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

A series of starburst materials ( T 1 − T 3 ) bearing a 1,3,5-tri(anthracen-10-yl)benze-ne core ( T 0 ) 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 ( T 1 − T 3 ) possess high glass transition temperatures ( T g ’s) at 107, 109, and 110 °C, and high decomposition temperatures ( T d ’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 T 2 has a maximum brightness of over 3400 cd/m 2 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-blue starburst material devices reported so far in the current available literature.