RSC Advances
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2019
·Vol. 9
·期 72
·42430-42437
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IF 3.049
Shangxuan Huang,Sen Yang,Qi Wang,Ruirui Wu,Qiuju Han,Wenzhi Wu
Cs4PbBr6/CsPbBr3 perovskite composites are fabricated by room-temperature one-pot mixing synthesis, which is short in time, free from inert gases and delivers a high product yield. Temperature-dependent photoluminescence shows that a larger exciton binding energy of 291.1 meV exhibits better thermal stability compared with that of pure Cs4PbBr6 and CsPbBr3 materials. The CIE chromaticity coordinates (0.1380, 0.7236) of green LEDs designed with Cs4PbBr6/CsPbBr3 perovskite composites show almost no variation under driving current changing from 5 to 30 mA. Furthermore, the ground Cs4PbBr6/CsPbBr3 perovskite composites mixed with red emitting K2SiF6:Mn4+ phosphor are dropped and casted on a blue-emitting InGaN chip. The white light emitting diodes (WLEDs) are presented, which have good luminous efficiency of 65.33 lm W−1 at 20 mA, a correlated color temperature of 5190 K, and the white gamut with chromaticity coordinate of (0.3392, 0.3336). According to the state of art, these excellent characteristics observed are much superior to the reported results of conventional perovskite-based WLEDs, which demonstrate the immense potential and great prospect of Cs4PbBr6/CsPbBr3 perovskite composites to replace conventional phosphors in lighting devices.
研究领域:
材料科学
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光学工程
·
半导体技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2022
·Vol. 24
·期 3
·69
·
IF 2.533
Song Rong,Li Ying,Qian Jun
Perovskite has shown attractive optoelectronic performances and is a potential material in lighting, anti-counterfeiting, sensor, and other optoelectronic devices. Recently, spin-coating has been widely used in fabricating high-performance perovskite films, but it is difficult to process and apply in practice. In this paper, the CsPbBr 3 /Cs 4 PbBr 6 composite perovskite quantum dots with photoluminescence quantum yield of 36% and high storage stability were prepared by using room temperature ligand-assisted precipitation method and controlling the proportion of CsBr/PbBr 2 . In addition, the composite perovskite was ground and dispersed in the inks system. After adjusting the composition and ratio of the resin components, the inks were suitable for screen printing with a viscosity of 2439 mPa•s, an initial dryness of 25 mm/30 s, and a thorough dryness of 100 s/100 μm. By printing, the perovskite films exhibited high coverage, strong green emission, and outstanding fluorescence recovery ability after exposure to water. Screen printing perovskite inks have the characteristic of being patternable, which provides a solution for preparing a perovskite film in the application.
研究领域:
材料科学
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纳米科技
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光电子学
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印刷电子
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荧光材料
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2022
·
IF 5.6
Min Yang,Yujia Yan,Enzhou Liu,Qian Sun,Jun Fan
In recent years, all-inorganic perovskite has been extensively studied due to its excellent photoelectric properties, but the application of Cs n PbBr 2+ n perovskite with excellent stability in the field of chemical sensing has yet to be developed. Herein, Cs 4 PbBr 6 /CsPbBr 3 with good stability was successfully prepared by controlling the synthesis temperature to 100 ° C. The fluorescence intensity of Cs 4 PbBr 6 /CsPbBr 3 exhibited 2,4-dinitriphenylhydrazine (DNPH) concentration-dependent characteristics and could be used for sensing DNPH based on the dynamic quenching process triggered by the collision between Cs 4 PbBr 6 /CsPbBr 3 and DNPH. A good linear model was established based on the detection signal and DNPH concentration in the range of 0.05∼30 mg/L and the detection limit was 0.033 mg/L. This method was applied to detect DNPH in soil and tap water samples with satisfactory results obtained. Therefore, this research broadens the application of Cs n PbBr 2+ n in the field of quantitative detection and is expected to be developed into a fluorescent sensor for the detection of hydrazine substances.
研究领域:
分析化学
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材料科学
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环境监测
·
传感器技术
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光电子学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Ya-Meng Chen,Yang Zhou,Qing Zhao,Jun-Ying Zhang,Ju-Ping Ma,Tong-Tong Xuan,Shao-Qiang Guo,Zi-Jun Yong,Jing Wang,Yoshihiro Kuroiwa,Chikako Moriyoshi,Hong-Tao Sun
All-inorganic perovskites have emerged as a new class of phosphor materials owing to their outstanding optical properties. Zero-dimensional inorganic perovskites, in particular the Cs4PbBr6-related systems, are inspiring intensive research owing to the high photoluminescence quantum yield (PLQY) and good stability. However, synthesizing such perovskites with high PLQYs through an environment-friendly, cost-effective, scalable, and high-yield approach remains challenging, and their luminescence mechanisms has been elusive. Here, we report a simple, scalable, room-temperature self-assembly strategy for the synthesis of Cs4PbBr6/CsPbBr3 perovskite composites with near-unity PLQY (95%), high product yield (71%), and good stability using low-cost, low-toxicity chemicals as precursors. A broad range of experimental and theoretical characterizations suggest that the high-efficiency PL originates from CsPbBr3 nanocrystals well passivated by the zero-dimensional Cs4PbBr6 matrix that forms based on a dissolution–crystallization process. These findings underscore the importance in accurately identifying the phase purity of zero-dimensional perovskites by synchrotron X-ray technique to gain deep insights into the structure–property relationship. Additionally, we demonstrate that green-emitting Cs4PbBr6/CsPbBr3, combined with red-emitting K2SiF6:Mn4+, can be used for the construction of WLEDs. Our work may pave the way for the use of such composite perovskites as highly luminescent emitters in various applications such as lighting, displays, and other optoelectronic and photonic devices.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Photonics
·
2024
·
IF 6.5
Xiaoting Wang,Qianxi Yin,Rongrong Xu,Yu Gu,Xianliang Huang,Mulin Li,Teng Ma,Ziyi Chen,Jun Chen,Haibo Zeng
Birefringent crystals have the ability to modulate polarized light, which has important applications in the field of optoelectronics. Waveplates are important devices in polarization optics to modulate the polarization and phase delay of light over a wide band of wavelength. However, conventional designs of half-wave plates and quarter-wave plates involve multiple birefringent crystals, and the fabrication process is complex and costly. Here, we report the discovery of a multiwavelength (532–785 nm) temperature-controlled phase modulator based on Cs4PbBr6/CsPbBr3 perovskite crystals. It is the crystal lattice expansion that is causing the variation of the birefringence factor of Cs4PbBr6/CsPbBr3 through observing crystal optical properties. The transmitted 633 nm light can be temperature-modulated to achieve the switching of optical polarization states between circularly polarized and linearly polarized states, revealing that the same crystal can switch between the functions of half-wave plates and quarter-wave plates. Other wavelengths of transmitted light can also change optical polarization states through temperature control. Given the versatility of halide perovskite-based crystals, Cs4PbBr6/CsPbBr3 crystals offer a promising approach for producing waveplates and other optical devices at a lower cost.
研究领域:
光学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Zhigang Yang,Shuqin Zhang,Junshuai Chen,Tianqing Sheng,Xinran Lv,Xuguang Wei,Guoqiang Qin,Gang Yu
Owing to inherent structural instability of perovskite quantum dots, they are instability in humid environments and high temperatures conditions. To address this issue, a simple, environmentally friendly glass encapsulated technology is used to protect the perovskite quantum dots. Meanwhile, the dual-phase perovskite structure realized by phase transition engineering can further increase the stability of perovskite quantum dots. In this study, 3D CsPbBr 3 /0D Cs 4 PbBr 6 dual-phase coexisting perovskite quantum dot glass powders were synthesized through melt quenching and subsequent crystallization induction of thermal treatment and water molecule, respectively. Results showed that compared with thermal treatment induction, perovskite QDs glass powders by water molecules induction exhibited a high PLQY of 24.7 % with a central wavelength of 519 nm and displayed excellent environmental stability. By combining green fluorescence from 3D CsPbBr 3 /0D Cs 4 PbBr 6 QDs glass powders and red fluorescence powders (CaAlSiN 3 :Eu), a WLED device with an impressive EQE of 20.6 % was created, indicating a promising application potential.
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
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 16
·4733-4739
·
IF 6.641
Guomiao Hu,Wenjing Qin,Manman Liu,Xiaoxue Ren,Xiaoming Wu,Liying Yang,Shougen Yin
All-inorganic halide perovskites have attracted significant attention because of their excellent photoelectric performance. However, several remaining challenges, including large-scale synthesis, strict limitations on the experimental conditions, and material stability, limit their practical application. In this study, we propose a simple ligand-assisted supersaturated recrystallization (LASR) procedure in order to prepare perovskite-related plum-pudding-like Cs4PbBr6/CsPbBr3 microcrystals (MCs) on a large scale and at room temperature. The LASR approach was proved to rely on the selection of an appropriate antisolvent. The synthesized Cs4PbBr6/CsPbBr3 MCs exhibit strong green emission at 520 nm with a narrow full-width at half-maximum (FWHM) value of 20 nm originating from the CsPbBr3 nanocrystals (NCs) embedded in the Cs4PbBr6 MCs. Additionally, the environmental stability experiment showed ∼20% PL intensity loss after storage under ambient conditions with 50% relative humidity (RH) for 2 months.
研究领域:
材料科学
·
纳米技术
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光电子学
·
钙钛矿材料
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2020
·Vol. 8
·期 13
·2000232
·
IF 8.286
Xiang Li,Zuoliang Wen,Shihao Ding,Fan Fang,Bing Xu,Jiayun Sun,Chenxi Liu,Kai Wang,Xiao Wei Sun
A modified supersaturated recrystallization method for in situ fabrication of Cs 4 PbBr 6 /CsPbBr 3 nanocomposite containing polymer films is reported. This facile and efficient strategy can be easily carried out at room temperature, and minimizes the contact time between CsPbBr 3 nanocrystals and water and oxygen molecules during the formation of perovskite film, passivating the perovskite nanocrystals. Through the approach, the dual protection of Cs 4 PbBr 6 and polymer matrix enhances the water stability and photostability of emitting CsPbBr 3 . Even after being immersed in water for 30 days, the Cs 4 PbBr 6 /CsPbBr 3 @PMMA film still retains a bright green fluorescence. Moreover, combining the as-prepared green-emitting Cs 4 PbBr 6 /CsPbBr 3 @PMMA and a red-emitting CdSe/ZnS based quantum dots (QDs) polymer film with blue light emitting diode (LED) chips as the backlight, a high performance liquid crystal display (LCD) is demonstrated. The color gamut of the demonstrated display is 131% and 98% that of the NTSC 1953 and Rec.2020, respectively. The combination of better stability and improved color purity of the perovskite material intuitively provides a viable approach for LCD backlights.
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DOI
高影响因子
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