ACS Nano
·
2019
·
IF 13.903
Fei Cao,Dejian Yu,Wenbo Ma,Xiaobao Xu,Bo Cai,Yang Michael Yang,Sinan Liu,Lunhua He,Yubin Ke,Si Lan,Kwang-Leong Choy,Haibo Zeng
Halide perovskite (HP) nanocrystals (NCs) have recently shown great potential for X-ray detection and imaging. However, the practical application still has a long way to go with many technical requirements waiting to be fulfilled, including structure optimization, stability enhancement, and cost reduction. A design principle in this beginning stage is urgently needed but still lacking. Herein, with an “emitter-in-matrix” principle refined from commercial scintillators, CsPbBr3@Cs4PbBr6 with emissive CsPbBr3 NCs embedded inside a solid-state Cs4PbBr6 host is subjected to X-ray sensing and imaging. The Cs4PbBr6 matrix not only enhances the attenuation of X-rays but also dramatically improves the stability of CsPbBr3 NCs. A favorable optical design with the Cs4PbBr6 matrix being transparent to the emission from CsPbBr3 NCs enables efficient light output. As a result, stable and sensitive scintillation response to X-ray signals is demonstrated with superior linearity and ultrahigh time resolution. In order to show the huge potential for practical applications, X-ray imaging using a large-area film (360 mm × 240 mm) by the blade-coating technique is carried out to obtain a high-quality image of interior structures invisible to the human eye. In addition to the above advantages in optics, CsPbBr3@Cs4PbBr6 also enjoys facile solution synthesis with large scalability, excellent repeatability, and low cost.
研究领域:
材料科学
·
放射学
·
光学
·
纳米技术
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zhiqiang Ren,Xinyi Deng,Changwen Li,Shoujun Xiong,Changwei Li,Jinhua Li,Lai Wei,Jianying Wang
Conventional perovskite nanocrystals (PNCs)-based luminescent solar concentrators (LSCs) suffer low loading, reduced transparency and poor moisture/oxygen/light/ thermal stability. To solve the above issues, in this work, we report the preparation of Cs 4 PbBr 6 @PMMA perovskite particles for the first time, which exhibit a green luminescence with emission wavelength of 517 nm and a photoluminescence quantum yield (PLQY) of 32.9 %. The prepared Cs 4 PbBr 6 @PMMA perovskite particles are utilized as fluorescent materials while the PMMA serve as a waveguide material for fabrication of single-layer LSCs. On one hand, the Cs 4 PbBr 6 @PMMA perovskite particles are well-dispersed in the PMMA, demonstrating excellent compatibility and good transparency at high loading (>60 % over 600 nm at the loading of 39.3 wt%). Furthermore, the single-layer LSCs exhibit external optical efficiency ( η opt ) from 2.26 % to 3.50 % with increased loading from 14.0 % to 39.3 wt%. On the other hand, the surface-grafted PMMA provides robust protection for the perovskite particles, significantly improving the stability of the LSCs. The LSCs can retain over 90 % of their initial η opt after two weeks under harsh conditions of high relative humidity (RH = 90 %) and high temperature (60 °C) and sunlight exposure. The single-layer LSCs also maintain over 81.9 % of their initial η opt after 10 months under indoor daylight storage conditions.
研究领域:
材料科学
·
能源技术
·
光学工程
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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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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Qingye Zhang,Feiyu Diao,Yiqian Wang
Compared to the high-temperature hot injection (HI) technique, the room-temperature supersaturated recrystallization (SR) approach is more hopeful to realize the industrialized production of CsPbX3 (X = Cl, Br, and I) nanomaterials. However, accurate compositional control of the product is still difficult, and the role and underlying mechanism of antisolvents in the reprecipitation process remain unclear. Herein, CsPbBr3 particles and CsPbBr3/Cs4PbBr6 composites with certain proportions are synthesized using different antisolvents with the SR method. By adjustment of the polarity or functional group of antisolvents, it is found that the functional groups of antisolvents have a major impact on the composition of the products. Furthermore, the influential mechanism of different antisolvents on the compositions of products is investigated by combining electrostatic potential calculations and ultraviolet–visible absorption spectroscopy. It suggests that the interaction between functional groups of antisolvents and organic ligands influences the coordination status of the intermediate Pb-complex and further affects the separating rate of the Pb(II)-intermediate, leading to the formation of products with different compositions. A physicochemical mechanism is proposed to explain the formation of Cs4PbBr6 and CsPbBr3. This work deepens the understanding of the formation mechanism of all-inorganic metal halide perovskite-related materials based on the SR method and provides new routes to achieve their controllable preparation.
研究领域:
材料科学
·
纳米技术
·
无机化学
·
钙钛矿材料合成
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DOI
高影响因子
Advanced Optical Materials
·
2026
·Vol. 14
·期 34
·e71654
·
IF 7.2
Jiaqi Zhao,Yuan Wang,Laipeng Sun,Ting Li,Yu Wang
A defect-induced strategy is employed to synthesize chiral zero-dimensional Cs 4 PbBr 6 perovskite nanocrystals (NCs) with blue photoluminescence via a phase transformation process. Both the circular dichroism (CD) and circularly polarized luminescence (CPL) spectra of them exhibit characteristic mirror-symmetric signals, confirming the presence of ground-state chirality and excited-state chirality. The transmission electron microscopy (TEM) images and electron paramagnetic resonance spectra (EPR) indicate that the strong blue photoluminescence and CPL response originate from the generation of bromine defects. Particularly, the change in the ratio of ligands not only leads to CD inversion, but also can give rise to CPL inversion. The Ultrafast spectroscopy transient absorption (TA) spectra further show that the CPL response of chiral Cs 4 PbBr 6 NCs originates from the spin-polarization process. The reversal of the CPL signal can be attributed to the changes of energy band structure due to conformational changes with respect to S/R -MBA (MBA = α-Methylbenzylamine) ligands in chiral perovskite NCs. It indicates that the conformational change of chiral ligands can modulate the energy band structure of chiral Cs 4 PbBr 6 perovskite NCs with keeping the crystallographic structure constant. Furthermore, the universality of the defect induction strategy can be confirmed by using EBA (EBA = ethylbenzylamine), CHEA (CHEA = cyclohexylethylamine), and NEA (NEA = 1-(1-Naphthyl) ethylamine) as chiral precursors.
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高影响因子
OPTICS LETTERS
·
2022
·Vol. 47
·期 13
·3335-3338
·
IF 3.56
Xiaoqing Liu,Yang Lu,Ran Wei,Siyuan Fu,Shiqing Xu,Junjie Zhang
Zero-dimensional Cs4PbBr6−xIx perovskite quantum dots (PQDs) glass is successfully prepared via a melt quenching method, which provides infinite possibilities for achieving the whole family of zero-dimensional PQDs glass. The test results demonstrate excellent thermal stability and high photoluminescence quantum yields (PLQYs) of Cs4PbBr6−xIx PQDs glass (up to 50%). Finally, the combination of Cs4PbBr6−xIx PQDs glass with an InGaN blue chip is used to fabricate white light-emitting diodes (WLED), which show good color stability at a large operating current, and the color gamut area reaches 137% of NTSC. The above results indicate that zero-dimensional Cs4PbBr6−xIx PQDs glass materials have a broad application prospect in the display lighting field.
研究领域:
材料科学
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光学工程
·
显示技术
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高影响因子
Small
·
2023
·
IF 13.3
Rui Gao,Wanqing Xu,Zhiqing Wang,Fen Li,Yueli Liu,Guogang Li,Keqiang Chen
Synthesis of upconversion nanoparticles (UCNPs)-metal halide perovskites (MHPs) heterostructure is garnered immense attentions due to their unparalleled photophysical properties. However, the obvious difference in their structural forms makes it a huge challenge. Herein, hexagonal β-NaYF 4 and hexagonal Cs 4 PbBr 6 are filtrated to construct the UCNP/MHP heterostructural luminescent material. The similarity in their crystal structures facilitate the heteroepitaxial growth of Cs 4 PbBr 6 on the surface of β-NaYF 4 NPs, leading to the formation of high-quality β-NaYF 4 :Yb,Tm/Cs 4 PbBr 6 core/shell nanocrystals (NCs). Interestingly, this heterostructure endows the core/shell NCs with typically narrow-band green emission centered at 524 nm under 980 nm excitation, which should be attributed to the Förster resonance energy transfer (FRET) from Tm 3+ to Cs 4 PbBr 6 . It is noteworthy that the FRET efficiency of β-NaYF 4 :Yb,Tm/Cs 4 PbBr 6 core/shell NCs (58.33%) is much higher than that of the physically mixed sample (1.84%). In addition, the reduced defect density, lattice anchoring effect, as well as diluted ionic bonding proportion induced by the core/shell structure further increase the excellent water-resistance and thermal cycling stability of Cs 4 PbBr 6 . These findings open up a new way to construct UCNP/MHP heterostructure with better multi-code luminescence performance and stability and promote its wide optoelectronic applications.
研究领域:
材料科学
·
光学
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DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 16
·1706567
·
IF 13.325
Xiaomei Chen,Feng Zhang,Yong Ge,Lifu Shi,Sheng Huang,Jialun Tang,Zhao Lv,Li Zhang,Bingsuo Zou,Haizheng Zhong
An HBr-assisted slow cooling method is developed for the growth of centimeter-sized Cs 4 PbBr 6 crystals. The obtained crystals show strong green photoluminescence with absolute photoluminescence quantum yields up to 97%. More importantly, the evolution process and structural characterizations support that the nonstoichiometry of initial Cs 4 PbBr 6 crystals induce the formation of nanosized CsPbBr 3 nanocrystals in crystalline Cs 4 PbBr 6 matrices. Furthermore, high efficiency and wide color gamut prototype white light-emitting diode devices are also demonstrated by combining the highly luminescent Cs 4 PbBr 6 crystals as green emitters and commercial K 2 SiF 6 :Mn 4+ phosphor as red emitters with blue emitting GaN chips. The optimized devices generate high-quality white light with luminous efficiency of ≈151 lm W −1 and color gamut of 90.6% Rec. 2020 at 20 mA, which is much better than that based on conventional perovskite nanocrystals. The combination of improved efficiency and better stability with comparable color quality provides an alternative choice for liquid crystal display backlights.
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高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 26
·期 1
·373-380
·
IF 3.3
Wenfang Peng,Rongrong Hu,Bobo Yang,Qiaoyun Wu,Pan Liang,Lin Cheng,Xixi Cheng,Yuefeng Li,Jun Zou
Metal halide perovskites are particularly emerging for optoelectronic applications in light-emitting diodes, photodetectors, and solar cells due to their flourishing photophysical properties. However, the poor stability of three-dimensional (3D) lead halide perovskite nanocrystals (NCs) significantly hampers their optoelectronics and photovoltaics applications. Embedding 3D perovskites into zero-dimensional (0D) perovskite crystals and doping ions of appropriate elements into host lattices provide effective approaches to improve the stability and optical-electronic performance. In this study, millimeter-scale Mn-doped and undoped CsPbBr3/Cs4PbBr6 perovskite crystals were successfully fabricated by a one-step slow cooling method. We systematically investigated the effects of Mn2+ ion doping on the PL performance and stability of CsPbBr3/Cs4PbBr6 crystals. Compared with undoped crystals, the existence of Mn2+ ions not only blue-shifted the PL peak but also improved the luminescence performance and stability of the prepared millimeter-sized crystals. Moreover, doping Mn2+ ions can increase the proportion of radiative recombination at low temperature, which may be because Mn2+ ions can effectively accelerate the decay of a dark exciton by the magnetic mixing of bright and dark excitons. In addition, green LED devices with high efficiency packaged as-grown crystals are explored, which promises further application in display backlights.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yandong Ren,Jianbo Hua,Zhongxu Han,Mengsi Sun,Shuchen Lü
Halide Perovskite light emitting diodes (LEDs) have attracted enormous attention due to their remarkable optoelectronic properties, facile bandgap tunability and low-cost. Here, we successfully synthesized the centimeter-sized pure non-emissive Cs 4 PbBr 6 , hybrid green-emitting Cs 4 PbBr 6 @CsPbBr 3 (H-Cs 4 PbBr 6 ) and ligand-induced H-Cs 4 PbBr 6 single crystals (SCs) via the precision-temperature-gradient crystallization method. The detailed formation process of H-Cs 4 PbBr 6 was detected by a real-time optical photograph and ultraviolet lamp during different growth stages ranged from colorless transparent to bright green. Notably, the H-Cs 4 PbBr 6 SC shows the behavior of excellent luminous properties (PLQY = 92 %) owing to the higher exciton binding energy, which is estimated to be ∼439.8 meV. The unusual intense green photoluminescence mechanism is evidenced by the various measurements, which can be attributed to the embedded CsPbBr 3 nanocrystals. Interestingly, the excellent long-term stabilities of as-prepared H-Cs 4 PbBr 6 SC against heat, and environment oxygen/moisture degradation are reported, which maintains high fluorescence brightness for 3 years in air, and then for more than 4 days under 80 °C and 80 % relative humidity without additional encapsulation. A larger activation energy of 461.1 meV exhibits the better thermal stability. Furthermore, an adjustment of the PL emission of H-Cs 4 PbBr 6 SCs is first achieved with the addition of ligands. Ultrapure green LED fabricated with the whole large Cs 4 PbBr 6 SC exhibits wonderful performance with luminous efficiency of 20.50 lm·W −1 , excellent color purity of ∼90.7 % and external quantum efficiency of 5.43 %, which demonstrate the immense potential and great prospect of H-Cs 4 PbBr 6 perovskite composites to replace conventional phosphors in lighting devices.
研究领域:
材料科学
·
光电子学
·
半导体物理
·
发光器件
·
晶体工程
·
纳米材料
·
固态照明
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yichi Zhong,Jian Huang,Yuan Xiang,Kun Qian,Zhanpeng Wang,Qian Wang,Jingzhou Li,Hongxing Dong,Long Zhang
Zero-dimensional perovskite Cs 4 PbBr 6 nanocrystals have attracted considerable attention for their potential in optoelectronic and sensing applications due to their excellent optoelectronic properties and environmental stability. However, their non-emissive property has limited their development in luminescent applications. Fortunately, the reversible phase transition between Cs 4 PbBr 6 and CsPbBr 3 nanocrystals provides a promising strategy to address this limitation. This study investigates the phase transition mechanism induced by the micro-environment factors, with a particular focus on the evolution of optical properties. Small droplets of Cs 4 PbBr 6 nanocrystals were exposed to air, and real-time monitoring of their color changes and photoluminescent emission characteristics was conducted. The results reveal that the large surface area of the droplet facilitates solvent evaporation, which accelerates the phase transition of Cs 4 PbBr 6 nanocrystals, leading to a significant enhancement in photoluminescent brightness. By quantitatively correlating environmental humidity with the phase conversion rate, this work highlights the critical role of humidity in modulating the conversion kinetics. Furthermore, the study systematically explores the mechanism of tuning the photoluminescent emission peak by adjusting the surface ligands, which enables the development of an environment-responsive, color-changing optical device based on droplet dynamics.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Cong He,Chunwen Ye,Meng Wu,Shiwei Yang,Peiyuan Zhuang,Jiawei Song,Yanjie Zhang
Halide perovskite nanocrystals (NCs) including CsPbBr 3 as the most typical composition , have attracted widespread attention due to their excellent photovoltaic properties . However, CsPbBr 3 NCs encounter the serious problem of instability and luminescent quenching when removing protection from their colloidal solution. Herein, a facile room-temperature saturation recrystallization process is employed to form CsPbBr 3 NCs with an average particle size of ∼1.8 nm on the surface of Cs 4 PbBr 6 support through adjusting Cs/Pb molar ratios (1−10). Interestingly, CsPbBr 3 /Cs 4 PbBr 6 powders with Cs/Pb ratio = 7 exhibit an ultra-high quantum yield of ∼98 %. Accordingly, the photoluminescence intensity of CsPbBr 3 /Cs 4 PbBr 6 powders with Cs/Pb ratio = 7 is greatly enhanced by about 2900-fold higher than the sample with a Cs/Pb ratio of 1 due to the formation of CsPbBr 3 /Cs 4 PbBr 6 heterojunction structure. Subsequently, CsPbBr 3 /Cs 4 PbBr 6 powders are encapsulated in a SBA-15 mesoporous silica and calcined at 700ºC to improve water-resistance properties, which can keep stable in water for more than 100 days. These CsPbBr 3 /Cs 4 PbBr 6 -SBA-15 composites show potential applications in white light-emitting diodes, display light sources , and flexible luminescent films in the field of wearable devices. This work provides a facile way to achieve ultra-high quantum yield through the formation of CsPbBr 3 /Cs 4 PbBr 6 heterojunctions .
研究领域:
材料科学
·
纳米技术
·
光电子学
·
光子学
·
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