Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 35
·12302-12307
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IF 7.059
Xuyuan Bao,Mingze Li,Jing Zhao,Zhiguo Xia
CsPbI3 perovskite nanocrystals (NCs) are generally unstable, with low photoluminescence quantum yield (PLQY) and show deep red emission not suitable for optoelectronic applications. Herein, we propose a facile postsynthetic anion exchange method to enhance PLQY and stability via the controlled addition of ZnBr2 solution, in which the emission peak is adjusted from 690 nm to 550 nm and the PLQY was enhanced from about 50% to near unity (98%). We further unveiled the ion exchange kinetics of the rapid transitions between two phases (CsPbI3 and CsPbBrI2) within 40 minutes, and also demonstrated that the electron trap and hole trap transformed mutually with the increase of halogen enabling the variable PLQYs. Moreover, the as-prepared CsPbBrI2 NCs exhibit enhanced stability under UV irradiation and in water compared with that of pristine CsPbI3 NCs. The good stability and highly efficient narrow-band emission centered at 630 nm for CsPbBrI2 NCs show its potential application-possibility in liquid-crystal display backlight. It is suggested that the postsynthetic ZnBr2 halogen ion exchange method demonstrated here opens a new door for the synthesis of high-performance halide perovskite nanocrystals and the development of illumination and display applications.
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Photonics Research
·
2020
·Vol. 8
·期 8
·1301-1308
·
IF 6.099
Yifan Li,Yating Zhang,Zhiliang Chen,Qingyan Li,Tengteng Li,Mengyao Li,Hongliang Zhao,Quan Sheng,Wei Shi,Jianquan Yao,Jianquan Yao
Self-powered and flexible ultrabroadband photodetectors (PDs) are desirable in a wide range of applications. The current PDs based on the photothermoelectric (PTE) effect have realized broadband photodetection. However, most of them express low photoresponse and lack of flexibility. In this work, high-performance, self-powered, and flexible PTE PDs based on laser-scribed reduced graphene oxide (LSG)/CsPbBr3 are developed. The comparison experiment with LSG PD and fundamental electric properties show that the LSG/CsPbBr3 device exhibits enhanced ultrabroadband photodetection performance covering ultraviolet to terahertz range with high photoresponsivity of 100 mA/W for 405 nm and 10 mA/W for 118 μm at zero bias voltage, respectively. A response time of 18 ms and flexible experiment are also acquired at room temperature. Moreover, the PTE effect is fully discussed in the LSG/CsPbBr3 device. This work demonstrates that LSG/CsPbBr3 is a promising candidate for the construction of high-performance, flexible, and self-powered ultrabroadband PDs at room temperature.
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ACS Sensors
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2020
·
IF 7.333
Jianan Xu,Zhen Zhang,Shiyu Gan,Han Gao,Huijun Kong,Zhongqian Song,Xiaoming Ge,Yu Bao,Li Niu
Wearable potentiometric ion sensors are attracting attention for real-time ion monitoring in biological fluids. One of the key challenges lies in keeping the analytical performances under a stretchable state. Herein, we report a highly stretchable fiber-based ion-selective electrode (ISE) prepared by coating an ion-selective membrane (ISM) on a stretchable gold fiber electrode. The fiber ISE ensures high stretchability up to 200% strain with only 2.1% increase in resistance of the fiber electrode. Owing to a strong attachment between the ISM and gold fiber electrode substrate, the ISE discloses favorable stability and potential repeatability. The Nernst slope of the ion response fluctuates from 59.2 to 57.4 mV/dec between 0 and 200% strain. Minor fluctuation of the intercept (E0) (±4.97 mV) also results. The ISE can endure 1000 cycles at the maximum stretch. Sodium, chloride, and pH fiber sensors were fabricated and integrated into a hairband for real-time analysis of human sweat. The result displays a high accuracy compared with ex situ analysis. The integrated sensors were calibrated before and just after on-body measurements, and they offer reliable results for sweat analysis.
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高影响因子
LANGMUIR
·
2020
·
IF 3.557
Xian Wei,Shiliang Mei,Bobo Yang,Zhihao Chen,Hanqing Dai,Zhe Hu,Guilin Zhang,Fengxian Xie,Wanlu Zhang,Ruiqian Guo
Single-phased and dual-emissive nanocrystals with broad emission are attractive fluorescent materials for optoelectronic devices due to their unique properties. Until now, the effect of different metallic cations and inorganic anions on III–V group quantum dots (QDs) concerning luminescence features and crystalline growth has been less explored. In this work, dual-emissive InP/ZnS QDs single-doped with transition-metal compounds (Cu2+, Ag+, or Mn2+) are synthesized to compare their optical and morphological properties. The corresponding doping concentrations to realize dual emission with comparative intensity for Cu, Ag, and Mn are 0.8, 6, and 80%, which vary greatly and might be attributed to different precursor reactivities. As for the morphological and internal structures, transmission electron microscopy (TEM) images indicate that transition-metal ions have no obvious effect on the morphological properties and a higher concentration of chloride anions binding with an In-rich interface could conduce to a homogeneous distribution and triangular growth through the comparison of different metal chlorides as precursors. X-ray photoelectron spectroscopy (XPS) results further demonstrate that the high-resolution In 3d spectrum of Mn-doped InP/ZnS QDs with MnCl2 is mainly dominated by In–P bonds, indicating fewer intermediate chemical states. These results concerning well-defined InP/ZnS QDs could promote more diverse insight into surface chemistry and help to better understand the growth mechanism, thus making it possible to regulate InP/ZnS QDs into desired formats for different practical applications like white light-emitting diodes (LEDs).
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Journal of Physics Communications
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2020
·Vol. 4
·期 4
·045016
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IF 0
Jiahu Wei,Feng Li,Chun Chang,Qin Zhang
Indium-rich environmentally-friendly quantum dots (QDs) have received widespread attention due to the absence of cadmium. In this paper, AgInS2 (AIS) QDs are synthesized by hot injection method. By adjusting the ratio of indium/silver (In/Ag = 1, 2, 3, 4, 5), the AIS QDs exhibit a blue shift from 868 nm to 603 nm with the indium composition increases. Therein, the AIS QDs with the ratio of In/Ag = 4 show a highest photoluminescent (PL) quantum yields (QYs) up to 57%. AIS QDs are coated with ZnS shell to passivate the surface defects, and the PL QYs of obtained core/shell AIS/ZnS QDs is increased to 72%. By using these AIS/ZnS QDs as light emitters, light emitting diodes are assembled with a stacked multi-layer structure ITO/PEDOT:PSS/Poly-TPD/QDs/ZnO:Mg/Al. The resulted electroluminescent (EL) device exhibits a maximum external quantum efficiency (EQE) of 1.25% and an open circuit voltage of 4.6 V corresponding to a maximum brightness of 1120 cd m−2. Although the performances of the as fabricated AIS/ZnS-based device lag much behind than those of the Cd-based ones, they are expected to be enhanced with much more studies on the synthesis of the QDs and the optimization of device structure.
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Nanoscale
·
2020
·Vol. 12
·期 20
·11288-11296
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IF 6.895
Xuan Peng,Junchao Liu,Chen Ming,Bo Li,Zhen Zhao,Kaichuang Ye,Min Zeng,Rujia Zou,Xinwu Lu,Junqing Hu
Ternary I–III–VI2 semiconductors usually have narrow band gaps and large absorption coefficients arising from the unique characteristics of their outer-d valence electrons, which are intimately connected with the photothermal conversion properties. AgFeS2 is known as one such material that has the potential to absorb near-infrared light. In this work, we utilized density functional theory (DFT) calculations to evaluate the electronic structure and optical absorption properties of AgFeS2. Strong absorptions were predicted over a wide Vis-NIR region due to the localized 3d electron of Fe atoms, which agree quite well with the UV-Vis-NIR spectra measured by experiment. The as-prepared AgFeS2 nanoparticles were then modified with mPEG-DSPE, an efficient photothermal agent for artery stenosis therapy. Its photothermal conversion effect has been systematically studied, indicating the potential for causing the hyperthermia of macrophages, an essential part of the artery inflammation response. More importantly, both in vitro cell experiments and in vivo mouse-model studies show that the induction of hyperthermia in artery stenosis by using AgFeS2 nanoparticles is safe and effective when injected at a very low concentration. This study provides a novel photothermal platform derived from the inheritability of bandgap structure and also promotes the process of artery inflammation and stenosis therapy.
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Advanced Optical Materials
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2020
·Vol. 8
·期 12
·1902118
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IF 8.286
Fan Fang,Mengjia Liu,Wei Chen,Hongcheng Yang,Yizun Liu,Xiang Li,Junjie Hao,Bing Xu,Dan Wu,Kun Cao,Wei Lei,Peter Müller-Buschbaum,Xiao Wei Sun,Rong Chen,Kai Wang
Quantum dots (QDs) are promising for being used in advanced displays due to their outstanding emission properties. Herein, a novel encapsulation method for QDs is reported and ultra-stable QDs@SiO 2 @Al 2 O 3 luminescent microspheres (QLuMiS) are obtained by combining a sol–gel method for the intermediate SiO 2 layer with a fluidized powder atomic layer deposition (ALD) for the outer Al 2 O 3 layer. The rich hydroxyl coverage on the QDs@SiO 2 surface provides abundant chemisorption sites, which are beneficial for the deposition of Al 2 O 3 in the ALD process. Simultaneously, the water-oxygen channels in the SiO 2 layer are blocked by the Al 2 O 3 layer, which protects the QDs against deterioration. Consequently, the QLuMiS exhibit an excellent stability with 86% of the initial light conversion efficiency after 1000 h of blue light aging under a light power density of 2000 mW cm −2 . Such stability is significantly better than that of QDs@Al 2 O 3 and QDs@SiO 2 samples. Moreover, under this strong irradiation aging condition with blue light, the extrapolated lifetime (L50) of QLuMiS is 4969 h, which is ten times longer than that of QDs@SiO 2 and is the best record as far as is known. Finally, a prototype of a QLuMiS-based cellphone screen with a wide color gamut of 115% NTSC is demonstrated.
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INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Xin He,Chao Yu,Mengmeng Yu,Jing Lin,Qiaoling Li,Yi Fang,Zhenya Liu,Yanming Xue,Yang Huang,Chengchun Tang
All-inorganic CsPbX3 (X = Cl, Br, I) perovskite quantum dots (QDs) have great potential for various applications due to their excellent photoluminescence properties. However, poor stability under long-term storage hinders their applications. Herein we report the utilization of porous boron nitride nanofibers (BNNFs) as a promising carrier for anchoring of CsPbBr3 QDs. Due to the good dispersion and immobilization of CsPbBr3 QDs, the resulting CsPbBr3/BNNF composites show excellent photostability and superior long-term storage stability in an air environment. Moreover, the CsPbBr3/BNNF composites exhibit an interesting ammonia-responsive behavior: i.e., a distinct decrease in photoluminescence intensity upon exposure to ammonia gas and the subsequent photoluminescence recovery after post-treatment in nitrogen gas. Even after treatment with ammonia gas for 3 h, the composites can still be recovered under nitrogen gas treatment. The fast response, reversibility, and stability of CsPbBr3/BNNF composites in the presence of ammonia gas could inspire a broader range of applications.
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JOURNAL OF LUMINESCENCE
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2019
·
IF 2.961
Sihui Huang,Ting Zhang,Chunli Jiang,Chunhua Luo,Hechun Lin,Ye Chen,Ruijuan Qi,Wenlei Yu,Hui Peng
Organometal halide perovskite nanocrystals are very promising for optoelectronic applications due to their unique optical properties . However, the OHP nanocrystals generally suffer from problems such as nonuniform morphology and poor stability. This work reports the synthesis of MAPbBr 3 nanoplatelets through dilution of the irregular colloidal MAPbBr 3 nanocrystals prepared at 50 °C. The dilution followed by self-organization of the nanocrystals result in the production of uniform square nanoplatelets with long term stability up to 6 months and high photoluminescence quantum yield about 90%. Furthermore, by using bidentate coordination molecule pyrazole as co-ligand, regular 2D structural Nanocrystals with round edge and aggregation were produced. The aggregated nanoplatelets prepared at 50 °C show the same self-assembly process after dilution to form uniform square nanoplatelets.
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TRANSACTIONS OF TIANJIN UNIVERSITY
·
2019
·Vol. 26
·期 4
·273-282
·
IF 0
Liu Qing,Pu Yuan,Zhao Zhijian,Wang Jiexin,Wang Dan
We developed the high-gravity coupled liquid–liquid interface reaction technique on the basis of the rotating packed bed (RPB) reactor for the continuous and ultrafast synthesis of silver sulfide (Ag 2 S) quantum dots (QDs) with near-infrared (NIR) luminescence. The formation of Ag 2 S QDs occurs at the interface of microdroplets, and the average size of Ag 2 S QDs was 4.5 nm with a narrow size distribution. Ag 2 S QDs can disperse well in various organic solvents and exhibit NIR luminescence with a peak wavelength at 1270 nm under 980-nm laser excitation. The mechanism of the process intensification was revealed by both the computational fluid dynamics simulation and fluorescence imaging, and the mechanism is attributed to the small and uniform droplet formation in the RPB reactor. This study provides a novel approach for the continuous and ultrafast synthesis of NIR Ag 2 S QDs for potential scale-up.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Chunyu Sun,Xinzhan Wang,Yanmei Xu,Wanbing Lu,Xiaoyun Teng,Guangsheng Fu,Wei Yu
CsPbI 3 nanocrystals (NCs) with photoluminescence quantum yield (PLQY) larger than 90% have been synthesized at different temperature regions, and the physical origins for high PLQY were investigated. HRTEM images show that cubic phase CsPbI 3 (α-CsPbI 3 ) is surrounded by hexagonal Cs 4 PbI 6 in the low temperature region, and the ratio of CsPbI 3 and Cs 4 PbI 6 increases with increasing the reaction temperature. The strong confinement effect of Cs 4 PbI 6 leads to the high PLQY (95%) of α-CsPbI 3 NCs when the reaction temperature is 120 °C. The confinement effect of Cs 4 PbI 6 is weakened with increasing reaction temperature, which leads to the decrease of PLQY at 140 °C. However, non-radiative recombination is suppressed due to the microstructure improvement with further increasing the reaction temperature, and PLQY as high as 97% is achieved at 180 °C. Stability testing shows that fast degradation of α-CsPbI 3 NCs occur in low reaction temperature region, and α-CsPbI 3 NCs with high PLQY can be stored in air for 90 days when the reaction temperature is 180 °C.
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Journal of Materials Chemistry B
·
2019
·Vol. 8
·期 6
·1202-1211
·
IF 5.047
Kecan Lin,Yanbing Cao,Dongye Zheng,Qin Li,Hui Liu,Peiwen Yu,Jiong Li,Yanan Xue,Ming Wu
The development of nanotheranostic agents integrating diagnosis and therapy has gained tremendous attention in the past few decades, but many of them are inherently hydrophobic and need complicated phase-transfer and tedious surface modifications. This work proposed a facile method of transferring hydrophobic Fe3O4@Cu2−xS nanoparticles from oil to water by using red blood cell membrane to create theranostic nanobeads for T2-weighted MRI and second near-infrared photothermal ablation. The obtained nanoplatform, namely SCS@RBCM, showed a core–shell structure with the inner core densely packed with Fe3O4@Cu2−xS nanoclusters and the surface coated with a layer of RBCM. SCS@RBCM displayed a stable nanostructure, high NIR II light absorption and photothermal conversion ability, T2-weighted MR imaging and magnetic field targeting ability. Meanwhile, the RBCM cloaking endowed SCS with reduced elimination by macrophages. With the navigation of an external magnetic field (MF), the tumor accumulation of SCS@RBCM was dramatically increased, thus achieving good performance of MR imaging and antitumor efficacy through the PTT effect under NIR II irradiation. Therefore, our strategy presents a new and desirable paradigm in the phase-transfer of hydrophobic nanotheranostics for optimizing their biomedical performance.
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