Fig. 1. Schematic diagram of nano-ZnO seed layer grown by sputtering deposition on zinc foil

Fig. 2. X-ray diffraction pattern of nano-ZnO seed layer on zinc foil

Fig. 3. Scanning electron microscope images of hydrothermal synthesized ZnO nanowire arrays with the concentrations of the precursor hexa methine group tetramine and zinc acetate dihydrate are 10 mmol/L ((a)-(b)), 15 mmol/L ((c)-(d)) and 20 mmol/L ((e)-(f))

Fig. 4. Photoluminescence spectrum of ZnO nanowire arrays grown on zinc foil substrates

Fig. 5. X-ray diffraction pattern of ZnO nanowire arrays on zinc foil substrate

Fig. 6. Scanning electron microscopy photos of ZnO nanowire arrays deposited with MgO film layers

Fig. 7. X-ray diffraction pattern of ZnO/MgO nanowire arrays heterostructure

Fig. 8. Photoluminescence spectra of ZnO nanowire arrays uncoated and coated with MgO film layers

Fig. 9. Structural schematic diagram (a) and photo (b) of ZnO/MgO nanowire array MIS junction light emitting devices

Fig. 10. (a) Electroluminescence spectra of nanowire heterojunction flexible devices and (b) the relationship between the intensity of electroluminescence and the forward bias voltage

Fig. 11. (a) Transmission electron microscopy photos of CsPbBr₃ quantum dots and (b) photoluminescence spectrum of CsPbBr₃ quantum dots

Fig. 12. (a) Transmission electron microscopy photos of CsPbI₃ quantum dots and (b) photoluminescence spectrum of CsPbI₃ quantum dots

Fig. 13. Schematic diagram of ZnO nanowire/CsPbX₃ quantum dots composite flexible light-emitting device

Fig. 14. Electroluminescence spectra of nanowire/quantum dots composite flexible light-emitting device and CIExy chromatic coordinate diagram