Science Bulletin
·
2024
·
IF 18.8
Shuxin Wang,Zhiqiu Yu,Jiajun Qin,Guoyi Chen,Yongjie Liu,Shuaiwei Fan,Chao Ma,Fang Yao,Hongsen Cui,Shun Zhou,Kailian Dong,Qianqian Lin,Chen Tao,Feng Gao,Weijun Ke,Guojia Fang
Perovskite light-emitting diodes (PeLEDs) exhibit remarkable potential in the field of displays and solid-state lighting. However, blue PeLEDs, a key element for practical applications, still lag behind their green and red counterparts, due to a combination of strong nonradiative recombination losses and unoptimized device structures. In this report, we propose a buried interface modification strategy to address these challenges by focusing on the bottom-hole transport layer (HTL) of the PeLEDs. On the one hand, a multifunctional molecule, aminoacetic acid hydrochloride (AACl), is introduced to modify the HTL/perovskite interface to regulate the perovskite crystallization. Experimental investigations and theoretical calculations demonstrate that AACl can effectively reduce the nonradiative recombination losses in bulk perovskites by suppressing the growth of low- n perovskite phases and also the losses at the bottom interface by passivating interfacial defects . On the other hand, a self-assembly nanomesh structure is ingeniously developed within the HTLs. This nanomesh structure is meticulously crafted through the blending of poly-(9,9-dioctyl-fluorene-co-N-(4-butyl phenyl) diphenylamine) and poly (n-vinyl carbazole), significantly enhancing the light outcoupling efficiency in PeLEDs. As a result, our blue PeLEDs achieve remarkable external quantum efficiencies , 20.4% at 487 nm and 12.5% at 470 nm, which are among the highest reported values. Our results offer valuable insights and effective methods for achieving high-performance blue PeLEDs.
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
POLYMER
·
2020
·
IF 4.231
Yueshan Li,Yulin Zhang,Ji Lan,Bin Yan,Junying Qiu,Qingdang Meng,Yinjie Peng,Lingying Shi,Rong Ran
In this work, an ion-conducting supramolecular gel with light-controlled variable conductivity named αCD-Azo gel was prepared by introducing α-cyclodextrin (αCD), anionic 1-octanesulfonic acid and azobenzene into PAM-co-PAA gel system. Based on the host-guest interactions between α-cyclodextrin and anionic 1-octanesulfonic acid (and azobenzene), the light-controlled variable conductivity properties of αCD-Azo gel have been achieved. In the absence of UV light, the conductivity of the αCD-Azo gel is around 45 mS/m. When the αCD-Azo gel was irradiated with 365 nm UV light, the conductivity of the αCD-Azo gel is about 55 mS/m. Upon 420 nm Vis light irradiation , the conductivity of the gel is about 62 mS/m. Moreover, a light-controlled logic circuit constructed with the αCD-Azo gel can control small light bulbs by UV light signals. This work provides an achievable platform for achieving the photo-controlled variable resistance effect of the gel, and can also be used to achieve non-composite photo-responsive properties of polymer materials.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2025
·
IF 10.5
Jun Yang,Yongwei Zhang,Guangjuan Luo,Suiping Zheng,Shuangyan Han,Shuli Liang,Ying Lin
Bioluminescence-based light-off and light-on biosensors are widely used in environmental monitoring due to their rapid, cost-effective, real-time, and easy operation. However, stability and sensitivity issues in detecting real samples remain challenging. This study introduces a novel approach utilizing combined light-off and light-on biosensors for rapid and sensitive contaminants detection within 45 min in real samples. First, a recombinase-based state machine (RSM) was used to construct light-off RSM biosensors (light-off RSMs) for continuously strong light emission and overexpressing of outer membrane porins OmpC and OmpF enhanced their sensitivity to toxic contaminants. Additionally, a new experimental protocol containing the cell culture, collection, preparation, and the contaminant measurement was established for bioluminescent light-on whole-cell biosensors (light-on WCBs) in contaminant detection, initially developed using cadmium (Cd) and later applied to lead (Pb) and mercury (Hg). For Cd light-on WCBs, overexpressing OmpC and knocking out the contaminant exporter ZntA enhanced the accumulation of intracellular Cd in WCB cells, resulting in increased sensitivity to low concentrations of contaminants. Further, metabolic modifications in light-on WCBs significantly boosted luminescence. These genetic modified bacterial strains, whether freshly harvested or as freeze-dried powders, showed rapid luminescent responses to contaminants in the picomolar (pM) to nanomolar (nM) range within 45 min. Finally, the combined use of light-off RSMs and light-on WCBs successfully assessed toxicity and detected specific contaminants in real environmental and food samples. These strategies could be applied to developing other bacterial luciferase-based biosensors and even other types such as colorimetric biosensors.
研究领域:
环境科学
·
分子生物学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Chenyini Xu,Meng Chen,Shu Xu,Chong Geng
Optical scatterer additives play a critical role in enhancing the light conversion efficiency and uniformity of quantum dot-converted light-emitting diodes (Qc-LEDs). This study investigates the impact of optical characteristics and morphology of nanoscatterer on the light conversion and extraction efficiency of Qc-LEDs. Various metal oxides and boron nitride nanoparticles and nanoplates with different diffraction index were selected to carry out the study. Finite-Difference Time-Domain (FDTD) simulation was employed to evaluate the scattering effect of various nanosphere and nanoplate scatterers on the optical performance of the Qc-LEDs. The simulation results revealed that the hybrid nanoscatterer integrates the forward-scattering from the nanosphere and backward-scattering of blue light from the nanoplate. Spectral analysis was conducted to examine the optical performance of Qc-LEDs with varying combinations and concentrations of nanoscatterers. TiO 2 nanoparticles and Al 2 O 3 nanoplates were found to be the best combination for maximal light conversion and extraction efficiency within Qc-LEDs. The results indicate an optimal light efficiency is obtained with the optimal ratio of 1:2:2 for quantum dots, TiO 2 nanoparticles, and Al 2 O 3 nanoplates. These findings reveal the relationship between optical properties, morphology, and light conversion efficiency in Qc-LEDs, highlighting the advantages of the hybrid nanoscatterers for improving optical performance of Qc-LEDs.
研究领域:
光学
·
材料科学
·
纳米技术
·
光子学
·
半导体器件
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2025
·
IF 2.6
Na Lin,Zhao-Yang Hu,Xin-Yue Zhang,Yu Zhang,Kai-Qi Sun,Xiao-Wu Lei,Zhihong Jing,Zhi-Wei Chen
Recently, low-dimensional organic-inorganic metal halide perovskites acting as white light emitting materials have been widely studied in the field of optoelectronics and solid-state lighting due to their facile preparation and excellent optical characteristics. However, the luminescence efficiency and light stability of white Light-emitting diodes (WLEDs) were hindered by the re-absorption of mixing phosphors due to the difference of light decay. Herein, we reported a new zero-dimensional (0D) cadmium halide of (BAPPz)Cd2Br8·2H2O with [CdX4]2- as optically active center which emits broadband yellow light for the first time and whose PLQY is 13.78%. Significantly, (BAPPz)Cd2Br8·2H2O can be used as a new phosphor for white light-emitting diode doped with a trace of blue commercial phosphor, which achieves a high color rendering index (CRI) of 93.7 and has the correlated color temperature (CCT) close to the domestic standard light source D65 (6500 K). With the driving current of the WLEDs device is increasing from 20 mA to 120 mA, the CRI values consistently maintain a high standard (> 90). This work not only demonstrates a new orientation to fabricate light-emitting diodes with high CRI values but also highlights its potential application in the development of energy-efficient white light-emitting diodes.
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 PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2017
·Vol. 123
·期 3
·1-9
·
IF 1.455
Guan Yingli,Song Lixin,Zhou Yangyang,Yin Xin,Xie Xueyao,Xiong Jie
Two kinds of TiO 2 microspheres (TMS) with average diameter of 1500 nm but different surface were fabricated by solvothermal method from different Ti source. The effect of TMS on the light harvesting and photovoltaic performance of dye-sensitized solar cells (DSSCs)was investigated. The UV–Vis diffusion reflectance spectra and absorption spectra of N719 dye in detached solutions proved that the TMS showed dual functions of light scattering and dye-adsorption which was an important functional material in DSSCs. The results showed that the TMS made from titanium(IV) isopropoxide with rough surface (TMSR) exhibited better photovoltaic performance than that of TMS made from tetrabutyl titanate with smooth surface (TMSS). To further improve the photovoltaic performance, the double-layered DSSCs made of P25 as an underlayer and TMS as a light-scattering layer (P25-TMS) were fabricated. The photovoltaic performance of double-layered DSSCs was higher than that of the single-layered DSSCs with similar thickness. Especially, the DSSCs made of P25 as an underlayer and the TMSR as a light-scattering layer (P25-TMSR) had a highest power conversion efficiency of 7.62%. This was higher than that of single-layered TMSR-based cell (5.54%), P25-based cell (5.75%), and double-layered P25-TMSS-based cell (6.78%) with similar thickness. This was mainly attributed to the large specific surface area, superior light scattering ability, and fast electron transport of TMSR.
研究领域:
材料科学
·
能源科学
·
纳米技术
·
光电子学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaochen Fang,Biao Zheng,Mengyu Ding,Yingzhi Ye,Wei Xu,Meishan Han,Jiajia Lu,Bingwen Zhang,Jinquan Hong,Hai Huang,Xiaolong Liu,Jun Wang,Zhanhui Yuan
All-inorganic perovskite nanocrystals (NCs) exhibit great promise in optoelectronics and photovoltaics. However, their intrinsic low-thermal/oxygen/moisture stability and the rigorous synthesis procedures have limited the practical applications. Here, we present a facile, one-step, light-induced method to synthesize CsPbCl 3 :Mn 2+ NCs at room temperature by using carbon tetrachloride (CCl 4 ) as the halide source. The corresponding formation mechanism of CsPbCl 3 :Mn 2+ NCs is revealed, where CsPbCl 3 :Mn 2+ NCs are formed through the direct incorporation of [MnCl 6 ] 4− octahedral into the perovskite lattice during the nucleation and growth process. Additionally, we demonstrate the in-situ growth of CsPbCl 3 :Mn 2+ NCs within mesoporous silica (mSiO 2 ) spheres to form CsPbCl 3 :Mn 2+ @mSiO 2 nanocomposites via the light-induced method, resulting in a remarkable improvement in high-temperature and long-time stability. As a prototype experiment, a white light-emitting diode (WLED) device is constructed using CsPbCl 3 :Mn 2+ @mSiO 2 nanocomposites, which exhibits a bright white-light emission with the CIE chromaticity coordinate of (0.352, 0.340). It is anticipated that light-induced synthesis method provides a straightforward strategy for synthesizing multifunctional halide perovskite nanocrystals and nanocomposites for versatile applications.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nano Materials Science
·
2022
·
IF 0
Baiqian Wang,Yuru Tang,Xin Yang,Wensi Cai,Ru Li,Wen Ma,Shuangyi Zhao,Chen Chen,Zhigang Zang
Yellow light-emitting diodes (LEDs) as soft light have attracted abundant attention in lithography room, museum and art gallery. However, the development of efficient yellow LEDs lags behind green and blue LEDs, and the available perovskites yellow LEDs suffer from the instability. Herein, a pressure-assisted cooling method is proposed to grow lead-free CsCu 2 I 3 single crystals, which possess uniform surface morphology and enhanced photoluminescence quantum yield (PLQY) stability, with only 10% PLQY losses after being stored in air after 5000 h. Then, the single crystals used for yellow LEDs without encapsulation exhibit a decent Correlated Color Temperature (CCT) of 4290 K, a Commission Internationale de l'Eclairage (CIE) coordinate of (0.38, 0.41), and an excellent 570-h operating stability under heating temperature of 100 °C. Finally, the yellow LEDs facilitate the application in wireless visible light communication (VLC), which show a −3 dB bandwidth of 21.5 MHz and a high achievable data rate of 219.2 Mbps by using orthogonal frequency division multiplexing (OFDM) modulation with adaptive bit loading. The present work not only promotes the development of lead-free single crystals, but also inspires the potential of CsCu 2 I 3 in the field of yellow illumination and wireless VLC.
✓ 已验证
产品关联
DOI
Advanced Optical Materials
·
2023
·
IF 9
Haoyue Zhang,Yuru Tang,Chen Chen,Meiqin Xiao,Jonghee Yang,Wei Zhang,Chaochao Qin,Ting Xiang,Long Xu,Ping Chen
Metal halide perovskites are promising light source materials for visible light communication (VLC) due to their excellent photoelectric properties and small resistance-capacitance time constant. However, previous reports mainly used perovskites as the passive light sources, which not only makes it susceptible to posterior excitation light sources, but also complex in the integration process. Herein, the quasi-2D PEA 2 Cs n-1 Pb n Br 3n+1 perovskite light–emitting diodes (PeLEDs) as an active light source in VLC link is demonstrated. It is found that the charging/discharging process of PeLEDs is an important factor governing the -3 dB bandwidth (f -3 dB ) of the VLC. To improve this, 3-sulfopropyl methacrylate potassium salt (SMPS) molecules are introduced into perovskite to simultaneously passivate deep and shallow energy level defects at grain boundaries. Additionally, the multiple quantum wells structures of PEA 2 Cs n-1 Pb n Br 3n+1 are modified to be flat. At the optimal SMPS concentration, the maximum external quantum efficiency of PeLEDs reaches 21.5%. Meanwhile, the VLC achieves 3.2 MHz f -3 dB with data transmission of 18.6 Mbps, which is the highest f -3 dB in PeLEDs with the same active area. Hence, it provides a versatile method to improve the performance of VLC links based on active light sources and advances toward the goal of high-speed, energy-efficient and secure free communication.
研究领域:
材料科学
·
光电子学
·
通信工程
✓ 已验证
产品关联
DOI
高影响因子
Science Advances
·
2022
·
IF 14.957
FANG WANG,MEIJIN LIU,CONG LIU,QILONG ZHAO,TING WANG,ZUANKAI WANG,XUEMIN DU
Slippery lubricant-infused porous (SLIPS) and superhydrophobic surfaces have emerged as promising interfacial materials for various applications such as self-cleaning, anti-icing, and antifouling. Paradoxically, the coverage/screening of lubricant layer on underlying rough matrix endows functionalities impossible on superhydrophobic surfaces; however, the inherent flexibility in programming droplet manipulation through tailoring structure or surface charge gradient in underlying matrix is compromised. Here, we develop a class of slippery material that harnesses the dual advantages of both solid and lubricant. This is achieved by rationally constructing a photothermal-responsive composite matrix with real-time light-induced surface charge regeneration capability, enabling photocontrol of droplets in various working scenarios. We demonstrate that this light-induced charged slippery surface (LICS) exerts photocontrol of droplets with fast speed, long distance, antigravity motion, and directionally collective motion. We further extend the LICS to biomedical domains, ranging from specific morphological hydrogel bead formation in an open environment to biological diagnosis and analysis in closed-channel microfluidics.
✓ 已验证
DOI
PubMed
高影响因子
Nano Research
·
2018
·Vol. 11
·期 4
·1810-1821
·
IF 7.994
Li Mingtong,Su Yajun,Zhang Hui,Dong Bin
A micropump induces the flow of its surrounding fluids and is extremely promising in a variety of applications such as chemical sensing or mass transportation. However, it is still challenging to manipulate its pumping direction. In this study, we examine a binary micropump based on perovskite and poly[(2-methoxy-5-ethylhexyloxy)-1,4-phenylenevinylene] (MEHPPV). The micropump is operational under the influence of light. Light exhibits significant versatility in controlling the pumping phenomenon of the micropump. It governs the start and stop and also regulates the velocity and directions. The direction control signifies immense opportunities for the development of micropumps with unprecedented pumping behaviors and functions (such as heartbeat-like pumping, rectification, and amplification). This makes them potentially useful in various fields. Hence, it is expected that the micropump reported in the current study could act as a key step towards the further development of more sophisticated micropumps for diverse applications.
研究领域:
材料科学
·
光学工程
·
微流控技术
✓ 已验证
DOI
高影响因子
Light-Science & Applications
·
2024
·Vol. 13
·期 1
·1-13
·
IF 20.6
Xiong Jianyun,Li Xing,He Ziyi,Shi Yang,Pan Ting,Zhu Guoshuai,Lu Dengyun,Xin Hongbao
Micro/nanorobots hold exciting prospects for biomedical and even clinical applications due to their small size and high controllability. However, it is still a big challenge to maneuver micro/nanorobots into narrow spaces with high deformability and adaptability to perform complicated biomedical tasks. Here, we report a light-controlled soft bio-microrobots (called “Ebot”) based on Euglena gracilis that are capable of performing multiple tasks in narrow microenvironments including intestinal mucosa with high controllability, deformability and adaptability. The motion of the Ebot can be precisely navigated via light-controlled polygonal flagellum beating. Moreover, the Ebot shows highly controlled deformability with different light illumination duration, which allows it to pass through narrow and curved microchannels with high adaptability. With these features, Ebots are able to execute multiple tasks, such as targeted drug delivery, selective removal of diseased cells in intestinal mucosa, as well as photodynamic therapy. This light-controlled Ebot provides a new bio-microrobotic tool, with many new possibilities for biomedical task execution in narrow and complicated spaces where conventional tools are difficult to access due to the lack of deformability and bio-adaptability.
✓ 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）