Zhao Niobium of the Chinese University of Hong Kong, Li Cheng and Chen Mengyu AS of Xiamen University: integration of Colloidal Quantum Dots and Optical structure
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In the new semiconductor materials which can be processed in liquid phase at low temperature, colloidal quantum dots have excellent luminescence and absorption properties. Its photoluminescence yield is high, the light stability is good, the band gap is adjustable from ultraviolet to far infrared, and the specific surface area is large, so it can achieve a variety of surface modification and functionalization. In addition, the synthesis and processing of colloidal quantum dots are flexible and diverse. It can be perfectly combined with optical structure, and the interaction between photons and quantum dots can be greatly enhanced through reasonable optical structure design, so as to improve the performance of quantum dot optical devices and optoelectronic devices. combining colloidal quantum dots with optical structures is an effective way to develop high-performance and low-cost optoelectronic devices. 




Based on this, the team of Professor Zhao Niobium of the Chinese University of Hong Kong and the team of Professor Li Cheng and Assistant Professor Chen Mengyu of Xiamen University published a review on the combination of colloidal quantum dots with photonic structures and their applications in optical and optoelectronic devices on Advanced Science. 

This review mainly introduces the combination of colloidal quantum dots with four typical optical structures (diffraction grating, resonant cavity, plasma structure and photonic crystal) to regulate the luminescence and absorption properties of colloidal quantum dot optoelectronic devices. Firstly, the optical properties of four kinds of optical structures are introduced, and the interaction between optical structures and colloidal quantum dots is explained theoretically to enhance the performance of quantum dot optoelectronic devices. According to different application needs, the methods of integrating colloidal quantum dots with optical structures are enumerated, and the application examples of successful combination of colloidal quantum dots and optical structures are summarized. The combination of colloidal quantum dots and optical structures can not only improve the performance of light-absorbing devices (such as solar cells, photodetectors) and light-emitting devices (such as LED, color conversion and lasers), but also realize functionalized polarization or wavelength adjustable optoelectronic detection and novel light-emitting devices with controllable light direction, polarization, wavelength and spontaneous emission rate. In this paper, the latest progress in the application of the combination of colloidal quantum dots and optical devices in hyperspectral detection, patterned luminescence and dual-wavelength lasers is enumerated. The new research progress in the application of active passive optical devices in on-chip optical integrated circuits based on the combination of colloidal quantum dots and optical structures is briefly summarized. Finally, the paper summarizes the advantages and challenges of the combination of new optoelectronic materials and optical structures which can be treated in low temperature liquid phase. 





Fig. 1 the combination of colloidal quantum dots with four optical structures and their applications in a variety of optoelectronic and optical devices, as well as on-chip integrated optical chips. 

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