JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.8
Shuya Ning,Chi Zhang,Naming Zhang,Jin Huang,Kunping Guo,Tao Lei,Fanghui Zhang
Development of efficient fluorescence resonance energy transfer (FRET) is essential for application in optoelectronic and sensing technologies. In this work, we synthesized silica-coated silver nanoparticles (Ag@SiO 2 core-shell NPs) with different shell thicknesses and investigated their effect on a FRET system composed of CsPbBr 3 nanocrystals (NCs) and red dye 4-(Dicyanomethylene)-2-tert-butyl-6-[1,1,7,7-tetramethyljulolidin-4-yl-vinyl]-4H-pyran (DCJTB). Compared to the nanoparticle-free system, doping the CsPbBr 3 : DCJTB system with Ag@SiO 2 core-shell NPs of optimal shell thickness enhanced the fluorescence emission intensity to 3.5 times that of the nanoparticle-free FRET system and improved the FRET efficiency from 28% to 75%. Moreover, the Ag@SiO 2 NPs with the optimal shell thickness can more effectively enhance FRET efficiency than the bare Ag NPs. It is attributed to the fact that the Ag@SiO 2 core-shell NPs can simultaneously avoid quenching effect and effectively enhance the FRET efficiency through the plasmonic properties. This study provides an effective approach for designing highly efficient FRET system and offers a pathway for further enhancing the performance of optoelectronic devices.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 20
·9771-9778
·
IF 3.3
Qin Zhang,Fang Guo,Run-Chi Zhao,Zhi-Hong Mo
Metal halide perovskite nanocrystals (PNCs) exhibiting excellent optoelectronic properties have been commonly synthesized by the ligand-assisted reprecipitation (LARP) method. However, the application of the LARP method for the large-scale production of PNCs is greatly hindered by the heavy use of the toxic antisolvent toluene and alkylamine ligand. In this study, ethanol was used as the antisolvent to synthesize CsPbBr3 PNCs at room temperature, which was enabled by simply using cyclodextrin (α-CD) as the ligand. The proposed method could produce α-CD@CsPbBr3 PNCs with a size of 35.0 ± 0.6 nm, a photoluminescence quantum efficiency of 86.0 ± 0.1%, and a yield of 33.4 ± 0.6% (5 batches). In addition, the obtained α-CD@CsPbBr3 PNCs could persist for 6 months in ethanol with a loss of luminescence of less than 10%. The effective generation, high reproducibility, and long-term stability of the PNCs were contributed from the strong interaction between α-CD and CsPbBr3 and the poor solubility of α-CD in ethanol, which resulted in a firm enclosing of CsPbBr3 crystals within α-CD molecules. Additionally, the anion exchanges of the α-CD@PNCs were rapidly achieved in ethanol by using common salts of KI and NaCl. Using a non-toxic and low-cost antisolvent and ligand, this method is more eco-friendly and economical than ever.
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Journal of Materials Chemistry A
·
2022
·Vol. 11
·期 1
·241-250
·
IF 14.511
Fanqi Luo,Mingyang Liu,Mang Zheng,Qi Li,Hong Wang,Jing Zhou,Yong Jiang,Yaoguang Yu,Baojiang Jiang
Realizing CO2 reduction with H2O oxidation on g-C3N4-based photocatalysts is quite promising yet challenging. Herein, an efficient direct Z-scheme heterostructure of ultrathin CsPbBr3/g-C3N4 nanosheets is fabricated via a simple electrostatic self-assembly process, resulting in an effective photocatalytic reduction of CO2 to CH4 (184.0 μmol g−1) and CO (105.2 μmol g−1) with oxidation of H2O under AM 1.5G irradiation. Notably, in situ X-ray photoelectron spectroscopy (XPS) analysis demonstrated that a direct Z-scheme charge transfer mechanism at the CsPbBr3 and g-C3N4 interface is enabled, thereby achieving efficient charge separation and high redox potentials to drive photocatalytic CO2 reduction and H2O oxidation synchronously. Isotopic labelling experiments revealed that the adsorbed water is activated to release H atoms and eventually assists the CO2 reduction. Theoretical calculations further revealed that the p orbitals of Pb atoms hybridize with the 2π* orbitals of CO2 molecules, strengthening the affinity of CO2 and weakening the binding strength. Moreover, overlapping between Pb p orbitals and 5σ orbitals of CO molecules promote the protonation of CO* intermediates. This work provides an in-depth understanding and guidance for constructing high-efficiency catalysts for CO2 reduction with H2O oxidation.
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高影响因子
ORGANIC ELECTRONICS
·
2023
·
IF 3.2
Shengfeng Tang,Yu Zhao,Jiachen Kang,Wenzhe Huang,Gufeng He
Surface vacancies are commonly formed during the synthesis and purification of perovskite nanocrystals (NCs), which usually lower the photoluminescence quantum yield (PLQY) and stability. In this study, we demonstrate a facile post-synthetic treatment with SnBr 2 to passivate the existing Pb 2+ and Br − vacancies on the surface of CsPbBr 3 NCs. The PLQY of passivated NCs in the solution increases from 73% to 94%, and the average fluorescence lifetime of CsPbBr 3 NC film is prolonged from 7.77 to 9.78 ns, indicating a higher degree of radiative recombination of electron-hole pairs. The CsPbBr 3 NCs treated by SnBr 2 present higher stability with 82% of the original PLQY after two weeks of storage in ambient atmosphere, while the PLQY of untreated NCs drastically drops to 58%. Furthermore, the maximum current efficiency of the light-emitting diode based on the modified CsPbBr 3 NCs is enhanced by a factor of 2.5. It is believed that the proposed post-synthetic treatment method is promising in enhancing the PLQY and stability of perovskite NCs, as well as promoting the efficiency of the electroluminescent device.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 32
·10965-10972
·
IF 6.4
Mingming Liu,Qun Wan,Xinrong Liao,Wenji Zhan,Changwei Yuan,Qinggang Zhang,Mengda He,Cong Zou,Meitian Pan,Long Kong,Liang Li
Perovskite nanocrystals, which are well-known for their outstanding optoelectronic properties, have attracted widespread attention for several photonic and optoelectronic technologies. However, the inherent instability of perovskite nanocrystals limits their practical applications. Therefore, herein, we developed a calcium- and fluorine-ion combined-treatment method to enhance the stability of perovskite nanocrystals, which not only exhibited near unity photoluminescence efficiency and cubic morphology, but also possessed excellent photostability and thermal resistance. Additionally, the light-emitting diodes incorporating these perovskite nanocrystals showed pure green electroluminescence with a maximum external quantum efficiency of 11.85%, luminance as high as 20 940 cd m−2, and stable operation for up to 172 min.
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高影响因子
SOLAR ENERGY
·
2022
·
IF 7.188
Wenhu Zhang,Pin Lv,Yujiao Li,Yangqing Wu,Jia Dong,Wenzhi Wang,Hairui Sun,Bingqiang Cao
Hole transport layer free perovskite solar cells (HTL-Free PSCs) have attracted extensive attention due to their advantages of simple structure and low cost. However, due to the serious energy level mismatch caused by the direct contact between the perovskite layer and the opposite electrode, the space for improving the efficiency of HTL-Free PSCs is greatly limited. We use Eu 3+ doped CsPbBr 3 quantum dots (QD) to modify the interface between MAPbI 3 :Na layer and C electrode, and study its effect on the surface defect passivation, interface energy level arrangement and carrier transport behavior in the device. It was found that compared with the interfacial modification of CsPbBr 3 QD alone, the interfacial modification of CsPbBr 3 :Eu QD could effectively solve the problem of energy level mismatch in HTL-Free PSCs, resulting in a remarkable improvement of conversion efficiency from 9.01 % to 12.95 %. Furthermore, electron beam induced current (EBIC) was used to prove that CsPbBr 3 :Eu QD interface modification significantly improved the hole collection ability. This provides an experimental basis and theoretical guidance for the optimization of the efficiency of other types of transport layer free photovoltaic devices.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Mengmeng Yu,Yaobin Xu,Jing Lin,Chao Yu,Yi Fang,Zhenya Liu,Zhonglu Guo,Chengchun Tang,Yang Huang
All-inorganic CsPbX 3 (X = Cl, Br, I) perovskite quantum dots (QDs) are vulnerable to adverse factors such as light, high temperature and moisture due to its inherent structural instability, thus limiting its application in the field of optoelectronics . Here, we propose a nano-encapsulation strategy to improve the stability of CsPbBr 3 (CPB) QDs via compression packing of the QDs within two-dimensional flexible BN nanosheets (BNNS). After pre-preparing of CPB/BNNS nanocomposite powder, a dense CPB/BNNS plate is obtained through the compression packing of the powder under the action of external force in a certain mold. By further grinding and sieving, powdery CPB/BNNS particles with the same encapsulation effect are obtained. As compared with CPB/BNNS nanocomposite powder, the plate and particle samples after compression packing can retain the excellent photoluminescence (PL) properties of CPB QDs, while showing greatly improved stabilites in various adverse environments. After compression packing, both of the CPB QDs anchored in BNNS folds and exposed to BNNS interlayers can be well encapsulated in the dense composite structure, which can realizing the successful nano-encapsulation of CPB QDs by BNNS. In addition, the white LED device constructed with CPB/BNNS particle as green phosphor exhibits excellent white light emission and stability.
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高影响因子
Nanoscale
·
2022
·Vol. 14
·期 46
·17222-17229
·
IF 8.307
Heng Lu,Xiaohong Tan,Guobin Huang,Shaoru Wu,Yanmei Zhou,Junying Zhang,Qiaowen Zheng,Tianju Chen,Feiming Li,Zhixiong Cai,Jingbin Zeng,Maosheng Zhang
Perovskite nanocrystals (PNCs) have attracted widespread attention as promising materials for the optoelectronic field due to their remarkable photophysical properties and structural tunability. However, their poor stability and the use of toxic organic solvents in the preparation process have severely restricted their practical applications. Herein, a facile, rapid and toxic organic solvent-free synthesis strategy of CsPbBr3 PNCs was developed for the first time via the ligand-assisted reprecipitation (LARP) method using natural deep eutectic solvents (NADESs) as solvents and surface ligands. In this method, the NADESs not only functioned as solvents for green synthesis, but also served simultaneously as surface ligands of CsPbBr3 PNCs to significantly improve their optical properties and stability. The as-synthesized CsPbBr3 PNCs exhibited high photoluminescence quantum yield (PLQY, ∼96.8%), narrow full width at half-maximum (FWHM, ∼18.8 nm) and a high stability that retained 82.9% of PL intensity after 70 days. This work provides a new strategy for the green synthesis of PNCs, which promises feasibility for the industrial large-scale synthesis of high-quality PNCs.
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PubMed
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 45
·17109-17118
·
IF 8.067
Jiamin Sun,Zhentong Lu,Yi Liu,Dongwei Zheng,Juqing Li,Lei Jin,Jiayu Zhang,Haoran Zhang,Yingliang Liu,Xuejie Zhang,Bingfu Lei
Laser-driven projection technology urgently requires green emitters with a narrow bandwidth, high quantum efficiency, and long-term stability to compensate for the “green gap”. Herein, a highly stable CsPbBr3–SiO2 glass ceramic film was synthesized by co-sintering high-photostability CsPbBr3–SiO2 powder and low-melting glass frit on sapphire, where the high thermal conductivity of sapphire and the SiO2 barriers could help maintain the stability of CsPbBr3 nanocrystals (NCs), endowing the well-known CsPbBr3 material with the possibility of application in the field of laser-driven projection displays. Furthermore, a “fluorescence wheel” was fabricated by pasting the CsPbBr3–SiO2 glass ceramic film on a micro motor, which could effectively alleviate the thermal quenching and increase the laser saturation threshold. Benefiting from its elaborate design, the operating temperature of the glass ceramic film was reduced from 351 °C to 75 °C and its luminescence intensity was maintained at 86% of its initial brightness at the laser power density of 4.5 W mm−2 for 60 min. As a proof-of-concept experiment, an all-inorganic multi-color fluorescent plate with red and green light emissions was obtained by combining the K2SiF6:Mn4+ phosphor and CsPbBr3–SiO2 powder in a patterned manner on sapphire, which provides an idea for the application of CsPbBr3 NCs and K2SiF6:Mn4+ phosphor in laser projection systems.
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高影响因子
Journal of Analysis and Testing
·
2022
·Vol. 7
·期 1
·1-7
·
IF 0
Li Heng‑Gan,Zhu Yi‑Men,Liu Xue‑Lian,Guo Zhi‑Yong,Huang Ya‑Ning,Chen Xi
In this study, the halogen exchange reactions are investigated between KI or methylamine iodide in aqueous solution and CsPbBr 3 NCs in toluene. The mass transfer process on the interface between water and toluene affects the halogen exchange time and efficiency. Stirring and heating can effectively improve the halogen exchange efficiency and increases the sensing sensitivity. The photoluminescence wavelength shift of CsPbBr 3 NCs shows good linear relationship with the concentration of I − in the range from 0 to 20 nmol/L with the detection limit of 0.2 nmol/L I − . Taking H 2 O 2 as a typical water-soluble oxide, the method is applied to the colorimetric sensing of H 2 O 2 in water solution. After the optimization of sensing conditions, the obvious wavelength shift could be observed with the different concentration range of H 2 O 2 . A good linear relationship between the wavelength shift and the H 2 O 2 concentration from 0 to 1.0 mmol/L with the detection limit of 0.05 mmol/L H 2 O 2 could be found.
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Energy Technology
·
2022
·Vol. 10
·期 6
·2200054
·
IF 4.149
Jianlin Chen,Wei Qiu,Caiyou Huang,Lin Wu,Chang Liu,Qiaoqiao Tian,Zhuoyin Peng,Jian Chen
All-inorganic CsPbBr 3 perovskite solar cells (PSCs), which show potential applications in the semitransparent top cell of tandem solar cells, have attracted tremendous attention owing to their outstanding thermal and moisture stability in an air atmosphere. However, the common solution-processed CsPbBr 3 perovskite films usually suffer from poor phase purity due to the local uncontrolled ratio of CsBr and PbBr 2 . Herein, a novel 2-methoxyethanol solvent for CsBr is used in place of methanol to yield high-quality CsPbBr 3 films with better phase purity as well as larger and more uniform grains. Meanwhile, a facile and controllable reflux condensation technique is proposed to prepare In 2 S 3 thin films for the electron transport layer (ETL) of CsPbBr 3 PSCs. Therefore, the power conversion efficiency (PCE) of all-inorganic planar CsPbBr 3 PSCs with the architecture of FTO/In 2 S 3 /CsPbBr 3 /carbon is increased from 5.83% to 6.42%. By adjusting the reflux condensation temperature (80, 100, 120, or 140 °C) and tailoring the aggregation of In 2 S 3 colloidal particles, In 2 S 3 thin films with different surface roughnesses are synthesized to optimize the ETL of the devices, which further enhances the short-current density and boosts the PCE to 6.54%.
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高影响因子
OPTICS EXPRESS
·
2022
·Vol. 30
·期 12
·20241-20249
·
IF 3.833
Hao Chen,Rui Wang,Wenqiang Ma,Huanhuan Zhang,Lin Yang
The large-scale and continuous production of CsPbBr3@PMMA composite film is realized by the in-situ ultrasonic spray coating method at room temperature. Through embedding CsPbBr3 nanocrystals into the hydrophobic polymer framework, the as-fabricated films (20 cm × 20 cm) exhibit uniform green emissions with a relatively high PLQYs of 76%, and could maintain 80% PL intensity after 3 months storage under ambient conditions. Assembling the green-emissive CsPbBr3@PMMA film and the red-emissive KSF@PMMA film with blue LED chip, a high-performance LCD is obtained, reaching a higher saturation with 126% and 94% color gamut of NTSC and Rec.2020, respectively. This work demonstrates that ultrasonic spray coating technique could be widely used in the large-scale fabrication of uniformly high-quality perovskite films for backlight application.
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高影响因子
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