NANO LETTERS
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2021
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IF 11.189
Chen Li,Shuai Zhou,Jing Nie,Jie Huang,Xiaoping Ouyang,Qiang Xu
Because of the extraordinary properties including high atomic numbers and large μτ products, metal halide perovskites have been widely employed and used for radiation detecting. Cs4PbI6 material has a high X-ray attenuation coefficient and excellent electrical properties that have a good potential in X-ray detection applications. Here, we have designed a flexible polymer-encapsulated Au/Cs4PbI6/Au X-ray detector with outstanding sensitivity of 256.20 μC Gy–1 cm–2 irradiated by 30 keV X-ray at 10 V bias, long-time stability, and durable flexibility without obvious degradation after bending for 600 cycles. These features demonstrate that this polymer-encapsulated durable flexible and sensitive X-ray detector could open a new possibility for next-generation radiation applications in dosimeter, imaging technologies.
研究领域:
材料科学
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医学影像
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辐射探测技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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
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光电子学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry Letters
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2020
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IF 6.71
Qiang Xu,Chen Li,Jing Nie,Yong Guo,Xiang Wang,Bohao Zhang,Xiaoping Ouyang
Lead halide perovskite single crystals with a high X-ray stopping power and large μτ product have been successfully used for X-ray detection. However, poor air stability and ionic migration lead to the degradation of the devices for long-term operations. Here, we report a solution-processed lead 0D bulk Cs4PbI6 single crystal, which have I atoms in isolated [PbI6]4–. This 0D Cs4PbI6 single crystal has a μτ product of 9.7 × 10–4 cm2 V–1 and an activation energy of 321.28 meV. We have fabricated a photoconductor device with a symmetric Au/Cs4PbI6/Au sandwich structure, which exhibits a high sensitivity of 451.49 μC Gy–1 cm–2 under 30 keV X-ray irradiation at an applied voltage of 30 V. After storing the device in air at room temperature for three months, the device retains nearly the same sensitivity as the original. These results demonstrate that this 0D Cs4PbI6 perovskite single crystal has great potential for practical X-ray detection applications.
研究领域:
材料科学
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应用物理
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核探测
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光电子学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2019
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IF 5.155
Chunyu Sun,Xinzhan Wang,Yanmei Xu,Wanbing Lu,Xiaoyun Teng,Guangsheng Fu,Wei Yu
CsPbI 3 nanocrystals (NCs) with photoluminescence quantum yield (PLQY) larger than 90% have been synthesized at different temperature regions, and the physical origins for high PLQY were investigated. HRTEM images show that cubic phase CsPbI 3 (α-CsPbI 3 ) is surrounded by hexagonal Cs 4 PbI 6 in the low temperature region, and the ratio of CsPbI 3 and Cs 4 PbI 6 increases with increasing the reaction temperature. The strong confinement effect of Cs 4 PbI 6 leads to the high PLQY (95%) of α-CsPbI 3 NCs when the reaction temperature is 120 °C. The confinement effect of Cs 4 PbI 6 is weakened with increasing reaction temperature, which leads to the decrease of PLQY at 140 °C. However, non-radiative recombination is suppressed due to the microstructure improvement with further increasing the reaction temperature, and PLQY as high as 97% is achieved at 180 °C. Stability testing shows that fast degradation of α-CsPbI 3 NCs occur in low reaction temperature region, and α-CsPbI 3 NCs with high PLQY can be stored in air for 90 days when the reaction temperature is 180 °C.
研究领域:
材料科学
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
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2024
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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
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光电技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
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2026
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IF 4.9
Zhangwei Guo,Zhuolu Li,Yi Wu,Song Wang,Jiaxin Rui,Zhaogang Teng,Lihong Qi,Kai Pan
One-dimensional (1D) CsPbI 3 nanomaterials with long carrier lifetimes, high carrier transport efficiencies, and anisotropic optical properties show promising applications in lasers and photodetectors. In this study, monodisperse Cs 4 PbI 6 nanocrystals (NCs) (12.3 nm) were first synthesized by thermal injection. The addition of deionized water to this solution then induced the conversion of Cs 4 PbI 6 NCs into CsPbI 3 NCs, followed by their self-assembly into CsPbI 3 nanorods (NRs) with controllable aspect ratios. This process leverages the high solubility of CsI in water, which drives the decomposition of Cs 4 PbI 6 and the formation of CsPbI 3 NCs, which subsequently self-assembled and fused into CsPbI 3 NRs. CsPbI 3 NRs synthesized under the optimal reaction conditions were characterized by uniform size and regular morphology, with a diameter of 12.4 nm and length of 52.5 nm. XRD analysis shows that these monodisperse CsPbI 3 NRs, in contrast to 1D CsPbI 3 nanomaterials synthesized by the conventional thermal injection method, possess a typical cubic phase (α-phase) structure and exhibit good red light emission properties. Due to kinetic limitations during rapid nucleation at the nanoscale, the system preferentially forms the metastable α-CsPbI 3 , characterized by a low nucleation barrier and strong structural inheritance, rather than the thermodynamically stable δ-phase. Compared with NRs obtained under other reaction conditions, the optimal CsPbI 3 NRs demonstrate stronger fluorescence intensity and longer fluorescence lifetime. The CsPbI 3 NRs synthesized under the optimal conditions (2 mL water, 5 min) exhibit a strong first exciton absorption peak at 450 nm, a narrow photoluminescence emission peak at 695 nm, a lifetime as high as 239.9 ns, and a higher exciton binding energy (72.5 meV), ensuring efficient exciton emission at room temperature. Compared with NRs obtained under other reaction conditions, these optimally synthesized NRs demonstrate stronger fluorescence intensity and longer fluorescence lifetime. This work presents a reliable method for the controlled synthesis of 1D α-CsPbI 3 NRs, offering a theoretical and experimental foundation for the application of halide perovskite nanorods in high-performance optoelectronic devices.
✓ 已验证
DOI
高影响因子
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