查找使用阿拉丁产品的科研文献

A High-Sensitivity PtNPs@CsCu2I3 Single-Crystal UV Photodetector for Precision Sunscreen Protection Monitoring

Wenjie Li,Mengdan Chen,Hang Yin,Peng Wan,Caixia Kan,Daning Shi,Zhipeng Sun,Mingming Jiang

Addressing the public health challenge posed by skin cancer is the urgent necessity to devise bending and wearable ultraviolet (UV) photodetectors capable of monitoring the carcinogenic UV in everyday life on a real-time basis and with individualized coverage. This paper proposes a new plasmonic enhancement scheme using platinum nanoparticles (PtNPs)-decorated on the one-dimensional (1D) CsCu$_2$I$_3$ single-crystals (SCs) to high-performance and highly stable UV photodetection. Surface-coated PtNPs provide a plasmonic response with a maximum at 341 nm, which is essentially in coincidence with the absorption edge of CsCu$_2$I$_3$. This alignment contributes to a considerable increase in the light harvesting and carrier generation/separation efficiency. The optimized PtNPs@CsCu$_2$I$_3$ photodetector is characterized by outstanding performance under 340 nm illumination at 5 V bias, achieving a responsivity of 26.32 A/W, a specific detectivity of \(5.97 \times 10^{13}\) Jones, and ultrafast sub-millisecond response times (510 \(\mu\)s rise / 619 \(\mu\)s decay). Moreover, the detector is very environmentally stable, and the performance of the detector remains more than 95\% of the original 90 days ambient air storage in the absence of encapsulation. In a practical demonstration for sunscreen UV-blocking assessment, the device shows high linearity (\(R^2 = 0.99\)) and reliable accuracy in the different sunscreens with varying strength factors. This contribution does more than merely offer an efficient pathway of achieving high-performance copper-based perovskite photodetectors, although their possible applications in the real-world may be wearable health-commerce tags, environmental sensors, and optical communication structures.

High-Purity Blue Emission and Anti-Counterfeiting Mechanism of Ga-Doped CsCu2I3-Derived Cs3Cu2I5 Composite

Jing Su,Yubin Kang,Yichen Zhu,Zhi Wen,Mingchun Li,Qiangqiang Zhu,Yue Zhai,Tengfei Wu,Le Wang

Owing to their environmental friendliness and excellent luminescent properties, lead-free copper-based halide perovskites have attracted significant attention for use in next-generation optoelectronic devices. In this work, Ga-doped Cs3Cu2I5 phosphors derived from CsCu2I3 were synthesized using a high-temperature solid-state method. Ga doping effectively modulated the crystal growth behavior and electronic structure, enabling high-performance emission tuning. The optimized material exhibited high-color-purity blue emission centered at ∼446 nm, with a CIE color purity as high as 97.7%. Owing to its exceptional optical properties, a blue LED device was fabricated, exhibiting stable and high-color-purity emission, thereby highlighting its practical potential for high-resolution display technologies and solid-state lighting applications. Furthermore, the material demonstrates remarkable water-induced color-switching behavior, enabling reversible color changes upon exposure to water. This characteristic renders it a promising candidate for applications in anticounterfeiting and information encryption. This study provides new insights and strategic directions for the development of copper-based perovskites aimed at achieving high-color-purity blue emission and multifunctional intelligent material applications.

Mode-locking pulse generation based on lead-free halide perovskite CsCu2I3 micro-rods with high stability

Haiqin Deng,Xing Xu,Fangqi Liu,Qiang Yu,Bowang Shu,Zixin Yang,Sicong Zhu,Qinglin Zhang,Jian Wu,Pu Zhou

The industrialization and commercialization of optoelectronic devices require the exploration of novel materials with high stability, nontoxicity, and large-scale manufacturing. The all-inorganic lead-free halide perovskite nanomaterial CsCu2I3 has been widely reported in applications in light-emitting diodes (LEDs), photodetectors (PDs), photovoltaics, and so on, due to its good environmental stability and unique optoelectronic properties. However, research on ultrafast photonics has rarely been carried out so far. Here, high quality CsCu2I3 micro-rods were fabricated via a solvent evaporation crystallization method. The high thermodynamic stability and the broadband response of CsCu2I3-based optoelectronic devices have been predicted by density functional theory (DFT), revealing their feasibility for exploitation in fiber laser systems. The nonlinear characteristic of CsCu2I3 micro-rods was measured using a balanced twin-detector system, with a modulation depth of 12.04%. Utilizing its remarkable nonlinear optical response and intrinsic stability, a passively mode-locked erbium-doped fiber laser based on a CsCu2I3 saturable absorber was achieved. Significantly, the fiber laser could operate stably for at least five months. These experimental results demonstrate that CsCu2I3 micro-rods are ultra-stable, and can serve as a promising optical modulation material to produce an ultrafast and long-stability pulse in fiber laser applications.

mPEG-NH2-directed phase engineering of biphasic Cs3Cu2I5/CsCu2I3 copper halides for single-matrix white-light emission

Jingran Zhang,LiYan Zheng,Guifu Zuo,Yuchen Yue,Qian Zhang,Mengnan Zhang

Lead-free copper halides have emerged as promising self-trapped exciton (STE) emitters for broadband white-light generation, yet the direct construction of compositionally regulated single-matrix white emitters remains challenging. This study presents an mPEG-NH 2 -directed phase-engineering strategy for the one-step in situ construction of biphasic Cs 3 Cu 2 I 5 /CsCu 2 I 3 copper halides. By introducing methoxy polyethylene glycol amine into the ligand-assisted reprecipitation (LARP) process, the local coordination environment and supersaturation-driven nucleation behavior of Cs + , Cu + , and I − species are regulated, enabling the coexistence of blue-emitting Cs 3 Cu 2 I 5 and yellow-emitting CsCu 2 I 3 within one crystallization system. The amino and ether oxygen sites of mPEG-NH 2 further promote interfacial coupling with the copper halide matrix, reducing non-radiative STE deactivation and improving radiative recombination. The optimized CCI:3P sample exhibits broadband white-light emission with Commission Internationale de l’Éclairage (CIE) coordinates of (0.3236, 0.3347), a photoluminescence (PL) quantum yield of 42.8%, and a prolonged exciton lifetime. A UV-pumped WLED based on CCI:3P emits white light with a correlated color temperature of 6052 K. In addition, the biphasic material exhibits distinct water- and heat-induced luminescence changes, demonstrating stimulus-dependent optical contrast. This work provides a polymer-directed strategy for designing lead-free copper halide emitters with integrated white-light emission and responsive optical functionality.

Lead-Free CsCu2I3 Perovskite Nanostructured Networks Gas Sensor for Selective Detection of Trace Nitrogen Dioxide at Room Temperature

Xia Sun,Jie Yang,Zhilin Wu,Gang Meng,Xuezheng Guo,Delin Kuang,Lian Xiong,Weijie Qu,Xiaodong Fang,Xi Yang,Xiaosheng Tang,Yong He

Highly-efficient all-inorganic lead-free 1D CsCu2I3 single crystal for white-light emitting diodes and UV photodetection

Xiaoming Mo,Tao Li,Fengchang Huang,Zhuxin Li,Yulu Zhou,Tao Lin,Yifang Ouyang,Xiaoma Tao,Caofeng Pan

Lead-based halide perovskites have received great research interest in producing exceptional optoelectronic devices owing to their superior photophysical properties. However, inclusion of toxic Pb in these perovskites brings great risk to public health and hinders their use. Here we report the use of copper(I) to fully substitute Pb to produce Pb-free one-dimensional (1D) CsCu 2 I 3 single crystals (SCs). High-quality, air stable, and yellow-emitting 1D CsCu 2 I 3 SC with length as long as 13 mm is synthesized via inverse temperature crystallization method. A record photoluminescence quantum yield (PLQY) first exceeding 50% (50.4%) is obtained with oleic acid as additive during growth. White light-emitting diodes produced by using the 1D CsCu 2 I 3 SC as yellow phosphors are strikingly capable of working continuously for more than 580 h with a half-lifetime of ~150 h in air. Photodetectors fabricated by the 1D CsCu 2 I 3 SC show distinct UV response with fast response time as low as 50.4 ms (at 340 nm). Our findings pave a way by using the copper(I)-based 1D CsCu 2 I 3 SCs for future high-efficiency solid-state lighting and fast UV photodetection applications.

Pressure-assisted cooling to grow ultra-stable Cs3Cu2l5 and CsCu2l3 single crystals for solid-state lighting and visible light communication

Baiqian Wang,Chen Chen,Xin Yang,Wensi Cai,Shuangyi Zhao,Ru Li,Wen Ma,Jiangzhao Chen,Zhigang Zang

Owing to the excellent optical properties, white light-emitting diodes (WLEDs) based on metal halide perovskites have attracted great attention as promising light source for solid-state lighting and wireless visible light communication (VLC). However, the instability and toxicity of classic hybrid lead halides hinder their practical applications. Here, a pressure-assisted cooling method is developed to grow lead-free Cs 3 Cu 2 I 5 and CsCu 2 I 3 single crystals, which exhibit more excellent stability, larger size and uniform orientations in comparison with pressure-free cooling method. Then, both single crystals are used as the emitters of WLEDs without encapsulation, exhibiting a high Color Rendering Index of 91, a decent Commission Internationale de l'Eclairage coordinate of (0.33, 0.33), a proper Correlated Color Temperature of 5436 K, as well as an excellent 1350-h operating stability at atmosphere. Furthermore, the prepared WLEDs are utilized in wireless VLC, which possesses a −3 dB bandwidth of 10.1 MHz.

Mechanochemical Synthesis of Phase-Pure CsCu2I3 and Cs3Cu2I5 Phosphors Regulated by Polar Solvents and Their Application in Tunable Chromaticity LEDs

Yichen Zhu,Yubin Kang,Jing Su,Zhi Wen,Mingchun Li,Qiangqiang Zhu,Yue Zhai,Juan Kang,Yanghui Li,Le Wang

Lead halide perovskites have garnered interest in light-emitting diode (LED) applications due to their strong emission and tunable properties. However, conventional synthesis methods involve energy-intensive thermal processes and hazardous organic solvents, raising environmental concerns. In this study, we report a simple and eco-friendly mechanochemical approach that produces phase-pure blue-emitting Cs3Cu2I5 (emission at 440 nm) and yellow-emitting CsCu2I3 (emission at 570 nm) phosphors through polarity modulation and control of grinding duration. Our comprehensive analysis of the phase transitions during mechanochemical synthesis reveals that pure Cs3Cu2I5 was synthesized from a 3:2 precursor molar ratio in ethanol for 30 min, while pure CsCu2I3 was obtained from a 1:2 precursor molar ratio in an aqueous solution for 7.5 min. Moreover, Raman spectroscopy, X-ray diffraction, and energy-dispersive X-ray spectroscopy analyses confirmed that phase-pure phosphors were achieved through these methods. Finally, we fabricated a series of color-adjustable LEDs by mixing Cs3Cu2I5 and CsCu2I3 phosphors in different proportions. This demonstrates the potential of our mechanochemical synthesis for the efficient, large-scale production of next-generation lighting materials with tunable emission.

Capillary Epitaxy of Wide-Bandgap Copper Halide Single-Crystalline Film for Narrowband UV Photodetector and Dual-Mode Communication

Weidong Song,Junxing Lv,Jun Wei,Jiabo Ge,Hainan Qin,Huimin Duan,Jiaquan Li,Xin He,Ziqing Li

Wide-bandgap copper halide semiconductors hold significant potential for next-generation ultraviolet optoelectronics due to their remarkable photophysical properties. However, defects in polycrystalline films, such as point/interfacial defects and grain boundaries, create pathways for moisture and ion diffusion, thereby compromising device performance and stability. Herein, the capillary epitaxy growth of CsCu 2 I 3 single-crystal films (SCFs) is demonstrated with a bandgap of 3.68 eV on GaN, by leveraging capillary forces to guide the transport of the molten precursor and using lattice-matching substrates to achieve crystallographic alignments. This strategy suppresses random nucleation and produces CsCu 2 I 3 SCFs with high crystallinity (rocking curve FWHM = 0.286°). The critical role of lattice matching is further underscored by contrasting the polycrystalline CsCu 2 I 3 or Cs 3 Cu 2 I 5 films grown on lattice-mismatched substrates, as well as by the impressive open-circuit voltage of 1.08 V achieved in the CsCu 2 I 3 SCF/GaN heterojunction. The CsCu 2 I 3 SCF/GaN ultraviolet photodetectors demonstrate nW-level detection limit (≈2.81 nW) and self-powered operation, combining the 24 nm narrowband bandwidth with dual-mode (voltage/current) signal outputs for interference-resistant detection and communication. The work not only establishes the first route for the epitaxial growth of copper halide SCFs but also paves the way for the hetero-integration of perovskites onto mature semiconductor platforms for ultraviolet optoelectronics.