Cover Feature: Versatile Host Materials for Highly‐Efficient Green, Red Phosphorescent and White Organic Light‐Emitting Diodes (ChemElectroChem 23/2019).

Cover Feature: Versatile Host Materials for Highly-Efficient Green, Red Phosphorescent and White Organic Light-Emitting Diodes (ChemElectroChem 23/2019) B The Cover Feature b shows two novel organic deep-blue electroluminescence materials, which could also be used as versatile host materials for highly efficient green, red phosphorescent and white organic light-emitting diodes (OLEDs), simultaneously. Versatile host materials, organic light-emitting diodes, phosphorescence, indolo[3,2,1-jk]carbazole, low roll-off. [Extracted from the article]