Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 25
·8431-8437
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IF 6.4
Sixin Chen,Weiwei Liu,Meng Xu,Pan Shi,Menghua Zhu
CsPbBr3 perovskite materials have demonstrated excellent X-ray detection performance, including high sensitivity, owing to their high absorption coefficient, high carrier mobility, and long carrier lifetime. However, the large-scale preparation of CsPbBr3 perovskite films characterized by a flexible and large area can still hardly be accomplished, which impedes their application for X-ray imaging. Herein, an improved electrospray method is developed to successfully prepare a flexible CsPbBr3 film with an area of 5 × 5 cm2. By optimizing the solvent system and the temperature of crystal growth, a highly crystalline film is obtained without pinholes or microcracks. An assembled interdigital detector displays a resistivity of 1.14 × 109 Ω cm and outstanding performance with an X-ray sensitivity of 823.12 μC Gyair−1 cm−2 under a 20 kVp X-ray source. Furthermore, the X-ray detection limit of the flexible CsPbBr3 film is 14.61 nGyair s−1. The facile preparation of flexible CsPbBr3 films and their superior X-ray detection performance exhibit their huge potential applications in the areas of X-ray imaging, non-destructive inspection and other photoelectric devices.
研究领域:
材料科学
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光电子学
·
辐射探测
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钙钛矿电子学
·
纳米制造
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高影响因子
JOURNAL OF LUMINESCENCE
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2025
·
IF 3.6
Changbo Deng,Yu Zhang,Dachuan Zhang,Zhulu Xie,Qiuping Huang,Zhengping Fu,Yalin Lu
Direct optical patterning of perovskite colloidal quantum dots (QDs) mediated by surface chemistry has emerged as a critical focus for new display technologies. However, the instability of weakly bound ligands on QD surfaces significantly restricts their practical applications. To address this challenge, we propose a novel and straightforward strategy that utilizes the strongly binding zwitterionic photocrosslinkable ligand 2-methacryloyloxyethyl phosphorylcholine (MPC) via ligand exchange, enabling direct optical patterning of CsPbBr 3 QDs without requiring an inert environment or precise ultraviolet (UV) light intensity control. The MPC ligand exhibits dual functionality: it effectively passivates QD surface defects, achieving a photoluminescence quantum yield (PLQY) of 83.8 ± 1.4 % for CsPbBr 3 QD colloidal solutions, while simultaneously enabling direct optical patterning in ambient air. This patterning mechanism relies on methacrylate groups that initiate polymerization upon UV irradiation, forming a robust crosslinked network. The resulting patterns exhibit a high PLQY of 72.5 ± 5.9 %. Additionally, theoretical calculations reveal that the planar orientation of MPC ligands on the QD surface minimizes inter-QD spacing, promoting the formation of dense and smooth films. This innovative approach not only enhances the optical performance of CsPbBr 3 QDs but also paves the way for their practical implementation in high-quality, vivid image displays.
研究领域:
材料科学
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纳米技术
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光电子学
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显示技术
·
表面化学
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Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 29
·10971-10978
·
IF 5.7
Jiachen Zhang,Shuyue Feng,Qun Zhang
We present a mechanistic study of harnessing Auger suppression through a strategy of facet engineering on two contrasting perovskite systems of facet-controlled CsPbBr3 nanocrystals (CPB NCs), i.e., dodecahedron CPB (d-CPB) NCs vs. cubic CPB (c-CPB) NCs. It is found that d-CPB achieves a better suppression of Auger recombination than c-CPB. We employe ultrafast transient absorption spectroscopy, photoluminescence spectroscopy and spectroscopic ellipsometry to interrogate the underlying mechanisms from multiple perspectives, mainly addressing the volume scaling, dielectric screening and polaronic effects. The static dielectric screening effect is revealed to prevail over the dynamic polaronic screening effect. Compared to c-CPB NCs featuring nonpolar facets, d-CPB NCs featuring polar facets exhibit an elevated dielectric response (in the optical-frequency region) and strengthened screening of electron–hole Coulomb interaction, which accounts for the observed improvement in Auger suppression. As a proof of principle, the achieved modulation of Auger recombination via facet engineering is successfully materialized by a set of performance tests on c-CPB/d-CPB NC-based light-emitting diodes.
研究领域:
材料科学
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纳米技术
·
光电子学
·
钙钛矿光子学
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xin Li,Jiale Liu,Guocan Jiang,Xinyu Lin,Jin Wang,Zhengquan Li
Aerogels, especially MXene aerogels, are an ideal multifunctional platform for developing efficient photocatalysts for CO 2 reduction because they are featured by abundant catalytic sites, high electrical conductivity, high gas absorption ability and self-supported structure. However, the pristine MXene aerogel has almost no ability to utilize light, which requires additional photosensitizers to assist it in achieving efficient light harvesting. Herein, we immobilized colloidal CsPbBr 3 nanocrystals (NCs) onto the self-supported Ti 3 C 2 T x (where T x represents surface terminations such as fluorine, oxygen, and hydroxyl groups) MXene aerogels for photocatalytic CO 2 reduction. The resultant CsPbBr 3 /Ti 3 C 2 T x MXene aerogels exhibit a remarkable photocatalytic activity toward CO 2 reduction with total electron consumption rate of 112.6 μmol g -1 h - 1 , which is 6.6-fold higher than that of the pristine CsPbBr 3 NC powders. The improvement of the photocatalytic performance is presumably attributed to the strong light absorption, effective charge separation and CO 2 adsorption in the CsPbBr 3 /Ti 3 C 2 T x MXene aerogels. This work presents an effective perovskite-based photocatalyst in aerogel form and opens a new avenue for their solar-to-fuel conversions.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2023
·Vol. 25
·期 4
·1-11
·
IF 2.5
Fu Lili,Gao Yongjin,Zheng Ruilin,Feng Qidong,Chen Ming,Qin Tianjie,Liu Chunxiao,Wei Wei
The encapsulation of CsPbBr 3 nanocrystals (NCs) in oxide glass can effectively avoid contact of the external environment with the halide perovskite. However, the effects of hydroxyl and oxygen on NCs cannot be completely excluded because of the nature of oxide glass itself. Here, we proposed a new solution to solve these problems by using fluorophosphate (FP) glass as the embedding matrix. The composition (Br concentration) and heat treatment conditions (temperature and time) of the glass matrix were designed and optimized to improve the optical properties of CsPbBr 3 NCs. The results showed that highly pure green light with an emission peak of 534 nm and a full-width at half-maximum (FWHM) of approximately 19 nm was achieved using CsPbBr 3 NCs@glass and a light-emitting diode (LED)/laser diode (LD). The Commission Internationale de l'Eclairage (CIE) coordinates of the two devices were (0.243, 0.723) and (0.239, 0.739), with very high color purities of 96.6% and 97.3%, respectively. The photoluminescence quantum yields (PLQYs) of the samples excited at 365 nm and 450 nm wavelengths were 34.54% and 38.85%, respectively. Additionally, the chemical stability of CsPbBr 3 NCs was significantly improved by the encapsulation in FP glass, retaining 88% of the original PL intensity after 30 days of storage in deionized water. This work provides a new choice to improve the stability of a halide perovskite in a matrix.
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Fundamental Research
·
2022
·
IF 0
Weinan Xue,Xin Zhang,Wei Zhu,Xue Zhang,Wei Wang,Linwei Peng,Xiang Ma,Yan Li
Colloidal lead halide perovskite nanocrystals (LHP NCs) are promising semiconductor materials for optoelectronic devices, but the high ionicity of LHP NCs makes their crystallization control and post-treatment difficult. Here, phosphonic acids (PAs) are employed as ligands to design a solid-liquid heterogeneous reaction system to regulate the LHP NC crystallization and achieve the desired focusing growth. During the heterogeneous synthesis, the precursors in the liquid phase are responsible for the burst nucleation and initial growth of NCs. Afterwards, the focusing growth of NCs is supported by the precursors released from the solid phase. In addition, the strong binding ability of PAs enables effective passivation of LHP NCs. Without post-treatment, gram-scale monodisperse CsPbBr 3 NCs having photoluminescence with a full width at half-maximum of 18 nm and a quantum yield of near-unity are obtained. The CsPbBr 3 NCs covered by a compact ligand layer keep initial quantum yield even after 18 cycles of purification , exhibiting excellent stability against polar solvents , ultraviolet irradiation and heat treatment. As scintillators , the prepared CsPbBr 3 NCs show strong radioluminescence emission and high-resolution X-ray imaging.
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Advanced Materials Interfaces
·
2022
·Vol. 9
·期 16
·2102522
·
IF 6.389
Li-Jiao Ma,Hui-Qin Wu,Bi-Yu Chen,Gang Wang,Bing-Xin Lei,Ding Zhang,Dai-Bin Kuang
0D-2D p–n type CsPbBr 3 /BiOCl heterojunction photocatalyst is successfully fabricated via the electrostatic self-assembly process. On the basis of the photoluminescence and photocurrent density results, the CsPbBr 3 /BiOCl composite exhibits a higher charge separation rate than pure BiOCl and CsPbBr 3 . The degradation of Rhodamine B (RhB) result shows that the CsPbBr 3 /BiOCl composite obtains the highest degradation rate of close to 100% within 60 min, which is significantly higher than those of pure CsPbBr 3 (84.21%) and BiOCl (73.57%) because the p–n type heterojunction photocatalyst can promote the separation of photogenerated charge carriers. The free radical capture experiment demonstrates that •O 2 − plays a major role in the photodegradation of RhB. This study may provide insights into designing advanced photocatalysts for the clean-ups of environmental pollutants.
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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.
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CRYSTENGCOMM
·
2021
·Vol. 23
·期 16
·2938-2944
·
IF 3.545
Lijia Guo,Manying Liu,Yan Lei,Liwei Mi,Zhi Zheng
Inorganic perovskite CsPbBr3 is a suitable candidate owing to its excellent stability and outstanding visible light absorption. However, it is a huge challenge to fabricate single phase CsPbBr3 films. Herein, we developed an in situ metal reaction strategy to fabricate single phase CsPbBr3 films by reacting Pb precursors with CsBr/HBr in methanol solution. The thickness of the sputtered Pb film plays a key role in inhibiting the formation of a secondary CsPb2Br5 phase. The results indicate that the single phase CsPbBr3 films can be obtained by using below 40 nm of the sputtered Pb films, and the single phase CsPbBr3 device architecture exhibits 4.08% power conversion efficiency. This device can retain over 95% of the initial efficiency after 30 days of storage without packaging in an ambient environment.
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Nature Communications
·
2021
·Vol. 12
·期 1
·1-10
·
IF 14.919
Peng Jiali,Xia Chelsea Q.,Xu Yalun,Li Ruiming,Cui Lihao,Clegg Jack K.,Herz Laura M.,Johnston Michael B.,Lin Qianqian
Metal halide perovskites have fascinated the research community over the past decade, and demonstrated unprecedented success in optoelectronics. In particular, perovskite single crystals have emerged as promising candidates for ionization radiation detection, due to the excellent opto-electronic properties. However, most of the reported crystals are grown in organic solvents and require high temperature. In this work, we develop a low-temperature crystallization strategy to grow CsPbBr 3 perovskite single crystals in water. Then, we carefully investigate the structure and optoelectronic properties of the crystals obtained, and compare them with CsPbBr 3 crystals grown in dimethyl sulfoxide. Interestingly, the water grown crystals exhibit a distinct crystal habit, superior charge transport properties and better stability in air. We also fabricate X-ray detectors based on the CsPbBr 3 crystals, and systematically characterize their device performance. The crystals grown in water demonstrate great potential for X-ray imaging with enhanced performance metrics.
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高影响因子
Nano Research
·
2020
·Vol. 14
·期 5
·1397-1404
·
IF 8.183
Chen Tianyu,Huang Mengna,Ye Zhongju,Hua Jianhao,Lin Shen,Wei Lin,Xiao Lehui
Blinking fluorophore perovskite nanocrystals (NCs) were employed to image the fine structure of the polystyrene (PS) electrospun fibers. The conditions of CsPbBr 3 NCs embedded and dispersed into PS were investigated and optimized. The stochastic optical reconstruction microscopy is employed to visualize the fine structure of the resulted CsPbBr 3 @PS electrospun fibers at sub-diffraction limit. The determined resolution in the reconstructed nanoscopic image is around 25.5 nm, which is much narrower than that of conventional fluorescence image. The complex reticulation and multicompartment in bead sub-diffraction-limited structures of CsPbBr 3 @PS electrospun fibers were successfully mapped with the help of the stochastic blinking properties of CsPbBr 3 NCs. This work demonstrated the potential applications of CsPbBr 3 perovskite NCs in super-resolution fluorescence imaging to reconstruct the sub-diffraction-limited features of polymeric material.
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Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 48
·17403-17409
·
IF 7.059
Cuifang Meng,Dandan Yang,Ye Wu,Xuejia Zhang,Haibo Zeng,Xiaoming Li
Encapsulating cesium lead halide (CsPbX3, X = Cl, Br, and I) perovskite quantum dots (PQDs) into stable shells has been proved to be an effective strategy for improving their stability, which however usually forms agglomerated particles or alters PQDs’ original morphology and optical properties. Herein, we propose a surface activation strategy to prepare single CsPbBr3@SiO2 core–shell particles. (3-Aminopropyl)triethoxysilane (APTES) is used as a bifunctional surface ligand, which not only effectively passivates the surface defects of PQDs, but also provides –SiOCH3 and –SiOH groups for the formation of Si–O–Si covalent bonds with the subsequently introduced silanes. Furthermore, by controlling the hydrolysis rate of silanes, we realized the preparation of single CsPbBr3@SiO2 core–shell particles with an average shell thickness from 1 to 2.7 nm, and the PQDs maintained their initial cubic morphology and optical properties after coating. The stability of CsPbBr3@SiO2 in harsh environments has been effectively improved owing to the complete encapsulation of the SiO2 shell. As a result, the emission peak of CsPbBr3@SiO2 remains constant at 515 nm after being heated at 60 °C for 84 h, and the photoluminescence (PL) intensity still remains 90% after storage for 6 h in a high humidity environment. This work not only enhances the stability of PQDs for practical applications but also provides a reliable method to synthesize single core–shell particles, which can be instructive to other PQD systems.
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