Small
·
2023
·Vol. 19
·期 45
·2303247
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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
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光电技术
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纳米科技
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2022
·Vol. 29
·期 11
·1954-1962
·
IF 3.85
Zhao Yue,Wang Bei,Shi Minjie,An Shibo,Zhao Liping,Yan Chao
Rechargeable aqueous magnesium-ion batteries (MIBs) show great promise for low-cost, high-safety, and high-performance energy storage applications. Although manganese dioxide (MnO 2 ) is considered as a potential electrode material for aqueous MIBs, the low electrical conductivity and unsatisfactory cycling performance greatly hinder the practical application of MnO 2 electrode. To overcome these problems, herein, a novel Mg-intercalation engineering approach for MnO 2 electrode to be used in aqueous MIBs is presented, wherein the structural regulation and electrochemical performance of the Mg-intercalation MnO 2 (denoted as MMO) electrode were thoroughly investigated by density functional theory (DFT) calculations and in-situ Raman investigation. The results demonstrate that the Mg intercalation is essential to adjusting the charge/ion state and electronic band gap of MMO electrode, as well as the highly reversible phase transition of the MMO electrode during the charging-discharging process. Because of these remarkable characteristics, the MMO electrode can be capable of delivering a significant specific capacity of ∼419.8 mAh·g −1 , while exhibiting a good cycling capability over 1000 cycles in 1 M aqueous MgCl 2 electrolyte. On the basis of such MMO electrode, we have successfully developed a soft-packaging aqueous MIB with excellent electrochemical properties, revealing its huge application potential as the efficient energy storage devices.
研究领域:
材料科学
·
电化学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2023
·Vol. 13
·期 19
·2300253
·
IF 27.8
Yage Zhou,Chunxu Xiang,Qi Dai,Sitong Xiang,Ran Li,Yuancai Gong,Qiang Zhu,Weibo Yan,Wei Huang,Hao Xin
Thin film solar cells on semitransparent substrates are attracting much attention due to new application scenarios including building-integrated photovoltaics (BIPV). Environmentally-benign element constituted and highly stable kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) thin film solar cells are ideal candidates for such applications. However, the efficiency of kesterite solar cells on semitransparent substrates is far behind that on opaque Mo-based substrates. Here, fabrication of CZTSSe solar cells on fluorine-doped tin oxide (FTO) substrates from molecular solution and how step-by-step absorber engineering improves device performance is reported. A power conversion efficiency of 7.02% is obtained when the absorber is fabricated on bare FTO, which is improved to 9.56% after adding a MoO 3 interfacial layer. Investigations show the enhancement originates from the transformation of MoO 3 to MoSe 2 during film selenization which initiates crystallization at the back contact and at the same time prevents oversize grains at the absorber surface. Na-doping and Ag alloying further facilitate grain growth and mitigate band tailing, resulting in a certified effective area efficiency of 11.43% with all device parameters comparable to that on an Mo-substrate. This is the first time highly efficient kesterite solar cells are demonstrated on transparent electrodes, which opens up new opportunities for these earth-abundant elements composed of thin film photovoltaics.
研究领域:
材料科学
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光伏技术
·
半导体物理
·
能源材料
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薄膜器件
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无机功能材料
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 37
·期 23
·2404013
·
IF 27.4
Yunxia Hu,Jun Wang,Mohsen Tamtaji,Yuan Feng,Tsz Wing Tang,Mohammadreza Amjadian,Ting Kang,Mengyang Xu,Xingyi Shi,Dongxu Zhao,Yongli Mi,Zhengtang Luo,Liang An
Van der Waals junctions hold significant potentials for various applications in multifunctional and low-power electronics and optoelectronics. The multistep device fabrication process usually introduces lattice mismatch and defects at the junction interfaces, which deteriorate device performance. Here the layer engineering synthesis of van der Waals homojunctions consisting of 2H-MoTe 2 with asymmetric thickness to eliminate heterogenous interfaces and thus obtain clean interfaces is reported. Experimental results confirm that the homostructure nature gives rise to the formation of pristine van der Waals junctions, avoiding chemical disorders and defects. The ability to tune the energy bands of 2H-MoTe 2 continuously through layer engineering enables the creation of adjustable built-in electric field at the homojunction boundaries, which leads to the achievement of self-powered photodetection based on the obtained 2H-MoTe 2 films. Furthermore, the successful integration of 2H-MoTe 2 homojunctions into an image sensor with 10 × 10 pixels, brings about zero-power consumption and near-infrared imaging functions. The pristine van der Waals homojunctions and effective integration strategies shed new insights into the development of large-scale application for two-dimensional materials in advanced electronics and optoelectronics.
研究领域:
光电子学
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纳米电子学
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二维材料
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半导体器件
·
图像传感技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）