JOURNAL OF LUMINESCENCE
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2024
·
IF 3.3
Daqian Wu,Fengxian Zhou,Kai Feng,Jun Wang,Qixuan Lu,Xiaowu Wang,Zijun Zhan,Weiwei Chen,Zhengzheng Liu,Zeyu Zhang,Zhiping Hu,Juan Du
Lead halide perovskite quantum dots (QDs) have garnered significant attention due to their tunable band gaps, unique quantum confinement effects, and high photoluminescence quantum yields (PLQYs). Among them, Organic-inorganic QDs make them promising candidates for optoelectronic devices such as quantum dot light-emitting diodes (QLEDs), solar cells, lasers, and photodetectors. However, the toxicity of lead (Pb) has raised environmental and health concerns, hindering their industrial application. To alleviate concerns about heavy metals Pb, extensive research has been conducted on B-site doping and the development of lead-free perovskites. Herein, we firstly developed B-site doping strategy on organic-inorganic hybrid perovskite QDs via rare-earth elements. Neodymium (III) (Nd 3+ ) doped FAPbBr 3 QDs were prepared through the ligand-assisted reprecipitation method at room temperature. The B-site doping strategy could alleviate the heavy metal problem of Pb and modulate the band gap of FAPbBr 3 QDs facilely. The results demonstrated that increasing the concentration of Nd³⁺ can change the emission of FAPbBr₃ QDs from pure green to deep blue. Specifically, we achieved highly pure blue emission (∼438 nm) with a full width at half maximum (FWHM) of 13 nm for Nd³⁺-doped FAPbBr₃ QDs. Time-resolved photoluminescence (TRPL) spectroscopy revealed a decrease in the lifetime of FAPbBr₃ QDs from 22.86 to 15.46 ns as the doping concentration increased. Additionally, we fabricated a white LED (WLED) utilizing blue-emitting Nd³⁺-doped FAPbBr₃, green-emitting FAPbBr₃ QDs, and red QDs, achieving a white emission color coordinate of (0.33, 0.36). This study pioneers the application of B-site rare-earth doping in organic-inorganic hybrid perovskite QDs, demonstrating that B-site composition engineering is a reliable strategy to further exploit the perovskite family for wider optoelectronic applications.
研究领域:
材料科学
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光学工程
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电子工程
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DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2020
·Vol. 298
·期 10
·1285-1291
·
IF 1.536
Xie Chuanbao,Leng Kangwei,Sheng Jie,Wang Xuemei,Li Qianmin,Song Liang,Liu Lei,Sun Hejing,Huang Xiaowen,Wang Zhongwei,Yu Qing
Poly(methyl methacrylate) (PMMA) microspheres were synthesized through visible light–induced photopolymerization of methyl methacrylate (MMA). 2,4,6-Trimethylbenzoyldipenylphosphine oxide (TPO), polyvinylpyrrolidone (PVP), and light-emitting diodes (LEDs) were used as the photoinitiator, stabilizer, and light source, respectively. No other additive was involved. The effect of LEDs, TPO, and PVP was discussed. Results showed that PMMA microspheres with the size of 0.5–0.8 μm could be obtained when LED@385 nm was the light source, and the content of TPO and PVP was 2 wt% and 30 wt% of MMA. Moreover, the possible formation pathway of PMMA microspheres was proposed based on the investigation of reaction time and addition method of PVP.
Graphical abstract
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Liang He,Xueyan Nan,Peipei Wang,Zhizhou Liu,Tong Wang,Pengli Bai
The nonconventional polymer luminophores (NPLs) with white emission are scarce due to the challenges in regulating their clustering structures. In this work, polystyrene is employed to develop a new kind of broad-emitting clusteroluminescence (CL) through suitable cross-linking and sulfonation. The sulfonated porous poly(styrene-co-divinylbenzene) microspheres (SPDMs) exhibit broad emission spectra (400–700 nm) in the visible light region. Further characterization and theoretical calculations show that through-space conjugation (TSC) enhanced with high cross-linking and sulfonation degrees (SD) is the main factor affecting the luminescence of microspheres. Monodisperse SPDMs with a low fluorescence distribution (CV < 5%) across 13 flow channels. Additionally, SPDMs microspheres is employed to construct binary, Cu 2+ , and pH-responsive microarrays to encrypt and decode important information. Finally, SPDMs are developed for utilization as single-component white and warm white light-converting light emitting diodes (LEDs). These LEDs demonstrate Commission International de L’Eclairage (CIE) coordinates and correlate color temperatures (CCT) of (0.31, 0.321) and (0.383, 0.41), 6611 and 4100 K, respectively. Notably, the color rendering index (CRI) value for SPDMs-50-2 in white LED applications reaches an impressive 92. This study provides an economical, simple, and effective design strategy for developing NPLs with both monodispersity and broad emission.
研究领域:
材料科学
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光学
·
化学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Zhenyu Tang,Peichang Ouyang,Yunfang Liu
Plant greenhouse planting has aroused great attention to the development of plant growth light-emitting diode (LED) light source. Far-red emitting phosphors as the main component of plant growth LED lighting have been studied more and more widely. In this study, Li 1.6 Mg 1.6 Sn 2.8 O 8 :Fe 3+ with far-red emission for plant LED lighting is synthesized in air. X-ray diffractometer (XRD) with the energy dispersive spectroscopy (EDS) is used to test XRD patterns, EDS, and the element mapping diagrams, confirming that Li 1.6 Mg 1.6 Sn 2.8 O 8 :Fe 3+ has a hexagonal crystal structure of with pure phase Li 1.6 Mg 1.6 Sn 2.8 O 8 . Photoluminescence excitation (PLE) spectrum, time-resolved PL spectra, decay curves, photoluminescence (PL) spectrum, as well as concentration and temperature dependent PL spectra are investigated in detail. Li 1.6 Mg 1.6 Sn 2.8 O 8 :Fe 3+ under excitation at 305 nm shows far-red emission peaking at ∼702 nm due to the transition 4 T 1 ( 4 G) → 6 A 1 ( 6 S) of Fe 3+ ion in octahedron [FeO 6 ]. PL spectrum of Li 1.6 Mg 1.6 Sn 2.8 O 8 :Fe 3+ matches with the absorption spectra of plants during the process of photosynthesis, indicating a promising application of Li 1.6 Mg 1.6 Sn 2.8 O 8 :Fe 3+ in plant growth LED lighting. Time-resolved PL spectra prove the only luminescence center (Fe 3+ ). Concentration dependent PL spectra confirm the optimal Fe 3+ concentration (0.8 mol%) and the concentration quenching mechanism is analyzed. The temperature dependent PL spectra show good thermal stability of Li 1.6 Mg 1.6 Sn 2.8 O 8 :Fe 3+ and the heat quenching mechanism is explained.
研究领域:
材料科学
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园艺学
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产品关联
DOI
高影响因子
Silicon
·
2021
·Vol. 14
·期 3
·1159-1167
·
IF 2.67
Pan Zhaoqun,Chen Mianfeng,Zeng Keling,Kang Yingzi
The epoxy-modified silicones have the advantages of both epoxy and organic silicon. In this paper, a series of epoxy-modified methyl phenyl silicone resins were synthesized through the hydrosilylation reaction between 1, 2-epoxy-4-vinylcyclohexane and methyl phenyl silicone resins. The effects of catalyst dosage, reaction time and temperature on the products were further discussed to determine optimal reaction conditions. Then, the as-prepared epoxy-modified silicone resins were cured with methylhexahydrophthalic anhydride. The curing kinetics was investigated through differential scanning calorimetry (DSC). The curing conditions were determined as follows: 1-h curing at 80 °C for and subsequent 1-h curing at 110 °C. The as-prepared products exhibited high light transmittance (~ 90% at 450 nm), strong bonding, suitable hardness and sound waterproof performance. In addition, the introduction of methylphenylsiloxane chain significantly improved the heat resistance and UV resistance of cured products. The epoxy-modified silicone resins are ideal LED packaging materials.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Materials Today Energy
·
2020
·
IF 5.604
Qi Sun,Shaoying Wang,Liangling Sun,Jia Liang,Balaji Devakumar,Xiaoyong Huang
At present, near-ultraviolet-pumped white light-emitting diodes (LEDs) based on tri-color (blue, green, and red) phosphors still suffer from insufficient color rendering index (CRI), due to the presence of cyan gap in the 480–520 nm spectral range. To solve this problem, it is urgent to develop an efficient cyan phosphor with emission peak around 490 nm and absorption band in the near-ultraviolet range of 380–420 nm. Herein, a highly efficient cyan-emitting Ca 2 GdHf 2 (AlO 4 ) 3 :Ce 3+ (CGHA:Ce 3+ ) garnet phosphor with internal quantum efficiency as great as 80% is reported. Impressively, the CGHA:1%Ce 3+ sample showed a broad excitation band ranging from 350 to 470 nm with a maximum at 408 nm, and upon 408 nm excitation it exhibited an intense broad cyan emission band in the 420–700 nm wavelength range with peak at 489 nm and a full width at half-maximum of 103 nm. Importantly, by applying the newly discovered cyan-emitting CGHA:1%Ce 3+ phosphors as color converter, the CRI value of the fabricated warm-white LED device is greatly enhanced from 80.5 to 91.6. This work demonstrates that the novel developed CGHA:Ce 3+ cyan phosphors could compensate for the cyan gap and realize full-visible-spectrum lighting, which have a bright prospect in high-quality solid-state white lighting.
研究领域:
材料科学
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光学工程
·
固态照明
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产品关联
DOI
高影响因子
JOURNAL OF PLANT GROWTH REGULATION
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2024
·
IF 3.9
Luo Liping,Zhang Gaowei,Liang Wenjing,Wu Dong,Sun Qifang,Hao Yingbin
Broccoli microgreens represent a novel type of vegetable characterized by high levels of bioactive compounds. Here, we investigated the effects of light-emitting diode (LED) light quality on the development and nutritional uptake of broccoli microgreens. The plants were exposed to five distinct light treatments: white, single red, and red: blue at 5:1, 5:3, and 5:5 ratios. The soluble sugars, nutrients, and secondary metabolites of broccoli sprout extracts were examined using high-performance liquid chromatography and ultra-high-performance liquid chromatography quadrupole time-of-flight mass spectrometry under various light-quality conditions. In addition, the expression levels of genes encoding important enzymes in the glucosinolates (GLs) biosynthesis pathway were examined using quantitative real-time polymerase chain reaction. Overall, the findings demonstrated that mixed red-blue light, especially the 5:1 red: blue ratio, was beneficial for broccoli microgreens in terms of their hypocotyl length, fresh weight, edible rate, soluble proteins, vitamin C, total phenolics, total flavonoids, and GLs. Our findings provide a foundation and reference point for selecting the most appropriate LED light ratio in microgreens production.
研究领域:
植物学
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农业科学
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食品科学
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产品关联
DOI
高影响因子
IEEE Photonics Journal
·
2025
·Vol. 17
·期 2
·1-7
·
IF 2.4
Zong-Tao Li,Yi-Hua Qiu,Jia-Sheng Li,Jin-Cheng Li,Bin-Hai Yu,Xin Zhu,Xin-Rui Ding
Highly light-absorbed encapsulation is generally used to eliminate the ambient light for light-emitting diode (LED) display devices, it is challenging to simultaneously achieve a high ambient contrast ratio (ACR) and high light output efficiency (LOE). To solve this problem, we propose an inverted packaging structure for LED display devices. The LED chips’ emitting surface is mounted on the transparent carrier board (TCB) while the backside is packaged by the composite encapsulation, causing that the substrate is inverted to the topside of devices. As a result, the chips can emit light directly from the TCB and avoid the absorption loss of the encapsulation, leading to the high ACR and LOE performances. Compared to traditional devices, the inverted device showed an average increase of over 800% in luminous flux (LF) and LOE, and an average increase of over 390% in ACR. Additionally, the devices exhibited excellent soldering performance, corrosion resistance, airtightness, and thermal stability. This novel device overcomes the bottleneck of achieving both high ACR and high LOE, providing new insights for the development of LED display technology. Future work can further optimize the structure and materials of the TCB and composite encapsulation to enhance device performance.
研究领域:
光学工程
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材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xingke Zheng,Aochen Du,Yun Ye,Enguo Chen,Sheng Xu,Tailiang Guo
Amidst growing concerns for environmental sustainability and green ecology, the utilization of Light Emitting Diodes (LEDs) for indoor plant cultivation has emerged as an influential area of research. Nonetheless, the growth of indoor plants is often constrained by inadequate lighting. Consequently, designing novel LEDs to create an appropriate light environment has emerged as a focal point in research. As a new type of photocatalytic material with excellent optical properties and light stability, double perovskite has broad application prospects in LEDs manufacturing. In this context, this article aims to synthesize a new Ca 2 Lu(Nb,Mn)O 6 double perovskite and study its optical properties in LEDs lighting for indoor plant growth. A new Ca 2 Lu(Nb,Mn)O 6 double perovskite were synthesized using the traditional high-temperature solid-phase method. The crystal structure and luminescence properties of the double perovskite were characterized in detail using powder X-ray diffraction (XRD), Rietveld refinement , excitation and emission spectra, decay lifetimes, quantum efficiency (QE), electron paramagnetic resonance (EPR) spectra, temperature-dependent emission spectra, and the Commission International de l’Eclairage (CIE) color coordinates. The photoelectric properties of Ca 2 Lu(Nb,Mn)O 6 and Ca 2 LuNbO 6 double perovskite have been explored through first-principles investigations. The absorption spectra from 270 to 600 nm indicates that it can be effectively excited by ultraviolet (UV) light. The emission spectra show a strong broad red emission peak at 684 nm. The luminescence mechanism has been studied using the Tanabe-Sugano diagram. In addition, the internal UV emission ratio β 1 , crystal field strength D q , and Racah parameters B and C were evaluated. The thermal stability of the sample was studied through emission spectra at heating temperatures from 303 to 573 K. The results indicate that Ca 2 Lu(Nb,Mn)O 6 double perovskite provides a new solution for indoor plant growth.
研究领域:
材料科学
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光学工程
·
植物学
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产品关联
DOI
高影响因子
WATER ENVIRONMENT RESEARCH
·
2020
·Vol. 92
·期 12
·2049-2059
·
IF 1.369
Mengyi Wu,Yulin Tang,Qianhong Liu,Zhenjiao Tan,Mu Wang,Bin Xu,Shengji Xia,Shun Mao,Naiyun Gao
In this study, UV-LED was employed as a novel light source to investigate the degradation of a representative antibiotic compound, chloramphenicol (CAP), in the absence or presence of H 2 O 2 . The UV-LED irradiation showed a higher capability for degradation of CAP than conventional UV-Hg vapor lamps. Effects of the initial CAP concentration, UV wavelength, and light intensity on the degradation of CAP by UV-LED were evaluated. Introduction of H 2 O 2 evidently enhanced the degradation efficiency of CAP due to the production of reactive hydroxyl radicals. Results showed that the UV-LED/H 2 O 2 removed CAP by up to 95% within 60 min at pH 5.0, which was twice as that achieved by the UV-LED alone. The degradation products were identified to propose plausible degradation pathways. Moreover, the formation potentials of typical carbonaceous disinfection by-products (C-DBPs) and nitrogenous disinfection by-products (N-DBPs) were assessed for the CAP polluted water treated by the UV-LED alone and UV-LED/H 2 O 2 processes. Results indicate unintended formation of certain DBPs, thereby highlighting the importance of health risk assessments before practical application. This study opens a new avenue for developing environment-friendly and high-performance UV-LED photocatalytic reactors for abatement of CAP pollution in water. Practitioner points UV-LED bore higher capability to degrade CAP than low-pressure Hg lamp. The optimal performance to degrade CAP can be achieved at the UV wavelength of 280 nm. The degradation efficiency under UV-LED/H 2 O 2 process was double of that under UV-LED process. TCM, DCAN, and TCNM formation were higher under the existence of UV-LED radiation. The addition of H 2 O 2 had greater influence on the formation of DCAcAm than the introduction of UV-LED.
研究领域:
环境科学
·
水处理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yanan Li,Shujie Gai,Hui Zhu,Jian Yin,Wenyuan Guo,Maxim S. Molokeev,Xiangyang Lu,Mao Xia,Zhi Zhou
Herein, the strategy of replacing Ge 4+ with smaller Si 4+ was adopted to realize the site-selective occupation of Bi 3+ activator in the small ring and obtain a near-infrared light-emitting in Zn 2 (Ge,Si)O 4 . The designed phosphor exhibits a broad NIR emission with FWHM ≈104 nm in the 650−860 nm region, with a center emission wavelength of about 750 nm. Interestingly, the more sensitive four-member ring sites gradually replaced the six-member ring sites and realized a large-scope photoluminescence regulation from blue to NIR by just after the crystal field engineering. The possible reasons for this phenomenon can be interpreted by centroid shift ( ε c ) and crystal field splitting ( ε cfs ). This work not only provides new insights for the development of Bi 3+ -activated NIR-emitting phosphors, but also provides thoughts for revealing the potential NIR luminous mechanism of Bi 3+ .
研究领域:
材料科学
·
光电技术
·
光子学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Miao Ma,Qing Wang,Qianqian Su,Weizhe Liu,Hui Xia,Caixia Zhou,Mengtian Li,Fang Yang,Fujian Xu
Blood uric acid (UA) levels are closely associated with various diseases. This study presents a novel UA photothermal detection system. UA reacts with uricase to generate hydrogen peroxide, which then oxidizes 3,3′,5,5′-tetramethylbenzidine (TMB) into oxidized TMB (oxTMB) in the presence of copper ions as the catalyst. Crucially, instead of expensive laser, Light Emitting Diode (LED) was applied to offer the irradiation on oxTMB, inducing a temperature increase. The increment of temperature measured by a handheld household thermometer exhibits a linear correlation with the concentration of UA in the samples. This method demonstrates enhanced detection sensitivity and excellent anti-interference capabilities. It has been successfully applied to precisely determine UA levels in volunteer blood samples. The sensing platform achieves portable UA detection in human blood within 3 min, featuring a linear response range of 50–400 μM, a detection limit (LOD) of 14.4 μM. This work establishes a novel miniaturized LED-based photothermal (LED-PT) uric acid detection device, holding significant potential for rapid, portable UA monitoring in healthcare and clinical diagnostics.
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产品关联
DOI
高影响因子
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