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Peripheral Decoration of Multi‐Resonance Molecules as a Versatile Approach for Simultaneous Long‐Wavelength and Narrowband Emission
Author(s) -
Qi Yanyu,
Ning Weimin,
Zou Yang,
Cao Xiaosong,
Gong Shaolong,
Yang Chuluo
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202102017
Subject(s) - materials science , full width at half maximum , narrowband , common emitter , oled , optoelectronics , wavelength , emission spectrum , resonance (particle physics) , diode , light emitting diode , photoluminescence , optics , spectral line , nanotechnology , atomic physics , physics , layer (electronics) , astronomy
Abstract High device efficiency and color‐purity are the two essentials for high‐quality organic light‐emitting diodes (OLEDs). Multi‐resonance (MR) molecules show great potentials for high color‐purity OLEDs due to their sharp emission bands. However, most MR molecules exhibit emission limited from deep‐blue to green spectral region. Herein, through peripherally decorating MR emitter with electron donors, a new approach enabling the emission spectra of MR emitters red‐shift while retaining narrowband emission is demonstrated. By manipulating the numbers and electron‐donating abilities of the peripheries, the first narrowband yellow emitter with emission maxima of 562 nm and a full‐width at half‐maximum (FWHM) of 30 nm is realized. Highly efficient OLEDs with an external quantum efficiency of over 24% and excellent color purity are fabricated by employing these newly developed MR molecules as emitters.