New Dopant and Host Materials for Blue‐Light‐Emitting Phosphorescent Organic Electroluminescent Devices

Efficient organic light-emitting diodes (OLEDs) incorporating IrIII bis(4,6-difluorophenylpyridinato)-3-(trifluoromethyl)-5- (pyridin-2-yl)-1,2,4-triazolate (FIrtaz) and IrIII bis(4,6-difluorophenylpyridinato)-5-(pyridin-2-yl)-1H-tetrazolate (FIrN4) demonstrate higher-purity blue-light emission than the long-known IrIII bis(4,6-difluorophenylpyridinato)picolate (FIrpic) phosphorophore. New host materials with higher glass-transition temperatures were also found to enhance the OLED performance.