APPLIED ENERGY
·
2024
·
IF 10.1
Jiurong Li,Wenjing Li,Hangxiang Wang,Xiujian Zhao,Xiao Gong
Aggregation-caused quenching (ACQ) is a great obstacle for carbon dots (CDs) to be applied in the photovoltaic fields. In this work, we report that acid-catalyzed hydrolytic condensation of N-[3-(trimethoxysilyl)propyl]ethylenediamine (KH-792) is utilized to generate organosilicon matrices, meanwhile, CDs are covalently linked to the organosilicon matrices to realize solid-state fluorescence via one-step solvothermal method. This approach enables CDs to be uniformly distributed in the organosilicon matrices to produce strong solid-state fluorescence. Most importantly, the obtained blue fluorescent CDs (b-CDs) can be combined with (3-Aminopropyl)triethoxysilane (APTES) to form a highly transparent optical waveguide film on the glass to construct high-performance luminescent solar concentrators (LSCs) with high loading amount. By changing the CDs loading amounts and volume of the coating solution, the transparent LSCs (5 × 5 × 0.2 cm 3 ) with high optical conversion efficiency ( η opt ) of 2.83% can be achieved. In addition, the b-CDs powder can be intergrated with 365 nm chips to successfully fabricate monochromatic light-emitting diodes (LEDs). The prepared b-CDs powder with strong solid-state fluorescence shows great potential in photoelectric devices.
研究领域:
材料科学
·
光电技术
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ruoyu Dai,Xipao Chen,Ning Ouyang,Yaoping Hu
Carbon dots (CDs) with tunable photoluminescence (PL), especially with long wavelength PL , offer great potential for various applications including sensing, bioimaging, photomedicine, and optoelectronic devices. Here, we use 2,3-diaminopyridine as a single precursor to synthesize colorful CDs in different pH conditions. By simply regulating the reaction media from alkali to neutral to acid, bright CDs emitting violet, green, and orange fluorescence are prepared, respectively. Detailed characterizations reveal that the red-shift of PL is caused by the growing size of sp 2 conjugated domain and increasing content of graphite nitrogen. We embed CDs in starch to suppress self-quenching and enhance the PL quantum yields. The CD/starch composites, possessing efficient solid-state fluorescence, can be coated on the ultraviolet chips (365 nm) to fabricate multicolor light-emitting diodes toward indoor illumination. This work presents a new strategy to adjust the PL wavelength of CDs in a wide range, and clarifies the emission mechanism.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2019
·Vol. 7
·期 21
·1900775
·
IF 7.125
Qianyi Guo,Minchen Wei,Zekun Zheng,Xiongjian Huang,Xiaoqian Song,Shao-Bin Qiu,Xiao-bao Yang,Xiaofeng Liu,Jianrong Qiu,Guoping Dong
Polymeric g-C 3 N 4 with controllable photoluminescence emission wavelength in the whole visible light range (450–650 nm) is synthesized through the one-step molecular doping during the thermal condensation process of g-C 3 N 4 conjugated framework, which opens up its application beyond the conventional catalysis scopes. By adjusting the doped content of hetero-molecules, the modified g-C 3 N 4 with the optical properties controlled according to the demand of practical applications can be facilely and largely obtained. It overcomes the limitation of the narrow adjusting range of conventional g-C 3 N 4 on optical properties and makes it become more promising for applications in solid-state displays. The corresponding multiple-color g-C 3 N 4 -based LED devices and the white-light LEDs with high quality can be obtained as supported by experiments and theoretical calculations. Moreover, the effect of doped molecule on the π-conjugated system of g-C 3 N 4 is systematically studied here, and the tunable luminescence mechanism is proposed.
研究领域:
材料科学
·
光学工程
·
化学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Xiao Min,Mengzhu Hu,Yaoyao Yang,Bingfa Liu,Yuheng Wu,Yuansheng Wu,Lixin Yu
The effect of fluxes on CaSi 2 O 2 N 2 :Eu 2+ phosphors obtained via conventional solid-state reaction at atmospheric pressure is systematically investigated. The photoluminescence excitation and emission spectra of CaSi 2 O 2 N 2 :Eu 2+ phosphors containing fluxes are investigated and discussed in detail. A strong emission band is observed peaked at 548 nm originating from transitions between 4f 6 5d 1 emitting state and 4f 7 ground state of Eu 2+ under near ultraviolet light (398 nm) excitation. The results show that the best synthesis temperature of the sample is 1450 °C with the absence of combustion aid to obtain single phase of CaSi 2 O 2 N 2 :Eu 2+ . After adding BaF 2 , NH 4 Cl and Na 2 CO 3, single phase samples of CaSi 2 O 2 N 2 :Eu 2+ with well-defined morphology can be successfully prepared at a temperature as low as 1400 °C. It is interesting that in the samples prepared under the assistance of BaF 2 fluxes, the luminous intensity of Eu 2+ is much higher than in the absence of fluxes.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2016
·
IF 2.693
Renping Cao,Dedong Peng,Haidong Xu,Shenhua Jiang,Zhiyang Luo,Hui Ao,Pan Liu
Novel NaAl 11 O 17 :Mn 2+ green phosphor is synthesized by solid-state reaction method in air. The emission band peaking at ~508 nm is observed owing to the 4 T 1 → 6 A 1 ( 6 S) transition of Mn 2+ ion, and the chromaticity coordinates are (0.0725, 0.6468). The excitation band peaking at ~360, 382, 424, 450, and 490 nm are attributed to 6 A 1 ( 6 S)→ 4 E( 4 D), 4 T 2 ( 4 D), [ 4 A 1 ( 4 G), 4 E( 4 G)], 4 T 2 ( 4 G), and 4 T 1 ( 4 G) transitions of Mn 2+ ion, respectively, which indicate that NaAl 11 O 17 :Mn 2+ phosphor may be excited by (near) ultraviolet and blue LED chip. The luminous mechanism is explained by Tanabe–Sugano diagram of Mn 2+ ion. The optimal Mn 2+ doping concentration is ~3.5 mol%. The NaAl 11 O 17 :3.5%Mn 2+ phosphor shows high quantum efficiency of ~67.84% with excitation 424 nm. The lifetime decreases from 6.72 to 6.0 ms with increasing Mn 2+ concentration in the range of 0–4 mol%.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Lijun Gao,Cong Li,Chongzhou Wang,Jing Cui,Liming Zhou,Shaoming Fang
The rare earth complex (Eu(PBA) 3 ) with the active functional group ( OH) was prepared by p -hydroxybenzoic acid (PBA) and europium chloride in the ethanol solution. Then, the photoluminescence polyurethane (Eu(PBA) 3 /PU) materials were synthesized by the reaction of the functional groups on the complex with the isocyanates in the polyurethane reaction system. The content of the complex has great influence on photoluminescence performances of Eu(PBA) 3 /PU materials. The fluorescence intensity increases with the increase of Eu(PBA) 3 content. Especially, the obtained Eu(PBA) 3 /PU materials possess good fluorescence emission purity and a long luminescence lifetime , which have potential applications in optical display instruments.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
J. Jia,W. Lu,S. Cui,C. Dong,S. Shuang
A novel approach for fabricating color-adjustable carbon dots (CDs) is proposed via hydrothermal treatment of p- aminobenzenesulfonic acid and o- , m- , or p- phenylenediamines, respectively. The as-synthesized CDs can emit blue, green, and orange fluorescence and are named b-CDs, g-CDs, and o-CDs, respectively. All of them have strict excitation independence and excellent photostability. Variations of photoluminescence emitting them are attributed to the difference in their particle size, the degree of oxidation , and the content of N-related states on their surface. Furthermore, these multicolor CDs have been used as fluorescents inks, which perform well in anti-counterfeiting and information security.
研究领域:
材料科学
·
纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Zhiwu Liu,Yanfeng Ding,Chaocan Zheng Yuan Meng,Jing Tang,Qianping Qiu
Nowadays, exploring new photonic materials that can efficiently convert the invisible light into the visible light have attracted tremendous attention in the catalytic field. Here, we design and prepare a kind of Bi 3+ doped Lu 2 CaGeO 6 phosphor by using the solid-state reaction at 1250 °C in air for 5 h. The structural analysis, which is based mainly on the powder X-ray diffraction (XRD) spectra, shows that the as-prepared Bi 3+ doped Lu 2 CaGeO 6 phosphors belong to a trigonal structure with a space group of R 3 (No. 146). The photoluminescence (PL) results reveal that changing the excitation wavelengths from 240 nm to 340 nm does not change the emission sharp and position of the Bi 3+ doped samples, allowing the maximum emission intensity to keep at 420 nm. Except for the fluorescence, up exposure to the UV light ( e.g. , 254 nm), the Lu 2 CaGeO 6 :Bi 3+ phosphors can also exhibit the Bi 3+ -related blue afterglow luminescence. The longest afterglow duration that corresponds to the 1.5%Bi 3+ doping content in the Lu 2 CaGeO 6 crystal host can last 30 min in the dark. After comparing the Bi 3+ -related blue afterglow band to the band gap of TiO 2 semiconductor that corresponds to the wavelength of 387 nm, it clearly indicates us that the Bi 3+ doped Lu 2 CaGeO 6 phosphors can serve as a continous excitation source for light-sensitive TiO 2 semiconductor for photocatalysis application.
研究领域:
材料科学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Mengmeng Zhu,Yuexiao Pan,Mingmei Wu,Hongzhou Lian,Jun Lin
A red phosphor with a broad excitation band in blue region and sharp emission peaks in red region is needed for compensating the red components of white light-emitting diodes (WLEDs) by converting blue light with a yellow phosphor Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce). The red phosphor LiSrAlF 6 :Mn 4+ (LSAF:Mn) with morphology of flaky particles about 50 μm in diameter has been synthesized by an ion-exchange reaction route at room-temperature in air. The as-synthesized phosphors were characterized by x-ray powder diffraction (XRD), scanning electron microscope (SEM), and temperature-dependent photoluminescence (PL) spectra. The excitation spectrum of LSAF:Mn shows a broad-band excitation from 400 to 500 nm that is due to the spin-allowed transition of 4 A 2g → 4 T 2g of Mn 4+ , indicating a potential application for solid state lighting. The optimal PL intensity of the phosphor LSAF:Mn has been obtained by optimizing the synthetic parameters.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 17
·2200836
·
IF 10.05
Hexin Chen,Tuan Lin,Fan Huang,Shuxing Li,Xueyuan Tang,Rong-Jun Xie
Green light is generally used as the transmitter of underwater wireless optical communication (UWOC) system, but the currently available light-emitting diode (LED)-based green light has a poor luminous flux density (i.e., low brightness) and a low wall-plug efficiency (WPE), known as the “green gap”. In this work, it is proposed to produce the laser-driven green light by using blue laser diodes to pump the narrow-band green-emitting β-Sialon phosphor-in-glass (PiG) film. The dominant wavelength of the laser-driven green light can be tuned in the range of ≈520–540 nm, required for UWOC, by controlling the phosphor content at ≈60–80% and the film thickness at ≈150–185 µm. By introducing highly reflective TiO 2 into the PiG film, the laser-driven green light exhibits a maximum luminous flux density of 1260 lm mm −2 under blue laser excitation with a power density of 15.49 W mm −2 . For UWOC application, the green light is demonstrated to have a modulation bandwidth of 1.76 MHz, a high WPE of 8.7%, and a long transmission distance of ≈61.6 m. This work suggests that the laser-driven high-brightness green light will be a promising light source for UWOC.
研究领域:
光学
·
通信工程
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2022
·Vol. 14
·期 41
·4122-4126
·
IF 3.532
Mingming Yan,Minglu Li,Dongning Wang,Huifang Chen
A rapid method for the determination of ethanol content is proposed and tested. A fluorescence detecting system, with a multimode fiber (MMF) sensing head, is employed. Rhodamine 6G (R6G) is applied as the fluorescent indicator. In the R6G aqueous solution, the molecules aggregate at high concentration, causing fluorescence quenching. Nevertheless, aggregation and quenching rarely occur in ethanol. Taking an ethanol and water mixture as the solvent, the photoluminescence (PL) intensity reflects the aggregation degree and the ethanol content. Based on this phenomenon, the contents of the ethanol–water mixture were measured through PL intensity detection. A limit of detection (LOD) at ∼0.1 vol% level was obtained in the range of 0–100%. Commercial Chinese baijiu and rubbing alcohol were tested and the results obtained were consistent with the label values. The detecting system is compact and of low-cost, and the detecting method is rapid, accurate and repeatable. There is good prospect of applications for the determination of ethanol content on-site.
研究领域:
分析化学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Xi Zhang,Song Qing,Yi Qin,Qiang Zhou,Jing Wan,Huaijun Tang,Zhenglian Wang
Searching for efficient Mn 4+ red phosphors for white lighting and display backlighting has drawn great attention. In this work, an efficient Mn 4+ -doped fluoroscandate, Rb 2 KScF 6 :Mn 4+ , with short fluorescence lifetime is prepared via a facile co-precipitation method. It was found that the nonequivalent occupation of Mn 4+ for Sc 3+ leads to the identifications of sharp red emissions, enhanced zero-phonon line, high quantum efficiency and short fluorescence lifetime upon blue light excitation. Thanks to the luminescent properties, good optical parameters of high color rendering index, low correlated color temperature, and acceptable color gamut were achieved by coating the red Rb 2 KScF 6 :Mn 4+ phosphor with yellow Y 3 Al 5 O 12 :Ce 3+ or green β -SiAlON:Eu 2+ phosphor in various white light-emitting diodes, demonstrating its potential role for white light illumination and backlight display applications.
研究领域:
材料科学
·
光学
✓ 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）