Laser scanning confocal microscope (LSCM) images showing the complex patterns obtained via the light direct-writing method. (a) 3D school badge of Shanghai Jiao Tong University. The intensity and exposure time of 365 nm UV light were ≈50 mW/cm2 and 30 seconds, respectively. (b) 3D “QR Code” with fluorescence under UV light. The thickness of the polymer blend film was ≈200 μm. The intensity and exposure time of 365 nm UV light were ≈50 mW/cm2 and 25 seconds, respectively.