JOURNAL OF LUMINESCENCE
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2023
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IF 3.6
Rongliang Deng,Xiaotong Fan,Guolong Chen,Changzhi Yu,Xiao Yang,Yue Lin,Hao-Chung Kuo,Tingzhu Wu,Zhong Chen
Rigid protection layers for the lead-halide perovskite effectively enhance its stability. In this work, for the most vulnerable CsPbI 3 perovskite nanocrystals (PNCs), we introduced zero-dimensional perovskites Cs 4 PbI 6 for protection in addition to already robust SiO 2 all-inorganic encapsulation, via high-temperature solid-state synthesis. It is proven that the CsPbI 3 –Cs 4 PbI 6 nano-composite not only maintains the emission peak location of CsPbI 3 PeNCs at 700 nm with remarkable oxygen and water resistances, but also exhibits enhanced instant and long-term thermal stability compared with samples containing less amount of Cs 4 PbI 6 . The passivation of defects on the interface of CsPbI 3 –Cs 4 PbI 6 contributes to the enhancement of photoluminescence quantum yield by 8%. These ultra stable CsPbI 3 –Cs 4 PbI 6 nano-composites show potentials in the application of luminous and display industries.
研究领域:
材料科学
·
光电子学
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产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2024
·
IF 2.8
Fo Bai,Zhengtong Wang,Xiaohui Liu,Junhuan Zhao,Zhongjie Zhai,Chun Sun
In this study, we employed a modified ligand-assisted recrystallization precipitation (LARP) method to synthesize perovskite nanomaterials with emission peaks ranging from 515 nm to 683 nm. The synthesis of these nanomaterials with different emission peaks was achieved by simply controlling the type and amount of cesium oleate. These CsPbI 3 nanomaterials possess different morphologies, and all of them show excellent PL properties. Furthermore, by simply mixing the nanomaterials with sodium citrate, a large quantity of powders of various colors was obtained, which can be used for the fabrication of multicolor patterns.
研究领域:
材料科学
·
化学
✓ 已验证
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DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Dan Li,Chang-Song Chen,Yi-Hua Wu,Zhi-Gang Zhu,Wan Y. Shih,Wei-Heng Shih
Cesium lead halide perovskite nanocrystals have a narrow emission peak tunable in the visible wavelength range with a high quantum yield. They hold great potential for optoelectronic applications such as light-emitting diodes or electronic displays. However, cesium lead iodide (CsPbI3) is not stable under ambient conditions, limiting its applications. Here, we use a solution surface treatment approach to improve the photostability of CsPbI3 suspensions in toluene. When a CsPbBr3 precursor is used via the method of heterogeneous surface treatment, the photoluminescence (PL) intensity is enhanced but the PL only lasts 2 days. In contrast, when a CsPbI3 precursor is used via the method of homogeneous surface treatment, not only the PL intensity of CsPbI3 suspensions is enhanced but also the stability with the PL lasts for 11 days. It is likely that a better protection on the core CsPbI3 by itself can be achieved because of better matching of the material structure and surface chemistry.
研究领域:
材料科学
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光学工程
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产品关联
DOI
PubMed
高影响因子
Small
·
2025
·Vol. 21
·期 8
·2408422
·
IF 12.1
Aleksandr P. Litvin,Jie Guo,Jianxun Wang,Xiaoyu Zhang,Weitao Zheng,Andrey L. Rogach
Metal halide perovskite nanoplatelets (NPls) possess ultra-narrow photoluminescence (PL) bands tunable over the entire visible spectral range, which makes them promising for utilization in light-emitting diodes (LEDs) with spectrally pure emission colors. This calls for development of synthetic methods toward perovskite NPls with a high degree of control over both their thickness and lateral dimensions. A general strategy is developed to obtain such monodisperse CsPbI 3 NPls through the control over the halide-to-lead ratio during heating-up reaction. The excess of iodine precursor changes the chemical equilibrium, thus yielding monodisperse (3 monolayers in thickness) CsPbI 3 NPls whose PL width constitutes ≈22 nm, while the lateral dimensions of NPls are determined by choice of precursor and by the reaction temperature. Postsynthetic cation exchange on the A-site of the perovskite lattice allows for the tuning of the PL peak position, while simultaneous removal of the excess ligands and the surface passivation allows for improvement of the PL quantum yield to 96% and ensures superior stability of optical properties upon storage. Electroluminescent LEDs with the peak values are fabricated for the external quantum efficiency and luminance being 9.45% and 29800 cd m −2 , respectively, and a narrow (≈26 nm) electroluminescence peak at 601 nm.
研究领域:
材料科学
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光电工程
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化学合成
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Yaqian Zhang,Jianming Liu,Huiling Zhang,Qingyun He,Xiaojuan Liang,Weidong Xiang
In this work, a series of perovskite nanocrystals glasses with different concentrations of Tb 3+ doped CsPbI 3 , which have excellent characteristics in terms of water resistance and cyclic thermal stability, were prepared by melt quenching and in situ crystallization methods. With the introduction of Tb 3+ , the photoluminescence quantum yield of CsPbI 3 was greatly improved. Considering that the two fluorescence peaks of Tb 3+ and CsPbI 3 at different positions respond differently to temperature stimuli, we studied the potential application of those glasses as optical temperature detection tools in the temperature range of 80−480 K. More importantly, the results showed higher sensitivity than other tools, with the maximum absolute and relative temperature sensitivities reaching as high as 0.034 K −1 and 1.78 % K -1 , respectively. This work is expected to provide an effective method for the application of CsPbX 3 in high-performance optical temperature sensing materials.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Small
·
2020
·Vol. 16
·期 50
·2005246
·
IF 11.459
Qiufeng Ye,Fei Ma,Yang Zhao,Shiqi Yu,Zema Chu,Pingqi Gao,Xingwang Zhang,Jingbi You
Cesium lead iodide (CsPbI 3 ) perovskite has gained great attention due to its potential thermal stability and appropriate bandgap ( ≈ 1.73 eV) for tandem cells. However, the moisture-induced thermodynamically unstable phase and large open-circuit voltage ( V OC ) deficit and also the low efficiency seriously limit its further development. Herein, long chain phenylethylammonium (PEA) is utilized into CsPbI 3 perovskite to stabilize the orthorhombic black perovskite phase (γ-CsPbI 3 ) under ambient condition. Furthermore, the moderate lead acetate (Pb(OAc) 2 ) is controlled to combine with phenylethylammonium iodide to form the 2D perovskite, which can dramatically suppress the charge recombination in CsPbI 3 . Unprecedentedly, the resulted CsPbI 3 solar cells achieve a 17% power conversion efficiency with a record V OC of 1.33 V, the V OC deficit is only 0.38 V, which is close to those in organic-inorganic perovskite solar cells (PSCs). Meanwhile, the PEA modified device maintains 94% of its initial efficiency after exceeding 2000 h of storage in the low-humidity controlled environment without encapsulation.
研究领域:
材料科学
·
光伏技术
·
能源研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2024
·Vol. 16
·期 29
·14108-14115
·
IF 5.8
Jiaying Zheng,Jiwei Ma,Minghuai Yu,Hao Xie,Dongdong Yan,Yihong Dong,Yi Liu,Xiaoyu Wang,Weixiang Ye
Inorganic CsPbI3 perovskite nanocrystals (NCs) exhibit remarkable optoelectronic properties for illumination. However, their poor stability has hindered the development of light-emitting diodes (LEDs) based on these materials. In this study, we propose a facile method to synthesize Mg2+-doped CsPbI3 NCs with enhanced stability and high photoluminescence (PL) intensity under ambient air conditions. Theoretical calculations confirm that doped NCs possess stronger formation energy compared to undoped NCs. The undoped CsPbI3 NCs emit red light at approximately 653 nm. We optimize the doping ratio to 1/30, which significantly enhances the photoluminescence of single-particle CsPbI3 NCs. Subsequently, we fabricate a red LED by combining the CsPbI3 NCs with a blue chip. The resulting LED, based on the doped CsPbI3 NCs, exhibits excellent performance with a high luminance of 4902.22 cd m−2 and stable color coordinates of (0.7, 0.27). This work not only presents a simple process for synthesizing perovskite NCs but also provides a design strategy for developing novel red LEDs for various applications.
研究领域:
材料科学
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光电技术
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Discover Nano
·
2023
·Vol. 18
·期 1
·1-12
·
IF 0
Zhou Houpu,Chen Mengwei,Liu Chenguang,Zhang Rui,Li Jing,Liao Sainan,Lu Haifei,Yang Yingping
Photodetectors (PDs) suffer from dark current due to defects in the perovskite photosensitive layer. Contact between the photosensitive layer and carbon electrodes could result in recombination of carriers at the interface. In this work, CsPbI 3 quantum dots (QDs) were added between the photosensitive layer and the carbon electrode as the interfacial layer to passivate the surface defects of perovskite layer and improve the energy level matching at the interface. The effect of QDs concentrations on the passivation of the perovskite layer was investigated. It was found that the photoluminescence intensity of perovskite films was the strongest and the decay lifetime was the longest when the QDs concentration was 3 mg/mL. Owing to QDs passivation, the dark current of perovskite PD decreased by 94% from \(2.04\; \times \;10^{ - 9}\) to \(1.17\; \times \;10^{ - 10}\) A. The responsivity ( R ) at 605 nm improved by 27% from 0.29 to 0.37 A/W at 0 V bias voltage. The specific detectivity ( D* ) increased by 420% from \(8.9\; \times \;10^{11}\) to \(4.7\; \times \;10^{12}\) Jones.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Muhammad Sohail,Zulfiqar Ali,M. Sohail,Areej S. Alqarni,Intikhab Alam,Nimra Razzaq,Fazl ullah,Qiuyun Ouyang
Halide perovskites, particularly cesium lead iodide (CsPbI3), have garnered significant attention due to their remarkable properties, including strong absorbance across the visible to near-infrared spectrum and a unique electronic structure that enhances their nonlinear optical (NLO) and optoelectronic applications. In this study, CsPbI3 was synthesized using a hot injection technique and incorporated into a methyl methacrylate (MMA) matrix through polymerization to form CsPbI3/PMMA organic glasses. The NLO properties of these glasses were characterized using the Z-scan technique with a nanosecond pulse laser at an excitation wavelength of 532 nm. Notably, the CsPbI3/PMMA organic glasses exhibited a transition from saturable absorption (SA) to reverse saturable absorption (RSA) upon adjusting the input energy. Furthermore, by integrating a fiber ferrule coating-based CsPbI3 saturable absorber (SA) into the laser cavity, we successfully realized a passively Q-switching (PQS) laser with a minimum pulse duration of 4.7 μs and a signal-to-noise ratio (SNR) of 50 dB at 1.55 μm, respectively. Consequently, the experimental findings indicate that CsPbI3NP-based saturable absorbers (SAs) exhibit performance characteristics that are either comparable to or surpass those of conventional nanoparticle-based SAs. This observation underscores the significant potential of CsPbI3-based SAs for applications in pulsed laser sources, suggesting their viability as advanced materials for enhancing laser performance and stability.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Rui Wang,Chenyu Shang,Qiqi Zhao,Qi Huang,Chenyang Liu,Wenli Xu,Rui Liu,Weiwei Zhang,Jianxu Ding
Cubic α-CsPbI3 is recognized as one of the most promising semiconductors for optoelectronic applications owing to its suitable band gap, excellent optoelectronic performance, and thermal stability. However, its phase instability from α to δ poses a significant obstacle for practical applications. How to stabilize α-CsPbI3 becomes a paramount issue. Here, we propose a strategy in which α-CsPbI3 nanocrystals (NCs) are in situ generated in the Cs4PbI6 single-crystal (SC) matrix through I ion migration, facilitated by its ultralow activation energy (0.104 eV). The existence of the I vacancy can promote ion migration and can increase the content of α-CsPbI3. As α-CsPbI3 NCs are generated in situ, the light yellow Cs4PbI6 SCs convert to black. The lattice of Cs4PbI6 twines outside of α-CsPbI3 NCs without a grain boundary and restricts the migration of I and Cs within the α-CsPbI3 lattice. This mechanism effectively stabilizes α-CsPbI3 for over 2 years without experiencing a phase transition. Such stable α-CsPbI3 NCs exhibit deep red emission (700 nm), a high exciton binding energy (55.5 meV), and a long carrier lifetime (176.9 ns). Furthermore, annealing at 320 °C for 12 h did not result in any damage. Additionally, white-light-emitting diodes (WLEDs) were fabricated using black Cs4PbI6 SCs and yellow phosphor YAG:Ce3+ under an atmospheric environment and realized white emission. The WLEDs maintain approximately 86% luminescence after 18 days or under continuous operation for 12 h, demonstrating high stability and eliminating the need for short-wavelength blue chips. Overall, the α-CsPbI3 NCs deviating from Cs4PbI6 SCs offer an approach to realize highly efficient light-emitting diode applications.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Hengzhuo Cai,Shengcheng Wu,Zixi Liu,Junfeng Lin,Xubing Lu,Xingsen Gao,Jun-Ming Liu,Sujuan Wu
All-inorganic CsPbI x Br 3-x perovskite solar cells (PSCs) exhibit excellent thermal stability and high efficiency, but their power conversion efficiency (PCE) remains lower than that of organic–inorganic hybrid PSCs. This is primarily due to the significant open-circuit voltage (V oc ) loss at the buried interface of electron transport layer (ETL) and perovskite film. Moreover, low-temperature processed TiO 2 ETL simultaneously suffers from more trap-states which will deteriorate the PCE and stability of PSCs. To solve these issues, zinc acetate (Zn(OAc) 2 ) is employed to optimize the TiO 2 /CsPbI 2 Br buried interface to reduce the V oc loss and improve the PCE and device stability. This Zn(OAc) 2 interfacial modification0020increases the V oc about 90 m V from 1.159 V to 1.248 V. Consequently, Zn(OAc) 2 -modified CsPbI 2 Br PSCs (Target I-PSCs) achieve a champion PCE of 14.91 % with a fill factor over than 80 %, which is significantly higher than the 12.25 % of reference I-PSCs. A series characterizations confirm that the improved performance is attributed to the increased electrical conductivity of the modified TiO 2 film, the passivated defects on the TiO 2 surface and the uncoordinated Cs + /Pb 2+ traps at the bottom of CsPbI 2 Br film, as well as the optimized the energy level alignment to facilitate electron transport and collection. This work provides a feasible strategy to fabricate efficient and stable CsPbI 2 Br I-PSCs by modifying the TiO 2 /CsPbI 2 Br buried interface by Zn(OAc) 2 .
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Chun Sun,Zhengtong Wang,Fuhao Zhang,Anni Chen,Zhihui Deng,Kai Lian,Yiwei Zhao,Jiachen Han,Yelin Ding,Mingming Luo
The development of pure red-emitting CsPbI 3 quantum dots (QDs) has been hindered by challenges including long-term instability, low yield and photoluminescence quantum yields (PLQYs), and self-absorption issues in solid-state applications. Herein, sodium citrate (SC) passivated CsPbI 3 QDs are prepared by using a simple post-treatment method, which is also applicable to other CsPbX 3 QDs. Due to the chelating coordination role of citrate, the PLQY of red SC-CsPbI 3 can reach 96 %. In addition to its passivating role, SC also acts as a matrix to increase inter-particle distances, reducing self-absorption and acquiring high PL intensity. Furthermore, SC treatment can also increase the yield of smaller QDs, which are typically challenging to isolate using conventional centrifugation methods. The passivation afforded by SC results in enhanced thermal and air stability in the samples. We utilized this narrow-band red phosphor to fabricate white light-emitting diodes (WLEDs) for lighting and display applications. Upon incorporating the red phosphor into the commercial WLED, there is a notable enhancement in the color rendering index (CRI), signifying its substantial impact on lighting WLED. For display application, the perovskite-based WLED achieves a color gamut coverage reaching up to 120 % of the National Television System Committee (NTSC) standard. This remarkable performance also underscores its significant potential for applications in display area.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）