Excited-state Engineering Enables Efficient Deep-blue Light-emitting Diodes Exhibiting BT.2020 Color Gamut
This article is protected by copyright. All rights reserved..
Organic luminescent materials that exhibit thermally activated delayed fluorescence (TADF) can convert non-emissive triplet excitons into emissive singlet states through a reverse intersystem crossing (RISC) process. Therefore, they have tremendous potential for applications in organic light-emitting diodes (OLEDs). However, with the development of ultra-high definition 4K/8K display technologies, designing efficient deep-blue TADF materials to achieve the Commission Internationale de l'Éclairage (CIE) coordinates fulfilling BT.2020 remains a significant challenge. Here, we propose an effective approach to design deep-blue TADF molecules based on hybrid long- and short-range charge-transfer by incorporation of multiple donor moieties into organoboron multiple resonance acceptors. The resulting TADF molecule exhibits deep-blue emission at 414 nm with a full width at half maximum (FWHM) of 29 nm, together with a thousand-fold increase in RISC rate. OLEDs based on our champion material achieved a record maximum external quantum efficiency (EQE) of 22.8% with CIE coordinates of (0.163, 0.046), approaching the coordinates of the BT.2020 blue standard. Moreover, TADF-assisted fluorescence devices employing our designed material as a sensitizer exhibited an exceptional EQE of 33.1%. Our work thus provides a blueprint for future development of efficient deep-blue TADF emitters, representing an important milestone towards meeting the blue color gamut standard of BT.2020. This article is protected by copyright. All rights reserved.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2024 |
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| Erschienen: |
2024 |
| Enthalten in: |
Zur Gesamtaufnahme - year:2024 |
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| Enthalten in: |
Advanced materials (Deerfield Beach, Fla.) - (2024) vom: 10. Apr., Seite e2313602 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
An, Rui-Zhi [VerfasserIn] |
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| Links: |
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| Themen: |
Bt.2020 |
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Date Revised 10.04.2024 published: Print-Electronic Citation Status Publisher |
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| doi: |
10.1002/adma.202313602 |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM370881710 |
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| 520 | |a Organic luminescent materials that exhibit thermally activated delayed fluorescence (TADF) can convert non-emissive triplet excitons into emissive singlet states through a reverse intersystem crossing (RISC) process. Therefore, they have tremendous potential for applications in organic light-emitting diodes (OLEDs). However, with the development of ultra-high definition 4K/8K display technologies, designing efficient deep-blue TADF materials to achieve the Commission Internationale de l'Éclairage (CIE) coordinates fulfilling BT.2020 remains a significant challenge. Here, we propose an effective approach to design deep-blue TADF molecules based on hybrid long- and short-range charge-transfer by incorporation of multiple donor moieties into organoboron multiple resonance acceptors. The resulting TADF molecule exhibits deep-blue emission at 414 nm with a full width at half maximum (FWHM) of 29 nm, together with a thousand-fold increase in RISC rate. OLEDs based on our champion material achieved a record maximum external quantum efficiency (EQE) of 22.8% with CIE coordinates of (0.163, 0.046), approaching the coordinates of the BT.2020 blue standard. Moreover, TADF-assisted fluorescence devices employing our designed material as a sensitizer exhibited an exceptional EQE of 33.1%. Our work thus provides a blueprint for future development of efficient deep-blue TADF emitters, representing an important milestone towards meeting the blue color gamut standard of BT.2020. This article is protected by copyright. All rights reserved | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Thermally activated delayed fluorescence | |
| 650 | 4 | |a bt.2020 | |
| 650 | 4 | |a deep‐blue emission | |
| 650 | 4 | |a hybrid long‐ / short‐range charge‐transfer | |
| 650 | 4 | |a organic light‐emitting diodes | |
| 700 | 1 | |a Sun, Yuqi |e verfasserin |4 aut | |
| 700 | 1 | |a Chen, Hao-Yang |e verfasserin |4 aut | |
| 700 | 1 | |a Liu, Yuan |e verfasserin |4 aut | |
| 700 | 1 | |a Privitera, Alberto |e verfasserin |4 aut | |
| 700 | 1 | |a Myers, William K |e verfasserin |4 aut | |
| 700 | 1 | |a Ronson, Tanya K |e verfasserin |4 aut | |
| 700 | 1 | |a Gillett, Alexander J |e verfasserin |4 aut | |
| 700 | 1 | |a Greenham, Neil C |e verfasserin |4 aut | |
| 700 | 1 | |a Cui, Lin-Song |e verfasserin |4 aut | |
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