Thieno[3, 4‐b]thiadiazole Based Donor‐Acceptor Cyclic Oligomers: Ring Size‐Dependent Photophysical Properties and Efficient Near‐Infrared Electroluminescence Beyond 900 nm DOI

Wenxuan Zhang,

Wansheng Liu,

Zhichen Xu

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 6, 2024

Abstract Organic donor‐acceptor (D‐A) conjugated macrocycles, which are regarded as terminal‐less counterparts of linear π‐systems, have emerged a promising class material for organic optoelectronics. Nevertheless, circular symmetry generally makes the lowest electronic transition forbidden, is huge obstacle to developing bright near‐infrared macrocyclic dyes. Here, series cyclic D‐A oligomers (e.g., dimer ( [2]C 16 TT‐TPA ), trimer [3]C and tetramer [4]C )) synthesized in triphenylamine 4,6‐bisthienylthieno[3,4‐c]thiadiazole alternately coupled. The ring size‐dependent photophysical properties oligomers, such photoluminescence quantum yield radiative decay rate, revealed through both experiments theoretical calculations. Owing conformational flexibility dominant twisted conformation, shows increasing S 0 →S 1 thereby produces champion 6.35 % solution with emission beyond 900 nm, much higher than that acyclic oligomer (1.56%). Furthermore, ‐based light‐emitting diode achieves relatively high external efficiency 0.15% maximum radiance 2897 mW sr −1 m −2 . study not only provides insights into mechanism but also demonstrates potential D–A emitters.

Language: Английский

Tailored Fabrication of Full‐Color Ultrastable Room‐Temperature Phosphorescence Carbon Dots Composites with Unexpected Thermally Activated Delayed Fluorescence DOI
Lin Ai,

Wenjuan Xiang,

Jiping Xiao

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(27)

Published: April 23, 2024

Abstract The development of single‐system materials that exhibit both multicolor room‐temperature phosphorescence (RTP) and thermally activated delayed fluorescence (TADF) with tunable after glow colors channels is challenging. In this study, four metal‐free carbon dots (CDs) are developed through structural tailoring, panchromatic high‐brightness RTP achieved via strong chemical encapsulation in urea. maximum lifetime quantum yield reaches 2141 ms 56.55%, respectively. Moreover, CDs‐IV@urea, prepared coreshell interaction engineering, exhibits a dual afterglow red green TADF. degree conjugation functional groups precursors affects the binding interactions nitrogen cladding on CDs, which turn stabilizes triplet energy levels gap between S 1 T (Δ E ST ) to induce RTP. enhanced wrapping lowers Δ , promoting reverse intersystem crossing, leads This fully state, thus stabilizing material water, even extreme environments such as acids oxidants. These tested multicolor, time, temperature multiencryption well vivo bioimaging. Hence, these have promising practical applications information security biomedical diagnosis treatment.

Language: Английский

Citations

52
Acceptor Copolymerized Axially Chiral Conjugated Polymers with TADF Properties for Efficient Circularly Polarized Electroluminescence DOI Creative Commons
Wenlong Zhao,

Ke‐Ke Tan,

Wei‐Chen Guo

et al.

Advanced Science, Journal Year: 2024, Volume and Issue: 11(23)

Published: March 29, 2024

Abstract Chiral conjugated polymer has promoted the development of efficient circularly polarized electroluminescence (CPEL) device, nevertheless, it remains a challenge to develop chiral polymers with high performance. Herein, by acceptor copolymerization axially biphenyl emitting skeleton and benzophenone, pair namely R ‐ PAC S are synthesized. The target exhibit obvious thermally activated delayed fluorescence (TADF) activities photoluminescence quantum yields 81%. Moreover, display significant luminescence features, dissymmetry factor (| g lum |) nearly 3 × 10 −3 . By using as emitters, corresponding organic light‐emitting diodes (CP‐OLEDs) CPEL signals | EL 3.4 maximum external efficiency (EQE max ) 17.8%. Notably, considering both EQE comprehensively, device performance is best among all reported CP‐OLEDs emitters. This work provides facile approach constructing TADF discloses potential luminescent skeletons in architecting high‐performance CP‐OLEDs.

Language: Английский

Citations

9
Thermally activated delayed fluorescence enhanced by macrocyclization DOI Creative Commons
Shuo Li, Chenghao Zhu, Lijun Mao

et al.

Science China Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 3, 2025

Language: Английский

Citations

1
Development of Stable Water‐Soluble Supratomic Silver Clusters Utilizing A Polyoxoniobate‐Protected Strategy: Giant Core‐Shell‐Type Ag8@Nb162 Fluorescent Nanocluster DOI

Li‐Hao Hong,

Shengnan Yue, Xing Huang

et al.

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(29)

Published: May 7, 2024

Atomically precise low-nuclearity (n<10) silver nanoclusters (AgNCs) have garnered significant interest due to their size-dependent optical properties and diverse applications. However, synthesis has remained challenging, primarily inherent instability. The present study introduces a new feasible approach for clustering ions utilizing highly negative redox-inert polyoxoniobates (PONbs) as all-inorganic ligands. This strategy not only enables the creation of novel Ag-PONb composite but also facilitates stable AgNCs. Using this method, we successfully synthesized small octanuclear rhombic [Ag

Language: Английский

Citations

8
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

Citations

6
Thermally Activated Delayed Fluorescence Emitters Based on Rigid Lactam Acceptors: Simultaneously Achieving Desirable Emission Efficiency, Horizontal Orientation, and Reverse Intersystem Crossing DOI

Ze‐Ling Wu,

Yufu Sun,

Xin Lv

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(27)

Published: March 4, 2024

Abstract Thermally activated delayed fluorescence (TADF) materials that exhibit simultaneously high photoluminescence quantum yield (PLQY), rapid reverse intersystem crossing (RISC), and a horizontal transition dipole ratio are highly desirable for realizing high‐performance organic light‐emitting diodes (OLEDs). However, achieving this goal remains formidable challenge due to the stringent molecular design principles involved. Herein, three efficient TADF based on lactam‐type electron‐acceptors reported. The inherent rigidity planar structure of lactam units, along with ordered arrangement in solid states, contribute reduction nonradiative decay optimized emitters. Moreover, through precise control alignment lowest excited states by adjusting charge transfer strength, rate constants ( k RISC ) dramatically boosted. Consequently, two emitters outstanding merits ultra‐high PLQYs (98% 99%), ratios (91% 87%), fast ≈ 1.7 × 10 6 s −1 ). Thanks these merits, doped OLEDs achieve excellent performance. top‐performing device maximum external efficiency 34.3%, peak luminance 57376 cd m − 2 , small roll‐off.

Language: Английский

Citations

6
Chiral dual-core emitters based-on through-space coupling for high-performance OLEDs with little efficiency roll-off DOI
Lifen Chen,

Mingjia Deng,

Shao-Yun Yin

et al.

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 492, P. 152151 - 152151

Published: May 11, 2024

Language: Английский

Citations

4
High‐Efficiency Blue Polymer Light‐Emitting Diodes with Neat Thermally Activated Delayed Fluorescence Polymer Films DOI

Jinyu Lei,

Mingyue Zheng, Shuxin Li

et al.

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: May 2, 2025

Abstract Thermally activated delayed fluorescence (TADF) polymers have garnered considerable interest due to their promising application in solution‐processed large‐area displays. However, the realization of high‐performance blue TADF remains limited compared green and red counterparts. In this study, two series polymers, denoted as PSiCATx PMSiCATx, are introduced. Both characterized by presence tetraphenylsilyl group, where PMSiCATx contains an additional methyl group on tetraphenylsilane unit, which effectively limits conjugation length backbone. These methyl‐modified exhibit a photoluminescence quantum yield ≈100% neat film. Bi‐layer organic light‐emitting diodes with emissive layers utilizing hole injection layer modified perfluorinated ionomers demonstrate excellent electroluminescence performance. The device based polymer PMSiCAT20 achieves high external efficiency 19.5%, current 40.9 cd A −1 power 30.6 lm W , at peak emission wavelength 468 nm color coordinates Commission International de l’Eclairage (0.16, 0.25).

Language: Английский

Citations

0
Fusion of Four Aromatic Rings via an Atom-Mutual-Embedding Strategy to Form a Tetrahexacyclic System DOI
Fei‐Hu Cui, Le‐Han Gao,

Kaidong Ruan

et al.

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: April 14, 2025

Skeletal manipulation of aromatic compounds has emerged as a potent tool in synthetic chemistry, but simultaneous multiring remains largely unexplored due to the inherent complexities ring and site selectivity. Herein, we report an unprecedented skeletal that fuses four 5-membered rings, comprising two organic metal-containing systems, into novel metal-bridged 6/6/6/6-membered scaffold. The sequential fusion is accomplished through atom-mutual-embedding strategy; this strategy entails stepwise insertion nitrogen atoms separate metal-carbon bonds simultaneously integrates metal atom bridge across isoxazole moieties. presence central crucial for ensuring precise substrate alignment enhancing both specificity. resulting tetrahexacyclic products exhibit remarkable stability superior near-infrared (NIR) functional properties, surpassing those precursor compounds. This work not only establishes conceptual foundation designing versatile molecules amenable intricate editing also contributes rational performance-targeted molecular architectures.

Language: Английский

Citations

0
Thermally Activated Delayed Fluorescence Macrocycles for Organic Light‐Emitting Diodes DOI
Quanyou Feng,

Shoujia Zhu,

Bingyang Wang

et al.

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(14)

Published: Dec. 26, 2023

Abstract Macrocyclic compounds have garnered considerable attention in the realms of supramolecular chemistry and optoelectronic materials owing to their distinctive geometries, exceptional stability, potential chiral properties. As third‐generation organic light‐emitting diodes (OLEDs) emitters, thermally activated delayed fluorescence (TADF) present themselves as promising contenders due ability achieve complete exciton utilization through harnessing triplet excitons. The incorporation macrocyclic structures with TADF characteristics holds yield emitters endowed unique attributes, thereby synergistically enhancing performance longevity for diverse device applications, ultimately propelling commercialization. Within this comprehensive review, a thorough exploration molecular structures, synthesis methodologies, structure‐property relationships, applications reported systems OLEDs are delved. Additionally, prevailing challenges prospective research directions highlighted that demand realm materials. It is hoped review will provide researchers engaged lucid comprehension inspiration concerning intricacies these systems.

Language: Английский

Citations

7