Fig. 1: Molecular structure and stead-state characterisation of TTBP.
From: Singlet exciton fission in a modified acene with improved stability and high photoluminescence yield
a Molecular structure of TIPS-tetrabenzo[a,c,l,n]pentacene (TTBP). b Schematic energy level diagram for endothermic singlet fission in TTBP. c Absorption spectrum of a pure TTBP film (blue) and a 15% blend of TTBP in polystyrene (red) at room temperature. The measured absorption at wavelengths longer than ~600 nm is due to scattering and reflectance. d Temperature-dependent time-integrated photoluminescence, using a pulsed excitation source at 500 nm, pulse duration 200 fs, 1 kHz repetition, from 11 K to room temperature. Colours blue to red indicate temperature, from lowest (11 K) to highest (290 K).
