Nanoscale
·
2020
·Vol. 12
·期 16
·9231-9239
·
IF 6.895
Xiaolin Xiao,Ye Li,Rong-Jun Xie
Low dimensional semiconductor nanomaterials show great promise for a variety of applications due to their size-dependent and excellent optoelectronic properties. In this work, we developed a strategy to synthesize uniform and very thin CsPbBr3 perovskite nanoplates (NPls) by introducing additional metal bromides. The CsPbBr3 NPls, self-assembled into a face-to-face stacked state, had a thickness of 4.4 nm (equal to only 2 monolayers, 2 MLs) and showed a maximum emission at 437 nm and a narrow FWHM of 14 nm. The formation mechanism of the CsPbBr3 NPls by adding FeBr3 was ascribed to the constrained growth of CsPbBr3 nanocubes when the surface Cs+ ions were substituted by the protonated oleylammonium from the byproduct OLA-HBr.
研究领域:
材料科学
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纳米技术
·
光电子学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 15
·5370-5376
·
IF 5.7
Zhanpeng Wang,Luyang Hou,Jingzhou Li,Jiahao Zhang,Hongyu Yang,Yichi Zhong,Hongxing Dong,Long Zhang
CsPbBr3 nanoplates with excellent optical properties are emerging as a kind of novel functional material and are applied in many fields. In this work, we synthesize high-efficiency CsPbBr3 nanoplates with extreme blue emission and near 100% photoluminescence quantum yield. The unique optical properties and stable structure result from the sufficient surface passivation due to the addition of ZnBr2, which endows it with great prospects in the field of blue light optical wireless communication. CsPbBr3 nanoplates show 32 MHz bandwidth with no dependence on excitation power, excitation light incidence angle and solution concentration. Furthermore, the optical wireless communication system is built based on CsPbBr3 nanoplates and up to 150 Mbps signal transmission rate is achieved, which demonstrates its bright application potential.
研究领域:
材料科学
·
光学工程
·
通信技术
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Huiyuan Bai,Zhibin Huang,Yuhang Xu,Yijie Wang,Lei Zhang
All-inorganic blue-emissive CsPbBr3 perovskite nanoplatelets (NPLs) are promising for optoelectronic applications due to excellent optical properties, but their applicability is seriously restricted by a low photoluminescence efficiency and poor stability. Here, we develop a postsynthetic surface-mediated engineering strategy to prepare high-quality blue CsPbBr3 NPLs at room temperature by using strongly bound polystyrene sulfonic acid (PSS). PSS efficiently passivates the surface trap sites of NPLs via strong coordination bonds, thereby achieving high-efficiency exciton recombination and enhancing photostability. The optimized PSS-NPLs reveal intense blue emission with a central wavelength of ∼466 nm and a high photoluminescence quantum yield of ∼83.2%, indicating a substantial improvement from ∼48.3% of pristine NPLs. Simultaneously, the PSS-treated NPLs exhibit significantly enhanced stability in comparison with pristine NPLs during UV exposure and thermal treatment. Finally, we achieve efficient blue NPL-LEDs (peaked at ∼468 nm) using a PSS-NPL-polymer composite film, corresponding to CIE color coordinates of (0.124, 0.067), which closely approach to the Rec. 2020 blue standard. Hence, our work offers a facile strategy for fabricating high-performance perovskite NPLs and promotes their potential applications in blue-emitting optoelectronic devices.
研究领域:
材料科学
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光学工程
·
电子器件
✓ 已验证
产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2024
·Vol. 50
·期 7
·3473-3485
·
IF 2.8
Song Qianqian,Ou Xu,Lin Fei,Zhang Xue,Ye Siyuan,Li Yan
CsPbBr 3 nanoplatelets (NPLs) have gained significant attention as promising blue-emitting materials due to their large exciton binding energy and narrow full width at half-maximum (FWHM) of emission spectra. However, the weak binding ability of ligands to the surface of pure blue-emitting CsPbBr 3 NPLs results in reduced optical properties and stability. Here, a ligand passivation strategy was developed for synthesizing monodisperse pure blue-emitting CsPbBr 3 NPLs with enhanced photoluminescence (PL) by incorporating phenylalanine (PHE) ligands during NPLs growth. Due to the simultaneous interaction of the amino and carboxyl groups of PHE with the lead halide octahedron formed, the growth of CsPbBr 3 NPLs in the vertical direction is inhibited, while the surface defects of the NPLs prepared are effectively passivated. As a result, combined with the post-treatment with oleamine bromide (OAmBr), the synthesized monodisperse CsPbBr 3 NPLs show an emission peak centered at 461 nm with a narrow FWHM of 16 nm and a PLQY value of 98%.
研究领域:
材料科学
·
纳米技术
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Zhen-Dong Lian,Bo Wang,Zhi-Sheng Wu,Hao Lin,Ting Ding,Jin-Xiao Wang,Liang-Xing Zhang,Jin-Cheng Xu,Peng Xiao,Hua Xu,Shuang-Peng Wang,Kar Wei Ng
CsPbBr 3 nanoplates (NPs) have shown great potential in diverse optoelectronic applications. Despite the wonderful luminescence properties, the inherent instability of these NPs hinders their use in practical situations. Herein, a facile water-assisted strategy is reported to synthesize highly stable blue emission CsPbBr 3 NPs encapsulated in PbBr(OH). The introduction of water directly into the reaction mixture is pivotal, as it triggers the transformation of bulk CsPbBr 3 nanocubes into 2-D CsPbBr 3 NPs within the PbBr(OH) matrix, resulting in the formation of CsPbBr 3 @PbBr(OH) microbricks. Remarkably, the water content in the reaction mixture allows the control of the number of perovskite layers in the NPs, thus enabling the emission color to be tuned from deep blue to green. The unconventional approach presented herein not only offers a cost-effective pathway to synthesize blue-emitting perovskites which are highly stable in a wide variety of polar and non-polar solvents, but also holds immense potential for propelling the advancement of high-performance LEDs and other optoelectronic devices. The findings underscore the significance of water in dictating the growth dynamics and emission characteristics of perovskite NPs, paving the way for their practical application.
研究领域:
材料科学
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纳米技术
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Chun-Yan Wu,Yu-Xuan Le,Li-Yan Liang,Jing-Yue Li,Feng-Xia Liang,Shi-Rong Chen,Xiao-Ping Yang,Yu-Xue Zhou,Lin-Bao Luo
In this study, we report the fabrication of a sensitive deep ultraviolet (DUV) photodetector by using CsPbBr 3 nanosheets synthesized through confined-space growth at room temperature. The peak photoresponse of the device upon illumination blueshifts with decreasing thickness and a 68 nm CsPbBr 3 nanosheet based device displays a peak response to 265 nm illumination, showing responsivity and specific detectivity of 85 mA/W and 4.05 × 10 11 Jones at 3 V bias, respectively. Theoretical simulation reveals that the blueshift is associated with the wavelength-dependent absorption coefficient of CsPbBr 3 nanosheet: incident light with shorter wavelengths can be absorbed on the superficial surface, while long-wavelength light has a larger penetration depth, leading to dominant DUV absorption in thinner CsPbBr 3 nanosheet. This work will shed light on the facile and cost-effective fabrication of DUV photodetectors from non-ultrawide bandgap (UWBG) all-inorganic perovskite materials.
研究领域:
材料科学
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光子学
·
纳米技术
·
半导体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xue Zhang,Yanyu Cui,Siyuan Ye,Zhuohan Lin,Yan Li
Two-dimensional (2D) CsPbBr 3 nanoplatelets (NPLs) have attracted great attention as one of promising semiconductor nanomaterials due to their large exciton binding energy and narrow emission spectra. However, the labile ionic and weakly bound surfaces of deep-blue emitting CsPbBr 3 NPLs with wide bandgap result in their colloidal instability, thus degrading their optical properties. It is challenging to obtain deep-blue emitting CsPbBr 3 NPLs with excellent optical properties. In this study, high-quality blue-emitting CsPbBr 3 NPLs with tunable thickness were prepared adopting the DBSA-mediated confinement effect based on the hot-injection method. Thanks to the coordination interaction of − SO 3 − of DBSA ligand and the Pb 2+ on the surface of the CsPbBr 3 NPLs, as well as the effective passivation of Br vacancy defects on the surface of NPLs by OAm-Br, the obtained pure-blue CsPbBr 3 NPLs and deep-blue CsPbBr 3 NPLs show high photoluminescence quantum yield (PLQY) of 92 % and 81.2 %, respectively. To the best of our knowledge, this is the highest PLQY recorded for deep-blue emitting CsPbBr 3 NPLs with two monolayers [PbBr 6 ] 4− octahedra. Furthermore, the agglomeration of CsPbBr 3 NPLs due to ligand loss induced by moisture, oxygen, and irradiation was also suppressed by the dual passivation effect of DBSA and OAm-Br. Our work provided a new approach to developing high-performance and stable deep-blue emitting CsPbBr 3 perovskite nanoplatelets.
研究领域:
材料科学
·
纳米技术
·
光电学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Hao Wang,Zhentao Du,Xue Jiang,Sheng Cao,Bingsuo Zou,Jinju Zheng,Jialong Zhao
Recently, photodetectors based on perovskite nanoplatelets (NPLs) have attracted considerable attention in the visible spectral region owing to their large absorption cross-section, high exciton binding energy, excellent charge transfer properties, and appropriate flexibility. However, their stability and performance are still challenging for perovskite NPL photodetectors. Here, a surface engineering strategy to enhance the optical stability of blue-light CsPbBr3 NPLs by acetylenedicarboxylic acid (ATDA) treatment has been developed. ATDA has strong binding capacity and a short chain length, which can effectively passivate defects and significantly improve the photoluminescence quantum efficiency, stability, and carrier mobility of NPLs. As a result, ATDA-treated CsPbBr3 NPLs exhibit improved optical properties in both solutions and films. The NPL solution maintains high PL performance even after being heated at 80 °C for 2 h, and the NPL film remains nondegradable after 4 h of exposure to ultraviolet irradiation. Especially, photodetectors based on the treated CsPbBr3 NPL films demonstrate exceptional performance, especially when the detectivity approaches up to 9.36 × 1012 Jones, which can be comparable to the best CsPbBr3 NPL photodetectors ever reported. More importantly, the assembled devices demonstrated high stability (stored in an air environment for more than 30 days), significantly exceeding that of untreated NPLs.
研究领域:
材料科学
·
光电子学
·
光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2024
·
IF 10.7
Xiao Yang,Liangyi Zhao,Siyi Yang,Miao Tang,Huanbao Fa,Danqun Huo,Changjun Hou,Mei Yang
The detection of circulating tumor DNA (ctDNA), as a practical liquid biopsy technique, was of great significance for the study of cancer diagnosis and prognosis. However, reported methods for detection ctDNA still have some limitations, such as tedious process and high cost. In this study, CsPbBr 3 nanosheet (CsPbBr 3 NS) with high water stability was prepared by etching, and its fluorescence intensity could be stably stored for 1 year. The Ti 3 C 2 T x possessed high quenching efficiency for CsPbBr 3 NS and the HOMO-LUMO orbital study revealed that the PET mechanism was responsible for fluorescence quenching. And the Ti 3 C 2 T x showed stronger affinity towards single-stranded DNA (ssDNA), as compared with double-stranded DNA (dsDNA). The probe ssDNA could be adsorbed on the surface of Ti 3 C 2 T x through π-π stacking. After the targets were recognized by probe ssDNA to form dsDNA, its affinity with Ti 3 C 2 T x decreased and the active site of Ti 3 C 2 T x recovered, causing a high quenching efficiency on CsPbBr 3 NS. Based on this, a label-free fluorescent biosensor was designed for the sensitive detection of ctDNA ( EGFR 19 Dels for non-small cell lung cancer, NSCLC). Under the optimal experimental conditions, this biosensor exhibited a detection limit of 180 fM and a linear range of 50 pM–350 pM with amplification of magnetic beads through strand displacement reaction. In addition, this sensor was applied to the detection of ctDNA in serum samples and cells lysates. This method for ctDNA detection was expected to have great potential for biomarker detection in the field of liquid biopsy.
研究领域:
癌症诊断
·
纳米技术
·
生物传感器
·
分子生物学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）