid was positive for Pneumocystis *** patient was eventually diagnosed with PJP and was administered with oral *** the 6-mo review,there was no recurrence or *** Continued perioperative glucocorticoid use in patients with anti-MDA5-positive dermatomyositis may increase the risk of PJP.

关键词： Pneumocystis jiroveci pneumonia Glucocorticoids Perioperative period Dermatomyositis Hypothalamic-pituitary-adrenal axis Case report