Indolocarbazole‐Based Multiple‐Resonance Molecules: an Emerging Class of Full‐Color, Narrowband Emitters for Organic Light‐Emitting Diodes DOI
Xiang Wang, Lian Duan, Dongdong Zhang

и другие.

Chemistry - A European Journal, Год журнала: 2023, Номер 29(37)

Опубликована: Апрель 29, 2023

Narrowband emitters based on the multiple resonance (MR) effect have shown great promises for applications in high-definition displays. Though most reported MR adopt boron- and nitrogen-doped triangulene-like skeleton following design of DABNA series, materials with nitrogen-only indolocarbazole structures recently emerged demonstrated good color tunability from violet to deep red impressive electroluminescence performances terms both efficiency stability. Herein, we will summarize indolocarbazole-based recent reports, emphasis their molecular design, synthesis, photophysical properties as well some future research directions unlock full potential this fascinating class materials.

Язык: Английский

Management of Host–Guest Triplet Exciton Distribution for Stable, High‐Efficiency, Low Roll‐Off Solution‐Processed Blue Organic Light‐Emitting Diodes by Employing Triplet‐Energy‐Mediated Hosts DOI
Denghui Liu, Yan‐Mei He, Weidong Qiu

и другие.

Advanced Functional Materials, Год журнала: 2023, Номер 33(32)

Опубликована: Апрель 25, 2023

Abstract High‐quality hosts are indispensable for simultaneously realizing stable, high efficiency, and low roll‐off blue solution‐processed organic light‐emitting diodes (OLEDs). Herein, three solution processable bipolar with successively reduced triplet energies approaching the T 1 state of thermally activated delayed fluorescence (TADF) emitter developed evaluated high‐performance OLED devices. The smaller energy gap between host guest allows quenching long‐lived excitons to reduce exciton concentration inside device, thus suppresses singlet‐triplet triplet‐triplet annihilations. Triplet‐energy‐mediated enough better charge balance in device facilitate utilization efficiency uniform distribution among TADF guest. Benefited from these synergetic factors, a maximum external quantum (EQE max ) 20.8%, long operational lifetime (T 50 398.3 h @ 500 cd m −2 ), negligible 20.1% 1000 achieved bluish‐green OLEDs. Additionally introducing narrowband emission multiple‐resonance material as terminal accelerate dynamic improve utilization, higher EQE 23.1%, suppressed extended 456.3 sky‐blue sensitized OLEDs at same brightness.

Язык: Английский

Процитировано

24
Highly efficient through-space charge transfer TADF molecule employed in TADF- and TADF-sensitized organic light-emitting diodes DOI
Jiasen Zhang, Deli Li, Wei Li

и другие.

Science China Chemistry, Год журнала: 2024, Номер 67(4), С. 1270 - 1276

Опубликована: Янв. 8, 2024

Язык: Английский

Процитировано

11
Advances in display technology: augmented reality, virtual reality, quantum dot-based light-emitting diodes, and organic light-emitting diodes DOI Creative Commons
Jihoon Kang, Geun Woo Baek, Jun Yeob Lee

и другие.

Journal of Information Display, Год журнала: 2024, Номер 25(3), С. 219 - 234

Опубликована: Май 9, 2024

Virtual reality, augmented quantum dot light-emitting diodes, and organic diodes have progressed over the last two years. Key achievements in these displays are discussed terms of device performance.

Язык: Английский

Процитировано

11
Peripheral Substitution Engineering of MR‐TADF Emitters Embedded With B‒N Covalent Bond Towards Efficient BT.2020 Blue Electroluminescence DOI

Danrui Wan,

Jianping Zhou, Ying Yang

и другие.

Advanced Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 15, 2024

Compared with the classical boron/nitrogen (B/N) doped ones, multiple-resonance thermally activated delayed fluorescence (MR-TADF) emitters embedded B-N covalent bond behave a significantly blue-shifted narrowband TADF, and thus show greater potential in ultrapure blue organic light-emitting diodes (OLEDs). As proof of concept, herein peripheral substitution engineering is demonstrated based on such B‒N parent core. The simple approach found to ensure easy synthesis via one-pot lithium-free borylation-annulation, manipulate excited states through different electronic coupling between core substituent, introduce steric hindrance minimize unwanted spectral broadening. Impressively, OLEDs are realized give high external quantum efficiency 20.3% together Commission Internationale de l'Éclairage coordinates (0.152, 0.046). performance well competent those B/N MR-TADF emitters, clearly highlighting that framework novel promising paradigm towards efficient BT.2020 standard.

Язык: Английский

Процитировано

11
Promising interlayer sensitization strategy for the construction of high-performance blue hyperfluorescence OLEDs DOI Creative Commons
Jianhui Wang,

Peng Zou,

Letian Chen

и другие.

Light Science & Applications, Год журнала: 2024, Номер 13(1)

Опубликована: Июнь 13, 2024

Multi-resonance thermally activated delayed fluorescence (MR-TADF) materials are promising candidates for organic light-emitting diodes (OLEDs) with narrow electroluminescence (EL) spectra. Current researches focus on fabricating hyperfluorescence OLEDs to improve EL efficiencies of MR-TADF emitters by co-doping them TADF sensitizers in a single host layer. However, many cases, the polarity could be not suitable both blue and sensitizers, resulting broadened spectra high-polar hosts or decreased low-polar hosts. Herein, we wish report an efficient sensitization strategy constructing interlayer-sensitizing configuration, which separated into two closely aligned layers high low polarity, respectively. Based this strategy, realized verified employing various different emitters, furnishing outstanding external quantum up 38.8% These results validate feasibility universality interlayer provides effective alternative high-performance OLEDs.

Язык: Английский

Процитировано

10
Achieving Narrowband and Stable Pure Blue Organic Light‐Emitting Diodes by Employing Molecular Vibration Limited Strategies in the Extended π‐Conjugated Indolocarbazole Skeleton DOI Creative Commons
Zhiheng Wang,

Xuming Hu,

Zhi‐Ping Yan

и другие.

Advanced Science, Год журнала: 2025, Номер unknown

Опубликована: Янв. 13, 2025

Abstract B‐ and N‐heterocyclic fluorophores have reveal promising efficiency in blue organic light‐emitting diodes (OLEDs) with small full‐width‐at‐half‐maximum (FWHM). However, their structural determinants for spectral broadening operating stability are still needed to be investigated further. Herein, a novel multi‐N‐heterocycles Diindolo[3,2,1jk:3′,2′,1′jk]dicarbazole[1,2‐b:4,5‐b] (DIDCz) is proposed manipulate the emission color toward pure region by extending π‐conjugation of N‐π‐N bridge. By utilizing computed technique, interrelationships between indolocarbazole (ICz)‐cyclization sites defined. Molecular backbone modifications involving optimized 2,3,6,7‐ICz cyclization steric hindrance substituents conducive restricting swing peripheral bonds stretching resonances polycyclic aromatic hydrocarbon (PAH) frameworks, thereby contributing reduction shoulder peaks. Consequently, DIDCz‐based chromophore exhibited narrowband FWHM only 15 nm, achieving highly efficient (external quantum efficiencies 8.87% triplet–triplet fusion fluorescence 22.3% sensitized fluorescence) long‐term (95% initial luminance 1000 cd m −2 , T95 = 1545 h) electroluminescence performances, showing one most stable OLEDs among reported PAH chromophores. The current achievements offer new perspective manage precisely based on molecular vibration limiting technique.

Язык: Английский

Процитировано

1
Recent advancements in high efficiency deep blue organic light emitting diodes DOI

S. Sreejith,

J. Ajayan,

N V Uma Reddy

и другие.

Micro and Nanostructures, Год журнала: 2025, Номер unknown, С. 208101 - 208101

Опубликована: Фев. 1, 2025

Язык: Английский

Процитировано

1
Recent progress of blue fluorescent organic light-emitting diodes with narrow full width at half maximum DOI

Mingliang Xie,

Mizhen Sun,

Shanfeng Xue

и другие.

Dyes and Pigments, Год журнала: 2022, Номер 208, С. 110799 - 110799

Опубликована: Окт. 4, 2022

Язык: Английский

Процитировано

31
Wide-range color-tunable polycyclo-heteraborin multi-resonance emitters containing B–N covalent bonds DOI Creative Commons
Guoyun Meng,

Hengyi Dai,

Jianping Zhou

и другие.

Chemical Science, Год журнала: 2022, Номер 14(4), С. 979 - 986

Опубликована: Дек. 19, 2022

Boron- and nitrogen (BN)-fused polycyclic aromatic frameworks with amine-directed formation of B-N covalent bonds have the potential to form a new family facile-synthesis multi-resonance luminophores, which, however, still face imperative challenges in diversifying molecular design narrow emission bandwidth tune colors. Here, we demonstrate strategic implementation bond containing polycyclo-heteraborin emitters wide-range colors from deep-blue yellow-green (442-552 nm), small full-width at half-maxima only 19-28 nm high photoluminescence efficiencies, by stepwise modifying basic para B-π-B structures heteroatoms. The corresponding electroluminescent devices show superior maximum external quantum efficiencies an exceptional low-efficiency roll-off, retaining 21.0%, 23.6% 22.1% for sky-blue, green luminance 5000 cd m-2, respectively.

Язык: Английский

Процитировано

31
Blue Electrophosphorescence from Iridium(III) Phosphors Bearing Asymmetric Di‐N‐aryl 6‐(trifluoromethyl)‐2H‐imidazo[4,5‐b]pyridin‐2‐ylidene Chelates DOI
Jie Yan, Ziqi Feng, Yixin Wu

и другие.

Advanced Materials, Год журнала: 2023, Номер 36(17)

Опубликована: Июль 18, 2023

Abstract Efficient blue phosphors remain a formidable challenge for organic light‐emitting diodes (OLEDs). To circumvent this obstacle, series of Ir(III)‐based carbene complexes bearing asymmetric di‐ N ‐aryl 6‐(trifluoromethyl)‐ 2H ‐imidazo[4,5‐b]pyridin‐2‐ylidene chelates, namely, f ‐ct6a‒c , are synthesized, and their structures photophysical properties comprehensively investigated. Moreover, these emitters can undergo interconversion in refluxing 1,2,4‐trichlorobenzene, catalyzed by mixture sodium acetate (NaOAc) p ‐toluenesulfonic acid monohydrate (TsOH·H 2 O) without decomposition. All Ir(III) present good photoluminescence quantum yield ( Φ PL = 83–88%) with peak maximum (max.) at 443–452 nm narrowed full width half (FWHM 66–73 nm). Among all the fabricated OLED devices, ‐ct6b delivers max. external efficiency (EQE) 23.4% Commission Internationale de L'Eclairage CIE x y coordinates (0.14, 0.12), whereas hyper‐OLED device based on ‐ct6a 5H,9H,11H,15H‐[1,4] benzazaborino [2,3,4‐kl][1,4]benzazaborino[4′,3′,2′:4,5][1,4]benzazaborino[3,2‐b]phenazaborine‐7,13‐diamine, N7,N7,N13,N13,5,9,11,15‐octaphenyl (ν‐DABNA) exhibits EQE 26.2% (0.12, 0.13). Finally, corresponding tandem as dopant gives luminance over 10 000 cd m −2 42.1%, confirming candidacies making true‐blue OLEDs.

Язык: Английский

Процитировано

19