Fig. 1. Schematic diagram of PDMS solution preparation procedure

Fig. 2. Preparation procedure diagram of microlens-array PDMS coating with CsPbBr₃ QDs

Fig. 3. Fluorescence spectra of PDMS films with different quantum dot concentrations

Fig. 4. Relationship between the photoluminescence intensity and the bending times of the PDMS films(inset: initial state of the film as well as photos under white light and 365 nm light in the bending state)

Fig. 5. Water stability of PDMS films with CsPbBr₃ quantum dots. (a) Relationship between the photoluminescence intensity and the time after the PBCs QDs were immersed in water; (b) photoluminescence spectra of PBCs QDs PDMS films after immersion in water

Fig. 6. Measurement results. (a) Normalized photoluminescence spectra of CsPbBr₃ quantum dots PDMS film with and without microlens array (inset: photo of CsPbBr₃ quantum dots PDMS film with or without microlens array pattern); (b) SEM image of microlens array

Fig. 7. Ray tracing diagram of the lead-cesium bromide quantum dot PDMS film at θ=0°, 30°, and 60°. (a) Micro lens array structure; (b) flat lead-cesium bromide quantum dot PDMS film

Fig. 8. Shape of a 2 μL deionized water on the surface of PDMS with or without microlens array structure. (a) Contact angle of water droplet on PDMS microlens array surface showing 138.6°; (b) contact angle of water droplet on flat PDMS surface showing 96.7°