CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Wenbin Shi,Xiao Zhang,Cong Xie,Hsueh Shih Chen,Ping Yang
To overcome the poor stability of metal halide perovskite nanocrystals (NCs) prepared in organic solvents, a solid reaction method at high temperature was developed using sol–gel porous SiO 2 as a reactor. Sol-gel SiO 2 powders were used to encapsulate CsPbX 3 NCs at high temperatures (600–800 °C) in air to get SiO 2 /CsPbX 3 glass by dispersing growth cites in advance and no ligands added. After NaOH etching, a thin dense SiO 2 shell was remained on the surface of CsPbX 3 NCs (named as CsPbX 3 @SiO 2 ).The photoluminescence (PL) quantum yield of the CsPbX 3 @SiO 2 was 86.7 %, in which their PL peak wavelengths were adjusted from 410-707 nm by changing halogen components. The dense SiO 2 shell on CsPbX 3 NCs blocked the connection of CsPbX 3 cores with water and oxygen in the external environment, resulting in CsPbX 3 @SiO 2 revealed extraordinary high stability. After immersing in water for half year, the PL intensity of CsPbX 3 @SiO 2 composites was remained unchanged and the composites still revealed bright PL after heat-treating in boiling water for 14 h. These highly stable composites were used to fabricate a white light-emitting diode, in which the color coordinates are located at (0.36, 0.33), and the color temperature reaches 5169 K which belongs to the warm white light range.
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Laser & Photonics Reviews
·
2024
·
IF 9.8
Xin Liu,Guangming Niu,Jutao Jiang,Li Che,Laizhi Sui,Xiaowei Wang,Xiangyu Zeng,Guorong Wu,Kaijun Yuan,Xueming Yang
Lead-free halide double perovskites (DPs) have attracted much attention due to their potential applications in the field of near-infrared (NIR) optoelectronics. However, regulating the NIR luminescence properties of such materials remains a challenge. In this study, it is found that Cs 2 AgInCl 6 :Cr 3+ DPs exhibit a broad NIR emission under ultraviolet excitation, with a peak value of 980 nm. In the range of 9 GPa, the emission intensity increases significantly. As the pressure increases, a transition from broadband NIR emission to narrow-line emission occurs, accompanied by a decrease in the full width at half maximum (FWHM) from 260 to 40 nm, attributed to increased local structural asymmetry and enhanced crystal field around Cr 3+ ions. Ultrafast transient absorption experiments reveal the changes of energy transfer under pressure and the emergence of new radiation channels, demonstrating the dynamic evolution of emission characteristics under high pressure. The research results deepen the understanding of high pressure luminescence in Cr 3 ⁺-doped halide DPs, providing strategies for designing highly efficient NIR emitters in metal halide DPs.
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Journal of Materials Chemistry A
·
2024
·
IF 10.7
Wei Guo,Zheng Zhang,Nian Li,Min Xi,Cui Liu,Shudong Zhang,Zhenyang Wang
Transparent materials accompanying ultraviolet and near-infrared (UV/NIR) shielding play a crucial role in sunlight management and are desirable for reducing energy consumption in buildings. Herein, a hollow flower-like core–shell hybrid, in which hollow TiO2 spherical cores are bonded with a CsxWO3 hierarchical nanosheet shell (h-TiO2@CsxWO3 hybrid), is prepared for high-efficiency absorption of UV/NIR light and corresponding transparent membrane-based UV/NIR light shielding for thermal management. Impressively, while maintaining high visible light transmission, the h-TiO2@CsxWO3 flower-like hybrids display the almost complete absorption of UV and NIR light caused by the multilevel synergistic scattering and absorption of incident light between the components. Next, to expand the application of building energy conservation engineering, the h-TiO2@CsxWO3 flower-like hybrids are spray-coated onto the surface of a PET film to serve as the membrane material, showing nearly 80% visible light transmission and complete shielding from UV and NIR light. As a proof of concept, based on the UV/NIR light absorbing shield strategy for thermal management, by transferring the as-prepared h-TiO2@CsxWO3/PET functional membrane as “window glass” on a home-made house model, a temperature reduction of ∼16.4 °C could be achieved relative to a blank house under 1 sun irradiation. Further, outdoor testing (Hefei, China) with simulated room temperatures below ∼25 °C throughout a full day's test cycle achieved a sub-ambient cooling temperature of ∼11.5 °C. Thus, both the solar radiation shielding capability and the combined outdoor service performance significantly advance the UV/NIR shielding strategy for real-world solar/thermal-management applications.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
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IF 19
Lin Cheng,Si-Yu Li,Yu-Jie Zhang,Xin Meng,Ying Wang,Shuaihua Wang,Kai-Yao Wang
Innovation of 137 Cs + and 90 Sr 2+ ion exchangers is achieved through heteroatom-bridged integration of polyoxovanadate clusters, whose soft Lewis basic nature and large size promote the selective capture of cesium/strontium radionuclides. The radiolytically stable Na 6 P 4 V 10 O 34 ·19H 2 O ( VPO-1 ) features an interlinkage of {NaV 10 O 26 } clusters and phosphorus bridges, forming nanoscale voids with hydration-lubricated sodium ions. This structure endows VPO-1 with remarkable exchange kinetics ( k 2 Cs = 3.774 g mg −1 min −1 ; k 2 Sr = 1.376 g mg −1 min −1 ), equilibrium removal ( R > 99.3% within 5–10 min), and maximum capacities ( q m Cs = 300.32 mg g −1 ; q m Sr = 113.00 mg g −1 ). The exchange mechanism is illuminated through single-crystal XRD by revealing cluster-vacancy pathways and ionic-radius-dependent adsorption sites. VPO-1 exhibits stability across pH = 3–12, with exceptional K d Cs and K d Sr values above 10 5 mL g −1 , and high selectivity for Cs + and Sr 2+ over various competing ions. These properties enable excellent column filtration performance ( R = 99%–100%) for mixed Cs + and Sr 2+ during a 3000 mL test. Deep cleaning of these ions is also possible via suction filtration using an ultra-thin VPO-1 /PTFE membrane, with high exchange activity ( R = 98.8%–99.9%) retained after simple regeneration with 2 m NaCl, offering significant potential for nuclear wastewater treatment applications.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Mengru Geng,Jiaqi Zhao,Jie Li,Boyue Liu,Ruiming Liu,Xiaojuan Wang,Wanlong Song,Mingzhe Shao,Yihao Luan,Qun Li,Meng Gao,Fengshan Zhang,Xiaosen Pan,Ning Ma,Guigan Fang
Hydrophilic cellulosic materials exhibit extraordinary effectiveness on sensitivity of humidity. However, the fibril network in fiber walls hinders both permeability and desorption of water, resulting in to weak their responsiveness and recoverability to humidity. Here, structural optimization is achieved by modulating interfacial bonding, resulting in an unprecedented increment in the response-recovery speed of cellulosic humidity sensors. Precisely, hydrolyzable thiol silane is introduced between cellulose nanofibers and carbon nanotubes for a covalent interface, which promotes a dense structure under evaporation induction (76.33 % reduction in thickness), avoiding the deep penetration of water. In addition, Cs 2 SnCl 6 perovskites are loaded by means of strong coordination to boost the chemical dissociation of water molecules, further enhancing the responsiveness and sensitivity of devices. The as-prepared sensor exhibits excellent response/recovery speed (1.8 s / 2.9 s) between 11 % RH to 95 % RH, which is ahead of cellulosic humidity sensors developed in the past three years, as well as satisfactory sensitivity (5.35 × 10 6 %), hysteresis (< 1 % RH), and stability (over 90 days). For application purposes, skin moisture, breathing patterns, and word syllables can be accurately identified. Moreover, it can monitor respiratory rate and amplitude stably during long-term exercise, indicating remarkable potential in human physiological humidity monitoring.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Sibo Zhao,Hongchen Qiu,Linjing Jing,Yingtong Guo,Mingliang Li,Gang Shao,Bingbing Fan,Hailong Wang,Hongliang Xu,Hongxia Lu
The problem of low stability and high lead content limit the commercial development of halide perovskite . In this paper, the high-energy ball milling is used to rapidly and efficiently synthesize high-entropy Cs(Pb 1/5 Mn 1/5 Ni 1/5 Zn 1/5 Yb 1/5 )Cl 3 quantum dots (QDs), the introduction of high-entropy and rare earth ions reduces lead content, increases mixing entropy, and synergistically enhances the photoluminescence (PL) intensity and stability of QDs with other ions. Because the increase of entropy enhances the stability, the QDs still have 70 % PL intensity after 60 days of placement. After the QDs are exposed to the ultraviolet lamp for 8 hours, the PL intensity maintains at 67.1 % due to the loss of ligand. Ionic bonds are easily broken in water, so after soaking in water for 8 hours, the PL intensity of the QDs keeps at 32 %. The thermal stability of QDs is maintained well because of physical and chemical stability of rare earth ions. Since ethanol dissolves the ligands on the surface of the QDs, the non-radiative recombination is enhanced, so the PL intensity of QDs remains at 59 % after soaking for 8 hours. This paper provides a new way that further enhances the stability and solves high lead content of all-inorganic perovskite materials.
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CRYSTENGCOMM
·
2025
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IF 2.6
Siyu Li,Jiali Yao,Dayang Wang,Keke Huang,Wensheng Yang,Renguo Xie
Metal halides (MHs), specifically CsPbX3 (where X = Cl and Br), have garnered significant research interest due to excellent optoelectronic properties. However, most of these metal halides exhibit no red emission in the visible region. In this study, Cs2ZnCl4 powders in the presence of hydrochloric acid were synthesized through mechanical milling. X-ray diffraction (XRD) analyses revealed no detectable diffraction signals before or after acid treatment, suggesting a uniform crystal structure. The initial Cs2ZnCl4 powders displayed intrinsic blue emission centered at 486 nm, with a Photoluminescence Quantum Yield (PLQY) of approximately 5.07%. In contrast, the hydrochloric acid-treated Cs2ZnCl4 powder exhibited bright red emission centered at 645 nm, with a PLQY of about 12.78%. The broad emission, characterized by a full width at half maximum (FWHM) of 135 nm, was attributed to self-trapped exciton (STE) emission. X-ray photoelectron spectroscopy (XPS) analysis of Cs2ZnCl4 before and after acid treatment suggests that hydrochloric acid introduction may have induced distortions or defects in the coordination environment of Zn2+ ions. This provides a valuable route for further investigation into the optical properties of other metal halides.
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Materials Today Chemistry
·
2024
·
IF 6.7
Minghui Lu,Xiaodong Shen,Bao Ke,Tao Huang,Ou Xu,Linghang Kong,Xianci Zhong,Bingsuo Zou
Manganese halides , as dilute magnetic semiconductor materials , have magnetic coupling interactions that play an essential role in their photoluminescence (PL); however, such interactions remain controversial. A MnCl 3 ( A MC, A = K, Rb, and Cs) and their hydrates A MnCl 3 ·2H 2 O ( A MCH, A = K, Rb, and Cs) are both in the ABX 3 configuration but exhibit a wide variety of structures with different connectivity types and dimensions. Their magnetic coupling interaction has been demonstrated. However, few studies have systematically investigated the PL in conjunction with the magnetic coupling interaction over these chloride compounds. In this paper, the effect of the magnetic coupling interaction on A MC and A MCH PL is mainly revealed by temperature-dependent PL spectra and lifetimes. The Mn X 6 ( X 6 = Cl 4 (H 2 O) 2 or Cl 6 ) cluster connection types affect the Mn 2+ –Mn 2+ distances. The magnetic coupling interaction between Mn X 6 octahedrons affects the radiative transitions of manganese chlorides, which is influenced by the Mn 2+ –Mn 2+ distance, local symmetry, and water ligand. The Mn 2+ –Mn 2+ distance and the magnetic coupling interaction also affect their lifetimes. Variations in magnetic coupling interactions can shift emission wavelength , especially dual-emissions and near-infrared (NIR) emission at lower temperatures while A + = K + . This work helps researchers understand the optical process of Mn 2+ ions in different manganese compounds and provides new insights into the design of tailored Mn 2+ ion phosphors.
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Journal of Materials Chemistry C
·
2024
·
IF 5.7
Yongrun Dong,Wen Li,Tao Huang,Shuaigang Ge,Linghang Kong,Chuang Ning,Zequan Li,Wei Gao,Bingsuo Zou
Recently, lead-free double perovskites have been regarded as a promising alternative to lead halide perovskites due to their wide emission band, and environmental protection and stability properties, and are expected to become a series of rising star materials in the lighting field. However, currently, the growth of most lead-free double perovskites occurs in the strong acid environment, which not only brings high cost and environment risk, but also makes it hard to realize large-scale applications with powder products. Herein, we apply a strategy of in situ synthesis of lead-free double perovskites in a polymer matrix by using a small amount of precursors and relatively friendly DMSO solvent to obtain efficiently luminescent Sb3+/Mn2+ co-doped Cs2KInCl6/PVDF composite films in a large-area. The co-doping of Mn2+/Sb3+ into this inorganic double perovskite matrix makes microcrystals with good crystallinity and size distribution in this polymer. The as prepared co-doping composite film with Mn/Sb feeding ratio 16 : 1 shows the brightest white light emission under 320 nm excitation, with a photoluminescence quantum yield (PLQY) as high as 86.98%. The energy transfer (E-T) from the charge-transfer band to the triplet self-trapped exciton (STE) around Sb3+ and then to the ferromagnetic (FM) coupled Mn2+ pair 3d state was confirmed by the temperature-dependent PL spectra and density functional theory calculations. Finally, a single-compound white light emitting diode with chromatic coordinates of (0.31, 0.33) and fluorescent anti-counterfeiting labels could be fabricated based on this composite film with the best white emission. This work provides a new strategy for the application of lead-free double perovskites in the fields of lighting and anti-counterfeiting.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Wen Li,Yongrun Dong,Ting Xie,Tongzhou Li,Chuang Ning,Tao Huang,Zequan Li,Wei Gao,Bingsuo Zou
Lead-free double perovskites (DPs) have superior phase stability and optical properties, which make them competitive for future applications in illumination and displays. However, the preparation of DPs was mainly based on high-temperature heating and hydrochloric acid as a solvent to form powders, which increased the risk and cost of the preparation process and limited its further application. In this study, the growth of Cs2NaInCl6: Sb3+ DPs in polyvinylidene difluoride (PVDF) films was achieved using an in situ fabrication strategy with DMSO as the solvent. The prepared Cs2NaInCl6: Sb3+@PVDF composite films (CFs) can achieve a bright blue emission under 302 nm irradiation. To achieve the optimal luminescent performance of CFs, the photoluminescence (PL) intensity of Cs2NaInCl6: Sb3+@PVDF CFs under various in situ preparation conditions was compared. In addition, the photoluminescence quantum yield (PLQY) of CFs was increased from 0.72% to 83.77% by adjusting the doping amount of Sb3+, and the fluorescence lifetimes t1 and t2 were 131.08 and 1048.52 ns, respectively. Temperature-dependent PL spectroscopy and density functional theory (DFT) calculations indicate that these excellent optical properties are derived from the self-trapped excitons (STEs) at the [SbCl6]3– octahedron and [InCl6]3– octahedron connected via Cl–Na–Cl. The CFs also demonstrated excellent environmental stability, maintaining a relatively stable PL intensity even under conditions of water immersion, high temperatures, and ultraviolet (UV) radiation. Finally, we used the CFs to assemble a blue light-emitting device (LED), which showed good and stable blue emission performance at different currents. This work can provide a new idea for preparing DPs, which is conducive to promoting their commercial application in high-performance optoelectronic devices.
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Journal of Materials Chemistry C
·
2024
·
IF 5.7
Junnan Wang,Zeyu Wang,Nikolai V. Gaponenko,Jindou Shi,Zheyuan Da,Chen Zhang,Yongqiang Ji,Qing Yao,Youlong Xu,Minqiang Wang
X-ray imaging technology has been integral to numerous aspects of people's lives since its inception. With the growing demand for advanced imaging technologies, lead-free metal halide perovskites have received significant attention due to their non-toxicity, stability, and excellent optical properties. This paper investigates the scintillation behaviour of a Te doped Cs2SnCl6 scintillator composite film (CF) prepared through an innovative in situ growth strategy. This approach achieves the direct growth of Cs2SnCl6:Te micro-crystals within polymethyl methacrylate (PMMA), mitigating the issues of optical property degradation and inhomogeneous distribution that are inevitable in a conventional two-step mixing method. By controllable optimization of the doping ratio of Te, the Cs2SnCl6:Te/PMMA CFs exhibited exceptional scintillation properties under X-ray irradiation, with the detection limit reaching up to 112 nGyairs−1. In X-ray imaging applications, the Cs2SnCl6:Te 15%/PMMA CF demonstrated advanced sensitivity, producing high-resolution structural images of the target object. This advancement highlights the promising potential of lead-free metal halide perovskites in the development and application of X-ray imaging technology.
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Polymers
·
2024
·Vol. 16
·期 11
·1568
·
IF 4.7
Yinbiao Shi,Xiaojia Su,Xiaoyan Wang,Mingye Ding
Inorganic CsPbX3(X = Cl, Br, I) perovskite quantum dots (PQDs) have attracted widespread attention due to their excellent optical properties and extensive application prospects. However, their inherent structural instability significantly hinders their practical application despite their outstanding optical performance. To enhance stability, an in situ electrospinning strategy was used to synthesize CsPbX3/polyacrylonitrile composite nanofibers. By optimizing process parameters (e.g., halide ratio, electrospinning voltage, and heat treatment temperature), all-inorganic CsPbX3PQDs have been successfully grown in a polyacrylonitrile (PAN) matrix. During the electrospinning process, the rapid solidification of electrospun fibers not only effectively constrained the formation of large-sized PQDs but also provided effective physical protection for PQDs, resulting in the improvement in the water stability of PQDs by minimizing external environmental interference. Even after storage in water for over 100 days, the PQDs maintained approximately 93.5% of their photoluminescence intensity. Through the adjustment of halogen elements, the as-obtained composite nanofibers exhibited color-tunable luminescence in the visible light region, and based on this, a series of multicolor anti-counterfeiting patterns were fabricated. Additionally, benefiting from the excellent water stability and optical performance, the CsPbBr3/PAN composite film was combined with red-emitting K2SiF6:Mn4+(KSF) on a blue LED (460 nm), producing a stable and efficient WLED device with a color temperature of around 6000 K and CIE coordinates of (0.318, 0.322). These results provide a general approach to synthesizing PQDs/polymer nanocomposites with excellent water stability and multicolor emission, thereby promoting their practical applications in multifunctional optoelectronic devices and advanced anti-counterfeiting.
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