International Journal of Minerals Metallurgy and Materials
·
2024
·Vol. 31
·期 6
·1456-1461
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IF 5.6
Zhang Anran,Zhou Xinquan,Gu Ranran,Xia Zhiguo
Mn 2+ doping has been adopted as an efficient approach to regulating the luminescence properties of halide perovskite nanocrystals (NCs). However, it is still difficult to understand the interplay of Mn 2+ luminescence and the matrix self-trapped exciton (STE) emission therein. In this study, Mn 2+ -doped CsCdCl 3 NCs are prepared by hot injection, in which CsCdCl 3 is selected because of its unique crystal structure suitable for STE emission. The blue emission at 441 nm of undoped CsCdCl 3 NCs originates from the defect states in the NCs. Mn 2+ doping promotes lattice distortion of CsCdCl 3 and generates bright orange-red light emission at 656 nm. The energy transfer from the STEs of CsCdCl 3 to the excited levels of the Mn 2+ ion is confirmed to be a significant factor in achieving efficient luminescence in CsCdCl 3 :Mn 2+ NCs. This work highlights the crucial role of energy transfer from STEs to Mn 2+ dopants in Mn 2+ -doped halide NCs and lays the groundwork for modifying the luminescence of other metal halide perovskite NCs.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Qianqian Fan,Mi Liu,Jie Chen,Xingyao Li,Tongtong Ma,Ling Wang,Wenbo Zhang,Jianzhong Ma
Green and sustainable approach is crucial for current and future leather industry. Chrome tanning agents have always been considered as the key materials for turning raw hides into leather by crosslinking collagen fiber. However, the low utilization rate (60–70 %) and potential risks of Cr 3+ oxidation to Cr 6+ in chromium may make it a past celebrity. In this research, Cs 2 ZrCl 6 nanocrystals (NCs) were applied in tanning process. Zirconium ions integrating with organic ligands in Cs 2 ZrCl 6 NCs allow for a born self-masking structure to give the uniform distribution of Zr 4+ form the fresh side to grain side in crust leather with the shrinkage temperature ( Ts) of 72.8 °C. Cs 2 ZrCl 6 NCs tanning not only improved the thermal properties, the physical-mechanical and organoleptic properties of tanned leather but also ideal environmental impact assessments. All the effort was devoted to promoting the development of collagen modification and opening up new perspectives on the research of halide perovskites.
研究领域:
生物化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2016
·Vol. 19
·期 8
·1165-1171
·
IF 3.849
Ting Zhang,Guopeng Li,Yajing Chang,Xiaoyan Wang,Bin Zhang,Haohan Mou,Yang Jiang
Herein, we demonstrate a facile and less costly approach to deliberately modulate the composition of CsPbX3 (X = Cl, Br, I) NCs. Taking advantage of the highly ionic nature of perovskite structures, complete anion-exchange could be realized on the basis of directly synthesized CsPbBr3 employing zinc halogenide salts as anion source, which embraces the advantages of remarkably short exchange time and room-temperature reaction environment while maintaining the cubic phase for all CsPbX3 NCs, as well as accessing superior perovskite NC qualities with high stability and narrow full width at half maximum peak widths of 18 nm to 38 nm. By controlling the relative concentration of halide anions in a CsPbX3 NC-dispersed solution, their photoluminescence spectra can be finely tuned with ease covering the entire visible spectral region of 410–700 nm.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Yijian Yin,Jun-Xuan Jin,Gao-Peng Ren,Ke-Jun Wu,Chao-Hong He
Cesium lead halide perovskite nanocrystals (CLHP NCs) have demonstrated their unique optical properties in next-generation lighting and display devices through controlling the size, shape, and composition. However, achieving their target-specific synthesis with numerous reaction parameters via traditional methods requires long and tedious optimization. Herein, a fully automated microfluidic meta learner (AMML) coupled with coiled flow inverter reactors (CFIR) is developed for facilely synthesizing desired CLHP NCs. CFIR offers a strong support in reagent mixing for AMML, producing high-quality NCs with negligible by-products. By concatenating the model-agnostic meta -learning and feedback control, AMML provides quick and accurate locating of target emission CsPb(Br x I 1-x ) 3 NCs in the wide range from 519 nm to 636 nm based on 3 data points, even in the no-prior-knowledge part. AMML exhibits excellent screening ability (25 experiments in 110 min) of reaction parameters for controllable synthesis of CsPbBr 3 NCs. Based on the optimal results, a white light-emitting diode is fabricated with excellent stability and a wide color gamut of 121 % NTSC. AMML offers a novel paradigm for the large-scale synthesis of desired NCs and can be applied to other NCs for intelligent and sustainable discovery.
研究领域:
材料科学
·
化学工程
·
人工智能
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Jiang Huang,Xue Jin,Xuefeng Yang,Tonghan Zhao,Helou Xie,Pengfei Duan
Distinguished from traditional physical unclonable functions (PUFs), optical PUFs derive their encoded information from the optical properties of materials, offering distinct advantages, including solution processability, material versatility, and tunable luminescence performance. However, existing research on optical PUFs has predominantly centered on visible photoluminescence, while advanced optical PUFs based on higher-level covert light remain unexplored. In this study, we present optical PUFs based on the utilization of the covert light of near-infrared circularly polarized luminescence (NIR-CPL). This interesting property is achieved by incorporating Yb-doped metal halide perovskite nanocrystals (Yb-PeNCs) possessing NIR emission property into chiral imprinted photonic (CIP) films. By employing a solvent immersion method, we successfully integrated Yb-PeNCs into these CIP films, thereby creating an optically unclonable surface. The resulting NIR-CPL emission adds a layer of advanced security to the optical PUF systems. These findings underscore the potential of solution-processable chiral films to play a pivotal role in advancing the next generation of PUFs.
研究领域:
材料科学
·
光学
·
信息安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2019
·
IF 10.159
Jia-Kai Chen,Ju-Ping Ma,Shao-Qiang Guo,Ya-Meng Chen,Qing Zhao,Bin-Bin Zhang,Zhi-Yong Li,Yang Zhou,Jingshan Hou,Yoshihiro Kuroiwa,Chikako Moriyoshi,Osman M. Bakr,Junying Zhang,Hong-Tao Sun
Cesium lead halide perovskite nanocrystals (NCs) have emerged as promising luminescent materials for a range of applications. However, the creation of highly luminescent violet-emitting CsPbCl3 NCs mostly relies on doping of a limited number of small-sized metal ions or post-synthetic surface treatment of NCs. Alkaline-earth (AE) metals (e.g., Ca2+, Sr2+, and Ba2+) have been proposed to be able to substitute Pb2+ in halide perovskites, yet it remains incompletely understood whether AE metal ions can be incorporated into the perovskite lattice or can be merely situated at the surface. Here, we explore the possibility of using AE metal ions for the suppression of the formation of trap centers, which leads us to develop a one-pot synthetic passivation strategy to boost the violet-emitting efficiency of CsPbCl3 NCs through the creation of a Ca2+/Sr2+ involved passivation layer. The photoluminescence quantum yield of violet emission reaches 77.1% by incorporating an optimal amount of Ca2+. A wide range of optical and structural characterizations, coupled with first-principles calculations, aid in clarifying the underlying mechanism for the AE-metal-dependent passivation of CsPbCl3 NCs. Specifically, based on the experimental and theoretical results, a model is proposed for the observed abnormal incorporation phenomenon of AE2+ ions in NCs (i.e., Ba2+ can be incorporated into the core of NCs, Ca2+/Sr2+ can only be at/near the surface, while Mg2+ can neither be in the core nor at the surface). We believe that the knowledge gained here may not only offer a new perspective to obtain high-efficiency violet-emitting perovskite NCs through a one-pot synthetic passivation but can also help elucidate the functions that AE2+ ions play in the optimization of perovskite optoelectronic devices.
研究领域:
材料科学
·
纳米技术
·
光电
·
物理化学
✓ 已验证
DOI
高影响因子
Nature Photonics
·
2022
·Vol. 16
·期 7
·485-490
·
IF 39.728
Chen Yifan,Yin Jun,Wei Qi,Wang Chenhao,Wang Xiaoting,Ren Hui,Yu Siu Fung,Bakr Osman M.,Mohammed Omar F.,Li Mingjie
Multiple exciton generation (MEG), the generation of multiple electron–hole pairs from a single high-energy photon, can enhance the photoconversion efficiency in several technologies including photovoltaics, photon detection and solar-fuel production 1 , 2 , 3 , 4 , 5 , 6 . However, low efficiency, high photon-energy threshold and fast Auger recombination impede its practical application 1 , 7 . Here we achieve enhanced MEG with an efficiency of up to 87% and photon-energy threshold of two times the bandgap in highly stable, weakly confined formamidinium tin–lead iodide perovskite nanocrystals (FAPb 1– x Sn x I 3 NCs; x ≤ 0.11). Importantly, an MEG-driven increment in the internal photocurrent quantum efficiency exceeding 100% with a low threshold is observed in such NC-sensitized photoconductors under ultraviolet-light illumination. The MEG enhancement mechanism is found to be mediated by the slower cooling and reduced trapping of hot carriers above the MEG threshold after the partial substitution of Pb by Sn. Our findings corroborate the potential importance of narrow-bandgap perovskite NCs for the development of optoelectronics that could benefit from MEG.
研究领域:
光伏技术
·
光子检测
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太阳能燃料生产
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纳米技术
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Energy Letters
·
2024
·
IF 19.3
Benzheng Lyu,Hong Lin,Dongyu Li,Aleksandr Sergeev,Qiang Wang,Zhengyan Jiang,Lijun Huo,Haibin Su,Kam Sing Wong,Yufeng Wang,Wallace C. H. Choy
Mixed-halide perovskite nanocrystals (PeNCs) featuring bandgap-tunable luminescence with narrow bandwidth have emerged as promising electroluminescent materials for light-emitting diodes (LEDs) to satisfy the color standard of Rec. 2100. However, the phase segregation of mixed-halide perovskites severely restricts the spectral stability and lifetime of perovskite LEDs (PeLEDs). Here, we report that the introduction of multifunctional side-chain-promoted polymer architectures in the synthesis of I/Br-mixed PeNCs to suppress halide segregation and enable electroluminescent stability of the PeLEDs up to ∼2500 min, which is the longest to our knowledge. Meanwhile, the PeLEDs exhibit the pure-red electroluminescence spectrum with Commission Internationale de l’Eclairage coordinates (0.705, 0.292) at one of the highest external quantum efficiencies reported to date, 23.6%. Fundamentally, the as-proposed polymer ligand architecture simultaneously offers long-term nanocrystal dispersion, good charge transport, defect elimination, and phase segregation suppression. Overall, the work demonstrates the potential of the multifunctionalized polymer ligands for developing high-performance PeLEDs toward practical applications.
研究领域:
材料科学
·
光电技术
·
纳米技术
·
化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Zhaoming Wang,Zixian Wei,Yuting Cai,Lei Wang,Mutong Li,Ping Liu,Rongjun Xie,Lai Wang,Guodan Wei,H. Y. Fu
Cesium lead halide perovskite nanocrystals have recently become emerging materials for color conversion in visible light communication (VLC) and solid-state lighting (SSL), due to their fast response and desirable optical properties. Herein, perovskite nanocrystal-polymethyl methacrylate (PNC-PMMA) films with red and yellow emission are prepared. The PNC-PMMA films, with optical properties such as a short lifetime and air stability, are used to make broadband color converters based on a high-bandwidth 75 μm blue micro-LED (μLED) for VLC. The yellow-emitting CsPb(Br/I)3 PNC-PMMA has a high bandwidth of 347 MHz, while the red-emitting CsPbI3 PNC-PMMA exhibits a higher modulation bandwidth of 822 MHz, which is ∼65 times larger than that of conventional phosphors. After fixing the two PNC-PMMA films in front of the μLED, a qualified warm white light is generated with a correlated color temperature of 5670 K, a color rendering index of 75.7, and a de L’Eclairage (CIE) coordinate at (0.33, 0.35). Although the color conversion of the blue light sacrifices some received power and slightly reduces the overall bandwidth from 1.130 to 1.005 GHz, a maximum real-time data rate of 1.7 Gbps is still achievable using the non-return-to-zero on–off keying modulation scheme, which is ∼6 times higher than that of the previous record. This study provides a practical approach to develop a considerably high-bandwidth white-light system for both high-speed VLC and high-quality SSL.
研究领域:
材料科学
·
光电
·
通信工程
·
光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）