Acceptor engineering for color modification in D-O-A based pure organic room-temperature electrophosphorescent polymers

Abstract

A series of donor-oxygen-acceptor (D-O-A) type polymers have been newly designed and synthesized, where benzophenone, 1,3-bis(phenylmethanone)phenylene or 1,4-bis(phenylmethanone)-phenylene is selected as the acceptor combined with the acridine donor through an oxygen linkage. The characteristic geometry endows them with obvious phosphorescence at room temperature for both the neat and doped films. Meanwhile, their emission colors can be finely tuned with the increasing electron withdrawing of the acceptor. As a consequence, the corresponding polymer light-emitting diodes achieve a bright sky-blue, green and yellow electroluminescence peaked at 482, 502 and 547 nm, respectively. The color modification via acceptor engineering clearly highlights the great universality and potential of the D-O-A design for efficient pure organic room-temperature electrophosphorescent polymers.