Device
·
2025
·
IF 8
Hao Wang,Wenjia Zhou,Yunlong Liu,Haobo Wu,Si Peng,Wei Xuan Liu,Ruiqi Xu,Wei Zhou,Mingyu Ma,Gaoqi Liu,Juan Du,Yuxin Leng,Zhiqun Lin,Wei Lu,Zhijun Ning
An upconversion device uses a methodology for direct infrared imaging, but the performance is limited by the inefficient carrier transmission between infrared detecting and emitting layers. Herein, we developed an upconversion infrared imaging device by integrating infrared quantum dots and a perovskite quantum well emitter. The energy level of the perovskite quantum well aligns well with the infrared quantum dot, leading to an effective carrier transition between them, generating a photon conversion efficiency of over 10% and a high on-off ratio of 45.5. The device shows a resolution of 11 μm, 3-fold higher than the best value achieved for solution-processed infrared upconversion devices. Furthermore, based on solution-phase ligand exchange, a large-area homogeneous 3 × 3 cm upconversion device is fabricated. The large-area device shows an estimated pixel scale of over 7 million pixels, enabling it to be used for direct infrared visualization.
研究领域:
光学工程
·
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Kuibao Yu,Hailong Hu,Yuan Qie,Chao Zhong,Zhihan Lin,Tian Liu,Fushan Li
Near infrared (NIR)-to-visible up-conversion devices (UCDs) offer significant advantages in pixelless bio-imaging and monitoring. Herein, a flexible NIR-to-blue quantum dot (QD) UCD is developed by directly stacking an organic bulk-heterojunction (BHJ) photodetector unit with an environmentally-friendly ZnSe/ZnS QD light-emitting unit in tandem. Aiming at the interconnection layer (ICL) that couples these two units, an Mg-doped ZnO ICL is rationally designed to achieve high conductivity and a low work function, facilitating the rapid transport of photo-generated electrons and their efficient injection into the QD emitting layer. Importantly, Mg-passivated ICL with fewer surface defects alleviates the exciton quenching at the QD/ICL interface and suppresses the undesired charge recombination at the ICL/BHJ interface. The resultant QD-UCDs enable a high photon-to-photon conversion efficiency (? P-P ) of 8.68%, which is ≈3 times higher than that with un-doped ICLs (2.91%). The flexible QD-UCDs can readily measure human heart rate and provide high-contrast microscopic imaging of various biological tissues.
研究领域:
生物医学工程
·
纳米医学
·
光学成像
·
柔性电子学
·
转化医学
·
生物传感器
✓ 已验证
DOI
高影响因子
Light-Science & Applications
·
2025
·Vol. 14
·期 1
·1-10
·
IF 23.4
Mu Ge,Lin Yangye,Fu Kerui,Tang Xin
Biological visions have inspired the development of artificial vision systems with diverse visual functional traits, however, the detected wavelength is only in visible light between 0.4 and 0.78 μm, restricting their applications. Snakes generate a thermal image of animals due to pit organs for detecting and converting infrared, allowing them to accurately target predators or prey even under darkness. Inspired by natural infrared visualized snakes, we propose artificial vision systems with CMOS sensors-integrated upconverters to break visible light limitations to realize 3840 × 2160 ultra-high-resolution short-wave infrared (SWIR) and mid-wave infrared (MWIR) visualization imaging for the first time. Through colloidal quantum dot barrier heterojunction architecture design of infrared detecting units and the introduction of co-hosted emitting units, the luminance and upconversion efficiency reach up to 6388.09 cd m −2 and 6.41% for SWIR, 1311.64 cd m −2 and 4.06% for MWIR at room temperature. Our artificial vision systems broaden a wide spectrum of applications within infrared, such as night vision, agricultural science, and industry inspection, marking a significant advance in bioartificial vision.
研究领域:
生物启发
·
光电子学
·
红外成像
·
传感器技术
·
人工智能
·
材料科学
·
纳米结构
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2023
·Vol. 16
·期 5
·1973
·
IF 3.4
Yuyi Zhang,Chengjun Liu,Xingyu Liu,Ziyu Wei,Hui Tao,Feng Xu,Lixi Wang,Jiangyong Pan,Wei Lei,Jing Chen
Upconversion devices (UCDs) have motivated tremendous research interest with their excellent potential and promising application in photovoltaic sensors, semiconductor wafer detection, biomedicine, and light conversion devices, especially near-infrared-(NIR)-to-visible upconversion devices. In this research, a UCD that directly turned NIR light located at 1050 nm into visible light located at 530 nm was fabricated to investigate the underlying working mechanism of UCDs. The simulation and experimental results of this research proved the existence of the quantum tunneling phenomenon in UCDs and found that the quantum tunneling effect can be enhanced by a localized surface plasmon.
研究领域:
光子学
·
材料科学
·
纳米技术
·
光电技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）