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cesium lead halide perovskite triangular nanorods as high-gain medium and effective cavities for multiphoton- pumped lasing

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Nano Research 2017年第10期10卷 3385-3395页

作者： Xiaoxia Wang Hong Zhou Shuangping Yuan Weihao Zheng Ying Jiang Xiujuan Zhuang Hongjun Liu Qinglin Zhang Xiaoli Zhu Xiao Wang Anlian Pan School of Physics and Electronics Key Laboratory for Micro-Nano Physics and Technology of Hunan Province and State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan University Changsha 410082 China Institute of Physical and Theoretical Chemistry University of Tübingen Aufder Morgenstelle 18 72076 Tübingen Germany

High-performance multiphoton-pumped lasers based on cesium lead halide perovskite nanostructures are promising for nonlinear optics and practical frequency upconversion devices in integrated photonics. However, the performance of such lasers is highly dependent on the quality of the material and cavity, which makes their fabrication challenging. Herein, we demonstrate that cesium lead halide perovskite triangular nanorods fabricated via vapor methods can serve as gain media and effective cavities for multiphoton-pumped lasers. We observed blue-shifts of the lasing modes in the excitation fluence-dependent lasing spectra at increased excitation powers, which fits well with the dynamics of Burstein-Moss shifts caused by the band filling effect. Moreover, efficient multiphoton lasing in CsPbBr3 nanorods can be realized in a wide excitation wavelength range （700-1,400 nm）. The dynamics of multiphoton lasing were investigated by time-resolved photoluminescence spectroscopy, which indicated that an electron-hole plasma is responsible for the multiphoton-pumped lasing. This work could lead to new opportunities and applications for cesium lead halide perovskite nanostructures in frequency upconversion lasing devices and optical interconnect systems.

关键词： cesium lead halide perovskite nanorods triangular cross-section multiphoton-pumped laser time-resolved photoluminescence

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Long-lasting photoluminescence quantum yield of cesium lead halide perovskite-type quantum dots

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Frontiers of Chemical Science and Engineering 2021年第1期15卷 187-197页

作者： Yonghyun Kim Huiwen Liu Yi Liu Boa Jin Hao Zhang Wenjing Tian Chan Im Department of Chemistry Konkuk UniversitySeoul 05029Korea State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China

cesium lead halide perovskite(CsPbX_(3),X=Cl,Br,I)quantum dots(QDs)and their partly Mn^(2+)-substituted QDs(CsPb1–xMnxX3)attract considerable attention owing to their unique photoluminescence(PL)*** two types of QDs,having different PL decay dynamics,needed to be further investigated in a form of aggregates to understand their solid-state-induced exciton dynamics in conjunction with their behaviors upon degradation to achieve practical applications of those promising ***,thus far,these QDs have not been sufficiently investigated to obtain deep insights related to the long-term stability of their PL properties as aggregated ***,in this study,we comparatively examined CsPbX_(3)-and CsPb1–xMnxX_(3)-type QDs stocked for>50 d under dark ambient conditions by using excitation wavelength-dependent PL quantum yield and time-resolved PL *** investigations were performed with powder samples in addition to solutions to determine the influence of the inter-QD interaction of the aged QD aggregates on their radiative *** turns out that the Mn^(2+)-substituted QDs exhibited long-lasting PL quantum efficiencies,while the unsubstituted CsPbX_(3)-type QDs exhibited a drastic reduction of their PL *** the obtained PL traces were clearly sensitive to the sample *** is discussed with the possible interaction depending on the size and distance of the QD aggregates.

关键词： quantum dots cesium lead halide perovskite time-resolved photoluminescence PL quantum yield QD aggregates

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Oriented inorganic perovskite absorbers processed by colloidal-phase fumigation

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Science China Materials 2021年第10期64卷 2421-2429页

作者： Ziren Zhou Hong Wei Qiao Xiaolong Li Chen Lin Jin Xie Yiheng Shi Zeqing Lin Bing Ge Mengjiong Chen Yi Zheng Jin Shuang Yang Yu Hou Hua Gui Yang Key Laboratory for Ultrafine Materials of Ministry of Education Shanghai Engineering Research Center of Hierarchical NanomaterialsSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204China Department of Chemistry Zhejiang UniversityHangzhou 310058China

Inorganic perovskite absorbers are promising candidates for next-generation photovoltaics due to their good thermal and light ***-mixed Cs Pb I_(x)Br_(3-x)reach a compromise between its structural tolerance and absorption edge,yet the power conversion efficiencies(PCEs)of the asfabricated cells can be considerably limited by the nonideal quality of solution-processed *** we demonstrated a fumigation strategy on colloidal perovskite films using dualO-donor ethyl acetate(EA).By in-situ monitoring this stage with grazing-incidence wide-angle X-ray scattering technology,we reveal that EA fumigation would impose ripening barrier on colloidal inorganic perovskites and hence slow down the nucleation rate,leading to an intermediate state for processing high-crystallinity and oriented perovskite films with improved photophysical *** optimized PCE of 16.6%was finally yielded upon wide-bandgap(1.9 eV)perovskite absorber.

关键词： cesium lead halide perovskite fumigation orientation photophysical properties solar cells

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