Applied Materials Today
·
2025
·
IF 6.9
Wasim Ullah Khan,Waheed Ullah Khan,Haiou Zhu
Thermal quenching and brightness are significant challenges for many phosphors, particularly those used in WLEDs, restricting their effectiveness for large-scale implementation. However, developing phosphors with both anti-thermal quenching (anti-TQ) and high brightness remains quite challenging. Here, we report on the synergistic effect (SE) of energy transfer (ET) offset enabling anti-TQ and intrinsic suppression of concentration quenching (CQ) in sensitized photoluminescent schemes. Anti-TQ (102.1%@400 K) is achieved through the synergistic effect of ET and strong structural rigidity. The chromaticity-shifting (ΔEs) level is 8.63×10 −3 , indicating that it retains PL thermal stability comparable to commercial phosphors. The sensitization effects were investigated both experimentally and through theoretical models as a function of Dy 3+ concentrations. The ET process were studied based on the force electric dipole at each ion, achieving an efficiency of 83.4% and ET rates of 165.8%. The Ca 3 ScAl 3 B 4 O 15 :0.015Tm 3+ ,0.12Dy 3+ -based WLED exhibits satisfactory parameters of R a (83.9) and low-CCT (3345 K). The results highlight how emitters play a crucial role in dissipating excitation energies, offering a new avenue for improving the efficiency of sensitized luminescent materials.
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 Materials Chemistry C
·
2019
·Vol. 8
·期 5
·1746-1754
·
IF 6.641
Le Wang,Ran Wei,Peng Zheng,Shihai You,Tian-Liang Zhou,Wei Yi,Takashi Takeda,Naoto Hirosaki,Rong-Jun Xie
As a new generation advanced display or projection technology, laser displays or projectors have attracted great attention owing to their ultra-high brightness, energy saving nature, brilliant image quality and/or large sizes. However, for laser displays or projectors without using three primary laser diodes, the lack of appropriate blue-laser-driven color converters is a big limitation and challenge. In this work, we propose to develop laminated phosphor-in-glass (PiG) films as laser-driven color converters for wide-color-gamut and high-brightness laser displays. The β-Sialon:Eu and CaAlSiN3-LiSi2N2-Si2N2O, Calson:Ce phosphors were chosen as the green and orange emitters, respectively, and were co-fired with glass frits on a sapphire substrate to form PiG films. No interfacial reactions between phosphors and glass were identified, and phosphor powders were uniformly distributed in the glass matrix. The phosphor content and the film thickness had an influence on the microstructure, luminance saturation and optical properties of the PiG films under laser light irradiation; both PiG films reached a maximum luminance saturation of 6.09 W mm−2 when their microstructures were optimized. The lamination architecture of the PiG films had a great impact on the optical properties of the laser-driven white light, and the maximum ones were achieved as the green-emitting PiG film was positioned on the orange-emitting film adhered to the sapphire substrate. Under 4.82 W mm−2 blue laser excitation, the laminated double-layer PiG films enabled the creation of white light with a wide color gamut of 107% NTSC, luminous efficacy of 74.44 lm W−1, luminous flux of 282.13 lm and color temperature of 7902 K. These results indicate that the laminated PiG films are promising color converters for use in high-power and wide-color-gamut laser displays or projectors.
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
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Jing Li,Jia-Nan Tian,Zhao-Jun Liu,Shu-Hui Zhang,Xin-Yue Zhang,Han-Min Wang,Qing-Xi Hou
The structure of wood poses significant challenges for Chemi-thermomechanical pulp (CTMP) pulping process, particularly in achieving efficient chemical penetration and uniform distribution within woodchips. While alkali pre-impregnation is known to enhance pulp bleachability, this work advances prior work by systematically correlating lignin’s structural evolution under optimized pretreatment conditions with the bleaching performance of poplar woodchips (PWCs)-derived CTMP. The results show that the content of the main linkages, e.g. , β - O -4 and β - β , in lignin were significantly reduced 29.58 % and 21.00 %, respectively, after alkali pre-impregnation, and the number of aromatic regions including guaiacyl (G), syringyl (S) and para-coumaric acid ester (PCE) units reduced, confirming the partial depolymerization of lignin. The optimum pre-impregnation conditions, including 6 % alkali charge at 70 °C for 30 min, were beneficial to achieving a satisfied pulp brightness (74.73 % ISO). This work would highlight the critical role of alkali pre-impregnation techniques in CTMP pulping and bleaching processes.
研究领域:
林业工程
·
制浆造纸科学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 23
·11211-11221
·
IF 7.233
Jiacong Xu,Yanqin Miao,Jingxia Zheng,Hua Wang,Yongzhen Yang,Xuguang Liu
First, oleophilic carbon dots (CDs) with a fluorescence quantum yield (QY) of 41% were synthesized by a one-pot microwave-assisted carbonization method. Then, CD-based electroluminescent light emitting diodes (CD-LEDs) were prepared. The impact of CD aggregation on the brightness of CD-LEDs was studied. The results show that, to some extent, with the decrease of the aggregation of the CD film, the luminescence quenching of the CD-LEDs gradually decreased, and the luminance of the CD-LEDs gradually increased. Hence, in order to improve the dispersion of CDs and reduce the aggregation of CDs and the luminescence quenching of the devices, host–guest doping was adopted to effectively improve the brightness of CD-LEDs. In this work, the yellow emission of the doped devices is mainly derived from the direct carrier trapping on CDs. Moreover, white and yellow CD-LEDs were obtained from the same oleophilic CDs by tuning the structure of the devices. The white CD-LEDs exhibit a high color rendering index (CRI) of 83 with a luminance of 455.2 cd m−2. The yellow CD-LEDs show the maximum brightness of 339.5 cd m−2 and excellent color stability. The results show that the luminescence quenching of CD-LEDs was resisted and the brightness of CD-LEDs was improved by using host–guest doping.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Remote Sensing
·
2021
·Vol. 13
·期 16
·3311
·
IF 4.848
Alejandro Sánchez de Miguel,Jonathan Bennie,Emma Rosenfeld,Simon Dzurjak,Kevin J. Gaston
The global spread of artificial light is eroding the natural night-time environment. The estimation of the pattern and rate of growth of light pollution on multi-decadal scales has nonetheless proven challenging. Here we show that the power of global satellite observable light emissions increased from 1992 to 2017 by at least 49%. We estimate the hidden impact of the transition to solid-state light-emitting diode (LED) technology, which increases emissions at visible wavelengths undetectable to existing satellite sensors, suggesting that the true increase in radiance in the visible spectrum may be as high as globally 270% and 400% on specific regions. These dynamics vary by region, but there is limited evidence that advances in lighting technology have led to decreased emissions.Keywords:ALAN;artificial light at night;astronomy;DMSP;LEDs;light pollution;melatonin;nocturnal ecology;VIIRS
研究领域:
环境科学
·
生物学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 8
·3114-3120
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IF 8.067
Shaoxin Song,Yang Liu,Xuejuan Liu,Jianping Ge,Dengteng Ge,Lili Yang
Electrically-responsive photonic crystals have drawn extensive interest due to the growing demands of camouflage, displays, sensing, energy-saving buildings, etc., due to their fine control, fast response and convenient implementation. Veiled by the development on hue modulation, brightness/saturation tuning still remains a challenge. This work demonstrates a strategy to modulate the brightness of electrically-responsive photonic pixels via surface charge treatment of electrodes. The reflection intensity is raised by 110% due to the growth of the short-range ordered Fe3O4@C colloidal lattice as a result of enhanced Coulombic forces. The numerical simulation of the potential of the photonic liquid confirms that the potential distribution depends on the electrode surface charge. Furthermore, wide angle-independent photonic colors are well-tuned due to the anisotropic expansion/compression of the photonic lattice via electrophoretic movements of charged particles under an electric field. We believe that our work not only provides a useful way to modulate brightness but also suggests novel designs for electrically-responsive photonic 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
NORDIC PULP & PAPER RESEARCH JOURNAL
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2022
·Vol. 37
·期 4
·677-685
·
IF 1.595
Huiming Fan,Jingkun Yang,Zhuoyao Ma,Hangtian Gao,Hongyan Mou,Jianan Liu
In order to solve the environmental problems caused by landfilling and incineration of Fenton sludge, realize the recycling of papermaking solid waste. In this paper, we explored the formation of a layer of calcium carbonate coating on the surface of Fenton sludge by crystallization coating in the Fenton sludge-[Ca(OH) 2 /H 2 O]-CO 2 three-phase reaction system to improve the brightness of Fenton sludge and apply it to the filling of paper. The effects of particle size, temperature, stirring rate and calcium hydroxide addition on crystallization coating effect were studied. The advantages and disadvantages of the coating effect are mainly judged by the brightness and dustiness of the powder material. The research results show that when the particle size is 38–48 μm, the temperature is 25 °C, the stirring speed is 600 r/min, and the ratio of calcium hydroxide to Fenton sludge is 2:1, the brightness of the composite can be increased from 3.56 % ISO to 64.24 % ISO.
研究领域:
环境科学
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材料科学
·
造纸工程
✓ 已验证
DOI
高影响因子
Light-Science & Applications
·
2025
·Vol. 14
·期 1
·1-10
·
IF 23.4
Li Haotao,Wang Jiming,Chen Shuming
The realization of solution-processed tandem quantum-dot LEDs (QLEDs) remains a technical challenge due to the limitations of inefficient interconnect layer and the damage caused by multiple solution processes. Here, we develop a high performance tandem QLED by face-to-face integrating a top-emitting QLED with a transparent QLED. The top and bottom units can be addressed independently, thereby enabling the tandem QLED to operate in series, parallel, and color-tunable modes for multifunctionality. In series mode, QLEDs demonstrate an ultra-low turn-on voltage of 3.3 V and a record-breaking external quantum efficiency of 60.7%. In parallel mode, QLEDs achieve an impressive brightness of over 4.8 × 10 6 cd m -2 . In color-tunable mode, the color, brightness, and color temperature can all be adjusted with a color tuning range of 114% NSTC. Moreover, both series and parallel connections contribute to an improved stability, resulting in a T 95 lifetime of nearly 30,000 h at 1000 cd m -2 , which is an improvement of approximately 2.8 times over control devices. Our work offers a feasible solution for achieving multifunctional tandem QLEDs with the advantages of solution processed, high efficiency, high brightness, long lifetime and full color tunability for various light source applications.
研究领域:
材料科学
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光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Science
·
2022
·Vol. 9
·期 22
·2201844
·
IF 17.521
Zong-Tao Li,Hong-Wei Zhang,Jia-Sheng Li,Kai Cao,Ziming Chen,Liang Xu,Xin-Rui Ding,Bin-Hai Yu,Yong Tang,Jian-Zhen Ou,Hao-Chung Kuo,Hin-Lap Yip
Tandem structures with different subpixels are promising for perovskite-based multicolor electroluminescence (EL) devices in ultra-high-resolution full-color displays; however, realizing excellent luminance- and color-independent tunability considering the low brightness and stability of blue perovskite light-emitting diodes (PeLEDs) remains a challenge. Herein, a bright and stable blue gallium nitride (GaN) LED is utilized for vertical integration with a green MAPbBr 3 PeLED, successfully achieving a Pe-GaN tandem LED with independently tunable luminance and color. The electronic and photonic co-excitation (EPCE) effect is found to suppress the radiative recombination and current injection of PeLEDs, leading to degraded luminance and current efficiency under direct current modulation. Accordingly, the pulse-width modulation is introduced to the tandem device with a negligible EPCE effect, and the average hybrid current efficiency is significantly improved by 139.5%, finally achieving a record tunable luminance (average tuning range of 16631 cd m −2 at an arbitrary color from blue to green) for perovskite-based multi-color LEDs. The reported excellent independent tunability can be the starting point for perovskite-based multicolor EL devices, enabling the combination with matured semiconductor technologies to facilitate their commercialization in advanced display applications with ultra-high resolution.
研究领域:
材料科学
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光电技术
·
显示技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Heng Liu,Xiaoqian Chen,Shuzhen Ni,Zongquan Li,Na Liu,Yingjuan Fu
An effective removal of lignin could reduce the chromogenic groups of lignin in pulp. Herein, corn stover was pulped via the formic acid to investigate the effects of cooking time and temperature on the crude pulp properties. The strong hydrogen ion action of formic acid helped inhibiting both the re-polymerization of degraded lignin molecules and the subsequent adsorption on fiber. The brightness of the crude pulp could reach 51.5 %ISO with the increased lightness and decreased yellowness. The effective lignin removal reduced the residual lignocellulosic bundles in the crude pulp with the increased cooking temperature and time. The lowest lignin content of 3.5 %, α-cellulose content of 94.0 %, and Kappa number of 9.3 were obtained. Meanwhile, the lignin and monosaccharide content in the black liquor could reach 13.3 % and 28.5 %, respectively. The number-average molecular weight of lignin was as low as 818 g/mol. These were helpful to form the hydrogen bonds between fibers, thus enhancing the tensile and burst index of paper sheets. The tensile, burst and tearing indices of the corresponding crude pulp were 47.5 N·m/g, 1.42 kPa·m 2 /g and 6.53 mN·m 2 /g, respectively. This work provided valuable practical significance for studying the performance of straw pulp by high temperature formic acid cooking.
研究领域:
制浆造纸
·
生物质化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Ziqiang Tian,Jinyao Zhu,Qilin Guo,Lulu Chen,Jia Guo,Changchun Wang
Photonic crystals (PCs) with unique light manipulation capability have attracted widespread attentions. However, weak photonic bandgaps, poor structural color saturation, and tedious preparation process restrict their further development and practical application. Herein, an ultra-bright stimuli-responsive PC film with excellent optical performance is prepared by assembly of cadmium sulfide@polyacrylic acid (CdS@PAA) core–shell nanoparticles into PCs through molecule-mediated shearing-induced assembly technique (MSAT), this fabrication process is fast and facile, the solid periodic micro/nano-structures can be formed within 10 s, and a wide selection range of structural color can be obtained. The high refractive index of CdS guarantees high brightness of the PC films. The prerequisite of using MSAT for preparation of large-sized ultra-bright PC film is that the CdS@PAA nanoparticles possess appropriate thickness of PAA shell. Compared with conventional PCs, the ultra-bright PC films present strong photonic bandgaps and high structural color saturation, the relative reflectance is up to 130% compared with a standard aluminum mirror, which is more than four times reflectivity of PS@PAA microspheres. In addition, the PC paint is prepared by mashing the ultra-bright PC film and blending it with transparent polydimethylsiloxane (PDMS) matrix, the PC coating prepared by alkali treated ultra-bright PC pigments can achieve good water response ability and anticounterfeiting effect.
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
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Kongyu Ge,Yifan Gao,Hongyu Yi,Zhan Li,Shaowei Hu,Hongjun Ji,Mingyu Li,Huanhuan Feng
Structural color, renowned for its enduring vibrancy, has been extensively developed and applied in the fields of display and anticounterfeiting. However, its limitations in brightness and saturation hinder further application in these areas. Herein, we propose a pendant evaporation self-assembly method to address these challenges simultaneously. By leveraging natural convection and Marangoni flow synchronization, the self-assembly process enhances the dynamics and duration of colloidal nanoparticles, thereby enhancing the orderliness of colloidal photonic crystals. On average, this technique boosts the brightness of structural color by 20% and its saturation by 35%. Moreover, pendant evaporation self-assembly is simple and convenient to operate, making it suitable for industrial production. We anticipate that its adoption will remarkably advance the industrialization of structural color, facilitating its engineering applications across various fields, such as display technology and anticounterfeiting identification.
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
危险品化学品经营许可证（带存储）