SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Tingting Luo,Yiqi Li,Yanxue Xu,Shiting Zhang,Yujue Wang,Xingming Kou,Dan Xiao
In this article, a hyperfluorescence 2-pyridone derivative (D-TPCA) has been synthesized within 5 min by the microwave-assistant heat treatment of the aqueous mixture of citric acid and 2-aminoethanethiol hydrochloride. The as-prepared D-TPCA exhibited good aqueous solubility and excellent fluorescent property with a quantum yield of 89.9%. Because the fluorescence of D-TPCA could be effectively quenched by picric acid (PA), D-TPCA could be served as a “turn-off” fluorescence sensor for PA in aqueous solution. The proposed sensing method permitted a selective and sensitive detection of PA in a linear range of 0–45 μM with a detection limit of 56.0 nM. The determination results of PA in real water samples with a recovery range of 95.4–107.3% confirmed a good analytical performance of this sensor. In addition, the possible sensing mechanism has been discussed in detail.
研究领域:
分析化学
·
材料科学
✓ 已验证
DOI
高影响因子
Nanoscale Advances
·
2024
·Vol. 6
·期 12
·3220-3228
·
IF 4.6
Xinjie Li,Linqi Chen,Danqun Mao,Jingzhou Li,Wei Xie,Hongxing Dong,Long Zhang
Due to the unique and excellent optical performance and promising prospect for various photonics applications, cavity-enhanced superfluorescence (CESF) in perovskite quantum dot assembled superstructures has garnered wide attention. However, the stringent requirements and high threshold for achieving CESF limit its further development and application. The high threshold of CESF in quantum dot superstructures is mainly attributed to the low radiation recombination rate of the quantum dot and the unsatisfactory light field limiting the ability of the assembled superstructures originating from low controllability of self-assembly. Herein, we propose a strategy to reduce the threshold of CESF in quantum dot superstructure microcavities from two aspects: facet engineering optimization of quantum dot blocks and controllability improvement of the assembly method. We introduce dodecahedral quantum dots with lower nonradiative recombination, substituting frequently used cubic quantum dots as assembly blocks. Besides, we adopt the micro-emulsion droplet assembly method to obtain spherical perovskite quantum dot superparticles with high packing factors and orderly internal arrangements, which are more controllable and efficient than the conventional solvent-drying methods. Based on the dodecahedral quantum dot superparticles, we realized low-threshold CESF (Pth = 15.6 μJ cm−2). Our work provides a practical and scalable avenue for realizing low threshold CESF in quantum dot assembled superstructure systems.
研究领域:
光学
·
材料科学
·
纳米技术
✓ 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
Nature Communications
·
2024
·Vol. 15
·期 1
·1-8
·
IF 14.7
Zhou Mengwei,Huang Ping,Shang Xiaoying,Zhang Ruihuan,Zhang Wen,Shao Zhiqing,Zhang Shuo,Zheng Wei,Chen Xueyuan
Photon upconversion through lanthanide-doped nanoparticles is of great significance for various applications. However, the current development of upconversion nanoparticles is hindered by the low quantum efficiency and long radiative lifetimes of lanthanide ions, restricting their applications in time-dependent nanophotonics. Herein, we report ultrafast upconversion superfluorescence with a lifetime of sub-2.5 ns in lanthanide-doped nanoparticles at room temperature. Upon excitation with an 800-nm fs-pulsed laser, we achieve a large number ( N = 912) of correlated dipoles in Nd 3+ -concentrated nanoparticles, resulting in collective coherent emission with two orders of magnitude amplification in intensity and more than three orders of magnitude improvement in the radiative decay rate. Furthermore, we demonstrate that the control of excitation power and emitting sample length enables the lifetime manipulation of upconversion emission in a wide range from μs to sub-ns, accompanied by the typical superfluorescence signature of Burnham-Chiao ringing. These findings may benefit applications in many advanced technologies such as quantum counting and high-speed super-resolution bioimaging.
研究领域:
纳米技术
·
光子学
·
材料科学
·
光学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
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