Tunable Nano‐Bending Structures of Loosened/Tightened Lassos with Bi‐Stable Vibration‐Induced Emissions for Multi‐Manipulations of White‐Light Emissions and Sensor Applications DOI

Nguyen Thanh Trung,

Chun‐Hao Chiu,

Tu Thi Kim Cuc

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(28)

Published: Jan. 19, 2024

Abstract The first tunable nano‐bending structures of [1]rotaxane containing a single‐fluorophoric N,N ′‐diphenyl‐dihydrodibenzo[ a,c ]phenazine (DPAC) moiety (i.e., [1]RA ) are developed as loosened lasso structure to feature the bright white‐light emission [CIE (0.27, 0.33), Φ = 21.2%] in THF solution, where bi‐stable states bending and twisted DPAC unit produce cyan orange emissions at 480 600 nm, respectively. With acid/base controls, loosened/tightened nano‐loops corresponding [1]rotaxanes / [1]RB can be achieved via shuttling macrocycles reversibly, thus adjust their respective white‐light/cyan emissions, is obtained due largest conformational constraint its form with tightened structure. Additionally, non‐interlocked analog M‐Boc only shows emission, revealing fluorophore without any constraint. Moreover, utilization solvents (with different viscosities polarities), temperatures, water fractions could serve effective tools vibration‐induced (VIE) colors [1]rotaxanes. Finally, tuning ratiometric adaptive conformations moieties by altering external stimuli further intelligent temperature viscosity sensor materials.

Language: Английский

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

118
Synergetic Modulation of Steric Hindrance and Excited State for Anti‐Quenching and Fast Spin‐Flip Multi‐Resonance Thermally Activated Delayed Fluorophore DOI

Jia‐Ming Jin,

Denghui Liu,

Wen‐Cheng Chen

et al.

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(16)

Published: Feb. 8, 2024

Multi-resonance thermally activated delayed fluorescence (MR-TADF) materials hold great promise for advanced high-resolution organic light-emitting diode (OLED) displays. However, persistent challenges, such as severe aggregation-caused quenching (ACQ) and slow spin-flip, hinder their optimal performance. We propose a synergetic steric-hindrance excited-state modulation strategy MR-TADF emitters, which is demonstrated by two blue IDAD-BNCz TIDAD-BNCz, bearing sterically demanding 8,8-diphenyl-8H-indolo[3,2,1-de]acridine (IDAD) 3,6-di-tert-butyl-8,8-diphenyl-8H-indolo[3,2,1-de]acridine (TIDAD), respectively. These rigid bulky IDAD/TIDAD moieties, with appropriate electron-donating capabilities, not only effectively mitigate ACQ, ensuring efficient luminescence across broad range of dopant concentrations, but also induce high-lying charge-transfer excited states that facilitate triplet-to-singlet spin-flip without causing undesired emission redshift or spectral broadening. Consequently, implementation high doping level resulted in highly narrowband electroluminescence, featuring remarkable full-width at half-maximum 34 nm record-setting external quantum efficiencies 34.3 % 31.8 maximum 100 cd m

Language: Английский

Citations

36
Highly efficient pure-blue organic light-emitting diodes based on rationally designed heterocyclic phenophosphazinine-containing emitters DOI Creative Commons

Longjiang Xing,

Jianghui Wang, Wen‐Cheng Chen

et al.

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: July 22, 2024

Abstract Multi-resonance thermally activated delayed fluorophores have been actively studied for high-resolution photonic applications due to their exceptional color purity. However, these compounds encounter challenges associated with the inefficient spin-flip process, compromising device performance. Herein, we report two pure-blue emitters based on an organoboron multi-resonance core, incorporating a conformationally flexible donor, 10-phenyl-5 H -phenophosphazinine 10-oxide (or sulfide). This design concept selectively modifies orbital type of high-lying excited states charge transfer configuration while simultaneously providing necessary conformational freedom enhance density without sacrificing We show that different embedded phosphorus motifs (phosphine oxide/sulfide) donor can finely tune electronic structure and freedom, resulting in accelerated process through intense spin-vibronic coupling, achieving over 20-fold increase reverse intersystem crossing rate compared parent emitter. Utilizing emitters, achieve high-performance organic light-emitting diodes, showcasing top-tier external quantum efficiency 37.6% reduced roll-offs. proposed strategy not only conventional notion electron-donors are undesirable constructing narrowband but also offer pathway designing efficient narrow-spectrum blue diodes.

Language: Английский

Citations

28
Regulation of Multiple Resonance Delayed Fluorescence via Through‐Space Charge Transfer Excited State towards High‐Efficiency and Stable Narrowband Electroluminescence DOI
Sai Luo, Junjie Wang, Nengquan Li

et al.

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(49)

Published: Oct. 18, 2023

B- and N-embedded multiple resonance (MR) type thermally activated delayed fluorescence (TADF) emitters usually suffer from slow reverse intersystem crossing (RISC) process aggregation-caused emission quenching. Here, we report the design of a sandwich structure by placing B-N MR core between two electron-donating moieties, inducing through-space charge transfer (TSCT) states. The proper adjusting energy levels brings about 10-fold higher RISC rate in comparison with parent molecule. In meantime, high photoluminescence quantum yield 91 % good color purity were maintained. Organic light-emitting diodes based on new emitter achieved maximum external efficiency 31.7 small roll-offs at brightness. High device efficiencies also obtained for wide range doping concentrations up to 20 wt thanks steric shielding core. A operational stability LT95 85.2 h has been revealed. dual electronic effects resulting introduction TSCT state offer an effective molecular address critical challenges MR-TADF emitters.

Language: Английский

Citations

38
Frontier Molecular Orbital Engineering: Constructing Highly Efficient Narrowband Organic Electroluminescent Materials DOI Open Access
Yincai Xu, Qingyang Wang, Xinliang Cai

et al.

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(52)

Published: Sept. 19, 2023

Abstract It is of great strategic significance to develop highly efficient narrowband organic electroluminescent materials that can be utilized manufacture ultra‐high‐definition (UHD) displays and meet or approach the requirements Broadcast Television 2020 (B.T.2020) color gamut standards. This motif poses challenges for molecular design synthesis, especially developing generality, diversity, scalability, robustness structures. The emergence multiple resonance thermally activated delayed fluorescence (MR‐TADF) emitters has ingeniously solved problems demonstrated bright application prospects in field UHD displays, sparking a research boom. Minireview summarizes endeavors materials, with emphasis on tremendous contribution frontier orbital engineering (FMOE) strategy. combines outstanding advantages MR framework donor‐acceptor (D−A) structure, achieve red‐shift emission simultaneously, which development long‐wavelength maxima exceeding 500 nm. We hope this would provide some inspiration what could transpire future.

Language: Английский

Citations

35
Combining Carbazole Building Blocks and ν‐DABNA Heteroatom Alignment for a Double Boron‐Embedded MR‐TADF Emitter with Improved Performance DOI
Feng Huang, Xiao‐Chun Fan,

Ying‐Chun Cheng

et al.

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(32)

Published: June 13, 2023

Building blocks and heteroatom alignments are two determining factors in designing multiple resonance (MR)-type thermally activated delayed fluorescence (TADF) emitters. Carbazole-fused MR emitters, represented by CzBN derivatives, the of ν-DABNA star series MR-TADF emitters that show impressive performances from aspects building alignments, respectively. Herein, a novel analog, Π-CzBN, featuring alignment is developed via facile one-shot lithium-free borylation. Π-CzBN exhibits superior photophysical properties with photoluminescence quantum yield close to 100 % narrowband sky blue emission full width at half maximum (FWHM) 16 nm/85 meV. It also gives efficient TADF small singlet-triplet energy offset 40 meV fast reverse intersystem crossing rate 2.9×105 s-1 . The optimized OLED using as emitter achieves an exceptional external efficiency 39.3 low roll-off 20 1000 cd m-2 495 nm FWHM 21 nm/106 meV, making it one best reported devices based on comprehensive performance.

Language: Английский

Citations

30
Hanging heavy atom-containing chains onto a multiple resonance framework: Influence on the TADF properties and device performances DOI
Feng Huang,

Ying-Chun Cheng,

Hao Wu

et al.

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 465, P. 142900 - 142900

Published: April 10, 2023

Language: Английский

Citations

28
Boron‐Dipyrromethene‐Based Fluorescent Emitters Enable High‐Performance Narrowband Red Organic Light‐Emitting Diodes DOI
Jiahui Liu, Junjie Liu, Haoyuan Li

et al.

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(31)

Published: June 8, 2023

Narrowband organic light-emitting diodes (OLEDs) are receiving significant attention and have demonstrated impressive performance in blue green OLEDs. However, developing high-performance narrowband red OLEDs remains a highly desired yet challenging task. Herein, we developed fluorescent emitters by utilizing boron-dipyrromethene (BODIPY) skeleton combination with methyl-shield strategy. These exhibit small full-width at half-maxima (FWHM) ranging from 21 nm (0.068 eV) to 25 (0.081 high photoluminescence quantum yields (ΦPL ) 88.5 % 99.0 toluene solution. Using BODIPY-based luminescent materials as emitters, been assembled external efficiency 18.3 623 21.1 604 nm. This work represents, our knowledge, the first successful case of achieving NTSC pure-red Commission Internationale de l'Éclairage (CIE) coordinates [0.67, 0.33] based on conventional emitters.

Language: Английский

Citations

24
Recent Progress of Thermally Activated Delayed Fluorescent Materials with Narrowband Red, Green, and Blue (RGB) Emission DOI
Ping Li, Wenjing Li, Yewen Zhang

et al.

ACS Materials Letters, Journal Year: 2024, Volume and Issue: 6(5), P. 1746 - 1768

Published: April 2, 2024

Narrowband thermally activated delayed fluorescence (TADF) materials have received widespread attention due to their promising applications in organic light-emitting diodes with high-definition displays. Great efforts been done achieve full-color narrowband emissions donor–acceptor (D–A) and multiple-resonance (MR) TADF materials. In comparison the D–A materials, MR-based basically showed smaller full width at half-maximum (fwhm) of spectra owing inherent structural vibration inhibition electronic transition characteristics. Herein, review summarizes current research progress on both MR blue, green red emission regions fwhm less than 70 nm concentrating molecular design strategies, photophysical properties corresponding device performance, proposes some possible future topic. This aims give physical insight structure–property relationship such offer guidance for further developing provide a structured database platform high-throughput or machine learning research.

Language: Английский

Citations

15
Multiple‐resonance thermally activated delayed emitters through multiple peripheral modulation to enable efficient blue OLEDs at high doping levels DOI Creative Commons

Yuyuan Wang,

Zhiwei Ma,

Junrong Pu

et al.

Aggregate, Journal Year: 2024, Volume and Issue: 5(5)

Published: May 13, 2024

Abstract Organic light‐emitting diodes (OLEDs) based on multiple resonance‐thermally activated delayed fluorescence (MR‐TADF) have the advantages of high exciton utilization and excellent color purity. However, large conjugated planarity general MR‐TADF emitters makes them easily aggregate in form π–π stacking, resulting aggregation‐caused quenching (ACQ) formation excimers, which reduce efficiency To address these issues, shielding units can be incorporated to prevent interchromophore interactions, whereas majority reported molecules are limited blue‐green light emissions. This work proposes a strategy incorporating steric hindrance groups at different sites B/N core suppress interactions between chromophore, contributing blue with photo‐luminance quantum yields (PLQYs ≥ 95%) narrow full width half maximum (FWHM), importantly, great suppression ACQ effect. Therefore, OLEDs achieve external efficiencies up 34.3% purity FWHM about 27 nm CIE around (0.12, 0.15), even doping concentration 20 wt%.

Language: Английский

Citations

13