Stable pure-blue hyperfluorescence organic light-emitting diodes with high-efficiency and narrow emission

Organic light-emitting diodes (OLEDs) are a promising light-source technology for future generations of display 1 , 2 . Despite great progress 3 – 12 , it is still challenging to produce blue OLEDs with sufficient colour purity, lifetime and efficiency for applications. Here, we report pure-blue (Co...

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Bibliographic Details
Published in:Nature photonics 2021-03, Vol.15 (3), p.203-207
Main Authors: Chan, Chin-Yiu, Tanaka, Masaki, Lee, Yi-Ting, Wong, Yiu-Wing, Nakanotani, Hajime, Hatakeyama, Takuji, Adachi, Chihaya
Format: Article
Language:English
Subjects:
140/131
639/301/1019/1020/1091
639/638/298/398
Applied and Technical Physics
Efficiency
Emission
Emissions
Emitters
Energy transfer
Fabrication
Fluorescence
Letter
Light emitting diodes
Organic light emitting diodes
Physics
Physics and Astronomy
Quantum efficiency
Quantum Physics
Stability
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Summary:Organic light-emitting diodes (OLEDs) are a promising light-source technology for future generations of display 1 , 2 . Despite great progress 3 – 12 , it is still challenging to produce blue OLEDs with sufficient colour purity, lifetime and efficiency for applications. Here, we report pure-blue (Commission Internationale de l’ Eclairage (CIE) coordinates of 0.13, 0.16) OLEDs with high efficiency (external quantum efficiency of 32 per cent at 1,000 cd m −2 ), narrow emission (full-width at half-maximum of 19 nm) and good stability (95% of the initial luminacnce (LT 95 ) of 18 hours at an initial luminance of 1,000 cd m −2 ). The design is based on a two-unit stacked tandem hyperfluorescence OLED with improved singlet-excited-state energy transfer from a sky-blue assistant dopant exhibiting thermally activated delayed fluorescence (TADF) called hetero-donor-type TADF(HDT-1) to a pure-blue emitter. With stricter control of device fabrication and procedures it is expected that device lifetimes will further improve to rival commercial fluorescent blue OLEDs. Pure-blue organic LEDs with narrow emission and improved stability show promise for display applications.
ISSN:1749-4885
1749-4893
DOI:10.1038/s41566-020-00745-z