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Triarylamine‐Pyridine‐Carbonitriles for Organic Light‐Emitting Devices with EQE Nearly 40%
Author(s) -
Chen YiKuan,
Jayakumar Jayachandran,
Hsieh ChiaMin,
Wu TienLin,
Liao ChunCheng,
Pandidurai Jayabalan,
Ko ChangLun,
Hung WenYi,
Cheng ChienHong
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202008032
Subject(s) - oled , materials science , intersystem crossing , quantum efficiency , optoelectronics , photoluminescence , pyridine , fluorescence , electrical efficiency , diode , dipole , photochemistry , nanotechnology , power (physics) , optics , layer (electronics) , excited state , atomic physics , chemistry , organic chemistry , physics , quantum mechanics , singlet state
Abstract Highly efficient thermally activated delayed fluorescence (TADF) molecules are in urgent demand for solid‐state lighting and full‐color displays. Here, the design and synthesis of three triarylamine‐pyridine‐carbonitrile‐based TADF compounds, TPAPPC, TPAmPPC, and tTPAmPPC, are shown. They exhibit excellent photoluminescence quantum yields of 79−100% with small Δ E ST values, fast reverse intersystem crossing (RISC), and high horizontal dipole ratios (Θ // = 86−88%) in the thin films leading to the enhancement of device light outcoupling. Consequently, a green organic light‐emitting diode (OLED) based on TPAmPPC shows a high average external quantum efficiency of 38.8 ± 0.6%, a current efficiency of 130.1 ± 2.1 cd A –1 , and a power efficiency of 136.3 ± 2.2 lm W –1 . The highest device efficiency of 39.8% appears to be record‐breaking among TADF‐based OLEDs to date. In addition, the TPAmPPC‐based device shows superior operation lifetime and high‐temperature resistance. It is worth noting that the TPA‐PPC‐based materials have excellent optical properties and the potential for making them strong candidates for TADF practical application.