JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 47
·21882-21894
·
IF 3.5
Hu Hao,Zhao Xia,Mao Xiang,Dong Yongrun,Li Wen,Xue Jinkun,Li Zequan,Gao Wei
White light-emitting diodes (WLEDs), as strong contenders for future solid-state light sources, hold significant promise in solid-state lighting due to their high efficiency, low power consumption, self-emission, and versatility. Carbon dots (CDs), a novel type of carbon nanomaterials, exhibit excellent luminescence properties. However, their intricate structure and unclear fluorescence mechanism hinder long-wavelength modulation, and solid-state aggregation leads to luminescence quenching, limiting their application in optoelectronic devices. This study focuses on the preparation of CDs with dual yellow–green emission peaks via a hydrothermal method using sodium lignosulfonate as a carbon source. The mechanism behind the dual emission is elucidated by analyzing the morphology and chemical composition of the CDs. Specifically, the green light originates from surface-related states due to N doping, while the yellow light results from the carbon-core state at higher hydrothermal temperatures. By incorporating these CDs into transparent wood, a material capable of emitting white light under blue light excitation is achieved. This transparent wood was successfully applied in the fabrication of WLEDs, providing valuable insights into CDs modulation and their utilization for white light solid-state lighting 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
Small
·
2023
·Vol. 19
·期 45
·2303247
·
IF 13.3
Yuhe Bi,Sheng Cao,Peng Yu,Zhentao Du,Yunjun Wang,Jinju Zheng,Bingsuo Zou,Jialong Zhao
High color purity blue quantum dot light-emitting diodes (QLEDs) have great potential applications in the field of ultra-high-definition display. However, the realization of eco-friendly pure-blue QLEDs with a narrow emission linewidth for high color purity remains a significant challenge. Herein, a strategy for fabricating high color purity and efficient pure-blue QLEDs based on ZnSeTe/ZnSe/ZnS quantum dots (QDs) is presented. It is found that by finely controlling the internal ZnSe shell thickness of the QDs, the emission linewidth can be narrowed by reducing the exciton-longitudinal optical phonon coupling and trap states in the QDs. Additionally, the regulation of the QD shell thickness can suppress the Förster energy transfer between QDs in the QLED emission layer, which will help to reduce the emission linewidth of the device. As a result, the fabricated pure-blue (452 nm) ZnSeTe QLED with ultra-narrow electroluminescence linewidth (22 nm) exhibit high color purity with the Commission Internationale de l'Eclairage chromatic coordinates of (0.148, 0.042) and considerable external quantum efficiency (18%). This work provides a demonstration of the preparation of pure-blue eco-friendly QLEDs with both high color purity and efficiency, and it is believed that it will accelerate the application process of eco-friendly QLEDs in ultra-high-definition displays.
研究领域:
材料科学
·
光电技术
·
纳米科技
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2022
·Vol. 14
·期 41
·15451-15461
·
IF 8.307
Huimin Jiang,Ruoping Wang,Qian Zhang,Liang Song,Xia Sun,Junpeng Shi,Yun Zhang
Persistent luminescence nanoparticles (PLNPs) possess advantages for high-sensitivity bioimaging and continuous photodynamic therapy (PDT) because they can emit persistent luminescence (PerL) after excitation ceases. However, PLNPs are limited to single-wavelength emission, which can only efficiently realize one of the functions of bioimaging or PDT. In addition, most PLNPs are excited by shallow tissue penetrating excitation light, which makes it difficult to achieve repeatable in vivo applications with high efficiency. Herein, X-ray-excited PLNPs (Zn3Ga2Ge2O10:Cr3+,Mn2+, ZGGCM) with dual emission for in vivo X-rays repeatedly activated PerL imaging and tumor PDT are reported for the first time. ZGGCM exhibits dual-emission peaks after X-ray excitation/re-excitation, located at 698 nm and 532 nm, respectively. Additionally, ZGGCM is modified with the photosensitizer rose bengal (RB) to construct a dual-functional nanoplatform based on PerL imaging and PDT. The results indicate that the PerL emission peak (698 nm) of Cr3+ ions in ZGGCM possesses excellent near-infrared (NIR) PerL imaging performance, and the green PerL emission peak (532 nm) of Mn2+ ions can activate RB effectively and generate reactive oxygen species (ROS), thereby causing a significant antitumor effect. This unique dual-functional nanoplatform is expected to further promote the application of PLNPs in the integration of efficient tumor diagnosis and treatment.
研究领域:
生物医学工程
·
肿瘤学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Jian-Peng Qin,Chun-Yang Pan
The toxicity of lead limits the commercial application of lead-based perovskites . Replacing lead with an environment-friendly metal is an excellent alternative strategy. Bi 3+ is an interesting choice being that it has satisfactory biological security and similar electron configuration to Pb 2+ . Series of hybrid Bi 3+ perovskites, (H 2 DMAPA)BiBr 5 ( 1 ), (H 2 DMAPA)BiBr 2 I 3 ( 2 ), (H 2 DMAPA) 2 AgBiBr 8 ( 3 ) and (H 2 EP) 2 AgBiBr 8 ( 4 ) were successfully prepared in this work. Their band gaps are 2.65, 2.21, 2.58 and 2.33 eV, respectively. The excitation wavelengths of 1 , 2 , 3 and 4 are 440, 355, 365 and 400 nm, and the corresponding PL emission peaks are located at 480, 580, 493 and 467 nm, respectively.
研究领域:
材料科学
·
光电
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2023
·Vol. 10
·期 11
·116202
·
IF 2.3
Yifan Yang,Yongqi Zhu,Shuang Wu,Xinyue Li,Qinan Mao,Yifan Chen,Jiasong Zhong,Yiwen Zhu
In this study, a series of near-infrared (NIR) KZnF3:Cr3+ phosphors was prepared by different chromium sources using a HF-free hydrothermal method. The influence of different chromium sources on the crystal structure, morphology, and luminescence properties of Cr3+-doped KZnF3 phosphors were systematically investigated. The results showed that the chromium source changed from CrF3·xH2O to (NH4)3CrF6 and leaded to an increased crystal field, resulting in a blue shift of the emission peak position from 803 nm to 753 nm, accompanied by the full-width half maximum (FWHM) reduced from 140 nm to 122 nm. Moreover, KZnF3:0.03Cr3+ (CrF3·xH2O) and KZnF3:0.03Cr3+ ((NH4)3CrF6) phosphors maintained 58% and 87% of their initial room-temperature intensity at 423 K, respectively. These results indicated that altering the synthetic raw materials provided new insights for designing NIR phosphors with highly thermal stability.
研究领域:
材料科学
·
光学材料
·
荧光粉技术
·
发光材料
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Wenzhi Wang,Shuo Song,Jinkai Li,Bingqiang Cao,Zongming Liu
Halide perovskite quantum dots (QDs) have been considered to be a potential emitting materials for illumination and display applications. Unfortunately, the toxicity and poor stability can greatly limit their practical application. Herein, the Mn 2+ -doped CsPbCl 3 and SiO 2 -coated Cs(Pb,Mn)Cl 3 perovskite QDs have been developed to solve the tricky problem without affecting their optical properties . Firstly, the mono-dispersed pure CsPbCl 3 perovskite QDs with cubic morphologies are prepared by using a modified hot-injection method, as a control group. Next, the low-Pb content Cs(Pb,Mn)Cl 3 perovskite QDs with distinctive dual emission peaks has been successfully obtained, including the CsPbCl 3 host emission and the Mn 2+ emission. Based on this, a new strategy for synthesizing single Cs(Pb,Mn)Cl 3 @SiO 2 core-shell QDs with their initial cubic morphology and optical properties has been developed, which using the Cs(Pb,Mn)Cl 3 nanoparticles as a precursor and choosing the APTES as the surface ligand. Photo-stability tests indicate that the Cs(Pb,Mn)Cl 3 and Cs(Pb,Mn)Cl 3 @SiO 2 perovskite QDs are markedly more stable than the pure CsPbCl 3 QDs, indicating that the crystal engineering and host packaging are all effective way to improve the stability. Meanwhile, the PL intensity of Cs(Pb,Mn)Cl 3 @SiO 2 dispersed in a mixed solution of toluene and water can retained 63% of the initial value even after 14 h, which are much higher than Cs(Pb,Mn)Cl 3 (31%). Therefore, the Cs(Pb,Mn)Cl 3 after SiO 2 coating is the more effective way to improve stability than that of the Mn 2+ doping. This work not only provides a simple and reliable synthesis way to synthesize the single core-shell particles, which can be suitable for other perovskite systems, but also compares the two methods of the crystal engineering and the host packaging to improve the stability of perovskite QDs for practical application.
研究领域:
材料科学
·
纳米技术
·
光电技术
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2021
·Vol. 9
·期 11
·2002130
·
IF 9.926
Qinggang Zhang,Weilin Zheng,Qun Wan,Mingming Liu,Xiuping Feng,Long Kong,Liang Li
For the display applications of perovskite nanocrystals (NCs), the photoluminescence quantum yield (PLQY), emission linewidth, and operational stability are the main parameters that directly affect the performance of the optoelectronic device. High-temperature solid-state synthesis has been regarded as an eco-friendlier process to prepare perovskite NCs than colloidal synthesis. However, it is relatively difficult to control the sizes and size distribution of NCs at high temperatures, which usually results in a lower PLQY and wider emission. Here, highly stable CsPbBr 3 NCs with a high PLQY up to 93% and a narrow emission linewidth of 18 nm are successfully prepared by a hard-template solid-state synthesis at high temperature (600 °C). It is found that the precisely confined growth of NCs in the thermally stable and uniform pores of the mesoporous silica (MS) template is the main reason to achieve the high PLQY and narrow emission, and the pre-hydrolysis sealing strategy contributes to the exceptional stability. More surprisingly, the emission peak intensity of CsPbBr 3 /MS@SiO 2 is 3.8 times higher than that of the commercialized silicate green phosphor when encapsulated on the blue-chip with the same absorbance at 450 nm, which makes it an ideal down-conversion emitter for display applications.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Transactions of the Indian Ceramic Society
·
2020
·
IF 0.952
Shifa Wang,Huajing Gao,Hong Yu,Peiying Li,Yanwu Li,Chaoli Chen,Yong Wang,Liang Yang,Zijuan Yin
MgAl2O4:M (M = Ti, Mn, Co, Ni) phosphors were successfully prepared by a modified polyacrylamide gel method. Calcination temperature and metal particle has significant effects on the phase transition, optical and color properties of Mg Al2O4: M phosphors. Ti, M n, Co and Ni metal particles introduced into the MgAl2O4 system can produce a variety of colours from white, grayish black, blue to turquoise blue. Mn, Co and Ni metal particles added into MgAl2O4 system can extend their light absorption to visible light range, while the Ti metal particles clad into the system did not improve significantly. Co metal particles appended into the MgAl2O4 system can cause fluorescence quenching of emission peak at 395 nm and enhancement of emission peak at 405 nm, while the Ti and Mn metal particles infused into the system can bring the enhancement of visible emission peak at 425 nm. The fluorescence quenching of the peak at 395 nm can be ascribed to the wavelength of Co metal particles matching the surface plasmon absorbance band of MgAl2O4:M phosphor. A reduction in emission intensity at 425 nm can be assigned to electron transfer from the conduction band (CB) of MgAl2O4 to the CB of metal particles causing non-radiative decay.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
DOI
高影响因子
TALANTA
·
2022
·
IF 6.556
Lin Yuan,Lizhen Liu,Yunfeng Bai,Jun Qin,Meng Chen,Feng Feng
In this article, we report for the first time the use of a dual-emission carbon dots (CDs) with orange-yellow fluorescence for the detection of l -glutamic acid (L-Glu). The CDs was synthesized through a facile strategy of one-pot hydrothermal route using o -phenylenediamine (oPD) and oxalic acid . The CDs exhibit two fluorescence emission peaks around 453 nm and 560 nm when the excitation wavelength is at 390 nm. In the existence of L-Glu the fluorescence at 560 nm was decreased, whereas the fluorescence at 453 nm was constant. The fluorescence intensity ratio at 560 nm and 453 nm (F 560 /F 453 ) expressed two great linear relationships in the L-Glu concentration range from 0 to 200 μM and 200–400 μM, respectively, with a detection limit (LOD) of about 0.085 μM. In addition, it was used to analyze L-Glu in fetal bovine serum samples successfully, which recoveries were ranging from 97.07 to 103.7%. Those results demonstrate CDs can be further explored in biomedicine studies.
研究领域:
分析化学
·
生物医学工程
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Linyuan Lian,Moyan Zheng,Peng Zhang,Zhi Zheng,Kang Du,Wen Lei,Jianbo Gao,Guangda Niu,Daoli Zhang,Tianyou Zhai,Shengye Jin,Jiang Tang,Xiuwen Zhang,Jianbing Zhang
Self-trapped excitons (STEs) in metal halide materials are attracting an increasing level of interest due to their unique light emission properties. Light emission from STEs in metal halides is usually associated with excited-state structural deformation, which lowers the symmetry of local structures, as seen for the STEs in a wide range of materials systems. Here, we reveal a prototypic STE-associated structural “distortion” that, however, enhances the symmetry of local structures, in a series of all-inorganic copper(I)-based halides Cs3Cu2X5 (X = Cl, Br, or I). We further find that the emission peaks of Cs3Cu2X5 blue-shift when the halogen changes from Cl to Br to I, which is the opposite of the trends found in traditional halide perovskites. This phenomenon is attributed to a synergetic combination of the significant change in band gap associated with structural deformation and a strong excitonic effect. Due to the highly localized electron and hole upon photoexcitation, Cs3Cu2Cl5 shows an extremely long and temperature-sensitive photoluminescence (PL) lifetime among metal halide materials with STEs. Remarkably, strong green emission with a PL quantum yield exceeding 90% is found in Cs3Cu2Cl5, opening the way to designing light emission compounds based on local symmetry-enhancing STE mechanisms.
研究领域:
材料科学
·
光电学
·
光物理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD PROCESS ENGINEERING
·
2020
·Vol. 43
·期 7
·e13419
·
IF 1.703
Qingyi Wei,Ting Liu,Hongbin Pu,Da-Wen Sun
Tea polyphenols (TPs) are a major functional ingredient in tea, but current traditional detection methods for TPs are generally time-consuming and involve a lot of organic chemicals. In this study, carbon dots (CDs) with a high quantum yield of 73.66% was prepared using a rapid, safe, and economical way. The synthesized CDs had an average particle size of 5 nm in diameter and showed a strong emission peak at 445 nm when the excitation wavelength was 350 nm. Additionally, a fluorescent CDs/Cu 2+ probe was employed for detection of TPs. This fluorescent sensing approach allowed for detecting TPs in the range between 1 and 30 μg/mL with a low detection limit of 0.31 μg/mL. Besides, satisfactory recoveries of 101.11–106.97% in spiked real tea samples were obtained by this present probe. The outcomes confirmed the applicability of the fluorescent CDs/Cu 2+ probe for TPs measurements in spiked real samples. Moreover, as compared with the standard Folin–Ciocalteu method, the probe was facile and time-saving for the detection of TPs. Therefore, it is hoped that this effective way could also be employed to quantify phenolic compounds from other herbal plants in future studies. Practical Applications In this paper, low toxicity, low cost, simple synthetic, and water solubility of carbon dots (CDs) coupled with Cu 2+ was applied as a fluorescent probe to detect TPs. Compared with the traditional method, good applicability was shown with the proposed method for TPs measurements in real tea samples, indicating great potential for monitoring the content of TPs in tea. In the future, it could provide a sensitive and effective way of detecting phenolic compounds from other herbal plants for the industry.
研究领域:
分析化学
·
材料科学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Shihui He,Shiqiang Hao,Jiawei Lin,Na Wang,Jindong Cao,Zhongnan Guo,Christopher Wolverton,Jing Zhao,Quanlin Liu
The participation of organic cations plays an important role in tuning broad-spectra emissions. Herein, we synthesized a series of Mn(II)-based two-dimensional (2D) halide perovskites with arylamine cations of different lengths having the general formula (C6H5(CH2)xNH3)2MnCl4 (x = 1–4), with the x = 4 compound reported here for the first time. With the increase in the −(CH2)– in organic cations, the distance between adjacent inorganic layers increases, causing the title compounds to exhibit different structural distortions. As the Mn–Cl–Mn angular distortion increases, the experimental optical band gaps of the title compounds increase correspondingly. When the angle distortion between the octahedrons of the compounds is similar, the band gaps may also be affected by the distortion of the octahedron itself (the bond-length distortion of 2 is greater than that of 4). Under UV-light irradiation at 298 K, all of the compounds exhibit two emission peaks centered at 480–505 and 610 nm, corresponding to the organic-cation emission and the 4T1(G) to 6A1(S) radiative transition of Mn2+ ions, respectively. Among these title compounds, (PPA)2MnCl4 [(PPA)+ = C6H5(CH2)3NH3+] exhibits the strongest photoluminescence (PL). The study of the title compounds contributes to an in-depth understanding of the relationship between the structural distortion and optical properties of 2D Mn(II)-based perovskite materials.
研究领域:
材料科学
·
光电学
·
无机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）