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学者姓名：张新平
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Abstract ：
Vanadium dioxide (VO2), renowned for its reversible metal-to-insulator transition (MIT), has been widely used in configurable photonic and electronic devices. Precisely tailoring the MIT of VO2 on micro-/nano-scale is crucial for miniaturized and integrated devices. However, existing tailoring techniques like scanning probe microscopy, despite their precision, fall short in efficiency and adaptability, particularly on complex or curved surfaces. Herein, this work achieves the local engineering of the phase of VO2 films in high efficiency by employing laser writing to assist in the hydrogen doping or dedoping process. The laser doping and laser dedoping technique is also highly flexible, enabling the fabrication of reconfigurable, non-volatile, and multifunctional VO2 devices. This approach establishes a new paradigm for creating reconfigurable micro/nanophotonic and micro/nanoelectronic devices.
Keyword ：
phase transition phase transition laser doping and dedoping laser doping and dedoping vanadium dioxide vanadium dioxide infrared camouflage infrared camouflage memristor memristor
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| GB/T 7714 | Ma, He , Li, Yuan , Hao, Jianhua et al. Selective Laser Doping and Dedoping for Phase Engineering in Vanadium Dioxide Film [J]. | SMALL METHODS , 2024 . |
| MLA | Ma, He et al. "Selective Laser Doping and Dedoping for Phase Engineering in Vanadium Dioxide Film" . | SMALL METHODS (2024) . |
| APA | Ma, He , Li, Yuan , Hao, Jianhua , Wu, Yonghuang , Shi, Run , Peng, Ruixuan et al. Selective Laser Doping and Dedoping for Phase Engineering in Vanadium Dioxide Film . | SMALL METHODS , 2024 . |
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Abstract ：
Quasi-2D perovskites are widely used in solar cells, photodetectors, and light-emitting diodes (LEDs) due to their excellent optoelectronic properties and stability. However, much fewer all-optical devices are realized based on quasi-2D perovskites. Although perovskites have large nonlinear optical coefficients, the relaxation progress of excitons and carriers will slow down the response time and reduce the signal contrast of the all-optical devices. In this paper, the exciton dynamics are investigated under off-resonance excitation in quasi-2D perovskite PEA2(FAPbBr3)2PbBr4. The spin-selective optical Stark effect (OSE) is observed through circularly polarized transient absorption measurements, and a Stark shift of 3.3 meV is achieved under 1.11 eV excitation. The hot-biexciton cooling process induced by two-photon absorption is also observed. A spin-based XNOR gate is demonstrated with a response time of approximate to 180 fs, and the logical signal contrast is enhanced through the competition of the OSE and the hot-biexciton effect.
Keyword ：
optical stark effect optical stark effect hot-biexciton effect hot-biexciton effect two-photon absorption two-photon absorption low dimensional low dimensional optical logic gates optical logic gates
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| GB/T 7714 | Fu, Yulan , Zhang, Yi , Zhang, Yiwei et al. Ultrafast All-Optical Logic Gates in Quasi-2D Perovskites [J]. | ADVANCED OPTICAL MATERIALS , 2024 . |
| MLA | Fu, Yulan et al. "Ultrafast All-Optical Logic Gates in Quasi-2D Perovskites" . | ADVANCED OPTICAL MATERIALS (2024) . |
| APA | Fu, Yulan , Zhang, Yi , Zhang, Yiwei , Wang, Jiawei , Zhang, Baohuan , Feng, Shifeng et al. Ultrafast All-Optical Logic Gates in Quasi-2D Perovskites . | ADVANCED OPTICAL MATERIALS , 2024 . |
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Abstract ：
The advancement of Eu2+-activated luminescent materials tailored to exhibit a range of properties is crucial for addressing the specific demands of various application fields. However, the lack of suitable lattice sites in numerous compounds for stable Eu2+ incorporation restricts their potential for diverse optical properties. Herein, a facile strategy of carbon and hydrogen coreduction utilizing graphite crucibles is proposed to effectively achieve the impressive luminescence of Eu2+ at trivalent Y sites in Rb3Y(PO4)(2):Eu phosphors. Rb3Y(PO4)(2):Eu exhibits blue-violet emission when Eu2+ predominantly occupies the Rb1 and Rb2 sites. Inspiringly, by facilitating the reduction of more Eu3+ to Eu2+, a yellow emission band at 550 nm arising from Eu2+ at Y sites emerges, enabling the realization of single-component white-emitting and yellow-emitting Rb3Y(PO4)(2):Eu phosphors. The diverse luminescent properties of Rb3Y(PO4)(2):Eu expand its potential applications in different white light source devices and optical thermometry. This work presents an innovative synthetic strategy to develop remarkable Eu2+ luminescence at trivalent cation sites, thereby broadening the optical properties of the material and enabling multifunctional applications.
Keyword ：
Eu2+ luminescence Eu2+ luminescence phosphor phosphor carbon and hydrogen coreduction carbon and hydrogen coreduction solid-state lighting solid-state lighting optical thermometry optical thermometry
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| GB/T 7714 | Zhao, Ming , Ge, Yeping , Li, Yurong et al. Achieving Eu2+ Luminescence at Trivalent Lattice Site in Rb3Y(PO4)2:Eu toward Multicolor Emissions by Carbon and Hydrogen Coreduction [J]. | ADVANCED FUNCTIONAL MATERIALS , 2024 . |
| MLA | Zhao, Ming et al. "Achieving Eu2+ Luminescence at Trivalent Lattice Site in Rb3Y(PO4)2:Eu toward Multicolor Emissions by Carbon and Hydrogen Coreduction" . | ADVANCED FUNCTIONAL MATERIALS (2024) . |
| APA | Zhao, Ming , Ge, Yeping , Li, Yurong , Song, Xiaoyan , Zhang, Xinping . Achieving Eu2+ Luminescence at Trivalent Lattice Site in Rb3Y(PO4)2:Eu toward Multicolor Emissions by Carbon and Hydrogen Coreduction . | ADVANCED FUNCTIONAL MATERIALS , 2024 . |
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Abstract ：
A degenerated four-wave-mixing (FWM) process in single-crystal (CH3NH3)PbBr3 (MAPbBr(3)) is reported, where 150-fs laser pulses at 1.33 mu m are employed as the pump. Two pump photons interact with a single crystal, producing another two photons with higher and lower energies, respectively. One of the FWM-generation sidebands is tuned from similar to 1.23 to 1.21 mu m and the other from similar to 1.43 to 1.48 mu m for the center wavelength, as the pump fluence is increased from 2.6 to 11.69 mJ cm(-2). The self-phase modulation induced by the strong pump pulses through the optical Kerr effect is responsible for the tuning dynamics. Transient spectroscopy not only verifies the FWM scheme for the interacting waves but also reveals the interference dynamics between the FWM-generated sidebands and the probe pulse. In particular, the angular dependence of the FWM generation supplies direct evidence for the phase-matching geometry. Using experimental data, a nonlinear refractive index coefficient of 1.19 x 10(-14) cm(2) W-1 at 1.33 mu m for single-crystal MAPbBr(3) is determined.
Keyword ：
self-phase modulation self-phase modulation ultrafast four-wave mixing ultrafast four-wave mixing optical nonlinear refractive index optical nonlinear refractive index transient spectroscopy transient spectroscopy single-crystal hybrid perovskite single-crystal hybrid perovskite
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| GB/T 7714 | Ren, Jiahui , Zhang, Xinping . Ultrafast Four-Wave Mixing Phase-Matched by Transient Nonlinear Phase Modulation in a MAPbBr3 Single Crystal [J]. | LASER & PHOTONICS REVIEWS , 2024 . |
| MLA | Ren, Jiahui et al. "Ultrafast Four-Wave Mixing Phase-Matched by Transient Nonlinear Phase Modulation in a MAPbBr3 Single Crystal" . | LASER & PHOTONICS REVIEWS (2024) . |
| APA | Ren, Jiahui , Zhang, Xinping . Ultrafast Four-Wave Mixing Phase-Matched by Transient Nonlinear Phase Modulation in a MAPbBr3 Single Crystal . | LASER & PHOTONICS REVIEWS , 2024 . |
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Abstract ：
Phase control of random lasing processes has been a challenge both in physics and in the device/materials design. Although conventional saturable absorbers can be integrated with random lasers to conceive mode-locking scheme, low intensity and random directions of the lasing radiation reduce largely the possibility. In such considerations, we put forth a new mode-locking mechanism, which is defined as cascaded absorption and stimulated emission (CASE), and have it achieved in multicrystalline microdisk structures of a hybrid perovskite. This scheme applies only to lasing materials with strong overlap between the absorption and emission spectra. In this work, we employed 2-photon pumping at 800 nm with a pulse duration of about 150 fs to realize phase-locked random lasing in MAPbBr3 microdisks in donut shapes, which are produced by micro-imprinting using a flexibly transferred template of tricyclo[5.2.1.02,6] decanedimethanol diacrylate. The phase-locking performance is identified by the narrow-band lasing lines with equal separations. The constant phase shift for initializing phase locking is determined by the internal conversion lifetime in the MAPbBr3 molecules. Two-photon pumping enables large penetration depth into the microdisks and consequently large numbers of phase-locked lasing modes, producing much narrowed and high-contrasted spectral lines. Lasing lines with a bandwidth as narrow as 0.26 to 0.3 nm and an equal separation ranging from 1.7 to 4.8 nm have been achieved for different microdisk schemes. These results imply marked progress in new random lasing physics and potential applications in ultrafast laser technology.
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| GB/T 7714 | Zhang, Qin , Liu, Yue , Zhang, Yi et al. Two-Photon Pumped Phase Locking of Random Lasers in Hybrid Perovskite Multi-Crystalline Microdisks [J]. | ULTRAFAST SCIENCE , 2024 , 4 . |
| MLA | Zhang, Qin et al. "Two-Photon Pumped Phase Locking of Random Lasers in Hybrid Perovskite Multi-Crystalline Microdisks" . | ULTRAFAST SCIENCE 4 (2024) . |
| APA | Zhang, Qin , Liu, Yue , Zhang, Yi , Zhang, Yuxin , Guo, Jinxin , Zhang, Yiwei et al. Two-Photon Pumped Phase Locking of Random Lasers in Hybrid Perovskite Multi-Crystalline Microdisks . | ULTRAFAST SCIENCE , 2024 , 4 . |
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Abstract ：
We report a thin-film optical amplifier integrated on a fiber facet based on polymer-coated distributed feedback (DFB) microcavities, which are fabricated on a planar substrate and then transferred onto fiber tips by means of a flexible transfer technique. The amplified light directly couples into the fiber and is detected when coupled out at the other end after propagating along the fiber for about 20 cm. A prominently amplification factor of about 4.33 at 578.57 nm is achieved by sending supercontinuum pulses into the hundreds of micrometers' DFB microcavities along the normal direction, which is also the axis direction of the fiber. The random distortions of grating lines generated during the transfer process result in a larger amplification spectral range and a less strict polarization dependence for injected light. Benefitting from the device size of hundreds of micrometers and the ease of integration, polymer amplifiers based on DFB microcavities demonstrate significant application potentials in optical communication systems and miniaturized optical devices.
Keyword ：
thin-film amplifier thin-film amplifier optical microcavity optical microcavity distributed feedback distributed feedback fiber fiber polymer polymer
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| GB/T 7714 | Wang, Meng , Xu, Zhuangzhuang , Ren, Yaqi et al. An Organic Microcavity Laser Amplifier Integrated on the End Facet of an Optical Fiber [J]. | NANOMATERIALS , 2024 , 14 (15) . |
| MLA | Wang, Meng et al. "An Organic Microcavity Laser Amplifier Integrated on the End Facet of an Optical Fiber" . | NANOMATERIALS 14 . 15 (2024) . |
| APA | Wang, Meng , Xu, Zhuangzhuang , Ren, Yaqi , Bai, Xiaolei , Zhang, Xinping . An Organic Microcavity Laser Amplifier Integrated on the End Facet of an Optical Fiber . | NANOMATERIALS , 2024 , 14 (15) . |
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Abstract ：
Perovskite semiconductors have achieved great success during the last decades in the application of solar cells, light-emitting diodes, and photodiodes. Developing strategies to pattern perovskites with high-resolution is crucial to broaden the application scenarios of perovskite displays and on-chip lighting. However, the widely used lithography procedure has the problem of high-cost and complexity. In this study, we demonstrate a method to pattern a luminescent perovskite-acrylic polymer composite that is prepared by direct injection at room temperature. This strategy uses standard photoresists and UV lithography at room temperature, and then the pattern in the photoresists can be easily transferred to the perovskite-acrylic polymer composite. Finally, we can obtain high-quality micron-scale features. Furthermore, we demonstrate the universality of this strategy by adapting perovskite with different color emissions into the composite and patterning it using the same procedure. Another advantage of this patternable perovskite-acrylic polymer composite is its superb water-repellent properties, which are believed to be of great potential in underwater applications. (c) 2024 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license.
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| GB/T 7714 | Guo, Jinxin , Wang, Jing , Chen, Shuang et al. Patterning luminescent and stable perovskite-acrylic polymer composites via a convenient strategy [J]. | APL MATERIALS , 2024 , 12 (7) . |
| MLA | Guo, Jinxin et al. "Patterning luminescent and stable perovskite-acrylic polymer composites via a convenient strategy" . | APL MATERIALS 12 . 7 (2024) . |
| APA | Guo, Jinxin , Wang, Jing , Chen, Shuang , Tong, Peige , Liu, Yifei , Zhang, Yiwei et al. Patterning luminescent and stable perovskite-acrylic polymer composites via a convenient strategy . | APL MATERIALS , 2024 , 12 (7) . |
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Abstract ：
The Brust-Schiffrin two-phase method is a facile way to prepare thiolate-protected metal nanoparticles, but its mechanism remains controversial. In this work, we demonstrate the use of the Brust-Schiffrin method based on coordination compound theory. We confirmed that the formation of stable complexes is the driving force for a series chemical reaction in the organic phase. We found that the stable Cu(I)-thiolate complex decreased the half-cell reduction potential of Cu(I)/Cu(0). Thus, when thiol ligands were in excess, thiolate-protected Cu(I) clusters formed rather than Cu(0)-cored nanoparticles. The thiolate-protected metal-hydride nanoclusters were the intermediate between the metal complexes and nanoparticles. The "metallophilic" interactions of the d(10) closed-shell electronic configuration of the metal coordination centers were proposed as the driving force for nanocluster and nanoparticle formation. To confirm this mechanism, we synthesized Au, Ag, and Cu monometallic nanoparticles and bi- and trimetallic nanoparticles. We found that although thiolate-protected Cu(I) nanoclusters are not easily reduced, they can combine with Au and/or Ag nanoclusters to form nanoparticles. The proposed mechanism is expected to provide deeper insight into the Brust-Schiffrin method and further extend its application to metals other than Au, Ag and Cu.
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| GB/T 7714 | Liu, Hongmei , Li, Yuting , Li, Tian et al. Mono-, di- and trimetallic coinage nanoparticles prepared via the Brust-Schiffrin method [J]. | PHYSICAL CHEMISTRY CHEMICAL PHYSICS , 2024 , 26 (25) : 17760-17768 . |
| MLA | Liu, Hongmei et al. "Mono-, di- and trimetallic coinage nanoparticles prepared via the Brust-Schiffrin method" . | PHYSICAL CHEMISTRY CHEMICAL PHYSICS 26 . 25 (2024) : 17760-17768 . |
| APA | Liu, Hongmei , Li, Yuting , Li, Tian , Mu, Yunyun , Fang, Xiaohui , Zhang, Xinping . Mono-, di- and trimetallic coinage nanoparticles prepared via the Brust-Schiffrin method . | PHYSICAL CHEMISTRY CHEMICAL PHYSICS , 2024 , 26 (25) , 17760-17768 . |
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Abstract ：
Achieving a high-density, repeatable, and uniform distribution of "hotspots" across the entire surface-enhanced Raman scattering (SERS) substrate is a current challenge in facilitating the efficient preparation of large-area SERS substrates. In this study, we aim to produce homogeneous surface-enhanced Raman scattering (SERS) substrates based on the strong interaction between femtosecond laser pulses and a thin film of colloidal gold nanoparticles (AuNPs). The SERS substrate we obtained consists of irregularly shaped and sharp-edged gold nanoparticle aggregates with specially extruding features; meanwhile, a large number of three-dimensional AuNP stacks are produced. The advantages of such configurations lie in the production of a high density of hotspots, which can significantly improve the SERS performance. When the laser fluence is 5.6 mJ/cm(2), the substrate exhibits the best SERS enhancement effect, and a strong SERS signal can still be observed when testing the concentration of R6G at 10(-8) mol/L. The enhancement factor of such SERS substrates prepared using femtosecond laser direct writing is increased by 3 orders of magnitude compared to the conventional furnace annealing process. Furthermore, the relative standard deviation for the intensities of the SERS signals was measured to be 5.1% over an area of 50 x 50 mu m(2), indicating a highly homogeneous SERS performance and excellent potential for practical applications.
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| GB/T 7714 | Huang, Cuiying , Li, Hang , Zhang, Xinping . Direct Writing of SERS Substrates Using Femtosecond Laser Pulses [J]. | ACS OMEGA , 2024 , 9 (35) : 37188-37196 . |
| MLA | Huang, Cuiying et al. "Direct Writing of SERS Substrates Using Femtosecond Laser Pulses" . | ACS OMEGA 9 . 35 (2024) : 37188-37196 . |
| APA | Huang, Cuiying , Li, Hang , Zhang, Xinping . Direct Writing of SERS Substrates Using Femtosecond Laser Pulses . | ACS OMEGA , 2024 , 9 (35) , 37188-37196 . |
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Abstract ：
Highly efficient inorganic phosphors are desirable for lighting-emitting diode light sources, and increasing the doping concentration of activators is a common approach for enhancing the photoluminescence quantum yield (PLQY). However, the constraint of concentration quenching poses a great challenge for improving the PLQY. Herein, we propose a fundamental design principle by separating activators and prolonging their distance in Eu2+-activated Rb3Y(PO4)(2) phosphors to inhibit concentration quenching, in which different quenching rates are controlled by the Eu distribution at various crystallographic sites. The blue-violet-emitting Rb3Y(PO4)(2):xEu (x = 0.1%-15%) phosphors, with the occupation of Rb1, Rb2 and Y sites by Eu2+, exhibit rapid luminescence quenching with optimum external PLQY of 10% due to multi-channel energy migration. Interestingly, as the Eu concentration increases above 20%, Eu2+ prefer to occupy the Rb1 and Y sites with separated polyhedra and large interionic distances, resulting in green emission with suppressed concentration quenching, achieving an improved external PLQY of 41%. Our study provides a unique design perspective for elevating the efficiency of Eu2+-activated phosphors toward high-performance inorganic luminescent materials for full-spectrum lighting.
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| GB/T 7714 | Zhao, Ming , Ge, Yeping , Li, Yurong et al. Suppressed concentration quenching and tunable photoluminescence in Eu2+-activated Rb3Y(PO4)2 phosphors for full-spectrum lighting [J]. | LIGHT-SCIENCE & APPLICATIONS , 2024 , 13 (1) . |
| MLA | Zhao, Ming et al. "Suppressed concentration quenching and tunable photoluminescence in Eu2+-activated Rb3Y(PO4)2 phosphors for full-spectrum lighting" . | LIGHT-SCIENCE & APPLICATIONS 13 . 1 (2024) . |
| APA | Zhao, Ming , Ge, Yeping , Li, Yurong , Song, Xiaoyan , Xia, Zhiguo , Zhang, Xinping . Suppressed concentration quenching and tunable photoluminescence in Eu2+-activated Rb3Y(PO4)2 phosphors for full-spectrum lighting . | LIGHT-SCIENCE & APPLICATIONS , 2024 , 13 (1) . |
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