Fig. 1. Preparation methods of quantum dots: (a) Molecular beam epitaxy; (b) Electrochemical method^[12]; (c) Magnetron sputtering^[32]; (d) Chemical vapor deposition^[33]; (e) Hot injection method^[34]; (f) Liquid phase ultrasonic method^[12]

Fig. 2. Schematic diagram of composite preparation methods: (a) Microemulsion method; (b) In-situ polymerization method; (c) Sol-gel method; (d) Blending method

Fig. 3. Device development process based on quantum dot-polymer nanocomposites

Fig. 4. (a) Schematic of fabricating CQDs microlaser based on the inkjet printing technique^[84]; (b) QD-WLED structure diagram^[85]; (c) ZnO light-emitting diode device structure diagram^[86]; (d) Device structure with a combined backlight unit using a blue LED chip^[87]; (e) Structure diagram of QLED device prepared by QD/ PTPA-B-CAA^[88]; (f) CPB@SHFW composites structural diagram, upper right illustration is LED^[89]; (g) Structure diagram of white LED prepared by hybrid microspheres of C_SPbBr₃-P QDs and mesoporous polystyrene (MPMs) coated with SiO₂, the inset is a digital photo of the device taken at 10 mA^[26]; (h) Energy band structure diagram of QLED hybrid emitting layer prepared by QD/ PTPA-B-CAA^[88]; (i) Variation of PLQY of CPB@SHFW composite powder with time in water (illustration: material soaked in water for 31 days)^[89]

Fig. 5. Photoelectric detector: (a) Device of Au/CND_S/n-Si ultraviolet photoelectric detector^[93]; (b) N-GQDs photodetector schematic diagram^[93]; (c) Typical Si-QD/Graphene /Si photodetector^[93]; (d) Si NWs array /CuO heterostructure photodetector^[93]; (e) Device structure of the PMDTC ligand^[94]; (f) Schematic diagram of ZnO/P3 HT:PVK photodetector structure, the BCP layer is a composite layer of Quantum dots and polymer^[95]; (g) CdTe and P3 HT photodetector structure^[96]; (h) J-V curve of the device under light irradiation. Higher photocurrent density was observed under reverse bias^[94]; (i) Description of 1 the generation, 2 splitting, 3 hole transport, and electron capture processes of electron-hole pairs in quantum dot polymer composites^[95]