Materials Today Chemistry
·
2022
·
IF 7.613
S. Wu,Y. Fu,Q. Liu,P. Xiong,D. Wang,G. Zhang,S. Yuan,Y. Chen
Developing highly efficient cyan-emitting fluorescent materials is essential to bridge the cyan gap in phosphor-converted white light-emitting diodes for full-spectrum white illumination. Here, a Bi-doped cyan phosphor has been reported to solve this gap. The phase purity, photoluminescence emission/excitation spectra, concentration quenching, lifetime decay curves, and temperature-dependent photoluminescence emission spectra were systematically investigated. SrLaGaO 4 :Bi 3+ exhibits a broad excitation band (250–400 nm), which matches with the emission of a commercial near-ultraviolet light-emitting diode chip. The cyan light peaked at 475 nm is observed, which is attributed to the 3 P 1 → 1 S 0 transition of Bi 3+ . The thermal quenching experiment was performed, and the activation energy was calculated as 0.36 eV. Finally, full-spectrum white light-emitting diode devices were fabricated using SrLaGaO 4 :Bi 3+ phosphors, commercial blue BaMgAl 10 O 17 :Eu 2+ phosphor, green (Ba, Sr) 2 SiO 4 :Eu 2+ phosphor, and red CaAlSiN 3 :Eu 2+ phosphor, which displayed an International Commission on an illumination coordinate of (0.3732, 0.3850), a correlated color temperature of 4290 K, and a color rendering index of 93.2 at a drive current of 20 mA. This result indicates that SrLaGaO 4 :Bi 3+ plays an essential role in bridging the cyan gap, providing new inspiration for applying cyan-emitting phosphors in full-spectrum white lighting.
研究领域:
材料科学
·
光学工程
·
固态照明
·
发光材料
·
无机化学
✓ 已验证
DOI
高影响因子
Solar RRL
·
2017
·Vol. 1
·期 10
·1700084
·
IF 0
Yuehui Lu,Zhicheng Chen,Ling Ai,Xianpeng Zhang,Jing Zhang,Jia Li,Weiyan Wang,Ruiqin Tan,Ning Dai,Weijie Song
Photovoltaic (PV) modules are not only an opto-electrical system, but also opto-thermal one, where the optical, electrical, and thermodynamic domains are strongly coupled. The means to suppress both light and heat losses in PV modules remains undeveloped. Herein, a universal route to realize both radiative cooling and light management via the ultra-broadband versatile textures is proposed, originating from the interaction with the visible, near-infrared, and mid-infrared electromagnetic waves (EMWs) via geometric, diffractive, and subwavelength optical effects. The sol–gel imprinted ultra-broadband textures exhibited a near-unity infrared emissivity over 0.96 at the atmospheric window between 8 to 13 μm for radiative cooling, and a solar transmittance and haze above 0.94 and 0.95 at the wavelengths from 350 to 750 nm, respectively, for light management. Applying the ultra-broadband textures imprinted glass to silicon PV modules as an encapsulant cover, the short-circuit current and conversion efficiency were increased by 5.12 and 3.13% in relative terms, respectively. The fabrication of such ultra-broadband versatile textures was photolithography-free, scalable, and PV industry compatible, which provided a cost-effective, long-term durable, and energy-efficient means to both light and thermal management through ultra-broadband matter-EMW interaction not only in PV modules, but also various opto-electro-thermal devices.
研究领域:
光学工程
·
材料科学
·
能源科学
·
光伏技术
·
热力学
·
纳米制造
·
电磁波与物质相互作用
✓ 已验证
DOI
Advanced Optical Materials
·
2022
·Vol. 10
·期 13
·2200276
·
IF 10.05
Chenwei Liu,Yongjie Liu,Shuxin Wang,Jiwei Liang,Cheng Wang,Fang Yao,Weijun Ke,Qianqian Lin,Ti Wang,Chen Tao,Guojia Fang
Quasi-two-dimensional (quasi-2D) perovskite light-emitting diodes (PeLEDs) are considered as one of the most potential candidates in electroluminescence territory owing to their unique quantum confinement effect and excellent thermal stability of the light. Nevertheless, heterogeneous energy domain distribution leads to severe non-radiative recombination in the process of energy transfer, which enormously hinders the performance and application of PeLEDs. Herein, an ambipolar amino acid, 5-aminovaleric acid (5AVA), is demonstrated to be able to coordinate lead and halides simultaneously with its carboxyl and amidogen groups. The coordinated ambipolar molecule not only reconstitutes energy domains of perovskites but also minimizes the interfacial defects of PeLEDs. Accordingly, the presence of 5AVA in perovskite precursors leads to dramatic suppression of the n = 1 and n = 2 phases and accelerates energy transfer from wide bandgap domains to narrow bandgap ones. As a result, maximum external quantum efficiency (EQE) of 19.3% (18.20% ± 1.10%) is achieved in quasi-2D green PeLEDs with current efficiency of 61.7 cd A −1 .
研究领域:
材料科学
·
光电子学
·
纳米科技
·
半导体器件
·
凝聚态物理
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zhiqiang Yu,Junyi Shang,Qing Shi,Yuanqing Xia,Di-Hua Zhai,Huaping Wang,Qiang Huang,Toshio Fukuda
Soft-bodied aquatic invertebrates can overcome hydrodynamic resistance and display diverse locomotion modes in response to environmental cues. Exploring the dynamics of locomotion from bioinspired aquatic actuators will broaden the perspective of underwater manipulation of artificial systems in fluidic environments. Here, we report a multilayer soft actuator design based on a light-driven hydrogel and a laser-induced graphene (LIG) actuator, minimizing the effect of the time delay by a monolithic hydrogel-based system while maintaining shape-morphing functionality. Moreover, different time scales in the response of actuator materials enable a real-time desynchronization of energy inputs, holding great potential for applications requiring desynchronized stimulation. This hybrid design principle is ultimately demonstrated with a high-performance aquatic soft actuator possessing an underwater walking speed of 0.81 body length per minute at a relatively low power consumption of 3 W. When integrated with an optical sensor, the soft actuator can sense the variation in light intensity and achieve mediated reciprocal motion. Our proposed locomotion mechanism could inspire other multilayer soft actuators to achieve underwater functionalities at the same spatiotemporal scale. The underwater actuation platform could be used to study locomotion kinematics and control mechanisms that mimic the motion of soft-bodied aquatic organisms.
研究领域:
软体机器人
·
仿生工程
·
水下驱动
·
智能材料
·
光电系统
✓ 已验证
DOI
高影响因子
MACROMOLECULES
·
2018
·
IF 5.914
Zhujun Huang,Teng Qiu,Huangbing Xu,Haotian Shi,Jianling Rui,Xiaoyu Li,Longhai Guo
Surfactant-free visible-light-controlled emulsion polymerizations are demonstrated here to synthesize ABA-type amphiphilic triblock copolymers, where A represents the hydrophilic block of poly(acrylic acid) (PAA) and B represents the hydrophobic block, such as poly(butyl acrylate) (PBA), poly(ethyl acrylate) (PEA), poly(trifluoroethyl acrylate) (PTFEA), and poly(hexafluorobutyl acrylate) (PHFBA). The photoiniferter solution polymerization of acrylic acid (AA) in 1,4-dioxane was first performed under air atmosphere and successfully controlled by visible light with the existence of iniferter agent and ascorbic acid. Using the as-synthesized PAA with trithioester end-groups as macro-iniferter agent, ABA-type triblock copolymers were synthesized in an aqueous emulsion system. Chain growth of various hydrophobic B blocks induced self-assembly and micellization. The micelles were in turn swelled by monomers and acted as main reaction loci for the further photoiniferter emulsion polymerizations. All the polymerizations showed typical characteristics of controlled/living radical polymerization (CLRP) and an obvious “on and off” feature controlled by visible light. Compared with solution polymerizations, emulsion polymerizations exhibited higher polymerization rate and monomer conversion, and an ability to directly produce colloidal polymer microparticles.
研究领域:
高分子化学
·
材料科学
·
光响应材料
·
胶体与界面科学
·
可控自由基聚合
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xinmu Zhang,Pan Xue,Xiao Yang,Cristian Valenzuela,Yuanhao Chen,Pengfei Lv,Zhaokai Wang,Ling Wang,Xinhua Xu
Shape-programmable hydrogel-based soft actuators that can adaptively respond to external stimuli are of paramount significance for the development of bioinspired aquatic smart soft robots. Herein, we report the design and synthesis of near-infrared (NIR) light-driven hydrogel actuators through in situ photopolymerization of poly(N-isopropylacrylamide) (PNIPAM) hydrogels loaded with metal–organic frameworks (MOFs) onto the surface of the poly(dimethylsiloxane) (PDMS) thin film. The MOFs can not only function as an excellent photothermal nanotransducer but also accelerate the adsorption/desorption of water due to their porous nanostructure, which speeds up the response rate of the actuators. Shape-programmable hydrogel actuators are fabricated by tailoring the patterning of PDMS thin film, and thus different shape-morphing modes such as directional bending and chiral twisting are observed under the NIR light irradiations. As the proof-of-concept demonstrations, an artificial hand, biomimetic mimosa, and flower are conceptualized with light-driven MOF-containing hydrogel actuators. Interestingly, we are able to achieve an octopus-inspired light-driven soft swimmer upon cyclic NIR illumination due to the fast photoresponsiveness of as-prepared hydrogel actuators. This work can offer insights for fabricating programmable and reconfigurable smart aquatic soft actuators, thus shining a light into their potential applications in emerging fields including soft robots, biomedical devices, and beyond.
研究领域:
软体机器人
·
智能材料
·
刺激响应型水凝胶
·
光热转换
·
仿生器件
·
功能高分子
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Shuling Zhou,Yupu Ma,Xinfeng Zhang,Wei Lan,Xingjian Yu,Bin Xie,Kai Wang,Xiaobing Luo
In quantum-dots-converted white-light-emitting diodes (QDs-WLEDs), red-emitting quantum dots are usually mixed with yellow-emitting phosphors in luminescent polymer layer to achieve a high color rendering index. However, the thermal stability of QDs is severely challenged by the high working temperature of the luminescent polymer layer with a low thermal conductivity. In this work, we enhanced the vertical thermal conductivity of the luminescent layer by filling vertically arranging hexagon boron nitride sheets (hBNS) inside using an ice template method. This created a relatively high thermal conductivity heat dissipation channel for luminescent particles. Sodium carboxymethylcellulose templates were created to support the vertically arranging hBNS. Using the proposed method, we fabricated a new package design of vertical-enhanced QDs-WLEDs (Ver-WLEDs) and compared its thermal performance with that of isotropic-enhanced QDs-WLEDs (Iso-WLEDs) and common QDs-WLEDs (Com-WLEDs). At the same working current, the maximal working temperature of Ver-WLEDs (116 °C) was 36 and 21 °C lower than that of Iso-WLEDs (152 °C) and Com-WLEDs (137 °C), respectively. Our novel method to enhance the vertical thermal conductivity of luminescent polymer layer could shed light on the application of QDs in high-power light-emitting diodes.
研究领域:
材料科学
·
光电子学
·
热管理
·
纳米技术
·
固态照明
✓ 已验证
DOI
RSC Advances
·
2014
·Vol. 5
·期 1
·608-611
·
IF 3.708
Fei Fei,Jinyong Zhuang,Weichen Wu,Minshun Song,Dongyu Zhang,Sen Li,Wenming Su,Zheng Cui
A printed aluminum cathode with low sintering temperature has been achieved using an aluminum precursor ink, AlH3·O(C3H7)2, which in the presence of a TiCl4 catalyst can be printed to give the required pattern and then sintered at 80 °C for 30 s to form an Al film. The Al cathode of 50 nm thickness has a sheet resistance of 2.09 Ω □−1 and work function of 3.67 eV. The study demonstrates that the low sintering temperature and work function of the printed film, together with its high conductivity and stability, mean that it is well suited for use as an OLED cathode and that it paves the way for fully printed flexible devices.
研究领域:
材料科学
·
有机电子学
·
印刷电子学
·
光电子学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 20
·15469-15478
·
IF 3.84
Tingting Wang,Hui Meng,Xiang Yu,Yizhu Liu,Hongbin Chen,Yi Zhu,Jinpeng Tang,Yexiang Tong,Yuanming Zhang
A BiOI/SnS2 p–n junction is prepared by depositing BiOI particles on flowerlike SnS2 flakes. The heterojunction formed between p-type BiOI and n-type SnS2 brings greatly improved photocatalytic activity compared with pure SnS2 or BiOI in the degradation of Rhodamine B dye under visible light and sunlight irradiation. The improved photocatalytic performance is explained by the synergetic effects of the formation of a p–n junction between BiOI and SnS2. The migration of photogenerated carriers can be promoted by the electric field established at the heterojunction interfaces, leading to effective separation of the photogenerated electron–hole pairs and reduced electron–hole recombination. The BiOI/SnS2 heterojunction will find promising applications in photocatalysis and solar energy conversion.
研究领域:
材料科学
·
光催化
·
纳米材料
·
能量转换
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 2
·950-955
·
IF 1.093
Yan Shancheng,Shen Yu,Wang Ka,Song Haizeng,Wang Jun
Semiconducting metal sulfides have raised strong research interest among researchers as a promising candidate for light-assisted electrochemical water splitting, because they have wide band gap. In order to harvest more light wavelengths for improvement of light-assisted electrochemical
water splitting capacity, we fabricated SnS2/SnS heterojunction nanosheets via facile and environmental route. The SnS2/SnS heterojunction nanosheets were used as photo-electrocatalytic material which exhibited low over potential of −0.64 V at the current density
of 10 mA·cm−2 in 0.5 M NaSO4 solution. Moreover, the SnS and SnS2 nanosheets displayed high over potential values of −0.80 and −0.88 V at the current density of 10 mA·cm−2, respectively. This research finding
may therefore show the potential for use of SnS2/SnS heterojunction nanosheets as low cost and environmentally friendly photo-electrocatalysis.
研究领域:
材料科学
·
能量转换
·
电化学
·
纳米技术
·
光催化
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Piaoyang Shen,Xuanyu Zhang,Ruifa Wu,Ting Zhang,Lei Qian,Wei Xu,Kai Kang,Dewei Zhao,Chaoyu Xiang
Inverted perovskite light-emitting diodes (PeLEDs) based on quantum dots (QDs) are some of the most promising candidates for next-generation lighting and display applications. Due to the strong fluorescence quenching caused by zinc oxide, high performance in such inverted devices remains challenging. Here, we report an efficient inverted green CsPbBr3 QDs LED using an emitting buffer layer. Ultrathin CsPbBr3 QD emitters act as the buffer layer to reduce the interface luminescence quenching reaction at the ZnO/upper emitting layer interface, increasing the probability of exciton recombination within the emissive layer and regulating the charge transport, leading to effective carrier recombination. The resulting device exhibits an external quantum efficiency of 13.1%, enhanced by about 4.7 times compared with that without a buffer layer device. This work provides a path to fabricating high-performance inverted PeLEDs.
研究领域:
光电子学
·
钙钛矿发光二极管
·
纳米材料
·
量子点
·
器件物理
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Jingtian Kang,Cunping Bai,Suixin Liu,Yinggang Jia
Carbon nanotubes (CNT) can enhance the mechanical and light absorption properties of the liquid crystal elastomer (LCE). Different from other ring-shaped LCE works, we proposed a ring-shaped structure using LCE-CNT composite materials that can achieve nontethered rolling with the assistance of its own gravity controlled by light. We demonstrate that the LCE-CNT composite material can lift nearly 200 times its own weight induced by light, and a cantilever beam made from it exhibits remarkable deformations to overcome gravity. Subject to light radiation, the LCE-CNT ring effectively converts light energy into mechanical energy, enabling nontethered rolling on flat surfaces, titled surfaces, and over small obstacles. Moreover, using the finite element method, we analyze the rolling mechanism of the ring induced by light and investigate the effects of light angle on the inhomogeneous deformation of the ring, the shift of the gravity center, and the generated rolling moment. The results and methods in this paper can help to give a reference for the design and analysis of intelligent soft machines.
研究领域:
材料科学
·
软体机器人
·
智能材料
·
纳米复合材料
·
光力学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）