Inorganic Chemistry Frontiers
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2025
·Vol. 12
·期 11
·3811-3822
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IF 6.4
Mingkai Wei,Zixi Chen,Yongying Chen,Xinxiang Liang,Na Li,Xuejie Zhang,Wei Li,Haoran Zhang,Maxim S. Molokeev,Bingfu Lei
Broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are considered to be at the forefront of the development of next-generation NIR light sources. However, the performance of NIR pc-LEDs is severely limited due to the narrow band emission, low quantum efficiency, and thermal quenching of NIR-emitting materials. Herein, an efficient and thermally stable broadband NIR LaMgGa11O19:Cr3+,Yb3+ (LMG:Cr3+,Yb3+) phosphor has been successfully designed by [Cr3+–Yb3+] co-doping. The broadband emission phenomenon of LaMgGa11O19:Cr3+ was confirmed to be due to selective lattice occupancy of Cr3+ ions based on the analysis of crystal structures, crystal field calculations, and fluorescence lifetimes. The NIR emission spectra in the range of 1000–1200 nm were enriched by using the highly efficient energy transfer of Cr3+ → Yb3+ ions and the energy transfer mechanism is discussed in detail. The prepared LMG:Cr3+,Yb3+ phosphors exhibit highly efficient ultra-broadband NIR emission from 650 to 1200 nm under 440 nm excitation with high internal and external quantum efficiencies of 94.2%/40.5% and excellent luminescence thermal stability of 89.3%@373 K. A NIR pc-LED prototype was fabricated by combining the optimized phosphor with a commercial 440 nm blue LED chip, providing 84.5 mW NIR output power at a 350 mA driving current. Finally, the potential applications of the phosphor in night vision lighting and non-destructive testing were demonstrated. The results show that this work is expected to provide a new strategy for efficient ultra-broadband NIR phosphor design.
研究领域:
材料科学
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光学材料
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固态照明
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光子学
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能量传递
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DYES AND PIGMENTS
·
2025
·
IF 4.2
Chengda Wu,Yahong Jin
Broadband near-infrared (NIR) phosphor-converted light sources (pc-LSs) are indispensable for emerging technologies that exploit the 700–1100 nm biological transparency window, yet their performance is critically limited by the scarcity of phosphors that simultaneously deliver red-shifted emission, high quantum efficiency, and thermal robustness. Here, we report a Cr 3+ -activated garnet Ca 2 GdZrSnGa 3 O 12 engineered by Ca–Zr/Sn cooperative substitution and M 5+ charge compensation. The incorporation of Cr 3+ into host lattice with a weak-field octahedral environment produces broadband NIR emission ( 4 T 2 → 4 A 2 ) centered at 801 nm with bandwidth of 168 nm under 466 nm excitation. M 5+ cations codoping suppresses non-radiative pathways, elevating IQE to 51.58 % and retaining 81.58 % of the room-temperature intensity at 423 K. A low Huang-Rhys factor ( S = 0.94) and enlarged activation energy ( E a = 0.25 eV) corroborate the suppressed electron–phonon coupling. Prototype phosphor-converted laser diode (pc-LD) and light-emitting diode (pc-LED) packages deliver optical output powers up to 381.2 mW@1500 mW mm −2 and 51.2 mW@300 mA with photoelectric conversion efficiencies approaching 25.4 % and 4.48 %, respectively. These findings provide a materials-by-design route that reconciles the long-standing trade-off between spectral red-shift, quantum efficiency, and thermal robustness in Cr 3+ -activated NIR systems, and constitute a decisive advance toward compact, high-power NIR light engines for next-generation photonic applications.
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OPTICAL MATERIALS
·
2024
·
IF 3.8
Renjie Jiang,Jie Chen,Mingqin Li,Yanna Tian,Shiji Shen,Xuan Yang,Yanru Tang,Yan Sun,Hui Lin,Shengming Zhou
Ce: YAG- Al 2 O 3 composite ceramics are regarded as highly promising materials for laser illumination application due to their high luminous efficacy and thermal stability. Nevertheless, the Ce: YAG ceramics exhibit limited color rendering index (CRI) for indoor lighting due to their low red emission component. In this study, we synthesized high-performance Ce, Mn-doped (Y, Tb) 3 Al 5 O 12 –Al 2 O 3 composite ceramic phosphors via a vacuum solid-state sintering method. It was observed that the introduction of Mn 2+ ions created a second luminescence center with an emission peak centered at 580 nm. As the Mn 2+ concentration increased, the emission peak redshifted from 580 nm to 591 nm, leading to a significant enhancement in the color rendering index of the ceramics. The cross-energy transfer between Tb 3+ and Mn 2+ , Ce 3+ ions augmented the absorption and conversion of blue light by the ceramics, thereby reducing the correlated color temperature greatly. Based on these findings, ceramics with a Ce 3+ concentration of 3 at% and a Mn 2+ concentration of 4 at% exhibited the highest CRI values (81.3 and 75.6) under both laser excitation and LED excitation, establishing them as strong candidates for achieving high color rendering in white LED/LD illumination applications.
研究领域:
材料科学
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光学工程
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
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2023
·
IF 5.4
Hao Xu,Ziyi Luo,Renlong Zhang,Iuliia Golovynska,Yanxia Huang,Soham Samanta,Ting Zhou,Shaowei Li,Bingang Guo,Liwei Liu,Xiaoyu Weng,Jun He,Changrui Liao,Yiping Wang,Tymish Y. Ohulchanskyy,Junle Qu
Although photobiomodulation (PBM) and gamma visual stimulatqion (GVS) have been overwhelmingly explored in the recent time as a possible light stimulation (LS) means of Alzheimer's disease (AD) therapy, their effects have not been assessed at once. In our research, the AD mouse model was stimulated using light with various parameters [continuous wave (PBM) or 40 Hz pulsed visible LED (GVS) or 40 Hz pulsed 808 nm LED (PBM and GVS treatment)]]. The brain slices collected from the LS treated AD model mice were evaluated using (i) fluorescence microscopy to image thioflavine-S labeled amy-loid-β (Aβ) plaques (the main hallmark of AD), or (ii) two-photon excited fluorescence (TPEF) imaging of unlabeled Aβ plaques, showing that the amount of Aβ plaques was reduced after LS treatment . The imaging results correlated well with the results of Morris water maze (MWM) test, which demonstrated that the spatial learning and memory abilities of LS treated mice were noticeably higher than those of untreated mice. The LS effect was also assessed by in vivo nonlinear optical imaging , revealing that the cerebral amyloid angiopathy decreased spe-cifically as a result of 40 Hz pulsed 808 nm irradiation, on the contrary, the angiopathy reversed after visible 40 Hz pulsed light treatment. The obtained results provide useful reference for further optimization of the LS (PBM or GVS) parameters to achieve efficient phototherapy of AD.
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CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Ying Huang,Jiani Yao,Jiaqi Ren,Yangyang Li,Shujie Zheng,Zhongjian Li,Yang Hou,Lecheng Lei,Dionysios D. Dionysiou,Bin Yang
Treating wastewater to augment surface water can be a practicable solution to water scarcity, while the residual contaminants of emerging concern (CECs) and inorganic ions put forward new requirements to the treatment methods. Electrochemical chlorine process (EC/Cl 2 ) utilizes the remaining Cl − in wastewater to generate free chlorine and radicals, which could be further improved in conjunction with LED UV 275nm irradiation (UV-EC/Cl 2 ). Compared to UV only and EC/Cl 2 , UV-EC/Cl 2 could effectively decompose the selected CECs at higher rates due to the much higher yield of reactive chlorine species (Cl • , ClO • , and Cl 2 •− ). A MATLAB R2021a programming method was developed to estimate the order of magnitude of these radicals, and Cl 2 •− was the most abundant radical. In the UV-EC/Cl 2 system, CECs with phenolic or aniline moieties were mainly degraded by electrochemical oxidation (EC), ClO • , and Cl 2 •− ; and the CECs with weakly electron-donating moieties were predominately decomposed by EC , • OH, and Cl • . The degradation pathways of levofloxacin, diclofenac, carbamazepine (CBZ), and ibuprofen were proposed according to the transformation products (TPs) detected by LC/Q-TOF-MS. Moreover, the cytotoxicity of spiked CBZ in real water samples, that were discharged to surface water, was significantly reduced by UV-EC/Cl 2 . Interestingly, the electrical energy per order (E E/O ) for CBZ decomposition by LED UV 275nm -EC/Cl 2 (1.46 kWh m −3 order −1 ) is lower than that by UV/Cl 2 , EC/Cl 2 , and UV 254nm -EC/Cl 2 . The results indicate that UV-EC/Cl 2 could be used as a promising method to remediate CECs during the tertiary treatment and reuse of wastewater for augmenting surface water.
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DYES AND PIGMENTS
·
2023
·
IF 4.5
Xianjun Zhao,Bo Hu,Qun Zhou,Yijie Yu,Erhong Hao,Xing Guo,Yangyang Xu,Changjiang Yu,Ke Sun,Jacques Lalevée
Until now the photopolymerization process is largely dependent on the hazardous UV or near UV light irradiation. Herein this work, a series of boron dipyrromethene (BODIPY) derivatives substituted by electron-donating triphenylamine moiety on different positions were introduced and investigated thoroughly. Markedly, their photoinitiation abilities under mild conditions, e.g. visible LEDs irradiation and room temperature, were examined for the first time. In combination with an iodonium salt and an amine as the co-initiators, these BODIPY dyes could form three-component photoinitiating systems (PISs) for the purpose to initiate both the free radical polymerization of acrylate monomers and cationic polymerization of epoxy monomers. Interestingly, under the irradiation of LED@405 nm, LED@530 nm or LED@660 nm, some of these BODIPYs-based PISs could conduct high monomeric conversion and rapid photopolymerization rates, as reflected by the relevant photopolymerization kinetics. Then the notable photochemical reactivity of these BODIPY dyes was examined by both steady state photolysis and fluorescence quenching experiments, and theoretical calculation was also performed on them in details. Finally, photocuring 3D printing technique was applied to the acrylate/epoxy mixture resin, as the result the BODIPYs-based PISs demonstrated great potential to fabricate truly three-dimensional objects in macroscopic scale with excellent spatial resolution.
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Advanced Optical Materials
·
2019
·Vol. 7
·期 12
·1900093
·
IF 7.125
Sisi Liang,Guogang Li,Peipei Dang,Yi Wei,Hongzhou Lian,Jun Lin
Currently, Mn 4+ -activated red-emitting materials are the research hotspot due to their promising application in phosphor-converted white light-emitting diodes (w-LEDs). Here, a typical cation substitution strategy is reported to optimize Mn 4+ -doped germinate phosphor for improving luminescence performances. The effect of cation substitution for Ge 4+ ions by Ti 4+ , Sn 4+ , and Si 4+ ions on lattice structure, photoluminescence properties, and thermal stability of the as-prepared Mn 4+ -doped germinates is systematically investigated. A significant improvement of emission intensity with Ti 4+ doping should benefit from the resonance emission enhancement effect. Some lattice distortion defects contribute to the thermal stability enhancement, which plays a role in driving the excited phonon traps to compensate the energy loss of nonradiative transition. Surprisingly, abnormal variation in intensity of anti-Stokes and Stokes emission peaks with changing temperature is first observed, revealing a potential application in thermometry. The electroluminescence performances of as-fabricated w-LED devices using Mg 14 Ge 5 Ti 0.5 O 24 :Mn 4+ red phosphor are evaluated, which possess higher color rendering index ( R a = 87.3) and luminous efficiency (109.42 lm W −1 ) as well as lower color correlated temperature (3566 K) than those using Cs 2 GeF 6 :Mn 4+ and CaAlSiN 3 :Eu 2+ red phosphors. The results reflect the superiority of the studied phosphor in w-LEDs and optical thermometry areas.
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APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Chao Yin,Yali Liu,Xiaorong Kang,Xin Li
Graphitic carbon nitride (g-C 3 N 4 , CN) has been applied to degrade a variety of pollutants. However, two major defects, the low utilization of light energy and the high recombination of photogenerated electron and hole (e - -h + ) pairs, need to be improved. In this study, a LED-light-driven photocatalyst, carbon dots decorated graphitic carbon nitride (CNC), was successfully prepared by simple thermal polymerization. Due to the remarkable up-conversion photoluminescence properties and superior charge transport capability of CDs, CNC had higher e - -h + separation efficiency and broader visible light response. In this experiment, a combined process of CNC and persulfate (CNC/PS) was used for tetracycline (TC) degradation. High-efficient photocatalytic degradation rate of 81.9% was obtained in the CNC/PS system. Moreover, the mechanism analysis indicated that the reaction between PS and photogenerated e - effectively promoted the separation of electrons-holes pairs, thereby enhancing the formation of dominant active radicals •O 2 - and holes for TC degradation.
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FOOD CONTROL
·
2021
·
IF 5.548
Lihui Zhang,Min Zhang,Sakamon Devahastin,Kun Liu
Casein and ethyl cellulose (Cas + EC) complexes were fabricated and used for encapsulation of curcumin (Cur). Physicochemical properties of Cas + EC/Cur along with its antibacterial activity when used in combination with blue LED irradiation were investigated. Encapsulation efficiency of microparticles at Cas:EC of 1:1 was the highest at 92.4%, with average particle size of 1.47 μm and ζ-potential of −21.40 mV. Fourier transform infrared spectroscopy revealed that Cur was well encapsulated in Cas + EC by electrostatic interactions; more hydrogen bonds were also formed. At optimal encapsulation condition, Cur exhibited good thermal stability; its water solubility improved 69 folds, while its release rate in oily food mimic reached 76%. Cas + EC/Cur in combination with blue LED irradiation could rapidly inactivate Escherichia coli ATCC 43894, Staphylococcus aureus ATCC 23235 and Pseudomonas aeruginosa MCC-208. Such desirable activities are attributed to the production of reactive oxygen species, which caused increased membrane permeability and reduced bacterial cell integrity.
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EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Feifei Li,Lin Zhou,Ziqi Zhang,Mengmeng Li,Lin Lei
A facial white light-emitting diode (LED) induced reversible deactivation radical polymerization (RDRP) of methacrylate monomers was successfully conducted by using sub-ppm-level organic dyes as organocatalysts. The organic dyes contained Eosin B (EB), Rose bengal (RB), Eosin Y (EY) and 3,3,5,5-Tetraiodophenolsulfonphthalein (TIPS) with the merits of metal free, non-toxic and inexpensive. The resulted poly (methacrylate) with controlled molecular weights and polydispersity indices were obtained either under white LED irradiation or green and blue LED. The polymerization of various functional methacrylates demonstrated that this polymerization system with dyes as organocatalysts had high monomer versatility. Chain extensions copolymerization verified the living features of reversible deactivation radical polymerization.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Ze-Chen Gao,Yi-Li Lin,Bin Xu,Ying Xia,Chen-Yan Hu,Tian-Yang Zhang,Tong-Cheng Cao,Yang Pan,Nai-Yun Gao
This study compared the degradation of dissolved organic matter (DOM) by UV/chlorine advanced oxidation processes (AOPs) with emerging ultraviolet light-emitting diode (UV-LED, 275 nm) and traditional low pressure UV (LPUV, 254 nm) as UV sources. Excitation emission matrix-parallel factor (EEM-PARAFAC) analysis and two-dimensional (2D) correlation gel permeation chromatograph were applied to explore the evolutions of DOM during oxidation processes. The degradation behaviors of DOM indicated by UV absorbance at 254 nm (UV 254 ), dissolved organic carbon (DOC), and fluorophores fitted the pseudo-first-order kinetics well. The removal efficiency of DOM was similar under UV-LED and LPUV irradiation alone. However, UV-LED exhibited much higher degradation rates (increased by 29–160%) than LPUV regardless of the tracking variables during UV/chlorine processes. For three PARAFAC components, humic-like fluorescences were preferentially degraded by UV/chlorine oxidation compared with protein-like fluorescence potentially due to the differences of electronic moieties and molecular weight (MW). The decline in UV 254 , DOC, and fluorophores increased with increasing chlorine dosage; linear correlations between those indicators were observed during the two AOPs. Moreover, UV-LED/chlorine could achieve greater extents of MW change. Our study demonstrated that UV-LED could be a superior alternative for the future selection of UV source in the UV/chlorine process.
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Nanoscale
·
2019
·Vol. 11
·期 8
·3489-3494
·
IF 6.97
Zhen Tian,Pengfei Tian,Xiaojie Zhou,Gufan Zhou,Shiliang Mei,Wanlu Zhang,Xutao Zhang,Di Li,Ding Zhou,Ruiqian Guo,Songnan Qu,Andrey L. Rogach
Herein, we report UV-pumped white light emissive carbon dot (CD)-based phosphors to prevent blue light hazard in phosphor-converted WLEDs. Then, UV-pumped WLEDs with a color rendering index exceeding 85 and VLC with a modulation bandwidth of 75 MHz and a data transmission rate of 224 Mbps have been realized.
研究领域:
材料科学
·
光学工程
·
电子工程
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