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Nano Research 2024年第7期17卷 6534-6543页

作者： ya-chuan liang Qing Cao Yuan Deng Yong Wang Kai-Kai Liu Chong-Xin Shan School of Electronics and Information Zhengzhou University of Light IndustryZhengzhou 450002China Henan Key Laboratory of Diamond Optoelectronic Material and Devices Key Laboratory of Material PhysicsMinistry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450001China Academy for Quantum Science and Technology Zhengzhou University of Light IndustryZhengzhou 450002China Institute of Quantum Materials and Physics Henan Academy of SciencesZhengzhou 450046China

Easy non-radiative decay property of long-lived triplet excitons in aqueous solution obstructs their applications in aquatic *** reported phosphorescence phenomena in aqueous solution have excited researchers enormously but achieving full-color water-soluble phosphorescent carbon nanodots(CNDs)is still a challenging ***,full-color phosphorescence of water-soluble CNDs has been demonstrated by triggering their triplet excitons through nanospace domain confinement,and Förster energy resonance transfer is used for further tuning phosphorescence *** phosphorescence spans across most of the visible spectrum,ranging from 400 to 700 *** an aqueous solution,the CNDs exhibits blue,green,and red phosphorescence,lasting for approximately 6,10,and 7 s,***,the phosphorescence quantum yields are 11.85%,8.6%and 3.56%,making them readily discernible to the naked eyes and laying a solid foundation for practical ***,phosphorescence flexible optical display and bioimaging have been demonstrated by using the multicolor CNDs-based nanomaterials,showing distinct superiority for accuracy and complete display and imaging in complex emission background.

关键词： carbon nanodots triplet excitons multicolor aqueous solution

Silica encapsulated ZnO quantum dot-phosphor nanocomposites:Sol-gel preparation and white light-emitting device application

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Chinese Physics B 2018年第7期27卷 548-555页

作者： ya-chuan liang Kai-Kai Liu Ying-Jie Lu Qi Zhao Chong-Xin Shan School of Physics and Engineering Zhengzhou UniversityZhengzhou 450001China State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

ZnO quantum dots （QDs） as an eco-friendly and low-cost material has bright fluorescence, which makes it promising material for healthy lighting and displaying. However, the low fluorescence efficiency and poor stability of ZnO QDs impede their applications in lighting application. In this work, silica encapsulated ZnO QD-phosphors nanocomposites （ZSPN） have been prepared through a sol-gel synthesis process, where yellow-emitting ZnO QDs and blue-emitting BaMgAl10O17：Eu2＋ are employed as the luminescence cores and silica as link between two luminescence materials. Tunable photoluminescence of ZSPN and the white light emission have been achieved through changing mass ratio of both of ZnO QDs and commercial phosphors. The PLQY of the ZSPN can reach 63.7% and they can maintain high luminous in- tensity even the ambient temperature up to 110 ℃ and after 35 h of UV irradiation. In addition, they can keep stable for 40 days. By coating the ZSPN phosphors onto a ultraviolet chip, WLEDs with luminous efficiency of 73.6 lm/W and the color coordinate, correlated color temperature, and color rendering index can reach （0.32, 0.34）, 5580 K, and 87, respectively, indicating the bright prospect of the ZSPN phosphors used in healthy lighting.

关键词： ZnO QD-phosphors nanocomposites (ZSPN) phosphors light-emitting diodes

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Water-induced ultralong room temperature phosphorescence by constructing hydrogen-bonded networks

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Nano Research 2020年第3期13卷 875-881页

作者： ya-chuan liang Yuan Shang Kai-Kai Liu Zhen Liu Wen-Jie Wu Qian Liu Qi Zhao Xue-Ying Wu Lin Dong Chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices School of Physics and EngineeringZhengzhou UniversityZhengzhou 450052China Super Computer Center Smart City InstituteZhengzhou UniversityZhengzhou 4500052China The college of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 4500052China

Room temperature phosphorescence(RTP)materials show potential applications in information security and optoelectronic devices,but it is still a challenge to achieve RTP in organic materials under water ambient due to the unstable property of triplet ***,water-induced RTP has been demonstrated in the organic microrod(OMR).Noting that the RTP intensity of the as-prepared OMR is greatly enhanced when water is introduced,and the reason for the enhancement can be attributed to the formation of hydrogen-bonded networks inside the *** hydrogen-bonded networks can confine the molecular motion effectively,leading to the stability of triplet states;thus the lifetime of the OMR can reach 1.64 s after introducing *** virtue of the long lifetime of the OMR in the presence of water,multilevel data encryption based on the OMR has been demonstrated.

关键词： water-induced phosphorescence triplet states hydrogen-bonded networks

Ultraviolet phosphorescent carbon nanodots

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Light(Science & Applications) 2022年第6期11卷 1274-1284页

作者： Shi-Yu Song Kai-Kai Liu Qing Cao Xin Mao Wen-Bo Zhao Yong Wang ya-chuan liang Jin-Hao Zang Qing Lou Lin Dong Chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic Material and Devices Key Laboratory of Material PhysicsMinistry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450001China

Phosphorescent carbon nanodots(CNDs)have generated enormous interest recently,and the CND phosphorescence is usually located in the visible region,while ultraviolet(UV)phosphorescent CNDs have not been reported thus ***,the UV phosphorescence of CNDs was achieved by decreasing conjugation size and in-situ spatial confinement in a NaCNO *** electron transition from the P_(x) to the sp^(2) orbit of the N atoms within the CNDs can generate one-unit orbital angular momentum,providing a driving force for the triplet excitons population of the *** confinement caused by the NaCNO crystal reduces the energy dissipation paths of the generated triplet *** further tailoring the size of the CNDs,the phosphorescence wavelength can be tuned to 348 nm,and the room temperature lifetime of the CNDs can reach 15.8 *** a demonstration,the UV phosphorescent CNDs were used for inactivating gram-negative and gram-positive bacteria through the emission of their high-energy photons over a long duration,and the resulting antibacterial efficiency reached over 99.9%.This work provides a rational design strategy for UV phosphorescent CNDs and demonstrates their novel antibacterial applications.

关键词： rational ultraviolet lifetime

Experimental investigation on pyrolysis products and pore structure characteristics of organic-rich shale heated by supercritical carbon dioxide

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Petroleum Science 2024年第4期21卷 2393-2406页

作者： Bai-Shuo Liu chuan-Jin yao Jia-Long Qi ya-Qian Liu liang Xu Jing-Xuan Hou State Key Laboratory of Deep Oil and Gas China University of Petroleum (East China) Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)) Ministry of Education School of Petroleum Engineering China University of Petroleum (East China)

The efficient pyrolysis and conversion of organic matter in organic-rich shale,as well as the effective recovery of pyrolysis shale oil and gas,play a vital role in alleviating energy *** state of carbon dioxide（CO2） in the pyrolysis environment of shale reservoirs is the supercritical *** unique supercritical fluid properties not only effectively heat organic matter,displace pyrolysis products and change shale pore structure,but also achieve carbon storage to a certain *** samples were made into powder and three sizes of cores,and nitrogen（N2） and supercritical carbon dioxide（ScCO2）pyrolysis experiments were performed at different final pyrolysis *** properties and mineral characteristics of the pyrolysis products were studied based on gas chromatography analysis,Xray diffraction tests,and mass spectrometry ***,the pore structure characteristics at different regions of cores before and after pyrolysis were analyzed using N2adsorption tests to clarify the impact of fracturing degree on the pyrolysis *** results indicate that the optimal pyrolysis temperature of Longkou shale is about 430℃.Compared with N2,the oil yield of ScCO2pyrolysis is *** pyrolysis oil obtained by ScCO2extraction has more intermediate fractions and higher relative molecular *** ScCO2can effectively improve the pore diameter of shale and its effect is better than that of *** micropores are produced in shale after pyrolysis,and the macropores only are generated in ScCO2pyrolysis environments with temperatures greater than 430℃.The pore structure has different development characteristics at different pyrolysis temperatures,which are mainly affected by the pressure holding of volatile matter and products *** to the surface of the core,the pore development effect inside the core is *** the decrease in core size,the pore diameter,specific surface area,and pore volume of cores all increase after pyrolysis.

关键词： Organic-rich shale Supercritical carbon dioxide In-situ pyrolysis Pore structure Core size and region

Water-induced MAPbBr_(3)@PbBr(OH) with enhanced luminescence and stability

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Light(Science & Applications) 2020年第1期9卷 1598-1608页

作者： Kai-Kai Liu Qian Liu Dong-Wen yang ya-chuan liang Lai-Zhi Sui Jian-Yong Wei Guo-Wei Xue Wen-Bo Zhao Xue-Ying Wu Lin Dong Chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Material PhysicsMinistry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of Sciences457 Zhongshan RoadDalian 116023China

Poor stability has long been one of the key issues that hinder the practical applications of lead-based halide *** this paper,the photoluminescence(PL)quantum yield(QY)of bromide-based perovskites can be increased from 2.5% to 71.54% by introducing water,and the PL QY of a sample in aqueous solution decreases minimally over 1 *** enhanced stability and PL QY can be attributed to the water-induced methylamino lead bromide perovskite(MAPbBr_(3))@PbBr(OH).We note that this strategy is universal to MAPbBr_(3),formamidine lead bromide perovskite(FAPbBr_(3)),inorganic lead bromide perovskite(CsPbBr_(3)),***-emitting devices(LEDs)are fabricated by using the as-prepared perovskite as phosphors on a 365 nm UV *** luminance intensity of the LED is 9549 cd/m^(2) when the driven current is 200 mA,and blemishes on the surface of glass are clearly observed under the illumination of the *** work provides a new strategy for highly stable and efficient perovskites.

关键词： perovskite stability luminescence

Near-infrared carbon nanodots for effective identification and inactivation of Gram-positive bacteria

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Nano Research 2022年第3期15卷 1699-1708页

作者： Wen-Bo Zhao Rui-Ting Wang Kai-Kai Liu Meng-Ru Du Yong Wang Yu-Qi Wang Rui Zhou ya-chuan liang Ruo-Nan Ma Lai-Zhi Sui Qing Lou Lin Hou Chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Materials PhysicsMinistry of Educationand School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China School of Pharmaceutical Sciences Key Laboratory of Targeting Therapy and Diagnosis for Critical DiseasesCollaborative Innovation Center of New Drug Research and Safety EvaluationZhengzhou UniversityZhengzhou 450001China Henan Key Laboratory of Ion-beam Bioengineering School of Agricultural ScienceZhengzhou UniversityZhengzhou 450052China State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

An unacceptable increase in antibacterial resistance has arisen due to the abuse of multiple classes of broad-spectrum ***,it is significant to develop new antibacterial agents,especially those that can accurately identify and kill specific ***,we demonstrate a kind of perilla-derived carbon nanodots(CNDs),integrating intrinsic advantages of luminescence and photodynamic,providing the opportunity to accurately identify and kill specific *** CNDs have an exotic-doped andπ-conjugated core,vitalizing them near-infrared(NIR)absorption and emission properties with photoluminescence quantum yield of 21.1%;hydrophobic chains onto the surface of the CNDs make them to selectively stain Gram-positive bacteria by insertion into their *** to the strong absorption in NIR region,reactive oxygen species are in situ generated by the CNDs onto bacterial membranes under 660 nm irradiation,and 99.99%inactivation efficiency against Gram-positive bacteria within 5 min can be *** vivo results demonstrate that the CNDs with photodynamic antibacterial property can eliminate the inflammation of the area affected by methicillin-resistant Staphylococcus aureus(MRSA),and enabling the wound to be cured quickly.

关键词： carbon nanodots near-infrared emission specific identification anti-bacteria photodynamic therapy

Self-exothermic reaction driven large-scale synthesis ofphosphorescent carbon nanodots

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Nano Research 2021年第7期14卷 2231-2240页

作者： Shi-Yu Song Lai-Zhi Sui Kai-Kai Liu Qing Cao Wen-Bo Zhao ya-chuan liang Chao-Fan Lv Jin-Hao Zang Yuan Shang Qing Lou Xi-Gui yang Lin Dong Kai-Jun Yuan Chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of Sciences457 Zhongshan RoadDalian 116023China Super Computer Center Smart City InstituteZhengzhou UniversityZhengzhou 450001China

Phosphorescent carbon nanodots(CNDs)have various attractive properties and potential applications,but it remains a formidable challenge to achieve large-scale phosphorescent CNDs limited by current ***,a large-scale synthesis method for phosphorescent CNDs has been demonstrated via precursors’self-exothermic reaction at room *** as-prepared CNDs show fluorescence and phosphorescence property,which are comparable with that synthesized by solvothermal and microwave *** and computational studies indicate that exotic atom doped sp^(2) hybridized carbon core works as an emissive center,which facilities the intersystem crossing from singlet state to triplet *** CNDs show phosphorescence with tunable lifetimes from 193 ms to 1.13 s at different *** demonstration of large-scale synthesis of phosphorescent CNDs at room temperature opens up a new window for room temperature fabrication phosphorescent CNDs.

关键词： carbon nanodots phosphorescence large scale self-exothermic reaction

Analysis of the one-decoy-state SARG04 quantum cryptography protocol in the presence of afterpulse effects

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Communications in Theoretical Physics 2024年第6期76卷 66-71页

作者： Hu Nian ya-Feng Nie Chun-Mei Zhang liang-liang Lu Key Laboratory of Optoelectronic Technology of Jiangsu Province School of Physical Science and TechnologyNanjing Normal UniversityNanjing 210023China Institute of Quantum Information and Technology Nanjing University of Posts and TelecommunicationsNanjing 210003China Hefei National Laboratory Hefei 230088China

The SARG04 quantum key distribution protocol can offer greater robustness against photon number splitting attacks than the BB84 protocol that is implemented with weak *** this paper,we propose a tight key analysis for the SARG04 protocol,by considering the one-decoy method and investigating its performance under the influence of a detector *** results demonstrate that an increase in block size leads to a slight increase in both the secure key rate and the maximum transmission ***,the detector afterpulse plays a crucial role in practical applications and has a more pronounced effect on the SARG04 protocol compared to the BB84 protocol.

关键词： Quantum key distribution SARG04 protocol one decoy afterpulse

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On a Flexible Loan Repayment Method Depending on Borrower's Asset with an Early Termination Clause

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Acta Mathematicae Applicatae Sinica 2024年第2期40卷 557-567页

作者： Jin liang Jia-qi MAO Zhao-ya LIU School of Mathematical Sciences Tongji UniversityShanghai 200092China

Aiming at the problem that the asset’s fluctuation influences the borrower’s repayment ability,a loan with a new and flexible repayment method is designed,which depends on the asset value of the *** repayment method can reduce the loan default probability,but it causes the uncertainty of the pay off *** the repayment term is related to the regular repayment amount in this method,a boundary for the regular repayment amount is set up in order to avoid too long repayment *** will balance the benefit of borrowers and lenders and improve the applicability of this *** establishing a mathematical model of the residual value of the loan,this model can be transformed into an initial-boundary problem of a partial differential *** analytic solution and the expected time to pay off the loan are ***,numerical analysis are shown.

关键词： flexible repayment method repayment ratio early termination clause expected pay off time

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