Fig. 1. TPE absorption and fluorescence spectra. The inset shows the TPE molecule structure.

Fig. 2. (a) Schematic of setup used to manufacture the films and (b) the result of optical tape film.

Fig. 3. Normalized fluorescence intensities of solid films of different curing times.

Fig. 4. Recording and readout result of six recording layers under two-photon illumination in the photobleaching polymer. The spacing between adjacent layers is 2.5 μm. (a) The first layer, also the lowest layer, including the digit number 1; (b) the second layer, including the digit number 2; (c) the third layer, including the digit number 3; (d) the fourth layer, including the digit number 4; (e) the fifth layer, including the digit number 5; (f) the sixth layer, also the topmost layer, including the digit number 6.

Fig. 5. Fluorescent signals of different storage depths.