Advanced Optical Materials
·
2026
·
IF 7.2
Cheng Liu,Yiwei Zhang,Rui Cao,Yin Xiao
We report a vacancy-mediated, chiral-ligand-assisted strategy for synthesizing chiral CsPbBr 3 perovskite nanorods with strong circularly polarized luminescence (CPL) and high photoluminescence quantum yield (PLQY). The method involves the formation of a bromide-vacancy-rich FAPbBr 3 shell on ultra-small CsPbBr 3 nanocrystals, followed by the introduction of R/S -PEABr, where Br − ions mediate electrostatic assembly and promote anisotropic regrowth into nanorods. Chiral R/S -MBA + ligands simultaneously cap the nanorod surfaces, regulating growth and inducing chirality. The resulting nanorods exhibit a PLQY of 91%, and a maximum dissymmetry factor (| g lum |) of 2.2 × 10 −3 is obtained in the film state. When used as the emissive layer in circularly polarized light-emitting diodes (CP-LEDs), the devices demonstrate electroluminescence centered at 498 nm, a maximum luminance of 436.7 cd/m 2 , an external quantum efficiency of 2.7%, and a maximum circular polarization of | g CP-EL | = 2.5 × 10 −4 . This work advances the controlled synthesis of chiral perovskite nanostructures and highlights their potential for high-performance chiral optoelectronic applications.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Yi Zhu,Siyu Qin,Haohan Hu,Shu Nie,Xiangyi Bai,Yulong Zhao,Xiuquan Gu
Perovskite nanocrystals (NCs) are promising color converters for displays but are limited by defect-related inefficiency and instability. To address this, a one-pot synthesis is developed in which ZnO NCs and oleic acid first form stable zinc oleate complexes that anchor onto the surface of CsPbBr 3 NCs, thereby creating a stable organic-inorganic ligand shell, which suppresses degradation and Ostwald ripening during processing. Theoretical calculations confirm that the introduction of ZnO enhances the stability of NCs by raising the formation energy and suppressing defect generation. Consequently, photoluminescence quantum yield (PLQY) is boosted to 97%, representing a dramatic increase from the 32.4% value of pristine CsPbBr 3 NCs. Employing these high-performance NCs, a white light-emitting diode (WLED) was fabricated by integrating the composite film with a blue LED chip. More importantly, the NC-based composite films demonstrate robust stability under thermal, aqueous, and optical stresses, retaining > 70% of their initial PL intensity—significantly outperforming control samples (<30%). This WLED exhibits a wide color gamut, covering 129.8% of the NTSC standard and 96.9% of Rec. 2020. Subsequently, a WLED array backlight unit was fabricated and subsequently integrated into a prototype display. This work establishes the practical potential of ZnO-incorporated CsPbBr 3 NCs as efficient and stable color-conversion materials, thereby paving the way for advancing high-performance backlit display technology.
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Small
·
2026
·
IF 11.8
Jiahui Chen,Xianglong Wei,Siyin Hu,Jianing He,Zhenjie Huang,Shan-Ci Chen,Mei-Jin Lin,Huanghao Yang
Hybrid perovskite materials have recently emerged as a promising candidate in radiation detection research due to their superior charge carrier mobility and lower trap-state density. While most perovskite X-ray detectors typically rely on external bias for charge collection, the growing demand for efficient and energy-saving perovskite X-ray detectors has spurred extensive interest in self-powered devices, which offer high-performance, low power consumption, and enhanced portability. To date, most high-performance self-powered X-ray detectors rely on secondary crystal growth via post-deposition immersion in saturated solutions. Herein, we report a facile additive engineering strategy employing 4-trifluoromethyphenylammonium iodide (CF 3 PhAI) to modulate perovskite crystallization, enabling single-step fabrication of microcrystalline CsPbBr 3 films with grain sizes up to 38.6 µm. This approach effectively passivates defects and suppresses ion migration in CsPbBr 3 , reducing dark current drift by nearly two orders of magnitude from 4.135 × 10 −12 to 4.167 × 10 −14 A s −1 . Moreover, the incorporation of a low-work-function aluminum (Al) top electrode significantly enhances the built-in electric field, yielding a remarkable zero-bias sensitivity of 1.3 × 10 3 µC Gy air −1 cm −2 . This work accelerates the development of high-performance self-powered perovskite X-ray detectors toward practical applications.
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SOLAR ENERGY
·
2026
·
IF 7.9
Qixin Chen,Zhongchen Bai,Xu Wang,Xinghua Li,Min Feng,Zhengping Zhang
An ultrathin Mg-doped SnO 2 layer reconstructs the ETL surface. • SnO 2 /Mg-doped SnO 2 bilayer regulates the ETL/CsPbBr 3 interface. • Improved morphology and charge transport enhance device performance. • The optimized device achieves 8.74% PCE and 90.69% retention after 50 days. Incomplete surface coverage, localized exposure of ITO protrusions, and interfacial nonuniformity in solution-processed SnO 2 electron transport layers (ETLs) restrict the performance of hole-transport-layer-free (HTL-free) CsPbBr 3 perovskite solar cells (PSCs). Herein, a planar homojunction SnO 2 /Mg-doped SnO 2 bilayer ETL was fabricated by depositing an ultrathin Mg-doped SnO 2 layer on the SnO 2 surface to regulate the ETL/perovskite interface in an ITO/SnO 2 /CsPbBr 3 /carbon device architecture. This bilayer configuration improves surface coverage, interfacial contact, and energy-level alignment while preserving lattice compatibility within the SnO 2 -based system. The Mg-doped SnO 2 top layer reduces surface cracks and pits, limits local ITO exposure, decreases roughness, and improves precursor wettability. These changes promote the formation of CsPbBr 3 films with larger grains, fewer pinholes, better vertical morphology, higher crystallinity, and a near-stoichiometric composition. The PL, TRPL, EIS, dark J–V, XPS, and UPS results collectively indicate improved interfacial charge extraction, reduced defect-assisted non-radiative recombination, and more improved energy-level alignment at the ETL/perovskite interface. Consequently, the optimized HTL-free device achieved a champion PCE of 8.74% with a Voc of 1.520 V and retained 90.69% of its initial efficiency after 50 days of unencapsulated storage in air. This work indicates that introducing an ultrathin Mg-doped SnO 2 overlayer effectively reconstructs the ETL surface and regulates the ETL/perovskite interface, providing an effective interfacial regulation strategy for developing efficient and stable HTL-free all-inorganic PSCs.
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Journal of Physical Chemistry C
·
2026
·
IF 3.4
Lu Tian,Zhen Zhang,Jing Li,Hao Wu,Baili Li,Dongli Yin,Yuan Ren,Zhipeng Li
Conventional methods for phase structure tuning and sizing of CsPbBr3 quantum dots (QDs) usually involve multistep procedures and are susceptible to impurity contamination. In this study, we propose a simplified thermal injection strategy that can simultaneously control the crystal size (8.9 to 17.5 nm) and phase transition as well as maintain high crystallinity by precisely adjusting the Cs+ concentration. Notably, a systematic increase in Cs+ content induces a reversible monoclinic-cubic-monoclinic phase transition with tunable quantum confinement effects. Comprehensive characterization results show that the luminescence wavelength could be tuned from 510 to 524 nm (blue-green color illumination), while the cubic-phase CsPbBr3 QDs possess the highest luminescence peak intensities, with photoluminescence quantum yields as high as 74.84% and extended exciton lifetimes (43.12 ns) due to the reduction of surface defects. The optimized cubic phase features a narrow size distribution (σ = 9.9%), high color purity (CCT = 10,575 K), and enhanced emission intensity, which are directly related to its symmetric crystal structure. The carrier dynamics during photoexcitation were also studied by using femtosecond transient absorption spectroscopy. The luminescent dot array was also well prepared through a dispensing process. The above results show that our simple method is helpful in the large-scale production of high-quality perovskite quantum dots for applications in display.
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高影响因子
IEEE TRANSACTIONS ON ELECTRON DEVICES
·
2026
·
IF 3.6
Bao Xiao,Yuquan Wang,Haoming Qin,Wenjie Chen,Xuchang He,Jun Du,Nannan Shen,Qihao Sun,Yihui He
Perovskite CsPbBr3 has emerged as a promising room-temperature semiconductor radiation detector, synthesizable via both melt- and solution-growth methods. Herein, we systematically compare the $\gamma $ -ray detection performance of CsPbBr3 crystals grown by inverse temperature crystallization (ITC) and vertical Bridgman (VB) method. ITC-grown crystals exhibit relatively low optical transmittance of ~65%, a short photoluminescence (PL) lifetime of ~6.07 ns, moderate resistivity of $6.06\times 10^{{9}}~\Omega {\cdot }\text {cm}$ , and a limited on–off ratio of ~350. In contrast, VB-grown crystals show markedly improved optoelectronic properties, including higher transmittance (75%~80%), a much longer PL lifetime (~36.75 ns), higher resistivity ( $1.08\times 10^{{10}}~\Omega {\cdot }\text {cm}$ ), and a significantly enhanced on–off ratio (~5300). These improvements indicate higher crystal quality and reduced defect density in VB-grown CsPbBr3 crystals, leading to more efficient charge transport. Notably, the average hole mobility and mobility-lifetime product increase from 5.36 cm ${}^{{2}}{\cdot }\text {V}^{-{1}}{\cdot }\text {s}^{-{1}}$ and $4.45\times 10^{-{4}}~\text {cm}^{{2}}{\cdot }\text {V}^{-{1}}$ to 24.87 cm ${}^{{2}}{\cdot }\text {V}^{-{1}}{\cdot }\text {s}^{-{1}}$ and $3.58\times 10^{-{3}}~\text {cm}^{2}{\cdot }\text {V}^{-{1}}$ , respectively. Accordingly, asymmetric Au/CsPbBr3/EGaIn detectors fabricated from VB-grown crystals deliver excellent average energy resolutions (ERs) of ~9.8% and ~5.5% for 241Am and 57Co $\gamma $ -ray sources, respectively, along with superior detector uniformity, whereas ITC-based detectors exhibit only moderate ERs of ~29.6% and ~22.6%. These results suggest that melt-grown CsPbBr3 crystals are more favorable for high-performance $\gamma $ -ray detectors applications.
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Journal of Physical Chemistry C
·
2019
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IF 4.309
Zhuang Zhao,Manyi Zhong,Weichang Zhou,Yuehua Peng,Yanling Yin,Dongsheng Tang,Bingsuo Zou
CsPbX3 perovskites have attracted tremendous attention recently due to their excellent optical properties and potential applications. However, this seemingly counterintuitive fact that CsPbX3 perovskites can act as both extraordinary photovoltaic materials and superior emission mediums has not yet been well understood. In this work, the absorption spectrum, temperature-dependent Raman spectra, temperature- and excitation power-dependent steady-state micro-photoluminescence along with the temperature-dependent emission lifetime dynamics were used to characterize systematically the luminescence processes of solution-grown CsPbBr3 micro/nanowires with weak confinement. A dominative in situ triplet exciton emission at 527 nm with strong exciton–phonon coupling and a series of end-facet cavity-related emission bands in the range of 535–580 nm due to robust exciton–photon coupling were observed simultaneously in individual nanowires. The in situ triplet exciton luminescence shows an abnormal blue shift with increasing temperature, while the end-facet emission bands exhibit a red shift. The exciton binding energy and exciton–phonon coupling energy were extracted to be 57 and 66 meV, respectively, confirming the strong exciton–phonon coupling. Our results could provide new insight into the long-standing issue of intrinsic excitonic properties as well as the photophysical process and exciton–phonon/exciton–photon coupling in CsPbBr3 micro/nanostructures, which are critical and helpful to the development of high-performance optoelectronic devices.
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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
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无机化学
·
钙钛矿材料合成
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高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 2
·355
·
IF 5.3
Longshi Rao,Bin Sun,Yang Liu,Guisheng Zhong,Mingfu Wen,Jiayang Zhang,Ting Fu,Shuangxi Wang,Fengtao Wang,Xiaodong Niu
Inorganic lead halide perovskite is one of the most excellent fluorescent materials, and it plays an essential role in high-definition display and visible light communication (VLC). Its photochromic properties and stability determine the final performance of light-emitting devices. However, efficiently synthesizing perovskite with high quality and stability remains a significant challenge. Here, we develop a facile and environmentally friendly method for preparing high-stability and strong-emission CsPbBr3/Cs4PbBr6composites using ultrasonication and liquid paraffin. Tuning the contents of liquid paraffin, bright-emission CsPbBr3/Cs4PbBr6composite powders with a maximum PLQY of 74% were achieved. Thanks to the protection of the Cs4PbBr6matrix and liquid paraffin, the photostability, thermostability, and polar solvent stability of CsPbBr3/Cs4PbBr6-LP are significantly improved compared to CsPbBr3quantum dots and CsPbBr3/Cs4PbBr6composites that were prepared without liquid paraffin. Moreover, the fabricated CsPbBr3/Cs4PbBr6-LP-based WLEDs show excellent luminescent performance with a power efficiency of 129.5 lm/W and a wide color gamut, with 121% of the NTSC and 94% of the Rec. 2020, demonstrating a promising candidate for displays. In addition, the CsPbBr3/Cs4PbBr6-LP-based WLEDs were also demonstrated in a VLC system. The results suggested the great potential of these high-performance WLEDs as an excitation light source to achieve VLC.Keywords:ultrasonication;liquid paraffin;CsPbBr3/Cs4PbBr6;white-light-emitting diodes;visible light communication
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yijie Wang,Hougang Fan,Xiaoyan Liu,Jian Cao,Huilian Liu,Xin Li,Lili Yang,Maobin Wei
Efficient electron transfer process and excellent CO 2 adsorption capacity are of great significance for improving CO 2 photoreduction efficiency. 3 D– 0 D ZnO/CsPbBr 3 S-scheme heterojunction hollow spheres were successfully prepared via a simple self-assembled process for efficient CO 2 photoreduction. Photocatalytic CO 2 reduction experiments showed that the ZnO/CsPbBr 3 had the excellent CO 2 photocatalytic conversion activity to CO, which was about 2.61 times higher than that of ZnO hollow micro-spheres and 1.9 times higher than that of pure CsPbBr 3 quantum dots (QDs). Photoelectrochemical characterization confirmed that the ZnO/CsPbBr 3 composite had good photoelectric conversion ability and carrier transfer ability, which was beneficial to the photocatalytic reaction. The suitable band gap structure and DFT calculation results showed that the formation of built-in electric field at the ZnO/CsPbBr 3 interface can greatly improve the S-scheme electron transfer ability, which can foster the CO 2 photoreduction. Besides, the introduction of 3D structure can improve the dispersion of CsPbBr 3 QDs and effectively enhance the CO 2 capture ability of the catalyst, which greatly promoted the CO 2 photoreduction reaction. The current work can present a novel S-scheme photocatalyst , which is looked forward to providing a certain perception into the advance of novel highly efficient CsPbBr 3 QDs-based photocatalysts for CO 2 resource utilization.
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Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 10
·3729-3737
·
IF 8.067
Yi Huang,Pengfei Tang,Wenxia Zhang,Wensheng Yan,Bin Liu,Xiaosheng Tang,Zhen Wang,Yue Peng,Weiwei Chen
Metal halide perovskite quantum dots (QDs) are emerging as promising materials for illumination and display applications owing to their unique optical and electronic properties. However, research into the doping of perovskite QDs with alkali metal cations for use in light-emitting diode (LED) devices is limited. Herein, a facile and convenient room-temperature method for synthesizing Na+-ion-doped CsPbBr3 QDs is presented. Through the optimization of the Na+ doping concentration, the as-prepared Na+-doped CsPbBr3 QDs display a higher photoluminescence quantum yield of 94.74%, faster radiative recombination rate of 30.4 μs−1, and longer lifetime of 31.2 ns than their undoped counterparts, allowing the practical realization of high-efficiency electroluminescent QD LED (QLED) devices. As a result, a maximum luminance of 20 190 cd m−2, a peak current efficiency of 34.5 cd A−1, and an external quantum efficiency of 8.97% for as-fabricated QLEDs are obtained; all these characteristics are higher than those of the control device with undoped CsPbBr3 QDs. Experimental studies combined with auxiliary theoretical calculations indicate that the enhanced performance can be chiefly attributed to the decreased trap defect density of the perovskite upon sodium incorporation. This research indicates the immense potential of the Na+-doped CsPbBr3 QDs to act as an emission layer for use in the next-generation illumination and display fields.
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