Cover Feature: Acquiring High‐Performance Deep‐Blue OLED Emitters through an Unexpected Blueshift Color‐Tuning Effect Induced by Electron‐Donating ‐OMe Substituents (Chem. Eur. J. 32/2018)

Using 7-(diphenylamino)-4-(phenoxy)coumarin as the molecular framework, this work reports an unexpected blueshift color-tuning effect induced by moderate EDG -OMe substituents on the phenoxy moiety. With the aid of theoretical calculations, the intrinsic reasons accounting for this -OMe induced color-tuning effect were deciphered. The cover image depicts the unexpected color-tuning effect exerted by methoxy substituents on coumarin fluorophore toward deep-blue OLED materials. More information can be found in the Communication by L. Zhou, Z. Lu et al. on page 8056.