Novel Deep Blue OLED Emitters with 1,3,5-Tri(anthracen-10-yl)benzene-Centered Starburst Oligofluorenes

Abstract

A series of starburst materials (T1−T3) bearing a 1,3,5-tri(anthracen-10-yl)benze-ne core (T0) and three oligofluorenes arms have been synthesized and characterized. Single-crystal diffraction analysis has shown that the core of these starburst materials possess a propeller twist topology, which made the starburst materials exhibit good film-forming capabilities and display deep blue emission both in solution and in the thin solid film. The compounds (T1−T3) possess high glass transition temperatures (Tg’s) at 107, 109, and 110 °C, and high decomposition temperatures (Td’s) at 438, 440, and 434 °C, respectively. In addition, the double-layered devices fabricated with the three materials as the emitter show a stable deep-blue emission and the device performance increases with arm length at some extent. The double-layered device based on T2 has a maximum brightness of over 3400 cd/m2 and a maximum current efficiency of 1.80 cd/A with CIE coordinates of (0.149, 0.098), which is among the best of the deep-blu...