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

Research output: Contribution to journal › Article › peer-review

333 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.

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

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics

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10.1038/s41566-020-00745-z

Cite this

@article{680e2711ec3a4198aad01191b278c976,

title = "Stable pure-blue hyperfluorescence organic light-emitting diodes with high-efficiency and narrow emission",

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.",

author = "Chan, {Chin Yiu} and Masaki Tanaka and Lee, {Yi Ting} and Wong, {Yiu Wing} and Hajime Nakanotani and Takuji Hatakeyama and Chihaya Adachi",

note = "Funding Information: 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. Publisher Copyright: {\textcopyright} 2021, The Author(s), under exclusive licence to Springer Nature Limited.",

year = "2021",

month = mar,

doi = "10.1038/s41566-020-00745-z",

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AU - Chan, Chin Yiu

AU - Tanaka, Masaki

AU - Lee, Yi Ting

AU - Wong, Yiu Wing

AU - Nakanotani, Hajime

AU - Hatakeyama, Takuji

AU - Adachi, Chihaya

N1 - Funding Information: 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. Publisher Copyright: © 2021, The Author(s), under exclusive licence to Springer Nature Limited.

PY - 2021/3

Y1 - 2021/3

N2 - 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.

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.

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

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