Recent Progress of Quantum Dot‐Based Photonic Devices and Systems: A Comprehensive Review of Materials, Devices, and Applications

Abstract

Recently, photonic technologies have attracted lots of interests in the demand of high‐performance sensor devices. In particular, multifunctional photodetectors based on low‐dimensional nanomaterials have enabled to address complex environmental conditions and data processing for wide range of emerging applications, such as soft robotics, biomedical devices, and neuromorphic computing hardware, translating into mechanically flexible platforms that can offer reliable information. Semiconducting quantum dots (QDs) are one of the promising candidates for such photonic applications due to their excellent optical absorption coefficient, wide bandgap tunability, and structural stability as well as high‐throughput production capabilities, such as low‐cost, large‐area, and complementary metal–oxide–semiconductors (CMOS) compatible solution processability. Herein, essential investigations of the emerging photonic devices and systems are presented, focusing on materials, devices, and applications. In addition, diverse hybrid device architectures, which integrate the QD materials with various semiconductors, are fully examined to introduce the newly developed high‐performance wearable photodetectors and neuromorphic applications. Finally, research challenges and opportunities of the QD‐based photonic devices are also discussed, keeping forward‐looking perspective and system points of view.

Defect Engineering in Photocatalytic Methane Conversion

“…As a result, the low‐dimensional materials such as quantum dots, atomically thin nanosheets, usually possess copious defects on the surface. [ 86 ] For instance, oxygen‐vacancy‐rich ultrathin W 18 O 49 nanowires were prepared by a facile one‐pot solvothermal synthesis. [ 87 ] The ultrathin nanowire structure of the W 18 O 49 could allow the exposure of dense unsaturated oxygen atoms on its surface, resulting in the formation of OVs.…”

Rare-earth based materials: an effective toolbox for brain imaging, therapy, monitoring and neuromodulation

“…Other materials with large absorption cross sections can also be applied as an antenna to enhance the luminescent intensity of RENPs 54 . The extinction coefficient of Ag 2 Se quantum dots (QDs) is 2.8 L g −1 cm −1 , which was 530 times higher than that of Yb-RENPs (5.2 × 10 −3 L g −1 cm −1 ) 64 , 72 . The Ag 2 Se QDs sensitized RENPs possessed a 100-fold enhancement in the NIR-II luminescence intensity, enabling clear observation of dynamic cerebrovascular changes in traumatic brain injury (Fig.…”

Aggregation‐induced emission: Red and near‐infrared organic light‐emitting diodes

“…Organic light‐emitting diodes (OLED) have shown promising prospects in display and illumination fields due to the unique advantages such as self‐emitting displays, transparency, fast response time, light weight, flexibility, and low‐cost fabrication 1–11 . Over the last few decades, great progress has been made in achieving highly efficient OLED devices, resulting in the commercialization of television, smartphone, and wearable devices 12–16 .…”