DYES AND PIGMENTS
·
2022
·
IF 5.122
Yawen Zhou,Shuai Zhang,Shanggeng Li,Jing Li,Ning Li,Lin Zhang
Carbon dots (CDs) have gained tremendous attention over a wide range from fluorescence sensors to optoelectronic devices . In this context, N, S-codoped carbon dots (MO-CDs) of 2.7 nm were synthesized via a facile hydrothermal method using a single precursor Methyl Orange (MO). Upon excitation at 430 nm, the MO-CDs exhibit a yellow emission with an absolute quantum yield (QY) of 15.3%. In addition, the as-prepared MO-CDs possess excellent resistance to high ion strength , high H 2 O 2 concentration, and UV exposure. Because of their good fluorescence properties, a light-emitting diode (LED) device that emits yellow light was fabricated by mixing MO-CDs and siloxane. Moreover, the electrospun nanofibers with yellow fluorescence were prepared by electrospinning technology. This work shows that the CDs derived from MO possess special fluorescent characteristics, which can be utilized as a multifunctional carbon material.
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
INORGANICA CHIMICA ACTA
·
2021
·
IF 2.545
Tian-Cheng Wu,Qiao-Long Hu,Ting-Hong Huang,Yi-Shun Cui,Dan Zheng,Changyan Ji,Cheng Luo
A series of copper(I) - diimine complexes, [Cu(bdpp)(bpy)]BF 4 ( 1 ), [Cu(bdpp) (pen)]BF 4 ( 2 ), [Cu(bdpp)(damp)]BF 4 ( 3 ), [Cu(bdpp)(pen)]BF 4 ( 4 ) (bdpp = 4,6-bis-(biphenyl phosphino) phenoxazine, bpy = 2,2′-bipyridine, phen = 1,10-Phenanthroline, dmp = 2,9-dimethyl-1,10-phenanthroline, bphen = 4,7-diphenyl-1,10-phenanthroline), have been synthesized and characterized by IR, 1 H NMR, 31 P NMR, XRD and X-ray crystal structure analysis. Structural analysis reveals that each Cu + in 1 – 4 is four-coordinated by two N atoms and two P atoms and adopts a distorted tetrahedral geometry. DFT calculations show that the HOMOs in 1 – 4 are mainly comprised of bdpp and copper d–orbitals, while the LUMOs are mainly dominated by diimine ligands. Calculation of atomic charges indicates that the charges of the central Cu atoms in 1 – 4 are less than + 1, and the diimine ligands may be the key to the metal charge transfer to the coordinated atom. In 1 – 4 , the maximum phosphorescent lifetimes and quantum yields are up to 349 μs and 22%, respectively. Moreover, complex 3 is used for fabricating the LED device, showing a decent performance with the maximum EQE of 11%.
研究领域:
化学
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材料科学
✓ 已验证
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2024
·
IF 3.9
Lihan Deng,Jin Li,Jiachen Chen,Jin He
Nanoporous Al 2 O 3 -SiO 2 glasses were prepared using a sol–gel method. These sintered nanoporous Al 2 O 3 -SiO 2 glasses have a transmittance greater than 85 % and possess high mechanical strength, enabling them to contain and protect RE ions. Owing to the presence of nanopores in nanoporous Al 2 O 3 -SiO 2 glasses, Eu ions can easily enter the nanoporous Al 2 O 3 -SiO 2 glasses via an ex-situ dipping method. After drying at room temperature (RT) and then heating at 400 °C, 600 °C, 800 °C, and 1200 °C, we obtained a series of Eu doped nanoporous Al 2 O 3 -SiO 2 glasses. The thermal reduction process from Eu 3+ ions to Eu 2+ ions can occur at a lower sintering temperature (400 °C), enabling a detailed analysis of the thermal reduction mechanism at both low and high temperatures in detail. Under the conditions where Al 3+ ions are present in the samples that are under calcination, Eu 2+ -doped nanoporous Al 2 O 3 -SiO 2 glasses are more easily obtained at relatively low temperatures. Owing to the adjustable composition of Eu 3+ /Eu 2+ in the nanoporous Al 2 O 3 -SiO 2 glasses, tunable emission from red-orange light to blue-violet light can be achieved in the samples. This new type of transparent Eu-doped NPGs has the advantages of high mechanical strength and good processability and is non-toxic and harmless, thereby showing great potential for use in tunable light sources and LED devices.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2023
·
IF 7
Chenyang Zhan,Haomiao Zhu,Sisi Liang,Yingping Huang,Zihao Wang,Maochun Hong
Weak blue light absorption severely limits the application of Mn2+-activated narrowband green phosphors. Herein, a strategy to improve the absorption of Mn2+-activated phosphors is proposed by selecting a suitable host to achieve a high doping concentration of Mn2+. Specifically, a magnetoplumbite-type compound La0.827Al11.9O19.09 with a unique layered structure is selected as the host to accommodate Mn2+ (La0.827Al11.9−xMnxO19.09,LAO:xMn2+) and a high doping concentration of x = 0.30 is obtained. Upon 450 nm excitation, the prepared phosphor LAO:0.30Mn2+ displays an intense narrowband green emission peaking at 517 nm with a full width at half-maximum (FWHM) of 28 nm, a color purity of 88% and an internal/external quantum yield of 90%/16%. Furthermore, it exhibits a low thermal quenching (6% at 423 K) and negligible color drifting (3.29‰ at 423 K). The LED device fabricated from the green phosphor LAO:0.30Mn2+, the commercial red phosphor K2TiF6:Mn4+ and a blue InGaN chip can emit bright white light with a corresponding correlated color temperature (CCT) of 5464 K and a color gamut value of 124% of the National Television Commission (NTSC) standard. These results indicate that the LAO:0.30Mn2+ phosphor has great potential for usage as a green component in wide-color gamut LCD backlight applications.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
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IF 5.1
Pengyi Ma,Jinping Song,Shutao Li,Xiaoting Guo,Jianhua Xue,Qi Ma
In this research, four CPDs with different solid-state fluorescence were successfully synthesized through a one-step hydrothermal condensation cross-linking carbonization (HCCC) approach employing pyromellitic dianhydride (PMDA) and ethylenediamine (EDA) as the polymerization monomers. It was proposed that there are two competing reaction pathways in the formation stage of polymers, and regulation of reaction conditions can affect this competitive relationship to acquire CPDs with different solid-state fluorescence. The morphology and surface structure of four kinds of CPDs were characterized in detail using several characterization techniques. These four CPDs not only possessed small particle sizes of 1.83–2.36 nm, but also exhibited excellent fluorescence stability. Results displayed that CPDs-1, CPDs-2, CPDs-3, and CPDs-4 solid powders exhibited fluorescent yellow, yellow, brownish-yellow, and brown fluorescence under 365 nm UV lamp, which could fabricate fluorescent films and apply in LED devices. Interestingly, it was noticed that the modulation of the content of CPDs in CPDs/PVA composite films or the surface of LED chips could greatly adjust the color of composite film and LED light emission. In sensing studies, CPDs-2 could serve as fluorescence probe to construct a sensitive and selective sensor for the detection of luteolin, the linear range was 0–100 µM and the detection limit was 30 nmol/L. In practical sample analysis, the recovery rate and the RSD were 94.96 %–107 % and 0.54 %–3.52 %, respectively. In addition, CPDs-3 was used to construct a fluorescence sensing platform for the detection of water in the range of 0 % to 90 %. Moreover, as a potential nano-fluorescent probe, CPDs-2 showed low cytotoxicity and good biocompatibility in cancer cell imaging research and plant seed growth processes.
研究领域:
材料科学
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分析化学
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生物医学工程
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植物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Yaoyu Liu,Zongshuai Ji,Tianyu Wang,Guanfeng Liu,Shuai Zhang,Xin Ding,Bing Teng,Shaohua Ji
CsMnX 3 (X = Cl, Br, I) metal halide materials are prone to dissociation in the atmosphere due to the hygroscopic nature of cesium halide (CsX) and manganese halide (MnX 2 ). Addressing this challenge, a novel strategy for synthesizing large bulk of CsMnCl 3 ·2H 2 O single crystals (SCs) using an anti-solvent-assisted method was presented. Importantly, the SCs have a sheet shape with dimensions of 22 mm × 9 mm × 2 mm, and demonstrate superior crystallinity and strong red emission at 630 nm. Furthermore, the electron localization function (ELF) diagram demonstrates that the robust electronegativity of O element, enhancing the thermal stability of the octahedral structure. Meanwhile, the crystals retained 85 % of their original value even after 90 days in an atmospheric environment. In addition, red light-emitting devices (LEDs) were fabricated using the CsMnCl 3 ·2H 2 O single crystals , which shows the voltage, and Commission Internationale de lEclairage (CIE) color coordinates remained superior stable when the current changed from 100 to 200 mA. Thus, the excellent stability of CsMnCl 3 ·2H 2 O can promote its practical application in optoelectronics .
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Chenfei Wang,Canyun Zhang,Fengchao Wang,Jin Chen,Enliang Ren,Jinfang Kong,Lan Li,Jiayue Xu,Yan Zhang
All-inorganic lead halide perovskite nanocrystals (NCs) have attracted enormous attention owing to their excellent optical properties such as ultrahigh photoluminescence quantum yield (PLQY), narrow full width at half maximum (FWHM) and broad emission spectra tunability. In this study, we reported the synthesis of colloidal perovskite NCs based on CsPbBr 3 @Cs 4 PbBr 6 composite structure. With the assistance of Tetraoctylammonium bromide (TOAB) ligands, the prepared CsPbBr 3 @Cs 4 PbBr 6 NCs show high PLQY of 94.7% and enhanced stability. The crystal morphology and phase structure of the CsPbBr 3 @Cs 4 PbBr 6 NCs were investigated by HRTEM and XRD measurements. In addition, the crystal morphology of CsPbBr 3 @Cs 4 PbBr 6 NCs presents cubic and circular particles with an average size of 9.3 nm. Compared with CsPbBr 3 NCs, the diphase CsPbBr 3 @Cs 4 PbBr 6 composite materials can perform higher optical properties due to the in-situ passivation of the generated Cs 4 PbBr 6 NCs. Furthermore, the fabricated LED device exhibits bright white light emission with a color coordinate of (0.335, 0.337), the corresponding color temperature of 5390 K and a color rendering index of 82.1 under the injection current of 30 mA. These results demonstrate that the obtained CsPbBr 3 @Cs 4 PbBr 6 NCs have a potential application in white light-emitting and display devices.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 12
·5553-5561
·
IF 3.5
Long Chen,Jiyou Zhong,Jiajun Wu,Weiren Zhao
Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) are considered as next-generation of NIR light sources for spectroscopy. However, it is still a challenge to develop an inexpensive broadband NIR phosphor with relatively long-wavelength (λem > 800 nm) emission. In this work, an octahedral Al3+-containing pyrophosphate Al0.5Ta0.5P2O7 with a cubic structure was chosen as a host for Cr3+. Synthesizing this material indicates that this phosphor exhibits a broadband NIR emission peaking at 850 nm with a full width at half maximum (FWHM) of 155 nm under 465 nm excitation. The crystal structure, morphology, local structure, and photoluminescence properties of this material were investigated in detail. The results revealed a full understanding of this new material. A NIR pc-LED device fabricated by using this material combined with a 450 nm LED chip generates a NIR output power of 10.7 mW and a NIR photoelectric conversion efficiency of 3.4% under a 100 mA driving current, which shows the possibility of this material to be utilized in NIR pc-LED applications. Moreover, this material exhibits a linear relationship between emission intensity, decay time and temperature in a wide temperature range, implying that excellent multi-model temperature sensing applications can be expected.
研究领域:
材料科学
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光电子学
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无机化学
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固体物理
·
传感器技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Yao Li,Qingxing Yang,Huwei Li,Xinyu Fu,Hongxia Yue,Zheyu Li,Jing Feng,Hongjie Zhang
Metal halide double perovskites are a promising alternative to lead-based perovskites. Especially, rare earth (RE)-based halide double perovskites have attracted much attention due to their unique optical properties. As RE3+ ions could be served not only as the component of the matrix but also as the luminescence centers, the chemical composition of RE-based halide double perovskites can be simplified and tunable luminescence could be achieved. In this work, Cs2NaRECl6 (RE = Tb, Eu) halide double perovskite nanocrystals were synthesized by the hot injection method. Cs2NaRECl6 nanocrystals exhibit not only the intrinsic host emission but also the characteristic emissions of RE3+ ions. Furthermore, the excitation-wavelength-dependent multicolor emissions of Cs2NaRECl6 nanocrystals make them highly potential for anticounterfeiting applications. Multicolor LED devices based on various components of Cs2NaRECl6 could be obtained, providing promising candidates for optoelectronic 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
OPTICS EXPRESS
·
2024
·Vol. 32
·期 14
·25023-25035
·
IF 3.2
Jinxiao Hu,Shuyi Ning,Chaoqi Hao,Zheng Ren,Cong Li,Fenghe Wang,Guoyi Dong,Gang Yue,Li Guan,Li Guan,Xu Li,Xu Li,Zhenyang Liu,Zhenyang Liu
All-inorganic lead halide perovskite nanocrystals (NCs) have excellent optoelectronic properties and promising applications. Improving the stability of inorganic halide NCs and optimizing their photoluminescence quantum yields (PLQY) has become an urgent task. Constructing core-shell structures is an effective method to improve the environmental stability and PLQY, however, realizing core-shell structured perovskite NCs with good dispersion and multiple perovskites encapsulated within the shell material remains challenging. In this work, CdS shells were grown on the surface of CsPbBr3 NCs by ion-exchange method utilizing perovskite NCs with their ionic properties, and the effectiveness of the surface shell protection is reflected in its enhancement of long-term storage stability, storage stability in water, and thermal stability of NCs. In addition, the PLQY and exciton binding energies of CsPbBr3/CdS NCs are increased. Finally, the NCs were packaged into green emitting LED devices and performed high stability. The results will facilitate the further commercialization of all-inorganic lead halide perovskite materials for optoelectronic devices.
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
·
2022
·
IF 9.965
Yue Su,Lifang Yuan,Bo Wang,Sijian Wu,Yahong Jin
Metal halide perovskites (MHPs) have sparked ongoing research interest due to their high-performance optoelectronic properties. However, blue-light excitable near-infrared (NIR) emitting MHPs is still inaccessible and the achievement of robust thermal-quenching resistance so far remains a huge challenge. In this work, we report on the synthesis of lead-free all-inorganic Mn 2+ -based perovskite-like single crystals using the designed nonstoichiometric precursor ratio. The special crystal structure endows Mn 2+ with efficient blue light excitation and red emission, which enables the capabilities of a good matching with commercial blue LED chips and an efficient sensitization for Ln 3+ emitters. The incorporations of Yb 3+ , Er 3+ , and Ho 3+ functionalize the CsMnCl 3 single crystals with multiple NIR emissions by virtue of feeding the energy from Mn 2+ to Ln 3+ via multi-channels. Most remarkable is the achievement of the robust thermal-quenching resistance, exhibiting (near-) zero-thermal-quenching and even anti-thermal quenching, of the Ln 3+ NIR emissions above room temperature . Finally, as a proof-of-concept study, a prototype of an NIR-LED device was fabricated. This work not only provides a general strategy to unlock the blue-light excitable NIR emission from f-f transitions of Ln 3+ ions, and a fundamental understanding of the sensitization-activation mechanisms in Ln 3+ -functionalized manganese (Ⅱ)-based perovskite-like phosphor, but also endows the MHPs with optical functionalities for the future high-potential applications, such as NIR phosphor-converted LEDs, and optical telecommunication.
研究领域:
材料科学
·
光电学
·
光子学
·
固体物理
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无机化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Qinan Mao,Gan Li,Xinyu Shen,Junhua Xi,Lang Pei,Xinyue Li,Jiasong Zhong
Currently, Mn 4+ -activated phosphors have attracted extensive attention for their versatile applications in general lighting, display and plant cultivation. Owing to 3d 3 electronic configuration of Mn 4+ ion, modifying its local coordination environment emerges as a potent method to tailor its luminescence behavior. Herein, a heterovalent substitution strategy is reported to greatly enhance the photoluminescence (PL) of Ba 2 CaWO 6 :Mn 4+ . The effects of the substitution of rare-earth ions (Ln 3+ = Lu 3+ , Y 3+ , Gd 3+ , La 3+ ) for Ca 2+ ions on the PL properties of the phosphor are studied in detail. The PL spectral change of Mn 4+ induced by Ln 3+ substitution is clarified in terms of the local structure of [WO 6 ] octahedron and the valence state of Mn. By selection of Ln 3+ ions and optimization of Ln 3+ doping concentration, the emission intensity of Ba 2 Ca 0.85 Gd 0.15 WO 6 :0.25Mn 4+ phosphor reaches up to 46.3 times as that of Ba 2 CaWO 6 :0.25Mn 4+ . Besides, the Ba 2 Ca 0.85 Gd 0.15 WO 6 :0.25Mn 4+ phosphor exhibits an internal quantum yield of 56.9 % and a thermal stability of 72.6 %@423 K. Finally, Ba 2 Ca 0.85 Ln 0.15 WO 6 :Mn 4+ based phosphor conversion LED devices are demonstrated, which can be potentially employed for indoor plant lighting.
研究领域:
材料科学
·
光电技术
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照明技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）