title: Highly efficient organic light-emitting diode based on a hidden thermally activated delayed fluorescence channel in a heptazine derivative.
abstract: An orange-red organic light-emitting diode containing a heptazine derivative exhibits high performance with a maximum external quantum efficiency of 17.5 ± 1.3% and a peak luminance of 17000 ± 1600 cd m⁻² without any light out-coupling enhancement. The high electroluminescence performance can be ascribed to the presence of an efficient up-conversion channel from the lowest triplet state to the lowest singlet state.
authors.affiliation: Department of Applied Chemistry and Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan.
authors.forename: Jie
authors.initials: J
authors.lastname: Li
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Nakagawa
authors.forename: James
authors.initials: J
authors.lastname: MacDonald
authors.forename: Qisheng
authors.initials: Q
authors.lastname: Zhang
authors.forename: Hiroko
authors.initials: H
authors.lastname: Nomura
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Miyazaki
authors.forename: Chihaya
authors.initials: C
authors.lastname: Adachi
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry; D006575:Heterocyclic Compounds, 3-Ring / Q000737:chemistry*; D008027:Light; D008163:Luminescent Measurements / Q000295:instrumentation*; D009930:Organic Chemicals / Q000737:chemistry*; D011789:Quantum Theory; D014227:Triazines / Q000737:chemistry*
chemical_list: D000814:Aniline Compounds; D006575:Heterocyclic Compounds, 3-Ring; D009930:Organic Chemicals; D014227:Triazines; C023650:aniline; C507296:heptazine