ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 7
·2212095
·
IF 19.924
Zhangchuan Wen,Rong Lu,Fan Gu,Kai Zheng,Lijie Zhang,Huile Jin,Yihuang Chen,Shun Wang,Shuang Pan
Chiral perovskite materials have intrigued enormous interests because of their appealing chiroptical properties and tailorable non-centrosymmetric structures. However, it remains challenging to realize high-efficiency blue emissive circularly polarized luminescence (CPL) of intrinsic chiral perovskite nanomaterials at room temperature. Herein, a robust and versatile electrospinning strategy is reported for in situ construction of chiral 2D and quasi-2D perovskite nanosheets (PNSs) protected in polymer hybrid nanofibers. It is found that quasi-2D chiral PNS/polymer possesses inherent chirality and enhanced CPL properties at room temperature compared to 2D counterparts. Notably, CPL emission color of chiral quasi-2D PNS/polymer can be tuned from deep blue to sky blue, and a high luminescence dissymmetry values up to −8.0 × 10 −3 can be achieved. Different perovskites, polymers, and nanofibrous structures are expanded to explore the universality of polymer protected PNSs. Significantly, compared to spin-coated film, the stabilities of quasi-2D PNS/polymer film are greatly improved due to the effective protection of polymer. The obtained PNS/polymer hybrid nanofiber films can be conveniently implemented for circularly polarized light emitting diode devices. This study may open up a new avenue for the scalable fabrication of chiral perovskite nanomaterials of interest and their applications in the CPL related fields.
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Materials Today Physics
·
2022
·
IF 11.021
Siqi Sun,Pei Jia,Qizhang Huang,Min Lu,Po Lu,Feisong Qin,Guang Sun,Yanbo Gao,Xue Bai,Zhennan Wu,Yu Zhang
Despite rapid development of perovskite nanocrystal (PeNC) light-emitting diodes (LEDs), it remains challenging to achieve efficient and stable blue PeLEDs , especially for pure-blue PeLEDs required for displays. Mixed halide CsPb(Br/Cl) 3 NC is a common strategy to achieve pure-blue emission, but suffers from low photoluminescence quantum yield (PLQY) and spectra instability. Here, a facile approach for the synthesis of high-quality pure-blue emitting CsPb(Br/Cl) 3 NCs is reported by introducing an organic sulfonate, phenyl trifluoromethanesulfonate (PTFMS), which works as an efficient surface passivator. As a result, the optimized PeNCs achieve a high PLQY of 85% and enhanced conductivity. Furthermore, the LED based on the optimized PeNCs is developed with pure-blue emission at 469 nm, which yields an external quantum efficiency (EQE) of 1.20% and luminance of 355 cd m −2 . More impressively, the device shows excellent spectra and operation stability under voltage bias , resulting from the suppressed ion migration channels by efficient defect passivation .
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Nanomaterials
·
2022
·Vol. 12
·期 21
·3742
·
IF 5.719
Qiao Li,Xiaosong Zheng,Xiaoyu Shen,Shuai Ding,Hongjian Feng,Guohua Wu,Yaohong Zhang
Colloidal AgBiS2nanocrystals (NCs) have attracted increasing attention as a near–infrared absorbent materials with non–toxic elements and a high absorption coefficient. In recent years, colloidal AgBiS2NCs have typically been synthesized via the hot injection method using hexamethyldisilathiane (TMS) as the sulfur source. However, the cost of TMS is one of the biggest obstacles to large–scale synthesis of colloidal AgBiS2NCs. Herein, we synthesized colloidal AgBiS2NCs using oleylamine@sulfur (OLA–S) solution as the sulfur source instead of TMS and optimized the synthesis conditions of colloidal AgBiS2NCs. By controlling the reaction injection temperature and the dosage of OLA–S, colloidal AgBiS2NCs with adjustable size can be synthesized. Compared with TMS–based colloidal AgBiS2NCs, the colloidal AgBiS2NCs based on OLA–S has good crystallinity and fewer defects.Keywords:AgBiS2;colloidal nanocrystals;hot injection;sulfur source
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INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Dayu Huang,Qiuyun Ouyang,Jinjiang Wu,Youchao Kong,Bo Wang,Hongzhou Lian,Jun Lin
Broadband emission with a large Stokes shift is important to obtain an excellent color rendering index of the solid-state lighting device. Among low-dimensional material and perovskite-like phosphors with broadband self-trapped emission, Sn-based phosphors have attracted much attention due to their high photoluminescence quantum yield (PLQY). However, the disadvantage is that the synthesis of Sn-based phosphors needs to be performed in a glovebox. Upon photoexcitation, the broadband emission of self-trapped excitons results from exciton–phonon coupling induced by the transient distortion of the lattice. Low-dimensional material structures often promote self-trapped emission because of more vibrational degrees of freedom and easier polarization under photoexcitation. Here, zero-dimensional (0D) SnX2 (X = Br, I) single crystals are synthesized by the solvent evaporation method in the air. SnX2 emits blue light, broadband yellow light, and deep red light, among which SnBr2 has the best luminescence performance. The photoluminescence quantum yield (PLQY) of SnBr2 reaches 85% and the Stokes shift reaches 265 nm. The PL intensity of SnX2 is linearly related to excitation power, which preliminarily indicates that the origin of SnX2 luminescence is attributed to self-trapped emission (STE). The white light-emitting diodes (WLEDs) were fabricated using yellow-emitting SnBr2 and blue-emitting BaMgAl10O17:Eu2+, which has a low correlated color temperature (3160 K) and a relatively common color rendering index (79).
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yanzhao Wu,Xiaoyang Yue,Jiajie Fan,Xiaoming Hao,Quanjun Xiang
In recent years, the semimetal bismuth with surface plasmon resonance (SPR) effect has attracted great attention due to its application in enhancing photocatalytic activity. Herein, we developed a novel plasma-enhanced Bi/CsPbBr 3 composite photocatalyst by in situ growth method (BCPB-IS) using the fabricated CsPbBr 3 nanosheets (CPB) as the substrate for subsequent growth of Bi nanoparticles. Without the addition of any sacrificial agent, the CO yield of BCPB-IS reaches 76.4 µmol g −1 with an over 97% selectivity of CO under 4 h visible light irradiation. Such remarkable CO 2 reduction activity far exceeds that of pure CPB. The enhanced activity can be attributed to these factors: (1) The SPR effect from the loading of Bi NPs enhances the light response performance of BCPB; (2) The simultaneously generated hot electrons leads to rising ambient temperature, which promotes the electron transfer efficiency and photoreduction reaction efficiency; (3) The energy band bending effect at the interface of BCPB further improves the carrier separation and transfer performance. The enhanced separation and transfer performance of photogenerated carriers were investigated in detail by X-ray photoelectron spectroscopy (XPS), Infrared thermograms and Time-resolved photoluminescence spectra (TRPL).
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Advanced Photonics Research
·
2022
·Vol. 4
·期 1
·2200230
·
IF 0
Gaoyu Chen,Xia Zhu,Chenyu Xing,Yongkai Wang,Xiangxing Xu,Jianchun Bao,Jinghan Huang,Yurong Zhao,Xuan Wang,Xiuqing Zhou,Xiuli Du,Xun Wang
The quality and property control of nanomaterials are center themes to guarantee and promote their applications. Different synthesis methods and reaction parameters are control factors for their properties. However, the vast combination number of the factors with multilevels leads to the obstacle that trying all-through the data space is nearly impossible. Herein, the combination of microfluidic synthesis method with machine learning (ML) models to address this challenge in case of perovskite quantum dots (PQDs) with tunable photoluminescence (PL) is reported. The ML-assisted synthesis not only helps to elucidate the nucleation growth-ripening mechanisms, but also successfully guides to synthesize PQDs with precise wavelength and full width of half maximum (FWHM) of the PL by optimizable conditions to match the time-saving, energy-saving, and minimal environmental pressure goals.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Xinyi Mei,Kege He,Rongshan Zhuang,Mubing Yu,Yong Hua,Xiaoliang Zhang
Lead halide perovskite quantum dot (QD) shows great potential for application in light-emitting diodes (LEDs) due to its high photoluminescence quantum yield (PLQY), high exciton binding energy, tunable emission spectra and solution processibility. However, the dynamic binding of conventional organic acid/amine ligands to the QD surface significantly deteriorates its optoelectronic properties and stability, to a large extent affecting the electroluminescence performance of QD-based LEDs. Herein, the zwitterionic molecule, betaine (BET) that could firmly anchor on the QD surface, is introduced to stabilize the dynamic surface and simultaneously passivate the surface defects of QDs. Systematically experimental studies and theoretical calculations reveal that BET-treatment could remove the dynamically bonded OA/OAm ligands and substantially diminish the surface defects of QDs, leading to a boosted PLQY of up to 92 % with improved stability of BET-QDs. Consequently, the electroluminescence performance of green-emitting QD-LEDs was largely improved that the external quantum efficiency was increased to 10.8 %, along with a decreased turn-on voltage of 3.2 V. This work provides new insights into the design criterion of surface ligands for modulating the surface chemistry of perovskite QDs to realize high-performance LEDs or other optoelectronic devices.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Yang Liu,Yuelei Li,Xudong Hu,Changting Wei,Bo Xu,Jing Leng,Haibo Miao,Haibo Zeng,Xiaoming Li
Surface ligands play important roles in synthesis, surface passivation, colloidal stability, and modulation of optoelectronic properties for quantum dots (QDs). It is well known that conventional ligands exhibit weak binding on the surface of perovskite QDs (PQDs), resulting in uncontrolled growth and unsatisfied stability during purification and operation. This impedes the device performance progress and practical applications severely. Stronger ligands anchoring on PQDs tightly and passivating surface defects efficiently have been reported to solve the problems. Herein, we choose a representative strong ligand, dodecylbenzene sulfonic acid (DBSA), to investigate its influence on PQD growth, stability under high-temperature with various solvents and additives, and the possibility of core–shell structure construction. Interestingly, the DBSA capped PQDs exhibit abnormally ripening under above conditions. Besides, a new mechanism for ion migration suppression is proposed based on internal lattice relaxation and inter-particle migration pathway elimination. Although DBSA-PQDs can be purified several times and maintain a high quantum yield, the corresponding light-emitting diodes show poor external quantum efficiency, which might be assigned to the unbalanced colloidal stability and film conductivity. This work indicates that strong ligands provide wider space for PQD modulation and the balance between stability and device performance should also be considered.
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Advanced Materials Interfaces
·
2022
·Vol. 10
·期 1
·2201916
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IF 6.389
Huazheng Li,Wangwei Lu,Gaoling Zhao,Bin Song,Weixia Dong,Gaorong Han
Due to the ultrafast nucleation and growth rates of perovskite nanostructures during the synthesis, the products are difficult to control, such as its derivatives (e.g., Cs 4 PbBr 6 ) often appear. Here, the hot-injection method is ameliorated by using oleylamine (OAm) instead of octadecene as solvent. The results reveal that in OAm-rich system, the pure nanostructures with different Pb/Br ratios (CsBr, Cs 4 PbBr 6 , and CsPbBr 3 ) can be obtained at different reaction temperatures, and thus controlling the Pb-Br linkage and the interconnection of [PbBr 6 ] 4− octahedra, and resulting in the formation of different nanostructures. As the reaction temperature increases from 120 to 180 °C, the products change from lead-free CsBr nanocrystals to poor-lead Cs 4 PbBr 6 nanocrystals and finally to normal CsPbBr 3 nanocubes and nanowires. Moreover, the synthesized CsPbBr 3 nanowires exhibit an emission peak at 521 nm, full width at half maximum (FWHM) of 19 nm, with photoluminescence quantum yields (PLQY) of 64.9%, and high stability. Furthermore, the white light-emitting diode (WLED) devices are successfully fabricated based on the obtained CsPbBr 3 nanowires, showing high-intensity white light and high stability without any encapsulation. Remarkably, this work provides a new approach for elucidating the synthesis mechanism of perovskite nanomaterials and their applications.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Zeren He,Yan Yang,Jiaxin Liu,Junyu Li,Xingyu Lu,Jikuang Zou,Shuai Yang,Yousheng Zou
Nowadays, halide perovskites have drawn extensive attention as active layers in the field of photodetectors (PDs) attributed to their optoelectric properties. However, the numerous defects in the prepared films and the lack of response in the near-infrared (NIR) range due to the intrinsic band gap limitation severely restrict the performances and applications of perovskite photodetectors. With this in mind, we introduced diethyl ether as a counter-solvent to improve the quality of the peroxide films. After comparison with chlorobenzene (CB), toluene (ToL), and ethyl acetate (EA), the mechanism by which diethyl ether (DE) as an antisolvent improves the quality of the films was explored. MAPbI3 films and lead sulfide (PbS) quantum dots (QDs) were then combined to achieve a visible (VIS)–near-infrared response. The resultant PD, with the structure of ITO/NiOx/PbS QDs/MAPbI3/PC61BM/Ag, exhibits an ultrabroad response from 300 to 1100 nm and presents high detectivity reaching 5.6 × 1011 and 6.5 × 1010 Jones in the VIS and NIR regions, respectively. The fast response time in the microsecond range and the response bandwidth of 10 kHz (f–3 dB) are comparable or even superior to counterparts. In addition, this approach provides ideas for the development of high-performance broadband perovskite-based optoelectronic devices.
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RSC Advances
·
2023
·Vol. 13
·期 4
·2311-2317
·
IF 3.9
Penghui Hu,Ruiyan Huang,Ye Xu,Tengfei Li,Jun Yin,Yu Yang,Yuan Liang,Xiaohan Mao,Li Ding,Chang Shu
Alkaline phosphatase (ALP) is an important biomarker whose abnormal level in activity is associated with hepatobiliary, skeletal, and renal diseases as well as cancer. Herein, we synthesized ZnSe@ZnS quantum dots (ZnSe@ZnS QDs) and Mn-doped ZnS quantum dots (Mn:ZnS QDs) as fluorophores to establish the ratiometric fluorescent assay for ALP activity detection in biological samples. p-Nitrophenyl phosphate (PNPP) was used as a substrate for ALP, and the overlaps between absorption spectra of PNPP and excitation spectra of QDs resulted in sharp fluorescence quenching. Under the catalysis of ALP, PNPP was hydrolyzed into p-nitrophenol (PNP), which caused a red shift of absorption band of PNPP and fluorescence recovery of Mn:ZnS QDs (585 nm). However, the overlaps between absorption spectra of PNP and emission spectra of ZnSe@ZnS QDs led a further quenching of ZnSe@ZnS QDs (405 nm). Therefore, the ratiometric fluorescent signals (F585/F405) were associated with activity of ALP based on bidirectional responses of QDs to the concentration of PNPP. Under the optimum conditions, the method exhibited a good linear relationship from 4 to 96 U per L (R2 = 0.9969) with the detection limit of 0.57 U per L. Moreover, the method was successfully applied for detecting the ALP activity in a complex biological matrix (human serum and HepG2 cells) with impressive specificity. In particular, the complicated chemical modifications of QDs and pretreatments of biological samples were not required in the whole detection procedures. Therefore, it not only provided a sensitive, specific and simple approach to clinical ALP activity detection, but it also provided support for early diagnosis of diseases.
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Nanoscale
·
2023
·Vol. 15
·期 8
·3991-3999
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IF 6.7
Lei Chen,Yun Gao,Jianxian Ge,Yi Zhou,Zhe Yang,Cang Li,Baoxing Huang,Kuan Lu,Dandan Kou,Dandan Zhou,Can Chen,Sixia Wang,Shuwang Wu,Jianfeng Zeng,Gang Huang,Mingyuan Gao
Magnetic resonance imaging (MRI)/nuclear medicine imaging (NMI) dual-modality imaging based on radiolabeled nanoparticles has been increasingly exploited for accurate diagnosis of tumor and cardiovascular diseases by virtue of high spatial resolution and high sensitivity. However, significant challenges exist in pursuing truly clinical applications, including massive preparation and rapid radiolabeling of nanoparticles. Herein, we report a clinically translatable kit for the convenient construction of MRI/NMI nanoprobes relying on the flow-synthesis and anchoring group-mediated radiolabeling (LAGMERAL) of iron oxide nanoparticles. First, homogeneous iron oxide nanoparticles with excellent performance were successfully obtained on a large scale by flow synthesis, followed by the surface anchoring of diphosphonate-polyethylene glycol (DP-PEG) to simultaneously render the underlying nanoparticles biocompatible and competent in robust labeling of radioactive metal ions. Moreover, to enable convenient and safe usage in clinics, the DP-PEG modified nanoparticle solution was freeze-dried and sterilized to make a radiolabeling kit followed by careful evaluations of its in vitro and in vivo performance and applicability. The results showed that 99mTc labeled nanoprobes are effectively obtained with a labeling yield of over 95% in 30 minutes after simply injecting Na[99mTcO4] solution into the kit. In addition, the Fe3O4 nanoparticles sealed in the kit can well stand long-term storage even for 300 days without deteriorating the colloidal stability and radiolabeling yield. Upon intravenous injection of the as-prepared radiolabeled nanoprobes, high-resolution vascular images of mice were obtained by vascular SPECT imaging and magnetic resonance angiography, demonstrating the promising clinical translational value of our radiolabeling kit.
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