Efficient blue phosphorescent host through nonbonded conformational locking interactions†
We developed a new host material TCTEB with a conformationally homogeneous, sterically bulky structure due to nonbonded interactions between adjacent methylene groups. The host presented good thermal stability (Tg = 122 °C and Td = 321 °C) and high triplet energy (3.0 eV). The maximum quantum efficiency, current efficiency and power efficiency of the OLED device using the TCTEB host were 8.5%, 13.7 cd A−1, and 11.3 lm W−1, respectively, when doped with 8 wt% FIrpic.
- This article is part of the themed collection: Bio-inspired materials