ACS Applied Nano Materials
·
2023
·
IF 5.9
Jiawei Wang,Peng Lu,Yunlong Shuai,Zhanbo Fan,Yunzhe Li,Xinyuan Li,Ruijin Hong,Chunxian Tao,Qi Wang,Hui Lin,Zhaoxia Han,Dawei Zhang
A series of CH3NH3PbBr3 (MAPbBr3) nanostructure-based films with various thicknesses on indium-tin-oxide (ITO)-covered substrates were fabricated by the spin-coating technique. The effects of ITO on the structure, surface morphology, and optical properties of MAPbBr3 thin films were investigated, respectively. Compared with monolayer MAPbBr3 thin films, the ITO buffer layer has the effect of improving the crystalline quality and preferential orientation of MAPbBr3 thin films, realizing the transition from reverse saturation absorption to saturation absorption. The tunability of nonlinear optical absorption was achieved by changing the thickness of the MAPbBr3 film. The maximum three-photon absorption coefficient of the monolayer MAPbBr3 film was 7.35 × 10–14 cm3/W2. The maximum third-order nonlinearity coefficient of MAPbBr3/ITO composite film was −1.04 × 10–5 cm/W. In addition, the finite-difference time-domain simulation results were in good agreement with the experimental results. These results indicate that the synthesized MAPbBr3 nanostructure-based films have potential applications in nonlinear optical devices.
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高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2018
·Vol. 20
·期 30
·19950-19957
·
IF 3.906
Yonghao Liu,Quan Xu,Shuai Chang,Zhao Lv,Sheng Huang,Feng Jiang,Xin Zhang,Gaoling Yang,Xin Tong,Shujuan Hao,Yandong Ren
Organic–inorganic hybrid perovskite (CH3NH3PbX3, X = Cl, Br, or I) quantum dots have become one of the most promising materials for optoelectronic applications. We controllably synthesized CH3NH3PbBr3 quantum dots with a tunable spectrum with the emission peaks covering the range from green (523.6 nm), blue and eventually to deep violet (409.4 nm), which is wider than that of quantum dots obtained without changing the halide component. The mechanism of the blueshift was investigated. The purified quantum dots have allowed the fabrication of efficient electroluminescence devices having a simple glass/ITO/PEDOT:PSS/TFB/CH3NH3PbBr3 quantum dot/TPBi/LiF/Al structure. CH3NH3PbBr3 quantum dots with 5–30 μL n-octylamine showed an ideal color-saturated green emission with Commission Internationale de l’Eclairage color coordinates of (0.123, 0.744) and a narrow full width at half-maximum of 19–24 nm. The photoluminescence quantum yield was up to 90.2%. In addition, it is also worth noting that the chromaticity coordinates (x, y) of CH3NH3PbBr3 quantum dots with 50–100 μL n-octylamine are (0.300, 0.344), (0.305, 0.314) and (0.323, 0.318) in the white region. All these properties indicate that these MAPbBr3 quantum dots can provide effective data support for the application of white LEDs, and may potentially be used as single-component multicolor-emitting materials, which can be applied to lighting and display technology.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Yanchun Yang,Song Wei,Xiaojiao Kang,O. Tegus,Daocheng Pan
Employing the short-chain C 4 H 9 NH 3 X (X = Cl, Br, I) compound as the unique capping agent, highly quality CH 3 NH 3 PbX 3 (X = Cl, Br, I) perovskite quantum dots can be synthesized at room temperature in the open air, which possess high photoluminescence quantum yields and tunable emission in the range of 440–660 nm. Besides, C 4 H 9 NH 3 Br can also improve the morphology of CH 3 NH 3 PbBr 3 thin films by spin-coating the N, N -dimerthylformamide solution of CH 3 NH 3 Br, C 4 H 9 NH 3 Br and PbBr 2 , making the thin film dense and compact, and improving its optical properties .
研究领域:
材料科学
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纳米科技
·
光电功能材料
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半导体物理
·
凝聚态物理
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高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Jingwen Li,Qian Wang,Chengyi Xiong,Qianchun Deng,Xiuhua Zhang,Shengfu Wang,Miao-Miao Chen
Mycotoxins contamination, especially aflatoxin B1 (AFB1) in edible oils, is a health hazard. Therefore, AFB1 trace analysis methods are urgently needed. Electrochemiluminescence (ECL) is a popular sensing method because of its low background interference and high sensitivity. However, existing ECL assays for AFB1 detection are based on aqueous rather than oil systems. Herein, we report a CH 3 NH 3 PbBr 3 quantum dots (MAPB QDs)@SiO 2 -based ECL sensor for AFB1 quantification in corn oil using an organic electrolyte. The luminophore loading and stability of the MAPB QDs@SiO 2 particles were significantly improved compared to those of bulky MAPB materials, resulting in an enhanced ECL response. Further, exploiting molecular imprinting technology, an ECL sensor for AFB1 detection with an ultra-low detection limit of 8.5 fg/mL was prepared. The reliability of the sensor was confirmed by comparable recoveries of corn oil samples with those obtained by high-performance liquid chromatography, indicating its potential for food safety evaluation.
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DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Ling He,Yi Ding,Qizheng Dong,Weimin Sun,Yuhua Wang
CH 3 NH 3 PbBr 3 perovskite quantum dots (PeQDs) have demonstrated excellent performance and are promising for optoelectronic applications . However, poor stability caused by surface defects severely limits their further development. In this work, cheap, green Tartaric acid (Ta) was introduced as a multisite passivator for the synthesis of CH 3 NH 3 PbBr 3 PeQDs by ligand-assisted reprecipitation at room temperature , and the effect of Ta on the luminous properties and stability of CH 3 NH 3 PbBr 3 PeQDs was investigated. The hydroxyl group of Ta can anchor Br − of PbBr 6 4− octahedra , reducing the Br vacancy by reducing surface Br − loss, and the carboxyl group can form a coordination bond with Pb 2+ , all contributing to reducing surface defects , inhibit heavy metal leakage, reduce toxicity and improve luminous properties and stability. The results showed that the FWHM (full width at half maxima) of the Ta-modified PeQDs was 19 nm, PLQY reached 88.24 % and showed bright fluorescence for 100 days at room temperature. Ta-modified PeQDs-based white LED (WLED) emitted cold white light, with ultrahigh luminous efficiency of 121.57 lm/W, color gamut of 127 % of the National Television System Committee (NTSC) standard and high operate stability. Our work provides new ideas for low-cost preparation of perovskite devices with high optoelectronic performance.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Lin Zhu,Xiaoyue Su,Hao Ma,Lianze Shan,Bing Zhao
Spectra in surface-enhanced Raman scattering (SERS) are always accompanied by a continuous emission known as “background”, which complicates the analysis with a poor signal-to-noise ratio (SNR), especially for qualitative and quantitative detection. Here, the SERS profile of the CH 3 NH 3 PbBr 3 substrate displays high similarity with the bulk Raman spectra, and its FWHM is exceeding narrow. The significantly increased SNR of the probe molecules indicates that the substrate helps to improve the quantitative analysis capability of the SERS technology and alleviate the background-related problems. For the CH 3 NH 3 PbBr 3 substrate, good linearity (R 2 = 0.9591) in the range of 1.0 × 10 -7 − 1.0 × 10 -3 mol/L was obtained and the limit of detection (LOD) is 7.88 × 10 -6 mol/L. The reason for this excellent performance is that the introduction of organic molecules splits the 3D CH 3 NH 3 PbBr 3 substrate to form a 2D perovskite that fixes the molecular orientation through chemical interactions. The CH 3 NH 3 PbBr 3 has the advantage of maintaining the conformation and orientation consistency of adsorbed molecules. Meanwhile, compared with the commonly used noble metal (Au, Ag) and semiconductor (ZnO, TiO 2 ) SERS substrates, the CH 3 NH 3 PbBr 3 substrate has obvious superiorities in both spectral peak intensity and peak shape. Furthermore, the CH 3 NH 3 PbBr 3 substrate possesses specific recognition ability that has the same enhancement effect for a series of pyridine-containing probe molecules. Finally, the enhancement mechanism is discussed according to the CT contribution. As a promising substrate for SERS technology, CH 3 NH 3 PbBr 3 will provide more possibilities for quantitative and multiplex detection in the future.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2019
·
IF 2.291
Qianqian Zhang,Haishan Wu,Wei Lin,Jiannan Wang,Yuwu Chi
Perovskite quantum dots (PQDs) are getting more and more attention for their unique optical properties such as high photoluminescence quantum yield , narrow emission spectrum, and adjustable emission wavelength . However, PQDs, especially, CH 3 NH 3 PbX 3 PQDs have very poor stability due to their easy decomposition by water and oxygen in the air. Herein, we grew nano-sized CH 3 NH 3 PbBr 3 PQDs in situ within a kind of micro-sized metal-organic frameworks (Bio-MOF-1) to obtain MOFs-protected PQD composites (PQDs-Bio-MOF-1). The MOF protection only enables the PQD composites to maintain the fluorescence characteristics of PQDs, but also obviously improves the stability of PQDs in the air, showing promising application in light-emitting diodes (LEDs).
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高影响因子
PHYSICA SCRIPTA
·
2020
·Vol. 95
·期 10
·105705
·
IF 1.985
Xiaoyong Gao,Xin Zhang
Compositional stability of perovskites is crucial for perovskite solar cells (PSCs) application because of directly affecting the performance of PSCs. Highly crystallized perovskite MAPbBr3 (MA = CH3NH3) with micronscale crystallites are usually fabricated via the one-step sol-gel process that uses strongly coordinating organic solvents. The two-step sol-gel process using weakly coordinating organic solvent is rarely used to fabricate MAPbBr3 films with relatively small crystallites. However, the two-step sol-gel process is preferred to fabricate PSCs because the residual PbBr2 can prevent the direct contact between electron- and hole-transporting layers. Thus in this work, perovskite MAPbBr3 films are fabricated via two-step sol-gel process using weakly coordinating isopropanol solvent. The compositional stability in dry ambient air and related optical properties of the films are intensively studied by a technique of post-annealing. A compositional transition from MAPbBr3 to PbBr2 occurs with increase of post-annealing temperature (Tpa). The product PbBr2 begins to form in the MAPbBr3 films at approximately 130 °C Tpa, and MAPbBr3 is fully thermally degraded to PbBr2 at 170 °C Tpa. The compositional stability of the films in dry air is inherently determined by instable organic cations (MA)+ and small electronegativity of Br−. The perovskite film initially shows a redshifted and then a blueshifted optical absorption edge with increase of Tpa, which is due to the decrease in film tensile stress and to the enhancement in thermal degradation to PbBr2, respectively. The increase in number of PbBr2 particles and defects in the films remarkably reduces the intensity of the green emission of MAPbBr3.
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高影响因子
ACS Applied Optical Materials
·
2024
·
IF 0
Min Yang,Xi Wang,Nan Li,Jiatian Cheng,Chengzhi Xue,Ziwei Xu,Depeng Chu,Xiaojie Zhang,Yucheng Liu,Zhou Yang,Shengzhong Frank Liu
Due to their exceptional responses to X-ray exposure, lead halide perovskites are recognized as ideal candidates for high-spatial-resolution X-ray detectors. However, an effective method to deposit a large-area, submillimeter-thick, dense perovskite film for X-ray detection has been lacking. In this study, a strategy that combines saturated-solution-induced epitaxial growth with a large-area blade-coating process has been developed to produce large-size, submillimeter-thick CH3NH3PbBr3 perovskite films. The successive deposition of a saturated precursor film does not dissolve the underlying perovskite film. Instead, it promotes epitaxial crystal growth by controlling the crystal growth rate over the nucleation rate. The obtained films exhibit a columnar grain structure with fewer pinholes and negligible residual lattice strain. As a result, under an X-ray source with a working voltage of 40 kV, the obtained thick CH3NH3PbBr3 film achieves X-ray sensitivity of up to 1938 μC Gyair–1 cm–2 under −3 V bias, a reduced dark current drift of 1.78 × 10–4 nA s–1 V–1, and a detection limit of 47 nGyair s–1 under a −2 V bias; all the above are among the best performances reported for the CH3NH3PbBr3-based X-ray detectors. Using the point-to-point current scanning method, a clear X-ray image could be obtained. This study presents an effective approach for producing thick, dense, and crack-free perovskite films directly on substrates for future X-ray detection applications.
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DOI
Micromachines
·
2019
·Vol. 10
·期 7
·459
·
IF 2.426
Yuanming Zhou,Sijiong Mei,Dongwei Sun,Neng Liu,Wuxing Shi,Jiahuan Feng,Fei Mei,Jinxia Xu,Yan Jiang,Xianan Cao
High efficiency perovskite light-emitting diodes (PeLEDs) using PEDOT:PSS/MoO3-ammonia composite hole transport layers (HTLs) with different MoO3-ammonia ratios were prepared and characterized. For PeLEDs with one-step spin-coated CH3NH3PbBr3emitter, an optimal MoO3-ammonia volume ratio (0.02) in PEDOT:PSS/MoO3-ammonia composite HTL presented a maximum luminance of 1082 cd/m2and maximum current efficiency of 0.7 cd/A, which are 82% and 94% higher than those of the control device using pure PEDOT:PSS HTL respectively. It can be explained by that the optimized amount of MoO3-ammonia in the composite HTLs cannot only facilitate hole injection into CH3NH3PbBr3through reducing the contact barrier, but also suppress the exciton quenching at the HTL/CH3NH3PbBr3interface. Three-step spin coating method was further used to obtain uniform and dense CH3NH3PbBr3films, which lead to a maximum luminance of 5044 cd/m2and maximum current efficiency of 3.12 cd/A, showing enhancement of 750% and 767% compared with the control device respectively. The significantly improved efficiency of PeLEDs using three-step spin-coated CH3NH3PbBr3film and an optimum PEDOT:PSS/MoO3-ammonia composite HTL can be explained by the enhanced carrier recombination through better hole injection and film morphology optimization, as well as the reduced exciton quenching at HTL/CH3NH3PbBr3interface. These results present a promising strategy for the device engineering of high efficiency PeLEDs.
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高影响因子
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