OPTICAL MATERIALS
·
2022
·
IF 3.754
Wei Liu,Huidong Xie,Xiaoling Guo,Kangkang Wang,Chang Yang,Na Wang,Chengmin Ge
CsPbBr 3 perovskite quantum dots/polymethyl methacrylate composites were prepared by a ball milling method, using PMMA as polymer matrix and cesium stearate, lead stearate, and KBr as perovskite sources. We investigated the stability of the composites against UV light , heat, ethanol, and water vapor and evaluated the luminescence performance of the products. The results show that the 1.5% CsPbBr 3 PQDs/PMMA composite prepared by the present method exhibited excellent performance, with a PLQY up to ∼78% and a high stability. The luminous intensity remained at 80%, 87%, 53%, 59%, and 64% of its initial value under ultraviolet light irradiation for 12 days, 467.5 nm LED irradiation for 10 days, heating at 60 °C for 10 days, erosion in water vapor at 95% relative humidity and 25 °C for 90 h, and soaking in ethanol for 3 h, respectively. The luminous efficiency of a white light-emitting diode fabricated with the CsPbBr 3 PQDs/PMMA composite was 76.73 lm·W −1 , and the RhB degradation percentage under visible light reached 92.2% within 60 min. The preparation method has the advantages of simple processing, solvent- and ligand-free nature, low synthesis temperature, and easy scalability; the as-prepared PQDs composites have high quantum yields and good environmental stability, which highlights the great application prospects of the present method.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Kai Xie,Siqi Zhang,Xiaofeng Wang,Chengkai Gong,Changda Zheng,Wenbo Xiao,Fan Li
All-inorganic CsPbX 3 perovskite quantum dots (QDs) have attracted extensive attention as the promising materials for new-generation optoelectronic applications. However, massive surface defects on CsPbX 3 QDs usually result in the inferior photoluminescence (PL) and environmental stability, severely hindering their real applications. For this sake, herein, an effective and low-cost post-synthetic treatment is employed to improve the optical properties and colloidal stability of CsPbBr 3 QDs via directly adding the ammonium hexafluorophosphate (NH 4 PF 6 ) into the as-synthesized CsPbBr 3 colloidal QDs. By virtue of the interaction between Pb 2+ and PF 6 − , as well as the similar chemical properties of PF 6 − and halides , the post-synthetic NH 4 PF 6 treatment is demonstrated to effectively passivate surface defects on CsPbX 3 QDs and form the Br-rich organic-inorganic hybrid passivation mode. As a consequence, the NH 4 PF 6 -treated CsPbBr 3 QDs robust PL emission and long-term stability, which can be successfully applied in white light-emitting diodes (WLEDs), showcasing bright practical application potentials. Our work provides a novel and simple strategy for preparing CsPbBr 3 perovskite QDs with excellent PL and environmental stability, which will further promote their commercialization process.
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高影响因子
TALANTA
·
2023
·
IF 6.1
Yuanchao Lu,Yingcheng Tang,Ningxiang Yu,Xiaohua Nie,Xianghe Meng
Sensitively, accurately, and rapidly evaluating edible oils’ peroxide value (PV) is significant for safeguarding food quality and safety. However, the conventional detection methods are challenging to meet the above demands due to their complex operation, poor reproducibility, and professional personnel. The colorimetric method is an emerging technique to rapidly and on-site determine the PV of edible oils . CsPbBr 3 NCs, as a novel fluorescent-sensing material, have been applied in the chemical colorimetric analysis . However, the heavy use of high-toxic solvents (toluene, chloroform) in the CsPbBr 3 NCs colorimetric system significant-negatively influences the environment. This study evaluated the performances of CsPbBr 3 NCs in nine low-toxic solvents and investigated the potential response mechanism to PV. The results presented that CsPbBr 3 NCs in ethyl acetate displayed the highest photoluminescent intensity and the most uniform distribution. The results performed that the micro-morphology and crystal structure of CsPbBr 3 NCs in ethyl acetate were similar to that in toluene, demonstrating the potential excellent performance. Under optimum conditions, three methods, including photoluminescence (PL)-decreased, wavelength-shifted, and phone-based colorimetric methods, were established to evaluate PV with the LOD of 0.0034 g/100 g. The PV recovery rates in Soybean oil, Camellia oil, Linseed oil, and Olive oil were from 75.0% to 100.0%, with a relative error below 25%. Furthermore, it was believed that the decreased PL and shifted wavelength originated from the halogen substitution with the crystal-structure destructions and the surface-defect formations. Thus, developing the low-toxic colorimetric CsPbBr 3 NCs system with ethyl acetate could reduce the environmental influence and even enlighten the rise of other green detection methods for PV in edible oils.
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PubMed
高影响因子
Advanced Optical Materials
·
2021
·Vol. 9
·期 11
·2002130
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IF 9.926
Qinggang Zhang,Weilin Zheng,Qun Wan,Mingming Liu,Xiuping Feng,Long Kong,Liang Li
For the display applications of perovskite nanocrystals (NCs), the photoluminescence quantum yield (PLQY), emission linewidth, and operational stability are the main parameters that directly affect the performance of the optoelectronic device. High-temperature solid-state synthesis has been regarded as an eco-friendlier process to prepare perovskite NCs than colloidal synthesis. However, it is relatively difficult to control the sizes and size distribution of NCs at high temperatures, which usually results in a lower PLQY and wider emission. Here, highly stable CsPbBr 3 NCs with a high PLQY up to 93% and a narrow emission linewidth of 18 nm are successfully prepared by a hard-template solid-state synthesis at high temperature (600 °C). It is found that the precisely confined growth of NCs in the thermally stable and uniform pores of the mesoporous silica (MS) template is the main reason to achieve the high PLQY and narrow emission, and the pre-hydrolysis sealing strategy contributes to the exceptional stability. More surprisingly, the emission peak intensity of CsPbBr 3 /MS@SiO 2 is 3.8 times higher than that of the commercialized silicate green phosphor when encapsulated on the blue-chip with the same absorbance at 450 nm, which makes it an ideal down-conversion emitter for display applications.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 26
·15003-15011
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IF 12.732
Guixiang Xie,Xiaochun Lu,Jialong Duan,Yan Dong,Xiurong Jiang,Fengzhang Tu,Yanyan Duan,Qunwei Tang
An electron-transporting layer (ETL) with improved charge extraction-transfer kinetics and a perovskite film with improved quality highly determine the power conversion efficiency (PCE) of perovskite solar cells (PSCs). Herein, various alkali chlorides (MCl, M = Li, Na, K, Rb and Cs) are employed as passivators to simultaneously modulate the electronic properties of the underlying SnO2 ETL and to regulate the quality of the upper all-inorganic CsPbBr3 perovskite film. The primary results demonstrate that the detrimental oxygen vacancies at the SnO2 surface and under-coordinated Pb2+ in the perovskite film are counterbalanced by alkali chlorides, benefiting the PCE promotion of the carbon electrode based CsPbBr3 PSC. Because of the accelerated charge extraction, the reduced defects and the suppressed nonradiative recombination, the best device free of encapsulation tailored by the SnO2–RbCl ETL achieves a champion PCE as high as 10.04% with improved long-term stability under 80% relative humidity over 15 days, which is much higher than the 7.88% for the reference device. The proposed strategy demonstrates great promise for the development of highly-efficient PSCs with a defect engineering related concept.
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Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 41
·14409-14422
·
IF 7.059
Xingyue Liu,Xianhua Tan,Zhiyong Liu,Xuning Zhang,Tielin Shi,Guanglan Liao
CsPbBr3 photodetectors (PDs) are attracting tremendous attention for their superior properties, such as ultrafast light response and high chemical stability. However, the widely-used spin-coating technique involved in the preparation process of CsPbBr3 PDs restricts the construction of large-scale PD arrays, making it challenging for their applications in high-resolution image sensing. Here, we demonstrate fully vapor-deposited CsPbBr3 PDs with all the functional layers deposited through an evaporation route. The employment of an inexpensive copper(II) phthalocyanine (CuPc) hole conductor and the abandonment of the electron conductor can significantly decrease the whole production costs. An ultrathin MoO3 buffer layer is further introduced to passivate the defect densities of the CsPbBr3 perovskite and tailor the band alignment of the whole device. The reduced interface energy barrier and non-radiative recombination loss of the MoO3-modified devices are revealed by both experimental characterization and theoretical density functional theory (DFT) analysis. The best-performing MoO3-modified CsPbBr3 PD achieves an ultrafast response time of 0.96 μs, an ultrahigh on/off ratio of 1.17 × 106 and a detectivity of 5.22 × 1012 Jones at 0 V bias voltage. This performance is one of the best among all the self-powered electron/hole-conductor-free perovskite PDs. A large-area (57.8 cm2) image sensor comprising 25 × 25 CsPbBr3 PD arrays is further fabricated. Owing to the intrinsic advantages of the evaporation technique in depositing large-area and uniform films, the as-designed 625-pixel sensor exhibits a salient imaging capability. Our work opens up new avenues for the mass production of cost-effective, large-area and high-performing CsPbBr3 PD arrays for applications in image sensing.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Ming Wang,Songsheng Zheng,Chufeng Chai,Ziqi Fei,Leiming Zheng,Aodi Shi,Si Chen,Yufeng Zhang,Zhaolin Wang
Inorganic perovskite quantum dots (QDs) have attracted extensive attention from researchers in recent years, because of their good prospects in micro-LED for next generation lighting and display. However, the research on high quality and stable inorganic perovskite blue QDs is relatively backward, which limits its further applications in micro-LED. In the present work, crystalline silicotitanate (CST) is used as matrix and synthesized by hydrothermal method , then, Cs + ion replaces Na + ion in the tunnel in c-axis dimension of CST matrix by ion exchange, and finally, the CsPbBr 3 QDs are in situ anchored on the Cs + ion in the tunnel. The sizes of the as prepared CsPbBr 3 QDs are determined to be mostly less than 4 nm, which guarantees the as prepared CST: CsPbBr 3 QDs to have a brilliant blue emission peak at 463 nm with a narrow FWHM of less than 20 nm, and it can be excited by a broad n-UV light range from 300 to 400 nm and peak at 365 nm. A photoluminescent quantum yield of 88.34% is achieved. Furthermore, the as prepared CST: CsPbBr 3 QDs is demonstrated to have a good air and thermal stability with an average PL lifetime of 112.00 ns? The color gamut of CST: CsPbBr 3 QDS together with the commercial green (Sr, Ba) 2 SiO 4 : Eu 2+ and red (Sr, Ca)AlSiN 3 : Eu 2+ phosphors is calculated to be 114.12% of the NTSC standard. Therefore, the present pure blue CST: CsPbBr 3 QDs can be a potential backlight source for display devices.
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高影响因子
ADVANCED ENGINEERING MATERIALS
·
2020
·Vol. 22
·期 8
·2000162
·
IF 3.217
Qingxiao Meng,Jianyong Feng,Huiting Huang,Xiaopeng Han,Zhi Zhu,Tao Yu,Zhaosheng Li,Zhigang Zou
Both phase and morphology of perovskite films are very important for high-performance optoelectronic devices. Although a two-step method based on CsBr ethylene glycol monomethylether (EGME) solution can prepare pure-phase CsPbBr 3 films, they have a poor morphology due to excessive Ostwald ripening. Herein, a bi-solvent engineering strategy is demonstrated to simultaneously optimize phase and morphology of CsPbBr 3 films in a two-step solution method, which uses the bi-solvents of EGME and isopropanol (IPA) instead of EGME for CsBr solution at the second step. Optimizing the volume ratio of bi-solvents and immersion time can control the Ostwald ripening effectively and result in pure-phase, compact, and smooth CsPbBr 3 films. Finally, the prepared films are applied to perovskite solar cells (PSCs) with a structure of fluorine-doped tin oxide (FTO)/compact TiO 2 (c-TiO 2 )/CsPbBr 3 /carbon. In comparison with EGME, the champion power conversion efficiency (PCE) of devices from EGME/IPA bi-solvents increases from 3.57% to 7.29% owing mainly to higher coverage, smoother surface, and lower trap density of CsPbBr 3 films from EGME/IPA bi-solvents. This work provides a simple and efficient method for the preparation of high-quality CsPbBr 3 films.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Xin Zhang,Xiaoyong Gao,Xue Meng
Organic–inorganic hybrid perovskite solar cells (PSCs) have realized a 23.2% power conversion efficiency (PCE), thereby making the PSC application promising. However, the compositional instability of perovskites and PSCs in high-temperature and/or –humidity ambient air condition has restricted the PSC application. All–inorganic CsPbBr 3 -based PSCs can deal with the problem due to the high stability in heat and humidity of CsPbBr 3 . Perovskite CsPbBr 3 is highly crystallized with micronscale crystallites by Pb 2+ strongly coordinating with organic molecules in the one–step sol–gel process. By contrast, CsPbBr 3 crystalizes in nanoscale crystallites in the two-step sol-gel process using nonpolar or weakly coordinating organic solvent . The related study is rarely reported so far. Herein, we reported the fabrication of all–inorganic perovskite CsPbBr 3 films via the two–step sol–gel process using weakly coordinating methanol solvent. The impact of annealing temperature (T anneal ) was in particular studied on the film's microstructure and optical properties . The Increased T anneal restricts the production of byproduct Cs 4 PbBr 6 and greatly improves the film crystallization, thereby increasing the film's photoluminescence intensity and lifetime. A transition from the compressive stress to tensile stress in the films is observed at 250 °C T anneal . The red shift in optical absorption edge with increased T anneal is mainly due to the increased compressive stress and reduced tensile stress in the films.
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高影响因子
INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Xin He,Chao Yu,Mengmeng Yu,Jing Lin,Qiaoling Li,Yi Fang,Zhenya Liu,Yanming Xue,Yang Huang,Chengchun Tang
All-inorganic CsPbX3 (X = Cl, Br, I) perovskite quantum dots (QDs) have great potential for various applications due to their excellent photoluminescence properties. However, poor stability under long-term storage hinders their applications. Herein we report the utilization of porous boron nitride nanofibers (BNNFs) as a promising carrier for anchoring of CsPbBr3 QDs. Due to the good dispersion and immobilization of CsPbBr3 QDs, the resulting CsPbBr3/BNNF composites show excellent photostability and superior long-term storage stability in an air environment. Moreover, the CsPbBr3/BNNF composites exhibit an interesting ammonia-responsive behavior: i.e., a distinct decrease in photoluminescence intensity upon exposure to ammonia gas and the subsequent photoluminescence recovery after post-treatment in nitrogen gas. Even after treatment with ammonia gas for 3 h, the composites can still be recovered under nitrogen gas treatment. The fast response, reversibility, and stability of CsPbBr3/BNNF composites in the presence of ammonia gas could inspire a broader range of applications.
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Panting Liang,Pan Zhang,Aizhao Pan,Ke Yan,Yongsheng Zhu,Minyan Yang,Ling He
All-inorganic cesium lead halide perovskite nanocrystals (CsPbX3, X = Cl, Br, or I) present broad applications in the field of optoelectronics due to their excellent photoluminescence (PL), narrow spectral bandwidth, and wide spectral tunability. However, their poor stability limits their practical application. In this work, we successfully use an in situ crystallization strategy for growing and cladding CsPbBr3 perovskite nanocrystals in poly(vinylidene difluoride) (PVDF). The CsPbBr3 nanocrystals in the as-fabricated CsPbBr3@PVDF composites have an average diameter of 16–18 nm and a strong PL emission (537 nm), with a photoluminescence quantum yield exceeding 30%. In addition, the fabricated CsPbBr3@PVDF composites present improved resistance to heat and water preserving with remarkable optical performance, owing to the effective protection of PVDF. Moreover, the CsPbBr3 nanocrystals generated in PVDF can withstand temperatures up to 170 °C and can be completely immersed in water for 60 days while still retaining high PL intensity, which facilitate the practical application of CsPbBr3 perovskite nanocrystals. These CsPbBr3@PVDF composite films with remarkable optical performances and superior anti-interference ability have broad application prospects in optoelectronics as well as good potential as temperature sensors in mechanical engineering.
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高影响因子
Advanced Optical Materials
·
2019
·Vol. 7
·期 22
·1901075
·
IF 7.125
Yuting Cai,Ye Li,Le Wang,Rong-Jun Xie
In this paper, a facile synthesis of water-resistant CsPbBr 3 perovskite quantum dots (PQDs) loaded poly(methyl methacrylate) (PMMA) composite microspheres (CsPbBr 3 @PMMA) is reported. The method is based on the precipitation polymerization of methyl methacrylate in hexane in the presence of CsPbBr 3 PQDs and stabilizer. The CsPbBr 3 @PMMA microspheres show a tunable size and a narrow size distribution, with the CsPbBr 3 PQDs being uniformly dispersed in the PMMA microspheres. The effective incorporation of PQDs is attributed to the strong coordination interactions between Pb ions on the surface of PQDs and carbonyl groups (CO) from PMMA. Based on this mechanism, multicolor composite microspheres can be easily prepared through absorbing CsPbX 3 (X = Cl, Br, I) PQDs into blank PMMA microspheres. Protected by the PMMA microspheres, the imbedded CsPbBr 3 PQDs show improved water resistance and storage stability. Further, a wide-color-gamut (129%) white light-emitting diode (LED) is demonstrated by combining the green-emitting CsPbBr 3 @PMMA composite microspheres and red-emitting K 2 SiF 6 : Mn 4+ with a blue LED, which enables to be used as backlights for liquid crystal displays.
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