Laser & Photonics Reviews
·
2022
·Vol. 17
·期 3
·2200639
·
IF 10.947
Shuyang Bao,Yueyuan Liang,Cong Zhao,Luhan Wang,Xiaojuan Liang,Weidong Xiang
Solid-state white lighting applications with high brightness, low power consumption and long operating life have gradually dominated the modern industrial illumination market. For applications in white light-emitting diodes (WLEDs) and white-lighting laser diodes (WLDs), Phosphor-in-Glass (PiG), owing to its facile process, high efficiency and excellent chromaticity tunability, stands out as an optimal choice among various types of color converters. Currently, research in yellow-emitting Y 3 Al 5 O 12 :Ce 3+ (YAG: Ce) phosphors combined with different glass system has reached a mature stage and the poor illumination is a major bottleneck. Moreover, to realize high-quality white lighting, exploiting full-color PiGs is of great importance for its commercialization. Herein, the multicolour PiGs their successfully obtained by deliberately matching different color-emitting phosphors with the glass matrix. Glass composition selection rules for specific phosphors their proposed based on investigations of glass protection mechanism and the corrosion reaction between phosphors and glass matrix. In addition, an astonishing YAG: Ce PiG phenomenon (zero thermal quenching) is founded and discussed. As for practical applications, high-quality 5-W chip-on-board (COB) WLEDs their constructed by utilizing simple matches of colorful PiGs. Assembled WLDs modules also rendered a high-efficiency and stable lighting source. These results dramatically inspire the development of high-quality solid-state white 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
Applied Materials Today
·
2024
·
IF 7.2
Huajiang Hu,Jiurong Li,Xiao Gong
Due to their unique fluorescence properties and wide range of applications, carbon dots (CDs) have emerged as a prominent research subject. Acid reagents have traditionally been regarded as versatile means to facilitate the carbonization and polymerization of CDs, resulting in increased carbonization and polymerization levels, which in turn cause a redshift in the luminescence of CDs. However, there has been limited investigation into the impact of excess acid reagents on CDs luminescence. In this study, we discovered that the addition of excess acid reagent, in the presence of oxygen-containing functional groups, does not enhance the graphitization of CDs, but rather, it has the opposite effect. Excess acid reagents prevent CDs polymerization and reduce the content of graphite-N in the CDs. Simultaneously, excess acid reagent leads to an increase in oxygen-containing functional groups on the surface of the CDs, resulting in a blueshift in luminescence. Building upon these findings, we have devised a synthesis scheme for full-color CDs that cover nearly the entire visible light spectrum. Furthermore, leveraging the diverse color range, we have also employed these CDs for anti-counterfeiting encryption and LEDs applications.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Applied Materials Today
·
2019
·
IF 8.013
Quan Xu,Wenjing Yang,Yangyang Wen,Shengkun Liu,Zheng Liu,Wee-Jun Ong,Neng Li
Multiple-color emissive MXene quantum dots (MQDs) exhibit vast application prospects in various fields, including optoelectronics, bioimaging, and catalysis. However, the majority of the recent MQDs display limited maximum emission in the blue-light region. Herein, we employ the hydrogen bonds as an adjustment method to prepare novel full-color MQDs using Ti 3 C 2 MXene as the starting material. By doping with sodium thiosulfate and ammonia water (sulfur-doped, nitrogen-doped), the maximum emission of the obtained MQDs demonstrates entire light spectrum covering from blue to orange light. Interestingly, the as-synthesized Ti 3 C 2 MQDs aqueous solutions unveil multiple-color, excitation-independent emission wavelength and fluorescence (lifetime and quantum yield) enhancement compared with in the dry state. The fluorescence shift and enhancement are confirmed by comprehensive spectroscopic techniques (e.g. grazing incidence X-ray diffraction (GIXRD)) and complementary density functional theory (DFT) calculations. The results indicate that the construction of stalwart bridge-like hydrogen-bonded networks between the MQDs by highly ordered bound water on the doped MQDs surface can give rise to the immobilization of the C O and C–O bonds of the MQDs, thus strengthening the rigidity of the entire system. As a benefit of the bandgap emission, white light-emitting diodes (WLEDs) with stable emission color by directly utilizing MQDs as an active emission layer have been realized for the first time. As such, the as-prepared full-color MQDs developed herein can remarkably broaden the prospect of MXene 2D quantum dots (2D-QDs) in a myriad of technological applications such as electronics, batteries, bioimaging, and cancer therapy.
研究领域:
材料科学
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光学
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纳米技术
✓ 已验证
DOI
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 29
·15823-15831
·
IF 6.895
Mingye Sun,Yue Han,Xi Yuan,Pengtao Jing,Lei Zhang,Jialong Zhao,Youjin Zheng
Realizing full-color emission plays a key role in exploring the luminescence mechanisms of carbon dots (CDots) and promoting the applications of CDots in light-emitting diodes (LEDs). Herein, a synthesis strategy for full-color emitting CDots was developed through the solvothermal reaction of citric acid and urea with a constant mass ratio but varying reactant concentrations in solvent. With the reactant concentrations increasing, a dual regulation mechanism including an enhanced nucleation growth process and subsequently increased CO/CN-related surface states should be responsible for the photoluminescence (PL) shift of CDots from blue to red. Relying on the hydrolyzation and condensation processes of 3-aminopropyltrimethoxysilane, a simple and universal method was developed by chemically dispersing the CDots into a cross-linked silica network on the surface of SiO2 nanoparticles to produce efficient full-color emitting SiO2/CDot composite phosphors with considerable PL quantum yields in the range of 30–60%. It was proved that the full-color emitting SiO2/CDot composite phosphors could be flexibly applied in packaging white LEDs, releasing pure white light at the Commission Internationale de L'Eclairage (CIE) coordinates of (0.33, 0.33) with a color rendering index (CRI) of 80.4 and a high color-rendering white light coming entirely from CDots with the CIE coordinates of (0.34, 0.36) and a CRI of 97.4, indicating promising application of the full-color emitting SiO2/CDot composite phosphors in the LED field.
研究领域:
材料科学
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光学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Junjie Wang,Danyang Li,Lan Mu,Miaozi Li,Yu Luo,Binbin Zhang,Chaohuang Mai,Biao Guo,Linfeng Lan,Jian Wang,Hin-Lap Yip,Junbiao Peng
Full-color matrix devices based on perovskite light-emitting diodes (PeLEDs) formed via inkjet printing are increasingly attractive due to their tunable emission, high color purity, and low cost. A key challenge for realizing PeLED matrix devices is achieving high-quality perovskite films with a favorable emission structure via inkjet printing techniques. In this work, a narrow phase distribution, high-quality quasi-two-dimensional (quasi-2D) perovskite film without a “coffee ring” was obtained via the introduction of a phenylbutylammonium cation into the perovskite and the use of a vacuum-assisted quick-drying process. Relatively efficient emissions of red, green, and blue (RGB) uniform quasi-2D perovskite films with high photoluminescence quantum yields were cast by the inkjet printing technique. The RGB monochrome perovskite matrix devices with 120 pixel-per-inch resolution exhibited electroluminescence, with maximum external quantum efficiencies of 3.5, 3.4, and 1.0% (for red, green, and blue light emissions, respectively). Furthermore, a full-color perovskite matrix device with a color gamut of 102% (NTSC 1931) was realized. To the best of our knowledge, this is the first report of a full-color perovskite matrix device formed by inkjet printing.
研究领域:
材料科学
·
光电技术
✓ 已验证
DOI
高影响因子
GIANT
·
2024
·
IF 5.4
Jinghua Zhao,Ming Zhang,Yongxing Guo,Wei Liu,Yi Li,Yonggang Yang
Colorful cholesteric liquid crystal polymer network (CLCN) patterns can be applied for decoration and anti-counterfeiting. Herein, the CLC inks were prepared using an acrylate liquid crystal, chiral dopants and a photoinitiator. Full-color CLCN patterns were able to be printed out using only two CLC inks by changing their volume ratio. A structure with a gradient helical pitch was identified between different colors. For anti-counterfeiting, the color patterns composed of opposite-handed CLCNs were also printed. A helical-nonhelical-helical structure was identified at the interface. In addition, CLCN patterns with a grating structure were also prepared. The results shown here not only give us a better understanding the cholesteric structure, but also lay the foundations for the applications of CLCN patterns in the fields of decoration and anti-counterfeiting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jianfeng Li,Xingyuan Ma
Lignin is an excellent choice for energy transition and high-value utilization due to its low cost, non-toxicity, renewability, and widespread availability. However, its complex structure has hindered its development. Waterborne polyurethane (WPU) uses water as a dispersion medium, making it safer for humans and the environment, but it also has some drawbacks. In this study, we prepared multicolored photoluminescent carbon quantum dots (CQDs) with a range of wavelengths, using lignin. We successfully created panchromatic CQDs by additive mixing. Red-shifting of the emission wavelengths was attributed to the synergistic effects of the sp 2 conjugate size and the carbonyl group, amide. Solid-state luminescence based on full-color CQDs was successfully achieved, and most importantly, the application of full-color CQDs in light-emitting diodes (LEDs) was realized; On the other hand, the embedding of multicolor CQDs in WPU not only makes WPU luminescent, but also improves the water-resistance and mechanical properties of WPUs dramatically based on hydrogen-bonding interactions between the functional groups on the surface of the CQDs and the urethane. We investigated the UV and strong blue light shielding ability of WPU/Y-CQDs films, which significantly improved due to the unique absorption peaks of Y-CQDs in the UV region and the strong blue light region. This work provides a reference for the high-value utilization of biomass materials and shows the direction for the multifunctional application of WPU.
研究领域:
材料科学
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化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2024
·
IF 13
Luyao Zhan,Wanxuan Xu,Zixi Hu,Jiayin Fan,Luping Sun,Xingchi Wang,Yingying Zhang,Xiaodi Shi,Bin Ding,Jianyong Yu,Ying Ma
Responsive thermochromic fiber materials capable of miniaturization and integrating comfortably and compliantly onto the soft and dynamically deforming human body are promising materials for visualized personal health monitoring. However, their development is hindered by monotonous colors, low-contrast color changes, and poor reversibility. Herein, full-color “off–on” thermochromic fluorescent fibers are prepared based on self-crystallinity phase change and Förster resonance energy transfer for long-term and passive body-temperature monitoring, especially for various personalized customization purposes. The off–on switching luminescence characteristic is derived from the reversible conversion of the dispersion state and fluorescent emission by fluorophores and quencher molecules, which are embedded in the matrix of a phase-change material, during the crystallizing/melting processes. The achievement of full-color fluorescence is attributed to the large modulation range of fluorescence colors according to primary color additive theory. These thermochromic fluorescent fibers exhibit good mechanical properties, fluorescent emission contrast, and reversibility, showing their great potential in flexible smart display devices. Moreover, the response temperature of the thermochromic fibers is controllable by adjusting the phase-change material, enabling body-temperature-triggered luminescence; this property highlights their potential for human body-temperature monitoring and personalized customization. This work presents a new strategy for designing and exploring flexible sensors with higher comprehensive performances.
研究领域:
材料科学
·
生物医学工程
·
柔性电子
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Jingwen Zhao,Yanyan Zheng,Youyou Pang,Jie Chen,Zheye Zhang,Fengna Xi,Peng Chen
Developing anti-counterfeiting technique with rich information encrypted by cheap, eco-friendly and stable photoluminescent materials is useful yet challenging. Herein, we present the application of graphene quantum dots (GQDs) for full-color and stimuli-responsive information encryption. GQDs with red, green and blue (RGB) fluorescence or ion-responsiveness are prepared based on scalable bottom-up molecular fusion in one-step hydrothermal or solvothermal reaction. Printable fluorescent ink is easily prepared by dispersing GQDs homogeneously in glycerol-containing ethanol. Utilizing the color, pattern, characteristic fluorescence emission spectrum, or stimuli-responsive emission of GQDs, information encryption under daylight and information decryption under UV light are realized. Moreover, N and S co-doped GQDs (N, S-GQDs), which have Cu 2+ -quenchable and cysteine (Cys)-recoverable blue fluorescence, are mixed with lanthanide complex (Eu 3+ DP) to realize order-sensitive stimulus-responsive information encryption.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Jialing Tan,Jiayin Liu,Juanjuan Sun,Yunjie Yin,Chaoxia Wang
Thermally responsive photonic crystals (TRPCs) are intelligent responsive materials that can dynamically coordinate electromagnetic wave transmission, translating thermal stimuli into optical signals and structural color changes. However, it remains a big challenge to develop a robust TRPC, because of the thermochromic mechanism of unstable dramatic volume change that collapses photonic crystal (PC) structure. We demonstrate a highly robust and flexible TRPC film inspired by the chameleon, combining thermochromic dyes (TDs) with PC for a synergistic response. There is only negligible color fluctuation even after 2000 color-change cycles, attributing to no lattice parameter change during the thermal stimulus. Moreover, both positive (transparency to opaque color) and negative (opaque color to transparency) TDs are introduced into TRPC, implementing a full-color RGB thermally-responsive system. The response of the positive-TRPC and negative-TRPC temperatures were 32.0 and 50.5 °C, respectively. A TRPC film with environmental adaptability was designed, which offers a promising route to anti-counterfeiting, steganography and smart window.
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
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 41
·14548-14558
·
IF 7.059
Zhihao Wang,Qinghong Meng,Chunyun Wang,Dianyuan Fan,Yu Wang
Phosphor-converted white light-emitting diodes (pc-WLEDs) integrated with deep UV chips and single-component white light-emitting phosphors have attracted widespread research interest recently. (Y,Tb,Eu)NbO4 nanophosphors with full-color emission properties were achieved in this work by a facile calcination-assisted hydrothermal method, and the elaborately designed white light-emitting (Y0.988Tb0.010Eu0.002)NbO4 phosphor was successfully applied to a 275 nm chip excited pc-WLED with a relatively low correlated color temperature (CCT) of 5517 K and a high color-rendering index (CRI) of 86.7. Through a comprehensive characterization by XRD, elemental analysis, FE-SEM, TEM, TG, FT-IR, UV-vis, and optical spectroscopy, the YNbO4 nanophosphor with optimal PL properties was evidenced to be obtainable through calcining the hydrothermally crystallized precursor at 1000 °C. The quenching concentrations of Tb3+ and Eu3+ in YNbO4 were determined to be ∼4 and 5 at%, respectively, and the efficiency of the NbO43− → Tb3+ energy transfer was calculated to be ∼47.93%. Upon excitation at 260 nm, the ternary (Y,Tb,Eu)NbO4 phosphor simultaneously displays blue NbO43−, green Tb3+, and red Eu3+ emissions. Benefiting from the NbO43− → Tb3+ → Eu3+ energy transfer, full color emission was achieved via adjusting the Tb3+ and Eu3+ concentrations in (Y,Tb,Eu)NbO4. The white light-emitting (Y0.988Tb0.010Eu0.002)NbO4 phosphor with color coordinates of (0.336, 0.334) can maintain its emission color and ∼67% of its overall emission intensity at 150 °C, indicating that the phosphor is highly promising for application in deep UV chip-based pc-WLEDs.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xuanying Chen,Jiacheng Chen,Guangchen Sun,Lifang Guo,Jianhua Su,Zhiyun Zhang
Herein, a molecular pixel system for full-color luminescence reproduction is achieved by adjusting the colorless mixtures of two matching fluorophores, i.e., polarity-insensitive 9,14-diphenyl-9,14-dihydrodibenzo[a,c]phenazine (DPAC) as the fixed red primary color and polarity-sensitive dansylamide (DSA) as dynamic blue to green primary colors. DPAC and DSA possess independent emission properties free from electron and energy transfer crosstalk between them because of their close frontier molecular orbitals as well as similar absorptions below 400 nm. According to the additive color theory, under diverse mixing ratios and various polarities, a smooth emission color change is realized in the triangle surrounded by the luminophores in the chromaticity diagram with accurate prediction and expedient reproduction. The principle of this system may open an innovative route for the development of powerful full-color luminescent materials, for example, ratiometric fluorescent polarity sensors and invisible fluorescent crayons.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）