ChemNanoMat
·
2019
·Vol. 5
·期 10
·1311-1316
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IF 3.431
Sihui Huang,Ting Zhang,Chunli Jiang,Ruijuan Qi,Chunhua Luo,Ye Chen,Hechun Lin,Jadranka Travas-sejdic,Hui Peng
Graphical Well-defined core/shell structured CH 3 NH 3 PbBr 3 /β-cyclodextrin nanodots are successfully prepared via host-guest interaction between β-cyclodextrin and hexylamine. The nanodots show high luminescence with photoluminescence quantum yields of 89.7% in solution and 38.0% in solid state. They also exhibit superior stability against water, heat and UV light due to the formation of a β-CD shell, which gives them great potential for optoelectrical and biological applications. Luminescent lead halide perovskite nanocrystals (LHP NCs) have attracted great attention. This work reports the synthesis of well-defined core/shell structured CH 3 NH 3 PbBr 3 /β-cyclodextrin (MAPbBr 3 /β-CD) nanodots via host-guest interaction between β-cyclodextrin and hexylamine. The MAPbBr 3 /β-CD nanodots show high luminescence with photoluminescence quantum yields (PLQYs) of 89.7% in solution and 38.0% in solid state. The MAPbBr 3 /β-CD nanodots have superior stability in water, under heat and UV light exposure due to the formation of a β-CD shell, which gives them great potential for optoelectrical and biological applications.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Diwei Zhang,Wei Zhou,Quanlin Liu,Zhiguo Xia
The increasing demands for optical anti-counterfeiting technology require the development of versatile luminescent materials with multiple models and tunable photoluminescence. Herein, the combination of luminescent perovskite nanocrystals and lanthanide-based metal–organic frameworks (Ln-MOFs) has been developed to offer such a high-tech anti-counterfeiting solution. The hybrid materials have been fabricated via the encapsulation of perovskite CH3NH3PbBr3 nanocrystals in europium-based metal–organic frameworks (Eu-MOFs) and they display multistage anti-counterfeiting behavior. CH3NH3PbBr3@Eu-MOF hybrids were developed in a two-step process, where the PbBr2@Eu-MOF precursor was formed first and, then, the composites can be formed quickly by the addition of CH3NH3Br into the precursors. Accordingly, the hybrid composites exhibited both excitation wavelength and temperature-dependent luminescence properties in the form of powders or films. Furthermore, the photoluminescence of the CH3NH3PbBr3@Eu-MOF composites can be quenched and recovered through water immersion and CH3NH3Br conversion, and the anti-counterfeiting applications have also been discussed. Therefore, this finding will open the opportunity to fabricate the hybrid materials with controlled photoluminescence properties, and it also acts as the emerging anti-counterfeiting materials in versatile fields.
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ADVANCED MATERIALS
·
2017
·Vol. 29
·期 16
·1602639
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IF 19.791
Hua-Shang Rao,Wen-Guang Li,Bai-Xue Chen,Dai-Bin Kuang,Cheng-Yong Su
Organometal trihalide perovskites have been attracting intense attention due to their enthralling optoelectric characteristics. Thus far, most applications focus on polycrystalline perovskite, which however, is overshadowed by single crystal perovskite with superior properties such as low trap density, high mobility, and long carrier diffusion length. In spite of the inherent advantages and significant optoelectronic applications in solar cells and photodetectors, the fabrication of large-area laminar perovskite single crystals is challenging. In this report, an ingenious space-limited inverse temperature crystallization method is first demonstrated to the in situ synthesis of 120 cm 2 large-area CH 3 NH 3 PbBr 3 crystal film on fluorine-doped tin oxide (FTO) glass. Such CH 3 NH 3 PbBr 3 perovskite crystal film is successfully applied to narrowband photodetectors, which enables a broad linear response range of 10 −4 –10 2 mW cm −2 , 3 dB cutoff frequency ( f 3 dB ) of ≈110 kHz, and high narrow response under low bias −1 V.
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JOURNAL OF MODERN OPTICS
·
2023
·
IF 1.3
Sizhong Yi,Yuanhao Huang,Jie Zou,Yuheng Wang,Jiawen Jian,Qinghui Jin,Xiaowei Zhang,Xin Zhang
Recently, metal halide perovskite quantum dots (MHPQDs) have attracted considerable interest in sensing activities due to their excellent optoelectronic properties and high surface activity. Here, aiming for heavy metal detection, we proposed an ultrasensitive turn-off fluorescent probe based on MAPbBr3 MHPQDs for the measurement of copper ions in an organic solvent. A low limit of detection (LOD) of 5.6nM was achieved and the test range was recorded from 0nM to 100nM. In order to achieve this high sensitivity, a thin film layer of electrospun polystyrene(PS) nanofibre was introduced for the structural support of MHPQDs, by which the sensitivity increased two orders of magnitude. The quenching mechanism is also discussed in the paper. We believe the electron transfer effect between Cu2+ and perovskite QDs made the main contribution for turn off sensing in our prototype device.
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RSC Advances
·
2018
·Vol. 8
·期 2
·1132-1139
·
IF 2.936
Xiaoming Fu,Zhiwei Peng,Chi Zhang,Yong Xia,Jianbing Zhang,Wei Luo,L. Jay Guo,Honglang Li,YuHuang Wang,Daoli Zhang
Organometal halide perovskite nanocrystals hold vast potential for application in photovoltaics, light emitting diodes, low-threshold lasers, and photodetectors due to their size-tunable bandgap energies and photoluminescence as well as excellent electron and hole mobilities. However, the synthesis of such nanocrystals typically suffers from poor structural stability in solution and the coexistence of lamellate nanocrystals (nanoplatelets) and spherical nanocrystals (nanoparticles). Here we show that the pure nanoparticle morphology of CH3NH3PbBr3 nanocrystals can be realized by employing lead oleate (Pb(C17H33COO)2) as the sole lead source and controlled using short- and long-chain mixed alkyl ammonium. These nanocrystals are monodispersed (2.2 ± 0.4 nm in diameter), highly fluorescent (with a quantum yield approaching 85%), and highly stable in the solution (for more than 30 days). Comparative studies reveal that the shape of CH3NH3PbBr3 nanocrystals is strongly dependent on the lead source, PbBr2 and Pb(C17H33COO)2, and evolves as a function of the ratio of short- and long-chain alkyl ammoniums in the precursors. At an optimal short to long-chain alkyl ammonium ratio of 4 : 6, the growth of CH3NH3PbBr3 nanoplatelets can be selectively suppressed with Pb(C17H33COO)2 as the sole lead source, enhancing the overall photoluminescence quantum yield of the produced CH3NH3PbBr3 nanocrystals. This work reveals important new insights for controlled synthesis of perovskite nanocrystals with pure crystal shape and significantly improved photoluminescence properties and stability.
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Advanced Optical Materials
·
2016
·Vol. 4
·期 11
·1732-1737
·
IF 5.359
Wen-Gao Lu,Cheng Chen,Dengbao Han,Linhua Yao,Junbo Han,Haizheng Zhong,Yongtian Wang
Graphical The comparison between organic–inorganic CH 3 NH 3 PbBr 3 quantum dots and all inorganic halide perovskite CsPbBr 3 quantum dots allows to understand the structural difference and corresponding optical properties. Using Z-scan measurements, it is revealed that colloidal CH 3 NH 3 PbBr 3 exhibits enhanced two-photon absorption properties compared to those of CsPbBr 3 quantum dots due to their structural difference.
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Journal of Materials Chemistry C
·
2024
·
IF 5.7
Xuyang Liu,Chao Shi,Dongxu Guang,Lijuan Yao,Bobo Li,Xuan Fang,Mingxia Qiu,Dan Wu,Peigang Han
Metal halide perovskites have triggered numerous studies in the application of optoelectronic devices. In this work, we incorporated Ce3+ ions into the MAPbBr3 perovskite to extend the photoluminescence spectrum from the green light region to red light region, which can be attributed to the dopant-induced self-trapped exciton (STE) emission. Furthermore, the non-equivalent substitution of Ce3+ ions for the Pb2+ ions can result in extra electrons, thus can change the type of dominant carriers and improve the carrier mobility. The MAPbBr3:Ce based photodetector exhibited a broadband photodetection capability over a wide range from 340 nm to 650 nm. In addition, after doping Ce3+ ions, the maximum device responsivity, detectivity and external quantum efficiency were efficiently improved. These results provide a new approach to highly-efficient and broadband-detecting photoconductive photodetectors.
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ACS Nano
·
2022
·
IF 18.027
Huanyu Zhang,Tingxiu Yu,Chaoqiang Wang,Ruofei Jia,Azhar Ali Ayaz Pirzado,Di Wu,Xiujuan Zhang,Xiaohong Zhang,Jiansheng Jie
Micro-/nanosized organic–inorganic hybrid perovskite single crystals (SCs) with appropriate thickness and high crystallinity are promising candidates for high-performance electroluminescent (EL) devices. However, their small lateral size poses a great challenge for efficient device construction and performance optimization, causing perovskite SC-based light-emitting diodes (PSC-LEDs) to demonstrate poor EL performance. Here, we develop a facile liquid-insulator bridging (LIB) strategy to fabricate high-luminance PSC-LEDs based on single-crystalline CH3NH3PbBr3 microflakes. By introducing a blade-coated poly(methyl methacrylate) (PMMA) insulating layer to effectively overcome the problems of leakage current and possible short circuits between electrodes, we achieve the reliable fabrication of PSC-LEDs. The LIB method also allows us to systematically boost the device performance through crystal growth regulation and device architecture optimization. Consequently, we realize the best CH3NH3PbBr3 microflake-based PSC-LED with an ultrahigh luminance of 136100 cd m–2 and a half-lifetime of 88.2 min at an initial luminance of ∼1100 cd m–2, which is among the highest for organic–inorganic hybrid perovskite LEDs reported to date. Moreover, we observe the strong polarized edge emission of the microflake-based PSC-LEDs with a high degree of polarization up to 0.69. Our work offers a viable approach for the development of high-performance perovskite SC-based EL devices.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Jiyuan Chen,Chao Sun,Yulong Xiang,Xue-Lu Wang,Ye-Feng Yao
Organic-inorganic hybrid halide perovskites have emerged as promising photocatalysts for hydrogen production because of their high absorption coefficients and large carrier diffusion lengths. However, the synthesis and development of organic–inorganic perovskite bromide photocatalysts have not been fully explored. Herein, we report on a novel high-activity Bismuth (Bi) doped CH 3 NH 3 PbBr 3 (MAPbBr 3 ) photocatalyst that was successfully synthesized using the reverse-temperature crystallization method. This material exhibited a reduced band gap and increased free-carrier concentration compared to pure MAPbBr 3 . Molecular dynamics and lattice changes within the photocatalyst were systematically investigated using solid-state nuclear magnetic resonance spectroscopy (NMR). The photocatalyst employs hypophosphorous acid (H 3 PO 2 ) as a stabilizer and platinum (Pt) as a co-catalyst in the photocatalytic hydrogen bromide (HBr) splitting system, achieving a hydrogen evolution rate of 3946.52 μmol·g −1 ·h −1 under visible light irradiation. Our experimental results suggest that the enhanced photocatalytic performance is attributed to Bi doping, which modifies the charge distribution in the region of the lead (Pb) octahedron, thereby promoting effective charge separation and improving the hydrogen production efficiency. This study provides new insights into the photocatalytic hydrogen production capabilities of organic–inorganic hybrid bromide perovskites.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Dongwei Feng,Peng Huang,Yunfei Miao,Axin Liang,Xuan Wang,Bo Tang,Huipeng Hou,Mingxing Ren,Shimeng Gao,Lina Geng,Aiqin Luo
Developing cost-effective, ease-to-use and sensitive cholesterol sensors is of great importance. Photoelectrochemical (PEC) sensor has exhibited their potential with low cost, simple instrumentation, easy miniaturization, and high sensitivity. Organometal lead halide perovskites (MAPbX 3 ) with exceptional opto-electronic properties have been appealing materials for optoelectronic devices. Whereas the extreme sensitivity of MAPbX 3 towards even moisture has always restricted their application in biological use. Here we report a novel MAPbX 3 photoelectrochemical cholesterol sensor with water stability. The titanium dioxide inverse opal (TiO 2 IOPCs) and CH 3 NH 3 PbBr 3 quantum dot heterojunction on ITO glass exhibited a remarkably increased photoelectric current density of approximately 40 μA/cm 2 . The further encapsulation within the imprinted polymer presented high selectivity towards cholesterol and significantly improved the stability of perovskites as well. Linear detection of cholesterol in buffer was achieved with the detection limit of 2.51 × 10 - 10 mol/L, lower than that of the reported cholesterol PEC sensor in aqueous buffer. Recovery rates in serum were also obtained with the cholesterol concentration lower than the reported imprinted polymer based (photo)electrochemical sensor. Additionally, the photocurrent intensity under continuous emission was maintained at 80% after immersing this sensor in an aqueous solution for 500 s. The storage stability was more than 20 days. Here we present the first MAPbX3 perovskite-based sensor applicable in aqueous samples with super sensitivity and selectivity, which promote the perovskite nanomaterial-mediated sensing of biologically important species.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Junyang Yin,Yujie Yuan,Jian Ni,Jiayi Guan,Xiaojun Zhou,Yue Liu,Yi Ding,Hongkun Cai,Jianjun Zhang
Obtaining a perovskite light-absorbing layer with good crystallization, low defect concentration, good stability, and well-matched energy levels is critical to obtaining high-efficiency perovskite solar cells (PSCs). Here, a hybrid PSC with a graded band gap is explored using MAPbBr3 (MA = CH3NH3) and MAPbBr0.9I2.1 quantum dots (QDs) as component cells. We have creatively designed a solar cell device with a double-QD structure [indium tin oxide (ITO)/SnO2/perovskite:MAPbBr3 QDs/MAPbBr0.9I2.1 QDs/Spiro-OMeTAD/Au]. A better crystal film of the perovskite absorption layer can be obtained because the MAPbBr3 QDs are doped in an antisolvent, which induces nucleation and growth in the polycrystalline perovskite. In addition, we expect that digestive ripening occurred in the crystallization, and the oleic acid ligands on the surface of the QDs disintegrate during the doping process and transfer to the surface of the perovskite absorption layer finally; it follows that the hydrophobicity and stability of the perovskite film are greatly enhanced. Moreover, a thin film of MAPbBr0.9I2.1 QDs is introduced between the perovskite absorption layer and the hole layer, acting as an energy-level ladder, which leads to well-matched energy levels, an increase in fill factor (FF), and an enhanced hole transport capability. In particular, the mechanism of the crystallization process involving the effect of oleic acid ligands on the interior and surface of the perovskite film is fully discussed here. The final research results from the PSCs show that both high efficiency and long-term stability are achieved successfully by this design strategy.
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Advanced Optical Materials
·
2024
·
IF 8
Jun Xing,Yue Sun,Xiaorui Huang,Shengrong He,Ziyuan Huang,Ying Li,Wei Li,Weili Yu
High-performance light-emitting/detecting bifunctional optoelectronic devices based on halide perovskites are hindered by the less efficient carrier transport and radiative recombination processes. The density of defects (i.e., surface and bulk defects) is the main factor affecting carrier transport, radiation recombination, and determining performance in perovskites. Therefore, techniques to effectively regulate defects are highly needed. Here, a convenient and effective strategy, electrical doping, is proposed to flexibly regulate defect density, resulting in dramatically enhanced light-emitting (i.e., fluorescence and carrier lifetime) and light-detecting performance (i.e., hole mobility, photo-responsivity, and photo-detectivity) simultaneously. An improved carrier transport model in CH 3 NH 3 PbBr 3 (MPB) single-crystal thin-film (SCTF) is proposed to elucidate the regulation mechanism of defects and carrier transport under electrical doping. These results show that the surface defect density can be effectively reduced by 47.49% under optimal electrical poling intensity (0.168 V µm −1 ), and photoluminescence intensity and carrier lifetime can be increased by 259% and 89.98%, respectively. Furthermore, planar MPB SCTF photodetector exhibits hole mobility increased by 14.97%, photo-responsivity increased by 82.78%, and photo-detectivity increased by 868% at 0.168 V µm −1 . Particularly, a record photo-detectivity of 3.53 × 10 13 Jones is achieved under electrical doping. This study provides guidance for flexibly adjusting defect density and optimizing perovskite SCTFs light-emitting/detecting bifunctional devices.
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