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Highly Luminescent π‐Conjugated Terpyridine Derivatives Exhibiting Thermally Activated Delayed Fluorescence
Author(s) -
Sasabe Hisahiro,
Hayasaka Yuya,
Komatsu Ryutaro,
Nakao Kohei,
Kido Junji
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201604303
Subject(s) - terpyridine , fluorescence , luminescence , conjugated system , photochemistry , phosphorescence , quantum efficiency , materials science , absorption (acoustics) , common emitter , chemistry , metal , optoelectronics , optics , polymer , physics , metallurgy , composite material
Typically, luminescent π‐conjugated 2,2′:6′,2′′‐terpyridine (tpy) derivatives are versatile components for tridentate metal ligands, supramolecular materials, two‐photon absorption bioimaging probes, fluorescent ion sensors, and organic light‐emitting devices. However, a limited number of luminescent tpy materials, other than metal complexes, have been reported. This study introduces a series of π‐conjugated tpy derivatives that exhibit strong thermally activated delayed fluorescence (TADF). We have observed that a blue tpy emitter outperforms conventional fluorescent emitters. Additionally, a green tpy emitter has exhibited a performance that is almost comparable to that of its green phosphorescent counterparts, realizing an external quantum efficiency close to 25 % and a power efficiency exceeding 80 lm W −1 with an exceptionally low efficiency roll‐off. This study demonstrates the first example of highly luminescent tpy‐based TADF emitters.