Fig. 5: Flexible TTA-UCCPL films were prepared to demonstrate its long-term chirality and luminescence stability in air and different common solvents and its application was explored.
a Photographs of chiral flexible TTA-UCCPL films under different excitation light sources. 639 nm photoexcitation (top) and 365 nm photoexcitation (bottom). The films from left to right are DPA/PtTPBP (4/600-DPA), 4/600-DPA/BDP ([DPA]/[BDP] = 30,000:4), 4/600-DPA/BDP ([DPA]/[BDP] = 30,000:8), 4/600-DPA/BDP ([DPA]/[BDP] = 30,000:12), 4/600-DPA/BDP ([DPA]/[BDP] = 30000:16), 4/600-DPA/BDP ([DPA]/[BDP] = 30,000:20), BDP/PtTPBP (1/100-BDP). Excited by 639 nm laser, b, c UCPL spectra (b) and glum spectra (c) stability within 7 days were tested. d Photographs of chiral flexible TTA-UCCPL films in different solvents with 639 nm laser. Take the TTA-UC system of BDP/PtTPBP as an example. From left to right, the solvents are n-hexane (Hex), toluene (Tol), dichloroethane (DCE), ethyl acetate (EA), acetone (AC), and methanol (MeOH). Excited by 639 nm laser, e, f UCPL spectra (e) and glum spectra (f) stability within 7 days were tested. g Chiral flexible TTA-UCCPL films with the long-term stability of different UCCPL colors were cut into the desired pattern and combined to form the logo of the NCNST (blue substrate and yellow wings). All error bars show mean ± standard deviation. n = 3 independent experiments.
