Journal of Physical Chemistry C
·
2023
·
IF 3.7
Wei Zhang,Dengfeng Luo,Shao-Fei Ni,Shunli Chen,Limei Cha,Ming-De Li,Li Dang
The combination of inorganic perovskite and graphene oxide has been demonstrated to be an efficient strategy for obtaining excellent optical and electrical properties. In this work, high-quality CsPbBr3 nanocrystals are loaded on graphene oxide (GO) to form GO-CsPbBr3 nanocomposites by post-mixing of the two materials. The photoluminescence spectra indicated that GO could dramatically quench the luminescence of the pristine-CsPbBr3 nanocrystals in the GO-CsPbBr3 nanocomposites, which is probably induced by the fast separation and transfer of the photogenerated hole–electron pair. The fast separation and transfer of the photogenerated hole–electron pair between GO and CsPbBr3 nanocrystals have been confirmed by an ultrafast transient absorption study, and a lifetime τ = 18.6 ± 4.1 ps of electron transfer from CsPbBr3 nanocrystals to GO could be obtained. In addition, the GO could significantly boost the photocurrent intensity; the photocurrent of GO-CsPbBr3 nanocomposites is about 2.5 times that of the pristine-CsPbBr3 nanocrystals. Photoelectrochemical switching on and off can be achieved by using intermittent visible light exposure. These results reveal that GO may act as an electron collector to extract electrons from CsPbBr3 nanocrystals, suggesting a new potential application of GO-CsPbBr3 nanocomposites for photocatalysis.
研究领域:
材料科学
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光学
·
物理化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Qingyun He,Enrou Mei,Xiaojuan Liang,Weidong Xiang
Here, polyvinyl butyral (PVB) films-protected CsPbBr 3 /Cs 4 PbBr 6 halide perovskite solids (HPSs) were successfully synthesized. The optical properties and structure of HPSs@PVB were studied, finding the photoluminescence quantum yields (PLQYs) of this novel composite material is as high as 60.4%. More importantly, HPSs@PVB has excellent thermal cyclability, water and ultraviolet (UV) resistance. In addition, HPSs@PVB was further applied to light emitting diodes (LEDs) and displays. By combining green-emitting HPSs@PVB and red-emitting CsPbBrI 2 NCs@PVB with InGaN 460 nm blue chip, white light emitting diode (WLED) device can be successfully fabricated. And the device exhibits good stability and the color gamut is as wide as 126%, reaching 94% of Rec. 2020. This work proposes a simple approach to solve the challenging stability issue of perovskite nanocrystals (NCs), having a positive implication for their practical application in LEDs and display backlights.
研究领域:
材料科学
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光学工程
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显示技术
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DOI
高影响因子
Laser & Photonics Reviews
·
2022
·Vol. 16
·期 7
·2100736
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IF 10.947
Baiqian Wang,Jiali Peng,Xin Yang,Wensi Cai,Hongbin Xiao,Shuangyi Zhao,Qianqian Lin,Zhigang Zang
Metal halide perovskite-based high-performance X-ray scintillator is considered as one of the most favorable candidates applied in the fields of medicine, industry, and science. However, the current X-ray scilltillators based on perovskites still suffer from the issue of poor stability, which impedes their further wide applications. Herein, a template assembled method to prepare large-size, flexible, and stable CsPbBr 3 @Polymethyl methacrylate composite films in ambient conditions is developed and their detection performance is studied. The composite films can maintain 94% and 81% of the initial PL intensity after 2000 cycles bending and storing in water over 2520 h, respectively. In addition, the prepared scintillators exhibit not only a low detection limit of 40.1 nGy air s −1 and a high spatial resolution of 8.0 lp mm −1 , but also an excellent tolerance against radiation (108 h). Thus, this simple but yet effective method would not doubt pave the way for further development of scintillators and might be well applicable to other metal halides.
研究领域:
材料科学
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医学影像
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辐射探测
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DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Zhen-Yu Chen,Qin-Long Hong,Hai-Xia Zhang,Jian Zhang
Improving the stability and charge transportation efficiency of lead halide perovskites is the key for their practical photocatalytic applications. Herein, we designed and synthesized a microporous boron imidazolate framework (BIF-122-Co) by cross-linking boron imidazolate ligands and benzene carboxylate with metal ions, which was further used as a host matrix to encapsulate CsPbBr3 perovskite via a sequential deposition route to obtain a composite material, CsPbBr3/BIF-122-Co. Due to the intimate host–guest interfacial contact in the composite material, BIF-122-Co not only provided a physical protective barrier for CsPbBr3 but also accelerated the photoinduced charge separation process in the photocatalytic CO2 reduction reaction. The work provided a guide for exploration of excellent perovskite/metal–organic framework (MOF) composites.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zhou Yuan,Le Han,Yuchi Zhang,Lufang He,Peng Liu,Yan Xu
Self-assembled inorganic metal halide perovskite composites with high emitting efficiency, tunable multimode emission and stimuli-responsive luminescence demonstrated great potential in diversified luminescence applications. Here, a novel CsPbBr 3 /EuWO 4 (OH) composite was successfully prepared through the surface adsorption of Pb 2+ ions on hydroxylated EuWO 4 (OH) microsheets and subsequent nucleation of CsPbBr 3 peroviskite quantum dots (PQDs) by the anti-solvent crystallization in CsBr containing N,N-dimethylformamide (DMF) solution. Due to the distinct fluorescent thermochromic switching properties of temperature-insensitive Eu 3+ and sensitive CsPbBr 3 PQDs emitting centers, the resultant CsPbBr 3 /EuWO 4 (OH) composite exhibits excellent ratiometric temperature sensing performance. The CsPbBr 3 /EuWO 4 (OH) thermometer based on the fluorescence intensity ratio (FIR) technique originating from emissions of Eu 3+ to CsPbBr 3 PQDs was then explored with a high temperature sensitivity (S r ) of 5.8 % ℃ −1 at 54 ℃. In addition, a high-security-level information encryption scheme was proposed by utilizing the excitation-wavelength-dependent switchable fluorescence of CsPbBr 3 /EuWO 4 (OH) composite. This study provides a simple and feasible strategy for assembling dual-emission CsPbBr 3 /EuWO 4 (OH) composite, showing potential applications in optical ratiometric thermometry and information encryption fields.
研究领域:
材料科学
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光学
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DOI
高影响因子
INORGANIC CHEMISTRY
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2022
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IF 5.436
Wei Shen,Liu Yang,Jingting Feng,Yanfeng Chen,Wei Wang,Jianbin Zhang,Lihui Liu,Kun Cao,Shufen Chen
Generally, solvents used to synthesize perovskite NCs are toxic, which leads to waste liquid pollution and environmental degradation. Herein, we developed a novel environmentally friendly polar solvent method to synthesize CsPbBr3 nanocrystals (NCs). Over 65% photoluminescence quantum yield (PLQYs) for NCs could be maintained over 45–850 h of storage time, and a maximum was 78% at 750 h. Such amazing stability in polar solvents is dominated by a ripening process, which heals surface defects. Additionally, their solid films also exhibited good moisture stability. Furthermore, CsPbBr3 NCs were applied to inkjet-printing to prepare high-quality patterned films.
研究领域:
材料科学
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环境科学
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光学
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DOI
PubMed
高影响因子
COMPOSITES COMMUNICATIONS
·
2021
·
IF 6.617
Bo Yang,Wentuan Bi,Fengxian Jin,Xiaojia Ma,Sheng-Qi Guo
Photodetectors that can directly convert optical signals into electrical signals offer great application prospects in next-generation optoelectronic nanodevices . But to-date, unsatisfactory light absorption and charge carrier separation efficiency still limit their applications. Herein, we developed a facile and low-cost surface molecular engineering strategy to construct high-performance photodetector with CsPbBr3 perovskite nanosheets . Because of the improved optical absorption and charge transfer behavior, CsPbBr 3 /poly(3-hexylthiophene) (P3HT) film photodetector presents a fast response speed, excellent stability and reproducibility. We anticipate that our results not only demonstrate the effectiveness of surface molecular engineering in film photodetector design, but also provide a facile and cost-effective strategy applicable for broadband light optical sensor production.
研究领域:
材料科学
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光电子学
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纳米技术
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DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Boyuan Yang,Wangshu Xu,Shu Tang,Wanfei Shi,Jingjing Dong,Hao Liu,Jie Xing,Huiying Hao
Stability is a crucial factor in the commercialization of perovskite solar cells (PSCs). CsPbBr3 PSCs, despite being less efficient than organic–inorganic hybrid PSCs, have a significant advantage in terms of stability. This makes them have promising potential for commercialization. In this study, high-quality all-inorganic CsPbBr3 perovskite films were prepared by using a multistep method in ambient air conditions. The crystalline quality of the CsPbBr3 films was improved by adding an appropriate amount of ammonium acetate (NH4Ac) to the PbBr2 precursor solution. Finally, carbon-based hole transport layer-free CsPbBr3 PSCs were fabricated by selecting NH4Ac-optimized light-absorbing layers and carbon electrodes that have a good commercialization prospect. Compared with control devices, the NH4Ac-optimized CsPbBr3 cell devices significantly improved in both efficiency and stability. The photoelectric conversion efficiency increased from 7.80% to 9.68%. This study provides an effective strategy for the preparation of high-quality films by using a multistep method and is also of great significance in promoting the commercialization of PSCs.
研究领域:
材料科学
·
太阳能技术
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DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Xingyue Liu,Zhiyong Liu,Xianhua Tan,Haibo Ye,Bo Sun,Shuang Xi,Tielin Shi,Zirong Tang,Guanglan Liao
All-inorganic CsPbBr 3 is attracting tremendous attentions in photovoltaic field due to its superior stability. However, CsPbBr 3 perovskite always suffers from a poor crystallinity and film morphology. Many efforts have been paid on the CsBr deposition process to improve the film quality, while few attentions are paid on the crystallization kinetics of the PbBr 2 framework film. Here, we demonstrate a novel antisolvent-washing strategy for the PbBr 2 film for the first time to fabricate high-quality CsPbBr 3 film. This technique has a significant impact on the nucleation and growth of PbBr 2 crystals. As-prepared CsPbBr 3 films exhibit more homogeneous with higher crystallinity and coverage as well as larger grain sizes compared to those untreated ones. The best-performing antisolvent-treated perovskite solar cell achieves a scanned power conversion efficiency of 8.55%, which is an excellent efficiency for planar CsPbBr 3 cells reported yet. This enhancement can be mainly attributed to the more effective charge transport and suppressed non-radiative recombination caused by the reduced defect densities . Moreover, our devices show superb stability when stored in air for 1000 h and upon persistent thermal attack at 80 °C. Our work provides a new train of thought for controlling the growth dynamics and film morphology of CsPbBr 3 films.
研究领域:
材料科学
·
光伏技术
·
太阳能电池
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DOI
高影响因子
JOURNAL OF CRYSTAL GROWTH
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2017
·
IF 1.751
Mingzhi Zhang,Zhiping Zheng,Qiuyun Fu,Zheng Chen,Jianle He,Sen Zhang,Cheng Chen,Wei Luo
As a typical representative of all-inorganic lead halide perovskites, cesium lead bromine (CsPbBr 3 ) has attracted significant attention in recent years. The direct band gap semiconductor CsPbBr 3 has a wide band gap of 2.25 eV and high average atomic number (Cs: 55, Pb: 82 and Br: 35), which meet most of the requirements for detection of X- and γ-ray radiation, such as high attenuation, high resistivity, and significant photoconductivity response. However, the growth of large volume CsPbBr 3 single crystals remains a challenge. In this paper, the synthesis of CsPbBr 3 polycrystalline powders by a chemical co-precipitation method was investigated and the optimum synthesis conditions were obtained. A large CsPbBr 3 single crystal of 8 mm diameter and 60 mm length was obtained by a creative electronic dynamic gradient (EDG) method. X-ray diffraction (XRD) patterns and X-ray rocking curve showed that the CsPbBr 3 crystal preferentially oriented in the (1 1 0) direction and had a low dislocation density and small residual stress in the crystal. The IR and UV–Vis transmittance and temperature-dependent photoluminescence (PL) spectra showed the crystal had a good basic optical performance. The almost linear current-voltage (I-V) curves implied good ohmic contact between the electrodes and crystal surfaces. The resistivity of the crystal was calculated 10 9 –10 10 Ω cm. The above results showed that the quality of the obtained crystal had met the demand of optoelectronic applications.
研究领域:
材料科学
·
半导体物理
·
晶体生长
·
辐射检测
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DOI
高影响因子
Frontiers in Chemistry
·
2025
·
IF 4.2
Xianqi Wei,Jiayi Lu,Silong Zhang,Jiashu Tang,Shichao Wu,Tengbo Lv,Xiaoli Wang
CsPbBr 3 (CPB) perovskite has demonstrated unique advantages as a photoelectric material. However, its stability and optoelectronic properties exhibit significantly susceptibility to environmental conditions during practical applications. Additionally, the synthesis of CPB often involves complex procedures and stringent requirements for the experimental environment, resulting in low yield. In this study, we employed an aqueous-phase synthesis method to incorporate strontium into CPB, aiming to enhance the long-term stability of the perovskite in aqueous solutions. And the introduction of strontium (Sr) is expected to improve the photoluminescent properties of the perovskite. The results demonstrate that the synthesized perovskite remains stable in aqueous solution for up to 264 h, with enhanced photoluminescence intensity and a blue shift attributed to the incorporation of strontium. This approach significantly increases the potential value of CPB perovskite for applications in optoelectronic materials and devices.
研究领域:
材料科学
·
光学
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DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 32
·1902533
·
IF 15.621
Lingling Li,Ziyi Zhang,Ying Chen,Qin Xu,Jian-Rong Zhang,Zixuan Chen,Yun Chen,Jun-Jie Zhu
Lead halide perovskite quantum dots (QDs) are promising electrochemiluminescence (ECL) nanoemitters due to their fascinating photophysical properties. However, due to their poor structural stability against the external environment, the trade-off between their colloidal stability and carrier injection/transport efficiency is a major challenge in the advancement of perovskite-based ECL technology. In this work, intense and stable ECL from CsPbBr 3 (CPB) QDs is achieved by simultaneously encapsulating CPB QDs and coreactant (CoR) into in situ generated SiO 2 matrix via hydrolysis of tetramethyl orthosilicate. The well-designed architecture of the as-obtained CPB-CoR@SiO 2 nanocomposites (NCs) guarantees not only greatly improved stability thanks to the peripheral SiO 2 protecting matrix, but also efficient self-enhanced ECL between CPB and the intra-coreactants. Consequently, by elaborately selecting the CoR molecules with different tertiary/secondary amines and functional groups, multifold higher (up to 10.2 times) ECL efficiencies are obtained for the CPB-CoR@SiO 2 NCs alone in reference to the standard Ru(bpy) 3 2+ /tri- n -propylamine system. This work provides an efficient design strategy for obtaining stable and highly efficient ECL from perovskite QDs, and offers a new perspective for the development and application of perovskite-based ECL system.
研究领域:
材料科学
·
分析化学
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DOI
高影响因子
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