Laser & Photonics Reviews
·
2023
·Vol. 17
·期 8
·2200940
·
IF 11
Yiyang Liu,Rong Zhang,Kaiyi Yan,Jian-Feng Sun
The mineral structure-inspired discovery of red phosphors has become a research hotspot that can help compensate for the missing red components in cold white light-emitting diodes (WLEDs). Herein, first the feldspar-type structure is utilized to develop narrowband red-emitting CaAl 2 Si 2 O 8 :Mn 4+ /Mn 4+ , Mg 2+ phosphors. Rietveld refinement results confirm the Mn 4+ occupation of the distorted [Ca1O 6 ] octahedron, resulting in a strong nephelauxetic effect, and thus exhibits bright red luminescence with a narrow full width at half maximum (43 nm). Compared with CaAl 2 Si 2 O 8 :Mn 4+ , the fluorescence intensity of CaAl 2 Si 2 O 8 :Mn 4+ , Mg 2+ is further enhanced by up to 210% owing to the decreasing nonradiative decay rate from 2 E g excited state, which weakens the concentration quenching effect resulting from energy migration along the adjacently aggregated Mn 4+ . CaAl 2 Si 2 O 8 :Mn 4+ , Mg 2+ shows preferable thermal stability with an ultrahigh quantum efficiency (90.3%), surpassing other current Mn 4+ -doped oxide phosphors and UCr 4 C 4 -type nitride phosphors. A fabricated prototype WLED obtains ideal warm white light with a low correlated color temperature (3081 K) and a wide color gamut covering 112% of the National Television System Committee standard. Guided by natural mineral-type structural prototypes, this study demonstrates the possibility of designing a uniquely distorted local structure to achieve a superior luminescence performance of Mn 4+ for warm WLEDs.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Zhihao Zhang,Md All Amin Newton,Xue Yang,Binjie Xin
In this study, a novel red fluorescent materials were prepared by incorporating Eu/PVP/TPPO complexes into PAN substrates. An Eu/PVP/TPPO complex was synthesized by introducing polyvinylpyrrolidone (PVP) into a mixture of europium (Eu) and triphenylphosphine oxide (TPPO). Using a spin-coating technique, highly efficient and thermally stable Eu/PVP/TPPO/polyacrylonitrile (PAN) fluorescent films were prepared. The molecular interactions , surface morphology , functional groups, and elements of the Eu/PVP/TPPO/PAN fluorescent films were characterized by FT-IR, SEM, UV–Vis, and EDS analysis. The thermal stability, fluorescent properties, and chromaticity of the films were also systematically investigated. The results showed that the Eu/PVP/TPPO complex could disperse uniformly in the substrate, and the fluorescent films could emit homogeneous red light. Furthermore, the Eu/PVP/TPPO/PAN fluorescent films had a strong synergistic effect, which increased the fluorescence intensity and produced a purer red light. Based on these findings, a new type of redlight LED device was fabricated by one-step method. Due to its outstanding properties, this film has great potential in the next generation of lighting and display applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2023
·Vol. 37
·期 10
·e7231
·
IF 3.9
Xianjie Yin,Helin Wang,Lei Shen,Qingle Zeng
A three-component reaction of olefins, indoles, and diaryl diselenides catalyzed by copper chloride under irradiation of blue LED light is disclosed. Various diaryl diselenides including diheteroaryl diselenides are suitable for this bifunctionalization of olefins. This protocol provides 26 examples of β-(hetero)arylselenyl indoles in 60%–87% yields. The proposed mechanism involves activation of diaryl diselenides by coordination with copper chloride, generation of arylselenium cations by heterolysis of activated diaryl diselenides, electrophilic addition of arylselenium cations to styrenes, and then Friedel–Crafts-type alkylation at the 3-position of NH-indoles.
研究领域:
有机化学
·
光化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 30
·18326-18332
·
IF 3.361
Ying Lu,Zhihang Zhao,Xianpeng Fan,Xinyu Cao,Mingtan Hai,Zhou Yang,Kun Zheng,Jiaxin Lu,Jingnan Zhang,Yongmei Ma,Rongben Zhang,Shibi Fang
To obtain a rapid processible LED encapsulant that leads to high and stable light extraction efficiency (LEE), UV curable ZrO2/phenyl-siloxane nano-composite (ZSC) double-layer encapsulants were prepared and optimized. The highly crystalline ZrO2 nanoparticles with a diameter of ∼14 nm were synthesized through a modified hydrothermal method at mild conditions, and a UV curable methacryl-diphenyl-polysiloxane (MDPS) with a refractive index (RI) of 1.54 (at 633 nm) was synthesized from self-condensation of diphenylsilanediol and an end-capping reaction. High refractive indexes (RIs) from 1.54–1.61 have been obtained for ZSC composites by adding 0–20 wt% ZrO2. Before and after sulfur vapor erosion, the double-layer encapsulated sample (M-10/M) showed 11.2% and 64.8% higher LEE respectively than that of Dow Corning OE-7662. Meanwhile, the variation of LED light color temperature (Tc) was less than 1%. The effect of the ZrO2 nanoparticle content on LEE of double-layer and single-layer encapsulation were compared and discussed based on Fresnel loss and Rayleigh scattering theories. The double-layered UV curing processing took only 1/6 of the time needed for common thermal curing.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2015
·
IF 3.368
Shuang Guo,Shuxue Zhou,Huijing Li,Bo You
This paper presents a facile method to fabricate volumetric light diffusing films with high transmittance and haze simultaneously by mimicking the micro- and nanostructure of compound eyes. Strawberry-like polymethyl methacrylate/SiO 2 composite microspheres were first prepared via the electrostatic attraction between positively charged PMMA spheres and negatively charged SiO 2 nanoparticles , and further blended with polyacrylate latex to produce light diffusing coatings. A novel light diffusing film with hemispherical surface was built by casting the light diffusing coatings on optical-grade PET film. Effects of the sizes of PMMA spheres and SiO 2 nanoparticles on the optical properties of light diffusing film were investigated by a haze meter and application on a LED lamp. The best result (transmittance 94.6% and haze 84.2%) was achieved for the strawberry-like composite microspheres based on 1 μm PMMA spheres and 50 nm SiO 2 nanoparticles. The light-diffusing mechanism of the strawberry-like microspheres in the film was discussed.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 19
·6569-6577
·
IF 4
Shihao Wu,Heng Liang,Yan Li,Wanfang Zou,Zhijian Liao,Wei Wang,Xinyu Ye
The Cr3+-doped near-infrared (NIR) phosphors have been extensively investigated owing to their promising applications in biomedicine, food safety detection, and night vision surveillance. However, achieving broadband (FWHM > 160 nm) NIR emission is still challenging. In this paper, novel Y2Mg2Ga2−xSi2O12:xCr3+ (YMGS:xCr3+, x = 0.005–0.08) phosphors were prepared by a high-temperature solid-state reaction. The crystal structure, photoluminescence properties of the phosphor, and the device performance of a pc-LED were researched in detail. When excited at 440 nm, the YMGS:0.04Cr3+ phosphor exhibited broadband emission in the range of 650–1000 nm, peaking at 790 nm with a full width at half-maximum (FWHM) of up to 180 nm. The wide FWHM of YMGS:Cr3+ is conducive to its extensive application in NIR spectroscopic technology. In addition, the YMGS:0.04Cr3+ phosphor could maintain 70% of the initial emission intensity at 373 K. By combining the commercial blue chip with the YMGS:0.04Cr3+ phosphor, the resulting NIR pc-LED demonstrated a near-infrared output power of 14 mW with a photoelectric conversion efficiency of 5% at a drive current of 100 mA. This work provides a broadband emission NIR phosphor option for NIR pc-LED devices.
研究领域:
材料科学
·
光学工程
·
生物医学工程
·
光电子学
·
固体化学
✓ 已验证
DOI
高影响因子
JOURNAL OF BIOMEDICAL OPTICS
·
2025
·Vol. 30
·期 4
·046501
·
IF 2.9
Huaiyuan Zhang,Yiting Hu,Xingwei Pu,Shizheng Zhang,Yi He,Kun Chen,Ziji Liu
Significance The multiplexing capabilities of fluorescence imaging are enhanced by its exceptional molecular specificity with diverse fluorescent probes, making it a powerful tool for studying complex biological structures, organization, and functions. Recent advances in super-resolution fluorescence microscopy have further revolutionized our ability to explore biology and related fields. However, current multicolor super-resolution fluorescence imaging systems often come with high costs and bulky designs. Aim We present a multicolor extended resolution fluorescence imaging system that uses light-emitting diode to simplify the optical path, make the design more compact, and reduce system costs. Approach This multicolor extended resolution fluorescence imaging system is based on structured illumination, utilizing a simple diffraction unit positioned between the light source and the sample in a wide-field microscope. Notably, this design could be easily integrated into standard widefield microscopes as a convenient add-on unit, enabling extended resolution imaging. Results Our system demonstrates concurrent extended resolved imaging of three-color microsphere beads and successfully showcases multicolor extended resolution fluorescence imaging of biological tissue samples, revealing intricate structural details. Conclusions This system provides a structurally simple, cost-effective alternative to traditional microscopes, offering flexible multicolor extended resolution fluorescence imaging and potential applications in multimodal imaging.
✓ 已验证
DOI
PubMed
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2022
·Vol. 86
·期 11
·2963-2973
·
IF 2.43
Li Ting,Zuo XiaoJun,Zhang SongHu,Kong QingGang
Recently, increasing attention has been paid to antibiotic resistance in stormwater runoff. However, there is no available literature about the control of antibiotic resistant bacteria (ARB) through 365 nm ultraviolet light-emitting diode (UVA/LED). In this study, batch experiments were conducted to investigate ARB inactivation kinetics, effects of light intensity and water matrix (including suspended solid (SS) concentration, initial pH and bacteria concentration), and potential transmission risks after UVA/LED irradiation. Results showed that ARB inactivation efficiencies reached 6.31 log reduction at 8 mW/cm 2 (86 J/cm 2 ) of UVA/LED for 180 min. ARB inactivation efficiencies increased with the increase of light intensity, and showed a linear relationship. ARB inactivation decreased with increasing SS levels, and the largest inactivation efficiencies was 3.56 log reduction at 50 mg/L of SS. Initial pH had slight effect on ARB inactivation through UVA/LED irradiation. A low initial bacteria concentration (10 5 CFU/mL) was not necessarily associated with good ARB inactivation (3.59 log reduction). After UVA/LED irradiation, ARB was hardly detected during 12 hr of dark repair, and the transfer frequency of kanamycin resistance gene was increased to 5.43 × 10 −4 . These suggested that the application of UVA/LED to inactivate ARB in stormwater runoff was feasible and desirable in this study. ARB inactivation reached 6.31 log reduction at 8 mW/cm 2 of UVA/LED for 180 min. UVA/LED inactivation kinetics could be well described by the first-order model. Initial pH and bacteria levels had weak effects for ARB inactivation. Potential risks of ARB could be blocked after 60 min of UVA/LED disinfection.
研究领域:
环境科学
·
微生物学
·
公共卫生
·
水利工程
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2017
·
IF 6.065
Yaowen Gao,Yixi Li,Linyu Yao,Simiao Li,Jin Liu,Hui Zhang
Catalysts are known to activate peroxides to generate active radicals (i.e., hydroxyl radical ( OH) and sulfate radical (SO 4 − )) under certain conditions, but the activation of peroxides in the absence of catalysts under visible light irradiation has been rarely reported. This work demonstrates a catalyst-free activation of peroxides for the generation of OH and/or SO 4 − through photoexcited electron transfer from organic dyes to peroxides under visible LED light irradiation, where Rhodamine B (RhB) and Eosin Y (EY) were selected as model dyes. The formation of OH and/or SO 4 − in the reactions and the electron transfer from the excited dyes to peroxides were validated via electron paramagnetic resonance (EPR), photoluminescence (PL) spectra and cyclic voltammetry (CV). The performance of the peroxide/dye/Vis process was demonstrated to be altered depending on the target substrate. Meanwhile, the peroxide/dye/Vis process was effective for simultaneous decolorization of dyes and production of active radicals under neutral even or basic conditions. The findings of this study clarified a novel photoexcitation pathway for catalyst-free activation of peroxides under visible light irradiation, which could avoid the secondary metal ion (dissolved or leached) pollution from the metal-based catalysts and expand the application range of the peroxide-based catalytic process.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY
·
2021
·
IF 7.147
Songping Mo,Jiarong Ye,Lisi Jia,Ying Chen
Mono suspensions of either nanoparticles or microencapsulated phase change material (MPCM) capsules (microcapsules) have shown superior thermophysical properties and heat transfer performance for thermal management. In this study, hybrid suspensions of nanoparticles and MPCM particles were prepared to integrate the advantages of both materials. The properties of hybrid MPCM/nanoparticle suspensions were investigated in terms of dispersion stability and thermal conductivity , and the cooling performance of the hybrid suspensions on thermal management of light-emitting diodes (LED) were studied. The experimental results show that the addition of graphene oxide , titanium dioxide (TiO 2 ), and aluminum oxide (Al 2 O 3 ) nanoparticles effectively improved the dispersion stability of the MPCM suspension (MPCMS). The thermal conductivity of the MPCMS was enhanced by the TiO 2 and Al 2 O 3 nanoparticles. The hybrid MPCM/Al 2 O 3 suspensions, which exhibited remarkable improvement in both dispersion stability and thermal conductivity, were applied to an LED thermal management system. The results show that the cooling performance of the hybrid suspensions was enhanced compared with that of the mono suspensions of MPCM or nanoparticles. The optimal concentration of the hybrid suspension was obtained. The effects of inlet temperature of the hybrid suspensions on the cooling performance were studied.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2018
·
IF 3.767
Li Li,Feifei Zhao,Tianyi Zhang,Changli Lü
We developed a simple way to prepare the polymer functionalized N -doping carbon dots (CDs) inspired by the mussel chemistry for white LED application. The N -doping CDs were decorated by catechol-terminated hydrophilic poly(poly(ethylene glycol) methyl ether methacrylate ( PPEGMA) and hydrophobic polystyrene (PS) through Schiff base condensation/Michael addition reaction (CD@PEGMA and CD@PS), which owns two advantages: (1) polymer anchored CDs improved the optical properties of pure CDs; (2) hydrophobic PS could transfer hydrophilic CDs into nonpolar organic solvents to expand the application range of water-soluble CDs. The white-light bulk nanohybrid was obtained via in-situ polymerization of styrene monomers containing CD@PS as blue component and 5-(2-methacryloyl-ethyloxymethyl)-8-quinolinol (MQ) coordinated CdSe/ZnS quantum dots (QDs) as green and red components. The warm white light-emitting diode (WLED) was also fabricated based on the white bulk nanomaterials with CIE coordinate (0.32, 0.31) and the correlated color temperature 6250 K.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Ziqian Lv,Hanyu Xu,Zhiying Wang,Mochen Jia,Yanling Wei,Zuoling Fu
The composite of biocompatible carbon dots (CDs) and lanthanide-based luminescent materials have high research value as a promising multifunctional material, which are ideally suited to information encryption and white LED. However, the aggregation-induced quenching of CDs in the solid state still troubles the synthesis of CDs with other solid luminescent materials. Herein, a facile strategy to fabricate polychromatic nanoplatform KLa(MoO 4 ) 2 : Eu 3+ @CDs by encapsulating CDs on the surface of KLM: Eu 3+ with silicon shell is reported, in which the aggregation-induced quenching of CDs is avoided. Due to the overlapping of Eu-O charge transfer band with CDs excitation band, the red luminescence of Eu 3+ ions and the blue fluorescence of can be emitted simultaneously under 395 nm excitation. By changing the proportion of KLa(MoO 4 ) 2 : Eu 3+ in KLa(MoO 4 ) 2 : Eu 3+ @CDs, the mixture can emit "warm", "neutral", and "cold" white light, which can realize people's demand for indoor lighting requirements. Furthermore, a multi-mode information encryption by selectively triggering the luminescence of CDs or Eu 3+ ions is also designed. All the results suggest that KLa(MoO 4 ) 2 : Eu 3+ @CDs have excellent luminescence properties that can be further investigated and applied in the field of white LEDs and information encryption.
研究领域:
材料科学
·
光学
·
信息加密技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）