Three-Dimensional Structures Based on the Fusion of Chrysene and Spirobifluorene Chromophores for the Development of Blue OLEDs

A new deep-blue chromophore containing
a three-dimensionally (3D)
shaped CS core composed of fused chrysene and spirofluorene units
is synthesized. A pair of m-terphenyl (TP) units
is also substituted onto the CS core at two different sets of positions
to form two additional compounds: CS–TPTP and TP–CS–TP.
The TP–CS–TP compound showed the highest efficiency
with an external quantum efficiency (EQE) of 3.05% and Commission
Internationale de L’Eclairage coordinates (CIE) of (0.148,
0.098) corresponding to the emission of blue light. This approach
for forming a new chromophore is expected to lead to the development
of functional organic materials with excellent characteristics.