Fig. 6

Spectral characterization of BA, BN, and (BA)0.72(BN)0.28 helical assemblies. a Normalized absorption and PL spectra of (blue curves) BA and (red curves) BN monomer solutions in THF. Inset shows the corresponding photographs when excited by 365 nm. b Normalized absorption and PL spectra of (blue curves) BA tubes, (green curves) (BA)0.72(BN)0.28 helices, and (red curves) BN tubes