A new blue light‐emitting oligofluorene glass: synthesis, characterization and photophysical properties

The synthesis, electrochemical, thermal and spectroscopic properties of the oligoaminofluorene derivative 9,9‐didecyl‐ N , N ‐bis(9,9‐didecyl‐7‐ N , N ‐diphenylaminofluoren‐2‐yl)‐ N , N ‐diphenylfluorene‐2,7‐diamine ( 4 ), an organic glass, were investigated in solvents of differing polarity at room and 77 K temperature, including quantum yield and lifetime. The oligomer exhibited a glass transition near room temperature and was thermally stable to ca 400 °C. Intramolecular interactions between the fluorenyl chromophores were investigated. The relatively complex nature of the emission band of 4 was characterized by reduced anisotropy and two components in its fluorescence decay at room temperature. Emission spectra of 4 at 77 K exhibited a single component in its fluorescence decay and a dependence on the excitation wavelength at the red edge of the absorption band. A spectroscopic model of 4 is proposed to explain the observed spectral behavior of this potentially important electroluminescent material.