Planar Chiral Multiple Resonance Thermally Activated Delayed Fluorescence Materials for Efficient Circularly Polarized Electroluminescence DOI

Xiang‐Ji Liao,

Dongdong Pu,

Yuan Li

et al.

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 62(6)

Published: Dec. 14, 2022

Chiral boron/nitrogen doped multiple resonance thermally activated delayed fluorescence (MR-TADF) emitters are promising for highly efficient and color-pure circularly polarized organic light-emitting diodes (CP-OLEDs). Herein, we report two pairs of MR-TADF materials (Czp-tBuCzB, Czp-POAB) based on planar chiral paracyclophane with photoluminescence quantum yields up to 98 %. The enantiomers showed symmetric spectra dissymmetry factors |gPL | 1.6×10-3 in films. Meanwhile, the sky-blue CP-OLEDs (R/S)-Czp-tBuCzB an external efficiency 32.1 % narrowest full-width at half-maximum 24 nm among reported CP-OLEDs, while devices (R/S)-Czp-POAB displayed first nearly pure green CP electroluminescence |gEL 10-3 level. These results demonstrate incorporation chirality into emitter is a reliable strategy constructing CP-OLEDs.

Language: Английский

Progress in the development of the display performance of AR, VR, QLED and OLED devices in recent years DOI Creative Commons
Ho Jin Jang, Jun Yeob Lee, Geun Woo Baek

et al.

Journal of Information Display, Journal Year: 2022, Volume and Issue: 23(1), P. 1 - 17

Published: Jan. 2, 2022

The remarkable progress of virtual reality, augmented quantum dot light-emitting diode, and organic diode as next-generation displays has overcome the leadership liquid crystal display during last two years. This paper discusses key technological advancements performance these new-generation devices.

Language: Английский

Citations

138
Achieving 37.1% Green Electroluminescent Efficiency and 0.09 eV Full Width at Half Maximum Based on a Ternary Boron‐Oxygen‐Nitrogen Embedded Polycyclic Aromatic System DOI
Xinliang Cai,

Jianan Xue,

Chenglong Li

et al.

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(23)

Published: March 18, 2022

Abstract Herein, a ternary boron‐oxygen‐nitrogen embedded polycyclic aromatic hydrocarbon with multiple resonance thermally activated delayed fluorescence (MR‐TADF), namely DBNO, is developed by adopting the para boron‐π‐boron and oxygen‐π‐oxygen strategy. The designed molecule presents vivid green emission high photoluminescence quantum yield (96 %) an extremely narrow full width at half maximum (FWHM) of 19 nm/0.09 eV, which surpasses all previously reported TADF emitters to date. In addition, long molecular structure along transition dipole moment direction endows it horizontal emitting ratio 96 %. organic light‐emitting diode (OLED) based on DBNO reveals narrowband peak 504 nm FWHM 24 nm/0.12 eV. Particularly, significantly improved device performance achieved TADF‐sensitization (hyperfluorescence) mechanism, presenting 27 external efficiency (EQE) 37.1

Language: Английский

Citations

123
Multiple‐Resonance‐Induced Thermally Activated Delayed Fluorescence Materials Based on Indolo[3,2,1‐jk]carbazole with an Efficient Narrowband Pure‐Green Electroluminescence DOI

Xu‐Feng Luo,

Shi‐Quan Song,

Hua‐Xiu Ni

et al.

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(41)

Published: Aug. 19, 2022

Herein, we report two multiple-resonance thermally activated delayed fluorescence emitters (VTCzBN and TCz-VTCzBN) based on indolo[3,2,1-jk]carbazole unit boron-nitrogen skeletons, whose emissions peaking at 496 521 nm with full width half maximum of 34 29 nm, respectively. Meanwhile, fast rate constants reverse intersystem crossing above 106 s-1 are obtained due to small singlet-triplet energy gaps large spin-orbital coupling values. Notably, planar molecular structures along the transition dipole moment direction endow them high horizontal emitting ratios up 94 %. Consequently, corresponding organic light-emitting diodes (OLEDs) show external quantum efficiencies 31.7 % 32.2 %, Particularly, OLED TCz-VTCzBN display ultra-pure green emission Commission Internationale de l'Eclairage coordinates (0.22, 0.71), consistent standard National Television System Committee.

Language: Английский

Citations

119
Aggregation‐induced emission: Red and near‐infrared organic light‐emitting diodes DOI Creative Commons

Liangjing Tu,

Yujun Xie, Zhen Li

et al.

SmartMat, Journal Year: 2021, Volume and Issue: 2(3), P. 326 - 346

Published: Aug. 27, 2021

Abstract Red and near‐infrared (NIR) organic light‐emitting diodes (OLED) have gained remarkable interest due to their numerous applications. However, the construction of highly emissive emitters is hampered by energy‐gap law aggregation‐caused quenching (ACQ) effect. Whereas, aggregation‐induced emission (AIE) materials could avoid undesirable ACQ effect emit bright light in aggregated state, which one class most promising fabricate high‐performance OLED with a high external quantum efficiency low roll‐off. This review summarizes recent advances red NIR AIE property, including traditional fluorescence, thermally activated delayed hybridized local charge transfer compounds. Meanwhile, emphasis attention paid molecular design principles, as well structure‐photophysical characteristics. We also briefly further outlook challenges perspective luminogens.

Language: Английский

Citations

118
Chiral Multi‐Resonance TADF Emitters Exhibiting Narrowband Circularly Polarized Electroluminescence with an EQE of 37.2 % DOI

Yiyu Yang,

Nengquan Li, Jingsheng Miao

et al.

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(30)

Published: May 10, 2022

Highly efficient circularly polarized luminescence (CPL) emitters with narrowband emission remain a formidable challenge for OLEDs (CP-OLEDs). Here, promising strategy developing chiral concurrently featuring multi-resonance thermally activated delayed fluorescence (MR-TADF) and electroluminescence (CPEL) is demonstrated by the integration of molecular rigidity, central chirality MR effect. A pair green denoted as (R)-BN-MeIAc (S)-BN-MeIAc designed. Benefited rigid quasi-planar MR-framework, enantiomers not only display mirror-image CPL spectra, but also exhibit TADF properties high photoluminescence quantum yield 96 %, narrow FWHM 30 nm, horizontal dipole orientation 90 % in doped film. Consequently, enantiomer-based CP-OLEDs achieved excellent external efficiencies 37.2 very low efficiency roll-off, representing highest device all reported CP-OLEDs.

Language: Английский

Citations

117
Organoboron-based multiple-resonance emitters: synthesis, structure–property correlations, and prospects DOI Creative Commons
Masashi Mamada, Masahiro Hayakawa, Junki Ochi

et al.

Chemical Society Reviews, Journal Year: 2024, Volume and Issue: 53(3), P. 1624 - 1692

Published: Jan. 1, 2024

This review highlights organoboron-based multiple-resonance compounds’ synthetic strategies classified as one-pot borylation, one-shot and late-stage functionalisation, explores material structure–photophysical property correlations.

Language: Английский

Citations

117
A Chiral Dual‐Core Organoboron Structure Realizes Dual‐Channel Enhanced Ultrapure Blue Emission and Highly Efficient Circularly Polarized Electroluminescence DOI
Zhi‐Ping Yan, Yuan Li, Yuan Zhang

et al.

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(36)

Published: July 15, 2022

The realization of luminescent materials with narrowband and circularly polarized luminescence (CPL) is great significance for the development future optical photonic devices. Herein, through a steric-hindrance-assisted dual-core strategy, two pairs chiral multiple resonance thermally activated delayed fluorescence (MR-TADF) (R/S-DOBN R/S-DOBNT) are directly constructed by bonding organoboron MR-TADF monocores (SOBN SOBNT) carbazole/3,6-di-tert-butyl-9H-carbazole phenol derivative as donors, realizing obvious CPL emissions. Furthermore, effect in prepared R/S-DOBN R/S-DOBNT increases transition oscillator strength times more than that monocore structure, while maintaining ultrapure blue emissions peaking at 453 459 nm narrower full-width half-maximum 21 reorganization energy reduction. organic light-emitting diodes based on enantiomers exhibit emission Commission Internationale de L'Eclairage (CIE) coordinates (0.14, 0.10) (0.13, 0.12), high maximum external quantum efficiencies 23.9% 25.6%, electroluminescence dissymmetry factors (|gEL |) ≈ 10-3 .

Language: Английский

Citations

116
Solution‐Processable Pure‐Red Multiple Resonance‐induced Thermally Activated Delayed Fluorescence Emitter for Organic Light‐Emitting Diode with External Quantum Efficiency over 20 % DOI
Xinliang Cai, Yincai Xu, Yue Pan

et al.

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 62(7)

Published: Dec. 13, 2022

Abstract Developing solution‐processable red organic light‐emitting diodes (OLEDs) with high color purity and efficiency based on multiple resonance thermally activated delayed fluorescence (MR‐TADF) is a formidable challenge. Herein, by introducing auxiliary electron donor acceptor moieties into the highest occupied molecular orbital (HOMO) lowest unoccupied (LUMO) distributed positions of skeleton simultaneously, an effective strategy to obtain MR‐TADF emitters was represented. The proof‐of‐the‐concept molecule BN‐R exhibits narrowband pure‐red emission at 624 nm, luminous 94 % narrow bandwidth 46 nm. Notably, fabricated OLED state‐of‐the‐art external quantum over 20 Commission Internationale de I’Éclairage coordinates (0.663, 0.337) long operational lifetime (LT 50 ) 1088 hours initial luminance 1000 cd m −2 .

Language: Английский

Citations

113
Sequential Multiple Borylation Toward an Ultrapure Green Thermally Activated Delayed Fluorescence Material DOI

Shigetada Uemura,

Susumu Oda, Masahiro Hayakawa

et al.

Journal of the American Chemical Society, Journal Year: 2022, Volume and Issue: 145(3), P. 1505 - 1511

Published: Dec. 22, 2022

Multiple-resonance thermally activated delayed fluorescence (MR-TADF) emitters have emerged as an important component of organic light-emitting diodes (OLEDs) because their narrowband emission and high exciton utilization efficiency. However, the chemical space MR-TADF remains mostly unexplored lack suitable synthetic protocols. Herein, we demonstrate a sequential multiple borylation reaction that provides new synthetically accessible space. ω-DABNA, proof-of-concept material, exhibited green TADF with full width at half-maximum 22 nm small singlet-triplet energy gap 13 meV. The OLED employing it emitter electroluminescence 512 nm, Commission International de l'Éclairage coordinates (0.13, 0.73) external quantum efficiency (EQE) 31.1%. Moreover, device showed minimum roll-off, EQE 29.4% 1000 cd m-2.

Language: Английский

Citations

105
Constructing Organic Electroluminescent Material with Very High Color Purity and Efficiency Based on Polycyclization of the Multiple Resonance Parent Core DOI
Yincai Xu, Qingyang Wang, Jinbei Wei

et al.

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(30)

Published: May 6, 2022

Multiple resonance thermally activated delayed fluorescence (MR-TADF) compounds have set off an upsurge of research because their tremendous application prospects in the field wide color gamut display. Herein, we propose a novel MR-TADF molecular construction paradigm based on polycyclization multiple parent core, and construct representative polycyclic aromatic hydrocarbon (MR-PAH) para-alignment boron nitrogen atoms into six-membered ring (p-BNR). Through retrosynthesis analysis, concise synthesis strategy with applicability has been proposed, encompassing programmed sequential esterification, Suzuki coupling Scholl oxidative coupling. The target model molecule BN-TP shows green emission peak at 523 nm narrow full-width half-maximum (FWHM) 34 nm. organic light-emitting diode (OLED) employing as emitter exhibits ultrapure Commission Internationale de L'Eclairage (CIE) coordinates (0.26, 0.70), achieves maximum external quantum efficiency (EQE) 35.1 %.

Language: Английский

Citations

99