ACS Omega
·
2020
·
IF 2.87
Yantong Lu,Guangshe Li,Sixian Fu,Shaofan Fang,Liping Li
CsCu2I3 mixed with Cs3Cu2I5 has shown potential applications as white-light-emitting materials, while their growth, structural evolution behaviors, and their impact on photoluminescence of CsCu2I3 nanocrystals (NCs) are still not known. In this work, we investigated the growth and structural evolution of CsCu2I3 nanocrystals with increasing reaction temperature. At low temperature and in the presence of a high dosage of oleic acid and oleylamine, Cs3Cu2I5 nanoparticles, rather than CsCu2I3 NCs, preferred to form in the hot-injection reaction system. Increasing the reaction temperature promoted the formation of CsCu2I3 nanorods. Phase-pure CsCu2I3 nanorods were steadily obtained at 180 °C. Structural evolution from less copper-containing NCs to copper-rich ones in the low-temperature reaction condition is highly related to the coordination of copper ions with OAm. More importantly, accompanying the growth of nanorods and structural evolution from Cu3Cs2I5 to CsCu2I3, the color of photoluminescence emission of NCs changed from blue to nearly white and to yellow, but their photoluminescence quantum yield decreased from 36.00 to 9.86%. The finding in this work would give a view to the structural evolution of copper-containing perovskite-like halides, being helpful for adjusting their photoluminescence in white LEDs.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Shuang Yang,Zhenyu Tang,Bo Qu,Lixin Xiao,Zhijian Chen
Copper (Cu)-based perovskites are promising for lead-free perovskite light-emitting diodes (PeLEDs). However, it remains a significant challenge to achieve high performance devices due to the nonradiative loss caused by the disordered crystallization and lack of passivation. Crown ethers are known to form host–guest complexes by the interaction between C–O–C groups and certain cations, and 18-crown-6 (18C6) with an appropriate complementary size can interact with Cs+ and Cu+ cations. Herein, we studied the interaction between CsCu2I3 and two crowns with the same cyclic size, 18C6 and dibenzo-18-crown-6 (D18C6). Particularly, D18C6 can reduce the nonradiative recombination rate of CsCu2I3 film by passivating the defects and optimizing the film morphology effectively. The room mean square (RMS) decreased from 5.06 to 2.95 nm, and the PLQY was promoted from 4.71% to 19.9%. Besides, D18C6 can also decrease the barrier of hole injection. The PeLEDs based on D18C6-modified CsCu2I3 realized noticeable improvement with a maximum luminance and EQE of 583 cd/m2 and 0.662%, respectively.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Jianming Lai,Lujia Yang,Wenzhen Wang,Shaohan Wang,Yingshen Lu,Feng Hong,Fei Xu,Junfeng Chen,Yan Zhu,Hui Zhang,Run Xu,Linjun Wang
One-dimensional (1D) CsCu2I3 single crystals (SCs) have been investigated as novel sensitive X-ray and γ-ray scintillators, which can be prepared by the Bridgman method and solution method. However, to date, no research team has studied the scintillation performance of CsCu2I3 single crystals grown using the solution method, and traditionally grown single crystals using the antisolvent method are of poor quality and small sizes. In this work, high-quality CsCu2I3 SC was synthesized with formic acid as an additive by using the inverse temperature crystallization solution method, and its optical properties and scintillation performance were measured. The experimental results indicate that the addition of formic acid can stabilize the growth of crystals in solution, and the selected solvent DMF is beneficial for the growth of rod-like single crystals instead of needle-like single crystals by the DMSO. The experiment resulted in high-quality CsCu2I3 single crystals reaching a length of 13 mm, with no visible inclusions in the crystal. The full width at half-maximum (fwhm) of the X-ray rocking curve was 0.028°, indicating its high crystalline quality. It exhibits stability in air and emits bright yellow light under ultraviolet irradiation. The CsCu2I3 SC shows a much shorter PL decay of 118 ns and afterglow of 0.01% @ 12 ms compared to commercial CsI: Tl single crystal. The light yield of CsCu2I3 SC is 21800 photons/MeV, showing great potential as a scintillation material.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Shan-Shan Yan,You-Chao Kong,Zhi-Hong Zhang,Zhi-Sheng Wu,Zhen-Dong Lian,Yun-Peng Zhao,Shi-Chen Su,Lin Li,Shuang-Peng Wang,Kar Wei Ng
Lead-free perovskite has attracted great attention in realizing high-performance optoelectronic devices due to their excellent atmospheric stability and nontoxic characteristics. Although a pronounced ion migration effect has been observed in this new class of materials, its potential in enhancing the overall device performance is yet to be fully explored. In this work, we studied the effect of ion migrations on the carrier transport behavior and found that the recoverable migration process can contribute to enhancing the on/off ratio in a lead-free CsCu2I3 single-crystal microrod-based photodetector. In detail, we synthesized CsCu2I3 single-crystal microrods via an in-plane self-assembly supersaturated crystallization approach. These microrods with well-defined morphologies were then used to construct ultraviolet (UV)-band photodetectors, which outperform most reported lead-free perovskite photodetectors based on individual single crystals. Simultaneously, ion migration can result in asymmetric band bending in the two-terminal device, as confirmed by surface potential profiling with Kelvin probe force microscopy (KPFM). Such an effect can be harnessed to increase the on/off ratio by almost an order of magnitude. Furthermore, the lead-free CsCu2I3 single crystal exhibits excellent thermal and air stabilities. These findings demonstrate that the CsCu2I3 single-crystal microrods can be used in stable and efficient photodetection, and the ion migration effect can potentially be utilized for improving the optoelectronic performance of lead-free devices.
研究领域:
材料科学
·
光电材料
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Xiaorong Li,Ge Gao,Kaiyu Wang,Zhaoqiong Chen,Zejiang Gao,Qingyong Qin,Li Chen,Bingsuo Zou
With the increasing demand for non-contact fluorescence intensity ratio-based optical thermometry, novel phosphor materials with high-efficiency, dual-emitting centers, and differentiable temperature sensitivity are highly desired. In this work, rare earth Eu 2+ ions were incorporated into CsCu 2 I 3 microcrystals by solid–state reaction. Under a single UV excitation, the as-synthesized samples exhibit two emissions: 452 nm blue emission from the 5d→4f transition of Eu 2+ and 582 nm yellow emission from self-trapped exciton emission of CsCu 2 I 3 . The photoluminescence quantum yield reaches to 50%. The dual-band emission of Eu 2+ -doped CsCu 2 I 3 shows different temperature responses in the range of 260–360 K. Based on fluorescence intensity ratio technology, the maximum absolute sensitivity and relative sensitivity are 0.091 K –1 (at 360 K) and 2.60%/K (at 260 K), respectively. These results suggest that Eu 2+ -doped CsCu 2 I 3 could be a good candidate for highly sensitive optical thermometer.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Exploration
·
2024
·
IF 0
Heng Guo,Linlin Shi,Zengliang Shi,Yue He,Yizhi Zhu
Yellow light-emitting diodes (LEDs) with a wavelength of 570–590 nm can reduce the excitability of peripheral nerves and the sensitivity of the skin, stimulate collagen synthesis, and tighten the skin, which plays an important role in skin rejuvenation. In general, commercial LEDs are made of phosphor excited by ultraviolet chips. It is very important for the development of yellow light emitters with high luminous efficiency, good stability, and environmental protection. For the first time, a simple organic structural unit (2-methylimidazole, 2-MIM) was used to collect a mixture of two metal precursors (CsI and CuI) and successfully synthesized an all-inorganic lead-free yellow light CsCu 2 I 3 powder in water. The prepared CsCu 2 I 3 powder exhibited excellent optical properties and considerable stability. Finally, a phosphor-converted LED (pc-LED) device was fabricated via the CsCu 2 I 3 phosphor coated on a 310 nm ultraviolet chip. The pc-LED device's electroluminescence spectra may be a good fit for the blood's absorption regions. Therefore, this work provides a facile method for the synthesis of novel lead-free metal halide CsCu 2 I 3 powder in eco-friendly solvents. In addition, the stable and efficient CsCu 2 I 3 powder shows promising exciting potential applications in photoluminescence and phototherapy fields.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xiaotong Zhong,Jiale Guo,Jingkun Chen,Xin Shi,Wei Liu,Lin Li,Qianli Li,Jingtai Zhao
Copper halides are widely used in X-ray imaging because of their green non-toxicity, excellent optical properties and simple preparation. Cs 3 Cu 2 I 5 has a higher high photoluminescence quantum yield (PLQY) than CsCu 2 I 3 , but its fluorescence decay time is up to 1.65 μs. Herein, we report a green non-toxicity and low-cost antisolvent preparation of CsCu 2 I 3 microcrystals with bright yellow emission. The fluorescence decay time of the product is as fast as 123 ns and the PLQY is 11.36 %. At the same time, the light yield obtained by this method is 13,454.3 photons/MeV, which is about twice that of the commercial scintillator single crystal Bi 4 Ge 3 O 12 (BGO). In order to avoid transverse light scattering of scintillation films and improve the spatial resolution of X-ray imaging, we also propose a template-assisted and negative pressure filling method for the pixelated CsCu 2 I 3 scintillation array based on Polydimethylsiloxane (PDMS) micropore template. The crosstalk of scintillation light between each column is effectively suppressed, and the spatial resolution of the pixelated CsCu 2 I 3 /PDMS scintillation array is improved. In conclusion, the CsCu 2 I 3 microcrystals with fast decay, high optical properties and good stability, as well as the pixelated CsCu 2 I 3 /PDMS scintillation array that further improve spatial resolution by avoiding transverse scattering of light, provide a feasible solution for guiding copper halide materials as scintillators for X-ray detection and imaging.
研究领域:
材料科学
·
医学影像学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2021
·Vol. 10
·期 4
·2102315
·
IF 9.926
Ziqing Li,Chaolei Zuo,Xinya Liu,Zhuangzhuang Ma,Zhifeng Shi,Xiaosheng Fang
Lead-free ternary copper iodide perovskite analogues demonstrate great potential in photodetector, due to their nontoxity and excellent photophysical properties. However, the fast carrier recombination limits the photoelectric conversion efficiency. Herein, a room-temperature growth strategy with the selected raw ratio is adopted to enhance carrier dynamics. The optimized-grown CsCu 2 I 3 single crystal exhibits longer carrier lifetime of 157 ns, and its switch ratio and response time are enhanced by 20 000% and 600% compared with those of stoichiometric-grown single crystal, respectively. Furthermore, space-confined method is introduced to prepare ultralong single-crystalline CsCu 2 I 3 microbelt, with the aspect ratio up to 600. The sensitivity and self-powered performance of the UV photodetector are improved through constructing heterojunction with p-CuI and asymmetric electrodes. The enhanced performance is ascribed to superior type-II band alignment between CsCu 2 I 3 and CuI, which effectively promotes the separation of photogenerated carriers. This work not only provides an efficient way to boost the photoresponse in low-dimensional metal halide perovskite analogue, but also displays 1D anisotropic growth for potential application in large-area vapor-assisted patterned devices.
研究领域:
材料科学
·
光电探测器
·
半导体物理
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2023
·
IF 11
Peng Ran,Xinya Chen,Zeng Chen,Yirong Su,Juan Hui,Lurong Yang,Tianyu Liu,Xiangyang Tang,Haiming Zhu,Xiao-Jian She,Yang (Michael) Yang
Copper-based halides have emerged as promising scintillator materials for X-ray imaging due to their favorable photophysical characteristics, such as negligible self-absorption, high light output, and fast decay. Among these materials, Cs 3 Cu 2 I 5 , a blue emitter, currently delivers the highest scintillation light output under steady-state X-rays. However, there is a significant spectral mismatch between its emission band and the spectral responsivity of regular flat-panel photodiode arrays. In this study, a comprehensive analysis of the physical properties of the CsCu 2 I 3 scintillator is conducted, and its perfect spectral compatibility is discovered, which results in a higher photodiode signal despite its relatively lower light output compared to typical Cs 3 Cu 2 I 5 scintillators. Furthermore, CsCu 2 I 3 exhibits faster light decay properties, making it especially suitable for Computed Tomography (CT) X-ray imaging. High-quality X-ray cone beam computed tomography (CBCT) imaging is successfully demonstrated using the fast-decaying CsCu 2 I 3 scintillator screen. Additionally, the flexibility of the scintillator allows for non-planar imaging, showcasing advantages not available with traditional rigid scintillators. These results not only highlight the significant promise of the CsCu 2 I 3 scintillator but also emphasize the necessity of considering spectral compatibility when designing novel scintillator materials.
研究领域:
医学影像学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Fengchang Huang,Xiaoming Mo,Xuesong Li,Maolan Peng,Yulu Zhou,Xiaoma Tao,Yifang Ouyang,Jialong Zhao
Lead-free copper(I)-based halides have attracted tremendous attentions in producing optoelectronic devices due to their outstanding optical properties and low-cost synthesis. However, the low efficiency of copper(I)-based halides in the long-wavelength visible emissions (typically yellow- or red-light emissions) has hindered the use of such non-toxic halides in full-color displays and solid-state lighting applications. In this work, lead-free, air-stable and yellow-light emissive CsCu 2 I 3 microplatelets (MPs) with well-defined smooth surface were synthesized by a one-pot anti-solvent solution method at room temperature via surface functionalization with different long-chain surfactants . The results suggested that oleic acid (OA) was the most favorable surfactant for the CsCu 2 I 3 MPs with the best performance. Photoluminescence quantum efficiency of the yellow-emissive CsCu 2 I 3 MPs (centered at 580 nm) was dramatically enhanced fourfold by coordinating OA ligands during the synthesis to eliminate the surface pinholes of the CsCu 2 I 3 MPs. Notably, the CsCu 2 I 3 MPs showed ultra-high stability towards exposure of ambient air over 50 days. These findings may open new directions to synthetize high-efficiency copper(I)-based halides that generate long-wavelength visible emissions for lead-free nontoxic full-color optoelectronic devices.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Sancan Han,Xianyu Qiao,Yimin Li,Fei Wang,Dechao Yu,Jingcheng Xu,Songlin Zhuang,Xiaosheng Fang,Dawei Zhang
Heterogeneous integration of various crystalline materials in electronic and optoelectronic devices have fueled the development of two-dimensional (2D) perovskite single-crystalline (SC) film. However, it is still challenging to synthesize 2D CsCu 2 I 3 SC film due to the uncontrolled nuclei/growth. In the work, the bottleneck for the synthesis of 2D CsCu 2 I 3 SC film can be well tackled by the solution supersaturation and external pressure for the first time, meanwhile, the morphological transformation of CsCu 2 I 3 from dendritic crystal to 2D film are firstly achieved through controlling nucleation driving force. The heterogeneous integration of 2D CsCu 2 I 3 SCs film on various substrates was demonstrated, a self-powered GaN-CsCu 2 I 3 SC film photodetector exhibits high rectification ratio of 1250 (±1 V) with improved responsivity of 460 mA W −1 and EQE of 163 %, which outperforms most reported 2D lead-free halide perovskite film photodetectors. Furthermore, theoretical computational calculation was employed to investigate their crystal structure and electronic distribution, evidencing that 2D CsCu 2 I 3 SC film could facilitate the separation of photo-induced carriers. The study not only shows an in-depth mechanism for perovskite growth, but also advances the development of 2D copper-based perovskite film and hetero-integration, laying the groundwork for future commercial optoelectronics.
研究领域:
材料科学
·
光电技术
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yixuan Lv,Dandan Ma,Chao Yang,Kunli Song,Le Shi,Yonghong Cheng,Chunming Niu,Jian-Wen Shi
Lead-free halide perovskites have enormous superiority in photoelectric devices, but low photocatalytic hydrogen evolution (PHE) hinders their application in photocatalysis. Here, a heterojunction composed of CsCu 2 I 3 (CCI) perovskite and graphite carbon nitride (CN) is constructed by in-situ hot-injection method for the first time. The resultant CCI/CN presents a significantly enhanced PHE performance from hydroiodic acid (HI) splitting with a PHE rate of 2212 umol/g/h, which is four times higher than CCI and nearly ten times higher than CN. It is revealed that a unique N-I bond is formed by the connection of N in CN and I in CCI at the interface between CN and CCI, which serves as a fast channel for the transfer of photogenerated electrons to establish a type II mechanism, effectively promoting the PHE performance. This study provides ideas and methods for the construction of type II photocatalyst for hydrogen production using lead-free halide perovskite.
研究领域:
材料科学
·
光催化
·
可再生能源
✓ 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）