MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Yuting Wang,Xiong Shen,Chenggang Yuan,Bingkun Chen,Lin Chen,Zhongming Wang,Fei Hu,Qiuyun Ouyang
Halide perovskite (Cs 3 Cu 2 Br 5 ) is synthesized by a thermal injection method. The X-ray diffraction (XRD) proves that the Cs 3 Cu 2 Br 5 crystal phase is an intersection phase. The Cs 3 Cu 2 Br 5 organic glasses are fabricated by dispersing Cs 3 Cu 2 Br 5 materials in methyl methacrylate (MMA). The nonlinear absorption (NLA) and the nonlinear refraction (NLR) performances of Cs 3 Cu 2 Br 5 /PMMA organic glasses are measured via the open-aperture (OA) and the closed-aperture (CA) Z-scan technique, respectively. The samples show typical reverse saturable absorption (RSA) and self-focusing effect with the change of input energy (40–72 μJ). Meanwhile, the room-temperature photo-luminescence (PL) measurement reveals light emission for Cs 3 Cu 2 Br 5 . The effects on nonlinear optical (NLO) properties are investigated by controlling the input energy and the amount of the sample. The Cs 3 Cu 2 Br 5 /PMMA organic glasses exhibit excellent NLA and NLR properties. The NLA coefficient of (Cs 3 Cu 2 Br 5 ) 18 /PMMA organic glass is much higher than those of lead-containing perovskite such as CsPbCl 3 and CsPbBr 3 nanosheets . This results in Cs 3 Cu 2 Br 5 /PMMA organic glasses show superior optical limiting (OL) performance. The Cs 3 Cu 2 Br 5 perovskite materials show great potential in devices such as light-emitting diodes and optical switches.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2025
·
IF 2.6
Yinkun Liao,Yibo Hu,Yuanhao Zhou,Jingkun Chen,Xue Yang,Meng Gu,Kuan Ren,Jingtai Zhao,Qianli Li,He Feng
Copper halide scintillation materials with self-trapped exciton (STE) photoluminescence have attracted great interest in the field of optoelectronics. However, it is challenging for Cs3Cu2Br5 materials to achieve wider spectral emission and high spatial resolution X-ray imaging in applications. Herein, combining XRD and energy dispersive spectroscopy results, it is proved that Ag+ is doped into the Cs3Cu2Br5 lattice through an ion doping process, and PL is regulated from 460 nm to 543 nm. By density functional theory calculation, the band gap is reduced from 2.25 eV of Cs3Cu2Br5 to 1.99 eV of Cs3Cu2Br5:Ag, which is also consistent with the spectral redshift. The gradient study of the silver ion concentration from 5% to 35% shows that the best silver ion concentration is 25%. The experimental results show that the doped silver ions can improve the PL, PLE, PLQY, XEL and other properties of the material, such as the PLQY which increased from 27.38% to 90.62%. At the same time, Cs3Cu2Br5:Ag also has good stability, it can be stored in air for 30 days, and its PL intensity remains at 90.73%. The X-ray space of the Cs3Cu2Br5:Ag-UV scintillation film measured in a laboratory imaging system can reach 18.3 lp mm−1.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2021
·
IF 8.301
Xiaoyong Huang,Shaoying Wang,Balaji Devakumar,Nan Ma
The development of new efficient and environmental-friendly inorganic phosphors is highly important for phosphor-converted white light-emitting diodes and optoelectronic displays. In this paper, we report a novel and simple one-step solid-state reaction to synthesize lead-free cesium copper halide Cs 3 Cu 2 Br 5 powders with bright blue emission around 460 nm. The preparation process is performed at low calcination temperatures (290–320 °C) and requires no complex apparatus, reagents, or techniques, and thus it holds great potential for mass production of halide emitters. The Cs 3 Cu 2 Br 5 powder phosphors are characterized by X-ray diffraction, field-emission scanning electron microscopy, energy dispersive X-ray spectroscopy, photoluminescence excitation and emission spectroscopy , CIE color coordinates, color purity, photoluminescence quantum yield, and temperature-dependent emission spectra . The effect of calcination temperature on the photoluminescence properties of the as-prepared Cs 3 Cu 2 Br 5 blue phosphors has been investigated and the air-stability property has also been discussed. Impressively, Cs 3 Cu 2 Br 5 blue phosphors show outstanding stability toward air exposure exceeding one month (30 days). Our work will open a new and simple approach to obtain excellent halide emitters for future solid-state lighting and displays.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2025
·
IF 1.9
Can Chen,Jianguo Pan,Hai chao Zhou,Jia li Han,Xinxin Chen,Shangke Pan
In recent years, Copper(I)-based inorganic halides have garnered significant interest for their exceptional optical properties. In this paper, Cs 3 Cu 2 Br 5 single crystals are grown by the vertical Bridgman method, resulting in large transparent single crystals ≈40 mm in length. The crystals are characterized by X-ray diffraction (XRD) and differential thermal analysis (DTA). Transmission spectra, photoluminescence (PL), temperature-dependent fluorescence spectra, X-ray excitation spectra, and photoluminescence decay time are also measured. The results indicate that the Cs 3 Cu 2 Br 5 single crystal exhibits good optical transmittance of 85% in the wavelength range of 250–800 nm and a large direct bandgap of 3.85 eV. The Cs 3 Cu 2 Br 5 single crystal displays intense broadband blue luminescence, featuring significant Stokes shifts, a microsecond-long fluorescence lifetime decay, and higher quantum yield, all attributed to self-trapped exciton emission. The temperature-dependent fluorescence spectra of the crystals are measured to analyze the luminescence mechanism. In summary, the research indicates that the Cs 3 Cu 2 Br 5 single crystal has certain potential applications in the field of photodetectors, light-emitting diodes, scintillators, etc.
研究领域:
材料科学
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光学材料
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固体物理
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晶体生长
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半导体物理
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光子学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Dehai Liang,Lin Tan,Shirong Lu,Zhe Sun,Huaxin Wang,Wensi Cai,Zhigang Zang
Inorganic perovskites CsPbX3 (X = Cl, Br, I) have shown great potential as luminescent materials for a wide range of photoelectric devices. However, the practical use of these materials is limited due to the toxicity of lead and poor stability. Here, we present a facile low-temperature, solution-based method to synthesize lead-free and highly stable Cs3Cu2Br5 single crystals (SCs) without the use of organic solvents. Owing to the self-trapped exciton emissions, Cs3Cu2Br5 SCs exhibit a strong broadband blue emission with a high photoluminescence quantum yield (PLQY) upon 254 nm ultraviolet light excitation. In addition, the Cs3Cu2Br5 SCs show a high stability against heat, humidity, and UV light. Therefore, the Cs3Cu2Br5 SCs are utilized as emitters in white light emitting diodes (WLEDs), demonstrating a high color rendering index of 81 and a decent commission internationale de l’Eclairage coordinate of (0.30, 0.34). Furthermore, the prepared WLEDs are used in wireless visible light communications, showing a −3 dB bandwidth of 6.7 MHz and an achievable data rate of 45 Mbps. Our study provides a novel organic-solvent-free, low-temperature method to synthesize Cs3Cu2Br5 SCs and could promote the development of Cu-based metal halides in visible light communications.
研究领域:
材料科学
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光电技术
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光子学
✓ 已验证
DOI
高影响因子
Advanced Photonics Research
·
2022
·Vol. 3
·期 4
·2100289
·
IF 0
Xixi Zheng,Jinxin Huang,Yaoyu Liu,Tianyu Wang,Shiguo Han,Zongqi Wang,Bing Teng,Shaohua Ji
Owing to their excellent photoelectric properties, perovskite materials have broad application prospects; however, the toxicity of Pb limits the application of Pb-based perovskite materials. To overcome this problem, Pb-free perovskite materials are prepared by replacing Pb with nontoxic elements including Ge and Sn; nevertheless, the stabilities of these materials are low. Herein, single crystals of nontoxic Cu(I)-based ternary metal halide (Cs 3 Cu 2 Br 5 ) with outstanding stabilities and self-trapped excition (STE) emission are constructed by an antisolvent method for the first time; these crystals exhibit central blue emission at 458 nm and large Stokes shifts. Photoluminescence (PL) intensities of the single crystals remain above 96.9% of their initial intensities when these crystals are exposed to an atmospheric environment for 90 days. Moreover, the stabilities of the Cs 3 Cu 2 Br 5 single crystals are investigated by temperature-dependent PL spectroscopy, which suggests a considerable exciton binding energy of 503 meV, and derivative thermogravimetric analysis, which indicate that the temperature of complete decomposition of Cs 3 Cu 2 Br 5 is above 930 °C. Furthermore, a new class of white light-emitting diodes with an ultrahigh color rendering index of 97.8 and satisfactory performance is produced using the Cs 3 Cu 2 Br 5 single crystals. The study demonstrates significant potentials of Cu(I)-based single crystals in the field of optoelectronics.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
Advanced Materials Interfaces
·
2022
·Vol. 10
·期 6
·2201938
·
IF 6.389
Yaoyu Liu,Xixi Zheng,Zongshuai Ji,Tianyu Wang,Haixia Yu,Bing Teng,Shaohua Ji
The zero-dimensional perovskite-like derivative Cs 3 Cu 2 X 5 (X = Cl, Br, I) with self-trapped excitons (STEs) photoluminescence (PL) has attracted tremendous interest in the field of optoelectronics. Nonetheless, it is challenging for Cs 3 Cu 2 Br 5 material to attain full visible spectrum emission and prevent light-induced photochemical damage to the retina (blue light hazard) in applications. Herein, Mn 2+ is chosen as the dopant to alloy into Cs 3 Cu 2 X 5 via a one-step solid state synthesis method. Significantly, the series of Mn 2+ -doped show the emission peak of 460 nm STEs and the emission peak of 550 nm Mn 2+ . More importantly, the high energy absorption of Mn 2+ facilitates the transfer of exciton energy, contributing to a reduction in blue emission peak at 460 nm. Simultaneously, ≈17.5% of Mn 2+ is alloyed into the Cs 3 Cu 2 X 5 lattice to induce the energy transfer channels from the Cs 3 Cu 2 X 5 host to the Mn 2+ guest to lead to the emission of Mn 2+ , which broadens emission spectrum (400–620 nm) and realizes 80% reduction of the blue emission peak at 460 nm. Additionally, a white light-emitting diodes can decrease the blue emission band via 71.45% and an ultrahigh color rendering index (CRI) of 94.5 is produced using the 17.5% Mn 2+ : Cs 3 Cu 2 X 5 perovskite-like derivative powder material.
研究领域:
光学
·
材料科学
·
生物医学工程
✓ 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）