title: Nearly 100% internal quantum efficiency in undoped electroluminescent devices employing pure organic emitters.
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.
authors: Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan; JST, ERATO, Adachi Molecular Exciton Engineering Project c/o Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.
authors: Qisheng
authors: Q
authors: Zhang
authors: Daniel
authors: D
authors: Tsang
authors: Hirokazu
authors: H
authors: Kuwabara
authors: Yasuhiro
authors: Y
authors: Hatae
authors: Bo
authors: B
authors: Li
authors: Takehiro
authors: T
authors: Takahashi
authors: Sae Youn
authors: SY
authors: Lee
authors: Takuma
authors: T
authors: Yasuda
authors: Chihaya
authors: C
authors: Adachi
keywords: electroluminescence; organic light-emitting diodes; thermally activated delayed fluorescence; undoped materials