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2024 Vol. 7, No. 6
Cover story: Sharbirin AS, Kong RE, Mato WB et al. Highly enhanced UV absorption and light emission of monolayer WS2 through hybridizationwith Ti2N MXene quantum dots and g-C3N4 quantum dots. Opto-Electron Adv 7, 240029 (2024).
Two-dimensional (2D) transition metal dichalcogenides (TMDs), like monolayer tungsten disulfide (1L-WS2), offer exciting electronic and optical properties for diverse applications. However, their limited light absorption, particularly in the ultraviolet (UV) range, hinders their performance in UV-related technologies such as LEDs and photodetectors. Addressing this challenge is crucial for maximizing their potential in UV applications. Recently, Professor Jeongyong Kim's research group at Sungkyunkwan University (SKKU) reported a highly enhanced light emission from 1L-WS2 by combining it with titanium nitride MXene quantum dots (Ti2N MQDs) and graphitic carbon nitride quantum dots (GCNQDs). These quantum dots were chosen for their strong UV absorption and eco-friendly properties. After synthesizing them and preparing 1L-WS2 flakes, we integrated them with the QDs, facilitating efficient energy transfer and enhancing UV light absorption and emission. Our experiments revealed a significant increase in light emission intensity, with Ti2N MQDs enhancing it by 15 times and GCNQDs by 11 times under 300 nm UV light excitation. This approach overcomes 1L-WS2's limitations in UV interaction, promising advancements in UV optoelectronics and other fields, benefiting from the environmental friendliness of the quantum dots used.
Back cover story: Xu X, Luo Q, Wang JX et al. Large-field objective lens for multi-wavelength microscopy at mesoscale and submicron resolution. Opto-Electron Adv 7, 230212 (2024)
Optical microscopes are important tools in life science research, but their two key parameters: imaging field of view (FOV) and resolution are constrained by the objective lens. Commercially available objective lenses that can image at submicron resolution usually have an FOV of about 1 mm diameter with a numerical aperture of 0.5. As the demand for high-throughput, multi-scale imaging continues to grow, such as brain mapping, cross-regional brain functional imaging, conventional microscope objectives have difficulty meeting the requirements for large field of view and high resolution simultaneously. Recently, Professor Guohua Shi in Jiangsu Key Laboratory of Medical Optics at Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences reported a mesoscopic objective lens with a FOV of 8 mm, numerical aperture of 0.5, and working wavelength range from 400 to 1000 nm. This objective is currently the world's largest imaging FOV at sub-micrometer resolution, and has the widest working wavelength range that can cover commonly used one- and two-photon imaging wavelength band. This mesoscopic microscope objective can be applied to microscale imaging systems for large-scale samples, and is particularly well-suited for in vivo brain imaging research in neuroscience. It also has broad prospects in fields with high-throughput imaging needs, such as developmental biology, oncology, and organoid research.
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Prof. Xiangang Luo
