Franca, L. G. ; Dos Santos, P. L. ; Pander, P. ; Cabral, M. {\'ılia G. B. ; Cristiano, R. ; Cazati, T. ; Monkman, A. P. ; Bock, H. ; Eccher, J. Delayed Fluorescence by Triplet–Triplet Annihilation from Columnar Liquid Crystal Films. ACS Applied Electronic Materials 2022, 4 3486–3494.