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Advanced materials (Deerfield Beach, Fla.)

Nearly 100% internal quantum efficiency in undoped electroluminescent devices employing pure organic emitters.


PMID 25678335

Abstract

The design of efficient and concentration-insensitive metal-free thermally activateddelayed fluorescence (TADF) materials is reported. Blue and green organic light-emitting diodes (OLEDs) containing a hole-transport layer, an undoped TADF emissive layer, and an electron-transport layer achieve maximum external quantum efficiencies of 19%, which is comparable to the best doped OLEDs.