Peripheral Decoration of Multi‐Resonance Molecules as a Versatile Approach for Simultaneous Long‐Wavelength and Narrowband Emission

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‐blu...

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Bibliographic Details
Published in:Advanced functional materials 2021-07, Vol.31 (29), p.n/a
Main Authors: Qi, Yanyu, Ning, Weimin, Zou, Yang, Cao, Xiaosong, Gong, Shaolong, Yang, Chuluo
Format: Article
Language:English
Subjects:
Color
color‐purity
Emission spectra
Emissions control
Emitters
Emitters (electron)
Materials science
multi‐resonance
Narrowband
narrowband emission
Organic light emitting diodes
Purity
Quantum efficiency
Resonance
Spectral emittance
thermally activated delayed fluorescence
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Summary: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. This work demonstrates a versatile approach by peripheral decoration of multi‐resonance molecules, which enables emission spectra red‐shift while remains narrowband emission. Fully decorating the parent BNCz molecules with diphenylamine gives the first narrowband yellow emissive MR emitter with an emission maxima of 562 nm. Electroluminescence devices employing these MR emitters reveal narrowband emission with high external quantum efficiency of over 24%.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202102017