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

Chin Yiu Chan; Masaki Tanaka; Yi Ting Lee; Yiu Wing Wong; Hajime Nakanotani; Takuji Hatakeyama; Chihaya Adachi

doi:10.1038/s41566-020-00745-z

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

Chin Yiu Chan^*, Masaki Tanaka, Yi Ting Lee, Yiu Wing Wong, Hajime Nakanotani, Takuji Hatakeyama, Chihaya Adachi^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

580 Citations (Scopus)

Abstract

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 (LT₉₅) 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. © The Author(s), under exclusive licence to Springer Nature Limited 2021

Original language	English
Pages (from-to)	203-207
Number of pages	5
Journal	Nature Photonics
Volume	15
Issue number	3
Online published	4 Jan 2021
DOIs	https://doi.org/10.1038/s41566-020-00745-z
Publication status	Published - Mar 2021
Externally published	Yes

Funding

We acknowledge JNC Petrochemical Corporation for synthesizing ν-DABNA. We thank N. Nakamura and K. Kusuhara for technical assistance with this research, and H. Fujimoto, H.-W. Mo and K. Nagayoshi for help in fabricating OLEDs. We also thank Y. Tsuchiya, U. Balijapalli, Y. S. Yang, A. Endo and D. P.-K. Tsang for discussions. This work was supported financially by the Program for Building Regional Innovation Ecosystems of the Ministry of Education, Culture, Sports, Science and Technology, Japan.

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abstract = "Organic light-emitting diodes (OLEDs) are a promising light-source technology for future generations of display1,2. Despite great progress3–12, 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{\textquoteright} 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 (LT95) 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. {\textcopyright} The Author(s), under exclusive licence to Springer Nature Limited 2021",

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AU - Nakanotani, Hajime

AU - Hatakeyama, Takuji

AU - Adachi, Chihaya

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AB - Organic light-emitting diodes (OLEDs) are a promising light-source technology for future generations of display1,2. Despite great progress3–12, 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 (LT95) 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. © The Author(s), under exclusive licence to Springer Nature Limited 2021

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

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