Multiple Donor Modification of Boron‐Based Emitters to Produce Aggregation‐Induced Emission and Thermally Activated Delayed Fluorescence for Blue OLEDs

Advanced Optical Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 17, 2025

Abstract Two novel multi‐donor emitters, bearing 1,1,4,4,12,12,15,15‐octamethyl‐1,2,3,4,12,13,14,15‐octahydro‐6,10‐dioxa‐16 b ‐boraanthra[3,2,1‐ de ]tetracene (CyDOBNA) are presented. In 3TPA‐CyDOBNA, three electron‐rich triphenylamine (TPA) units positioned on the central benzene ring of CyDOBNA to maximize distortion from an acceptor plane. This modification reduces singlet–triplet energy gap (Δ E ST ) by 0.16 eV, highlighting its thermally activated delayed fluorescence (TADF) characteristics. However, congested TPA donors bottom side found facilitate non‐radiative decay in a triplet state, indicating that Δ alone is insufficient for optimal device performance. Further refinement led creation Ph2TPA‐CyDOBNA, where two and one phenyl group minimize pathways while preserving TADF behavior. results reverse intersystem crossing rate 2.30 × 10 5 s −1 0.15 eV. Photophysical investigations reveal these emitters exhibit not only but also aggregation‐induced emission properties, maintaining high photoluminescence quantum yield (PLQY) even solid state. doped OLED device, external efficiency (EQE) 18.9% achieved 3TPA‐CyDOBNA. Compared with EQE Ph2TPA‐CyDOBNA improves 21.1%, primarily because suppression excessive flexibility donors.

Язык: Английский

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A Novel Chrysene‐Anthracene Host Material for Enhanced Efficiency and Lifetime in Blue Fluorescent OLEDs

Advanced Optical Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 28, 2025

Abstract In this study, PAP‐1‐Ch is presented, a novel anthracene‐based host material, designed specifically for high‐efficiency and stable blue fluorescent organic light‐emitting diodes (OLEDs). The unique molecular architecture of integrates chrysene substituent anthracene, achieving an optimal balance between steric hindrance linearity. This plays critical role in minimizing π–π stacking, which effectively prevents fluorescence quenching while promoting favorable horizontal orientation up to 91.5% enhancing the photoluminescence quantum yield (PLQY) 93.1%, thereby significantly improving out‐coupling efficiency. Furthermore, finely tuned structure results superior charge carrier mobility more balanced electron/hole injection current. Devices fabricated with as material demonstrated remarkable performance metrics, color purity Commission Internationale de l'Eclairage (CIE) coordinates (0.136, 0.130), luminance efficiency 13.2 cd A −1 , maximum external ( EQE ) 12.6%, operational lifetime (LT 95 over 12 000 h at 100 m − 2 . These represent substantial advancement development high‐efficiency, OLEDs, paving way their application next generation high‐end displays.

Язык: Английский

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The efficacy of miR-141-3p to facilitate the healing of wounds and prevent scarring in mice by blocking the JNK/ERK pathway via HDAC6 silencing

Molecular Biology Reports, Год журнала: 2025, Номер 52(1)

Опубликована: Фев. 15, 2025

Язык: Английский

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High-Efficiency Deep-Blue Solution-Processed OLED Devices Enabled by New Dopant Materials

Materials, Год журнала: 2025, Номер 18(10), С. 2213 - 2213

Опубликована: Май 10, 2025

Two blue fluorescent dopants were designed and successfully synthesized, 5-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho [3,2,1-de]anthracen-7-yl)-5H-benzo[b]carbazole (TDBA-Bz) 9-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracen-7-yl)-9H-carbazole (TDBA-Cz). Both in solution the film state, two emitters demonstrated deep-blue luminescence characteristics. In solution-processed organic light-emitting diodes (OLEDs), TDBA-Bz TDBA-Cz used as dopant materials showed electroluminescence peaks at 436 nm 413 nm, respectively. The corresponding CIE color coordinates determined to be (0.181, 0.114) for (0.167, 0.086) TDBA-Cz. device using a exhibited current efficiency (CE) of 7.25 cd/A an external quantum (EQE) 6.45%, demonstrating higher efficiencies compared with TDBA-Bz. particular, luminance 2000 cd/m2, maintained EQE 4.81%, only slight decrease from its maximum EQE.

Язык: Английский

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D-A-D-type bipolar hosts incorporating N-phenylcarbazole and quinoline at various connection sites with high electron mobility for red electrophosphorescence

Synthetic Metals, Год журнала: 2024, Номер 308, С. 117712 - 117712

Опубликована: Авг. 6, 2024

Язык: Английский

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New Blue Emitters Based on Anthracene Through Charge Transfer Control

Synthetic Metals, Год журнала: 2024, Номер unknown, С. 117762 - 117762

Опубликована: Сен. 1, 2024

Язык: Английский

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