ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Sihan Yang,Changshuai Gong,Ziying Wang,Liang Dong,Xuejiao Wang,Ji-Guang Li
To overcome the problem of severe thermal quenching (TQ) of near-infrared (NIR) phosphors, the NIR phosphor with antithermal quenching performance is urgently needed. In this work, a negative thermal expansion (NTE) material Yb2–2xCr2xW3O12 was prepared. Through a comprehensive analysis involving in situ X-ray diffractometer (XRD), thermogravimetry (TG), and Rietveld refinement, it was concluded that, at room temperature, the sample adopts a trihydrate orthorhombic structure (Yb2W3O12·3H2O) and does not exhibit negative thermal expansion (NTE) behavior. However, after dehydration at 373 K, anhydrous orthorhombic Yb2W3O12 (space group Pbcn), which exhibits obvious NTE properties, was obtained. The underlying mechanism is that when water molecules enter the crystal and occupy vacancies, the Yb–O–W bonds bend, restricting the transverse thermal vibrations of the Yb–O–W bonds. The characteristic emission of Yb3+ within the range of 800–1300 nm was observed under 468 nm blue light irradiation due to the efficient energy transfer from Cr3+ → Yb3+. Remarkably, the prepared NIR phosphor has antithermal quenching performance, and at 398 K, the intensity of the strongest emission can maintain 1.89 times that of the room temperature, surpassing most NIR phosphors. The antithermal quenching phenomenon is attributed to cell contraction, which reduces the distance between the sensitizer and activator, thereby enhancing the energy transfer efficiency and increasing the luminous intensity. The combination of 460 nm excitable strong NIR emission and antithermal quenching suggests potential application in biomedical imaging and infrared night vision technologies. The NIR pc-LED device, prepared by coating the Yb1.94Cr0.06W3O12 phosphor on a commercial 460 nm chip, demonstrated a high optoelectronic efficiency and high output power, making it well-suited for night vision applications. Furthermore, the efficient NIR-I/II emission from Yb1.94Cr0.06W3O12 was proved to be highly effective for compositional analysis. This study offers valuable insights for designing NIR phosphors with excellent thermal quenching resistance.
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高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Yuhuan Tan,Yiran Yang,Shiyan Li,Zixiong Yao,Shixun Lian,Pengyan Fu,Wenli Zhou
To address issues such as uneven particle size, agglomeration, low luminescence efficiency, and poor stability in the nanosizing of Mn4+-doped fluoride red phosphors, this study combines solid solution engineering and aliovalent charge compensation to prepare high-performance K2LiB1–xB′xF6:Mn4+ (B, B′ = Al, Ga, In) nanoparticles (FNPs). Using an HF-free coprecipitation method for the synthesis of solid-solution matrices, followed by a ligand-assisted reprecipitation step that employs a small amount of HF to dissolve K2MnF6 to rapidly and uniformly incorporate Mn4+ into the matrices, and the particle size is reduced from 33.32 to 16.05 nm with improved dispersibility by adjusting the volume ratio of oleic acid (OA) to oleylamine (OAm) ligands; through the gradual solid solution of Al3+, Ga3+, and In3+, the regulatory mechanism of lattice distortion and local crystal field on luminescence is revealed, with optimal luminescence intensity achieved at specific solid-solution ratios and the emission peak blue-shifted from 636 to 632 nm. Zn2+ codoping for charge compensation enhances the luminescence intensity of the 0.9% Mn4+-doped sample by 120%, with the internal quantum efficiency (IQE) increased to 40.01%, and the fluorescence lifetime extended to 4.11 ms. The FNPs have good thermal stability (56% retention at 150 °C) and moisture resistance (85% retention after 240 h in water). Packaged white light-emitting diode (WLED) exhibits a luminous efficacy of 20.54 lm W–1, and the fluorescent ink enables red–green anticounterfeiting display under UV excitation, providing insights into applications in high-end display and lighting fields, especially micro-LED color conversion layers, WLED packaging, and anticounterfeiting/encryption inks.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Dongsheng Chen,Xiangyang Xu,Pengtao Lei,Jianyu Ge,Yuanlin Tong,Chenyu Huang,Xianghui Fu
Morphology control and heterostructure construction are two essential aspects in designing and synthesizing photocatalysts . Herein, hollow microsphere heterojunctions of CeO 2 and Ce 3+ doped BiOBr (Ce-BiOBr) were fabricated adopting a facile one-pot solvothermal approach. Owing to the positively charged Ce species, the interlamellar repulsion can be reduced and the specific surface area of these microsphere can be increased. The as-generated Ce 4+ /Ce 3+ redox centers can synergistically improve the transfer and separation efficiency of photogenerated carriers. When used to treat Congo red (CR), 0.1CBOB with a Ce/Bi molar ratio of 0.1:1 exhibits the best photodegradation efficiency (94.63%) and kinetic rate (0.01119 min −1 ) under visible light-emitting diode (LED) light irradiation , which are remarkably superior to pure BiOBr and CeO 2 . The results of radical capture experiment show that photogenerated hole (h + ), superoxide radical (·O 2 − ) are the main active species in the process of photocatalytic degradation.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Jiliang Ma,Junqiang Zhang,Dongnv Jin,Shuangquan Yao,Runcang Sun
Synchronous photocatalytic water splitting and the reforming of a biomass-derived feedstock to generate hydrogen and high-value-added chemicals make full utilization of the biomass-water-splitting redox reaction; however, limited successes in this regard have been reported. Herein, incompletely polymerized graphitic carbon nitride co-doped with zinc/oxygen atoms (Zn 2 /O@IP- g -CN) was prepared via a step-by-step low-temperature calcination process with the assistance of melamine and zinc phthalocyanine, which successfully resulted in simultaneous photocatalytic water splitting and the reforming of biomass-derived monosaccharides to produce hydrogen (11436.7 μmol g −1 h −1 ) and lactic acid (92.6 %), respectively. Zn 2 /O@IP- g -CN exhibits a fast separation/migration rate and low resistance compared to those of pure CN, resulting in Zn 2 /O@IP- g -CN showing enhanced photocatalytic activity. The hydrogen release rate of 86.8 % and lactic acid yield of 89.0 % were retained compared to initial values when Zn 2 /O@IP- g -CN was reused in 5 th cycles. Poisoning experiments indicated that 1 O 2 , ·O 2 - , ·OH, and h + were all beneficial for lactic acid production.
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ACS Omega
·
2023
·
IF 4.1
Wanru Gao,Yuping Li,Yunping Zhoujin,Qun Zeng,Liwen Fang,Sean Parkin,Tonglei Li,Shigang Ruan,Sihui Long
Four 2-hydroxy-N-alkyl-N-phenyl-nicotinamides (1–4) were synthesized, and their crystal structures were analyzed to investigate the effect of substitution on their crystal packing of N-phenyl-2-hydroxynicotinanilides. In these compounds, substituents were introduced on the amide N, leading to a peptoid-like structure. One solvent-free form and two hydrates were harvested for compound 1, and one anhydrous form and one hydrate were obtained for compound 2. Polymorphism was observed in compounds 3 and 4. The molecules were found to be in the keto form rather than the enol tautomer. Because of steric effects, the molecules took on an E configuration, leading to a hairpin-like geometry. A lactam–lactam dimer synthon was formed in all solvent-free structures, and a tetramer motif was observed for the first time. Dehydration of the two hydrates of 1 and the hydrate of 2 led to their respective solvent-free form. Phase transition between the polymorphs was revealed in compound 3. Theoretical calculations, including conformational energy evaluation, hydrate forming propensity assessment, and lattice energy appraisal, were performed to provide a reasonable explanation for the keto tautomer and the formation of the hydrates of compound 1.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jianxu Wang,Yan Xie,Junlan Guo,Xuemei Yao,Xue Geng,Jing Gao,Xuyao Feng,Zijing Zhou,Yuanyuan Liu,Bin Deng,Ruijin Yu
Novel apatite-type NaCa 3 Bi(PO 4 ) 3 F: x Sm 3+ (0.01 ≤ x ≤ 0.30) orange-red-light phosphors were synthesized through the solid-state method at high temperature. The crystal structure, energy band structure , density of state, phase purity, particle morphology , photoluminescence properties, thermostability, and luminescence decay of the phosphors were comprehensively characterized. When λ ex = 404 nm, the optimal NaCa 3 Bi(PO 4 ) 3 F:0.05 S m 3+ phosphor showed the orange-red emission (597 nm). The NaCa 3 Bi(PO 4 ) 3 F:Sm 3+ phosphors exhibited abnormal thermal quenching properties as their emission intensity increased by about 2.57% from 300 to 380 K. Their intensity at 440 K was still 1.01-fold stronger than that at room temperature. The abnormal thermal quenching mechanisms were well explained via the coordinate configuration scheme. The thermal activation energy ( E a ) was calculated to be 0.79 eV. The color purity of all the phosphors reached 99.9%. Ultimately, a white light-emitting diode (w-LED) was fabricated based on the tri-color RGB method. The color rendering index and the chromaticity coordinates of the fabricated w-LED were 89 and (0.310, 0.319), respectively. Thus, these high thermostability NaCa 3 Bi(PO 4 ) 3 F:Sm 3+ orange-red phosphors can be potentially used in w-LED applications.
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Polymer Chemistry
·
2019
·Vol. 10
·期 29
·3996-4005
·
IF 4.76
Feifei Li,Wanting Yang,Mengmeng Li,Lin Lei
A simple white light-emitting diode (LED) induced controlled radical polymerization (CRP) with an in situ bromine–iodine transformation was successfully conducted via organocatalysts. N,N,N′,N′′,N′-Pentamethyldiethylenetriamine (PMDETA), tributylamine (TBA), and hexamethylphosphoric triamide (HMPA) were employed as organocatalysts in this CRP system due to their green, inexpensive, easy-to-handle and highly reactive features. All the three organocatalysts exhibited high efficiency in this CRP system. The polymer molecular weight and distribution (Mw/Mn = 1.02–1.19) of poly(methyl methacrylate) were satisfactory up to fairly high conversions at room temperatures. Well-defined copolymers demonstrated living features of controlled radical polymerization which also indicated that functional methacrylates were also appropriate for this system. Various solvents were added in this CRP system which widely broadened the applicability. Notably, using PMDETA as an organocatalyst for both in situ bromine–iodine transformation CRP and ring-opening polymerization (ROP), poly(methyl methacrylate)-b-poly(L-lactide) (PMMA-b-PLLA) was successfully synthesized in “one-pot”.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 7
·5615-5622
·
IF 1.798
Chu Yang,Hao Haixia,Xie Hongde,Chen Cuili,Cai Peiqing,Seo Hyo Jin
In this work, we report the preparation of lanthanide (Eu 3+ , Tb 3+ )-complex-grafted copolymer of methyl methacrylate and maleic anhydride films. The lanthanide complex with three amino groups was used to react with poly(methyl methacrylate-co-maleic anhydride) (P(MMA-MAH)) via the amidation method. Fourier transform infrared (FT-IR), Transmission electron microscope (TEM), Scanning electron microscope (SEM), Thermogravimetric analysis (TGA) were employed to characterize those polymers. Luminescent properties were evaluated through conducting Photoluminescence (PL) excitation spectra, emission spectra and fluorescence decay curves measurements. The infrared analysis reveals the amidation between amino groups and anhydride rings. The comparatively uniform morphology can be observed in the images of TEM and SEM. These polymers can emit intense characteristic lights including red light from Eu 3+ ions and green light from Tb 3+ ions under 294 nm excitation. The lifetimes of polymers are short (about 1 ms). Meanwhile, these luminescent polymers exhibit high thermal stability (T 5 > 200 °C). We also stimulate a lamp to illustrate the possible application. All these approved interesting results suggest that they hold significant promising applications as luminous layers for optoelectronic devices.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Muhammad Amin Padhiar,Shaolin Zhang,Fangrong Qin,Minqiang Wang,Yongqiang Ji,Noor Zamin Khan,Nisar Muhammad,Sayed Ali Khan,Jahangeer Ahmed,Shusheng Pan
Lead-free double perovskites (DPs) in the form of two-dimensional (2D) nanosheets (NSs) have emerged as exceptional candidates compared to zero-dimensional (0D) nanocrystals (NCs). This preference is attributed to their intriguing fundamental properties and promising applications in optoelectronics. Notably, NSs offer superior performance due to their enhanced surface passivation capabilities, facilitating more efficient treatment of surface defects and thereby enhancing optoelectronic properties. However, the realization of Cs 2 NaInCl 6 as lead-free DPs NSs is yet to be achieved. In this study, we successfully synthesized Cs 2 NaInCl 6 co-doped with Bi 3+ /Mn 2+ NSs. The two-step solution process synthesis enables us to achieve dimensionality control, progressing from 0D NCs to 2D NSs. Comprehensive optical spectroscopy analyses reveal that the NSs exhibit a suppressed non-radiative decay rate ( Knr ) of 5.03 × 10 −3 ns −1 in contrast to NCs with a Knr of 3.21 × 10 −2 ns −1 . This observation is indicative of a well-passivated surface in NSs. In contrast, NSs with identical composition and surface morphology significantly enhance the photoluminescence quantum yields (PLQYs) up to 73%, which represents the highest PLQYs recorded in Cs 2 NaInCl 6 DPs to the best of our knowledge. Beyond fundamental investigations, the study explores the practical applications of these NSs as anti-counterfeit marks created on a flexible substrate, demonstrating robust emission under UV light. Additionally, the fabrication and testing of a light-emitting diode (LED) showcase the versatility of these NSs in optoelectronic devices. This comprehensive exploration of the optical, morphological, and application aspects of Cs₂NaInCl₆ doped with Bi³⁺/Mn 2 ⁺ NSs contributes valuable insights to the evolving landscape of lead-free perovskite materials, highlighting their potential for diverse technological applications.
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Water Reuse
·
2024
·Vol. 14
·期 3
·342-354
·
IF 4.3
Liu Z.,Xu M. Y.,Yin H.,Xie C. W.,Liu Q.,Liu H. T.,Liang S. Y.,Li J. K.,Zhang T. Y.,Li T.,Hu H. Y.,Xu B.
Membrane fouling is a prominent issue that affects the stable and efficient operation of reverse osmosis (RO) in reused water treatment. In this study, a zero-discharge RO system was adopted to treat the ultrafiltration permeate from a steel plant with the combined multi-wavelength UV-LED/chlorine process, focusing on organic structure modification and membrane fouling control. The results showed that the UV-LED/chlorine process could not only efficiently remove the dissolved organic carbon and the total nitrogen of the RO influent but also alter the organic substances from large molecules to small ones. In addition, the longer wavelength of a 295 nm UV-LED/chlorine process exhibited a greater RO permeate flux of 158 LMH, as compared to the shorter wavelength of 255 nm with the flux of 152 LMH. Moreover, compared to the single-wavelength, the dual-wavelength UV-LED/chlorine process played a more significant role in RO filtration performance, which induced a looser and thinner foulant structure, resulting in an 8% larger permeate flux and recovery at 275 + 295 nm than at 295 nm. This study demonstrated that the combined UV-LED/chlorine process could effectively alleviate RO membrane fouling. Our findings can provide theoretical and technical support for the sustainable development of membrane-based reused water treatment in the steel industry. Multi-wavelength UV-LED/chlorine process was effective for the pretreatment of RO for steel reused water treatment. UV-LED/chlorine process could oxidize organics to enhance RO filtration. Longer wavelength UV-LED/chlorine process was more favorable for organics removal and RO fouling control. Dual-wavelength UV-LED/chlorine pretreatment can induce less RO membrane fouling as compared to single wavelength.
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Laser & Photonics Reviews
·
2021
·Vol. 15
·期 10
·2100278
·
IF 13.138
Qionghua Mo,Chen Chen,Wensi Cai,Shuangyi Zhao,Dongdong Yan,Zhigang Zang
The photoluminescence quantum yield (PLQY) of CsPbBr 3 perovskite nanocrystals (NCs) prepared by the hot-injection method can exceed 90%, which have attracted intensive attention for white light-emitting diodes (WLEDs). However, the whole hot-injection experiment requires air isolation and relatively high temperature. In addition, the poor stability of CsPbBr 3 NCs impedes their applications. Here, a facile method is reported to synthesize CsPbBr 3 @ZrO 2 NCs at room temperature in air. Owing to using ZrO 2 coated CsPbBr 3 NCs, the prepared CsPbBr 3 @ZrO 2 NCs not only present a PLQY of 80% but also exhibit an enhanced stability to heat and moisture. Furthermore, WLEDs are fabricated with CsPbBr 3 @ZrO 2 NCs and commercial red phosphors (CaAlSiN 3 :Eu 2+ ) on blue LEDs chips. The fabricated WLEDs exhibit a correlated color temperature (CCT) of 4743 K and luminous efficacy as high as 64.0 Lm W –1 . In addition, visible light communication with a high data rate of 33.5 Mbps is achieved using the WLEDs. This work provides a room temperature strategy to coat zirconia for CsPbBr 3 @ZrO 2 NCs, benefiting to enhance the optical performance and stability, as well as the promotion of the great potentials in solid-state illuminating and visible light communication applications.
研究领域:
材料科学
·
光学工程
·
纳米技术
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Laser & Photonics Reviews
·
2025
·Vol. 19
·期 12
·2500026
·
IF 10
Yeping Ge,Ming Zhao,Yifei Zhao,Xinping Zhang
Filling the cyan gap (470–500 nm) in white light-emitting diodes (WLEDs) is crucial for full-spectrum illumination. However, the traditional approach of adding cyan phosphor to red, green, and blue phosphors can lead to reabsorption and color aberrations due to spectral overlap and varying degradation rates among the mixed phosphors. Herein, a blue-cyan-emitting phosphor (λ em = 475 nm) is developed through Si 4+ -P 5+ heterovalent substitution in blue-violet-emitting Rb 3 Y(PO 4 ) 2 :Eu 2+ phosphor (λ em = 425 nm), which can serve as the blue component in WLEDs to fill the cyan gap without adding extra phosphor. Initially, Eu 2+ primarily occupy the Rb2O 12 sites (426 nm) in Rb 3 Y(PO 4 ) 2 :Eu 2+ , with minimal occupation in the Rb1O 7 sites (456 nm) and YO 6 sites (522 nm). The Si 4+ -P 5+ substitution results in a red-shift of the Eu 2+ @Rb1 emission peak from 456 to 475 nm and the preferred occupation of the Rb1 sites by Eu 2+ , synergistically achieving the blue-cyan luminescence. Employing the blue-cyan-emitting phosphor instead of the blue-violet-emitting phosphor in WLEDs significantly improves the color rendering index from 90 to 97.2, thus enhancing the overall color reproduction quality. This research demonstrates a facile composition modification method to modulate the properties of inorganic luminescent materials and provides an alternative solution for full-spectrum healthy lighting.
研究领域:
材料科学
·
发光材料
·
固态照明
·
无机化学
·
光电子学
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