A novel D–π–A blue fluorophore based on [1,2,4]triazolo[1,5-<i>a</i>]pyridine as an electron acceptor and its application in organic light-emitting diodes

Cao, Chen; Chen, Wen‐Cheng; Tian, Shuang; Chen, Jia‐Xiong; Wang, Zhongyi; Zheng, Xu‐Hui; Ding, Chong-Wei; Li, Jinghong; Zhu, Jie-Ji; Zhu, Ze‐Lin; Tong, Qing‐Xiao; Lee, Chun‐Sing

doi:10.1039/c8qm00678d

Cited by 41 publications

(22 citation statements)

References 46 publications

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“…To attain a facile RISC, Δ E ST of TADF emitters should be minimized by adopting a donor–acceptor molecular design, where the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) are decoupled. − However, a small overlap between frontier molecular orbitals (FMOs) sometimes leads to a slow radiative decay and possibly a lower quantum yield, as the Franck-Condon principle suggested. , The other factor is that orange-red emitters have much intrinsic probability of nonradiative internal conversion. As a result, they may suffer from lower PLQYs. , Few impressive studies were published in recent years; − however, the development of such efficient orange-red TADF emitters still lags far behind the green and blue ones’ and requires further studies.…”

Section: Introductionmentioning

confidence: 99%

Diboron-Based Delayed Fluorescent Emitters with Orange-to-Red Emission and Superior Organic Light-Emitting Diode Efficiency

Hsieh

Jayakumar

et al. 2020

ACS Appl. Mater. Interfaces

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For the application of organic light-emitting diodes (OLEDs) in lighting and panels, the basic requirement is to include a full spectrum color range. Compared with the development of blue and green luminophores in thermally activated delayed fluorescence (TADF) technology, the progress of orange-to-red materials is slow and needs further investigation. In this study, three diboron compound-based materials, dPhADBA, dmAcDBA, and SpAcDBA, were designed and synthesized by nucleophilic arylation of three amine donors on 9,10-diboraanthracene (DBA) in a two-step reaction. With increasing electron-donating ability, they show orange-to-red emission with TADF characteristics. The electroluminescence of these diboron compounds exhibits emissions λ max at 613, 583, and 567 nm for dPhADBA, dmAcDBA, and SpAcDBA, respectively. It is noteworthy that the rod-like D-A-D structures can achieve high horizontal ratios (84−86%) and outstanding device performance for orange-to-red TADF OLEDs: the highest external quantum efficiencies for dPhADBA, dmAcDBA, and SpAcDBA are 11.1 ± 0.5, 24.9 ± 0.5, and 30.0 ± 0.8%, respectively. Therefore, these diboron-based molecules offer a promising avenue for the design of orange-to-red TADF emitters and the development of highly efficient orange-to-red OLEDs.

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Section: Introductionmentioning

confidence: 99%

Diboron-Based Delayed Fluorescent Emitters with Orange-to-Red Emission and Superior Organic Light-Emitting Diode Efficiency

Hsieh

Jayakumar

et al. 2020

ACS Appl. Mater. Interfaces

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“…Organic light-emitting devices (OLEDs) are widely regarded as next-generation technology for lighting devices [1,2] and displays [3,4], and as cutting-edge technology in bio-medicines [5,6], in security and communications [7,8], and in biological and environmental applications [9,10,11,12].…”

Section: Introductionmentioning

confidence: 99%

Novel Dicyano-Phenylenevinylene Fluorophores for Low-Doped Layers: A Highly Emissive Material for Red OLEDs

Diana¹,

Panunzi²,

Marrafino

et al. 2019

Polymers

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Two efficient deep red (DR)-emitting organic dicyano-phenylenevinylene derivatives with terminal withdrawing or donor groups were synthesized. The spectroscopic properties of the neat solids and the low-doped layers in polystyrene or polyvinylcarbazole host matrixes were analyzed, and the luminescence performance was explained using density functional theory (DFT) analysis. A noteworthy 89% fluorescence quantum yield was observed for the brightest red-emissive polyvinylcarbazole (PVK) blend. This result pushed us to successfully produce an emissive red organic light-emitting device (OLED) as a preliminary feasibility test.

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“…In this work, we proposed a feasible host material 1‐phenyl‐2‐(5′‐phenyl‐[1,1′:3′,1″‐terphenyl]‐4‐yl)‐1 H ‐phenanthro[9,10‐ d ]imidazole ( PHT‐PPI ) to realize high‐performance phosphorescent devices by appropriate molecular designing and device engineering. Comprising propeller‐shaped substituent moiety 5′‐phenyl‐1,1′:3′,1″‐terphenyl and phenanthro[9,10‐d]imidazole (PI) [ 18 ] ( Figure a), PHT‐PPI exhibited bipolar charge transporting character, high photoluminescent quantum yield (Φ f ), and appropriate HOMO and LUMO energy levels. Moreover, the T 1 energy level ( E T1 ) of PHT‐PPI was as high as ≈2.44 eV, indicating the features of being an ideal host material for energy transfer.…”

Section: Introductionmentioning

confidence: 99%

Effective Energy Transfer for Green, Orange, and Red Phosphorescent Organic Light‐Emitting Diodes Based on a Bipolar Deep‐Blue Emitter with Low Efficiency Roll‐Off at High Brightness

Yang

Zhu

Tang

et al. 2021

Advanced Photonics Research

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Of paramount significance in phosphorescent organic light‐emitting diodes (PHOLEDs) are the facts that Förster resonance energy transfer (FRET) must be sufficient and back energy transfer should be prohibited. Herein, the FRET efficiencies for high‐performance PHOLEDs based on a simple bipolar luminogen 1‐phenyl‐2‐(5′‐phenyl‐[1,1′:3′,1″‐terphenyl]‐4‐yl)‐1H‐phenanthro[9,10‐d]imidazole (PHT‐PPI) with high triplet energy of 2.44 eV are systematically investigated. As a result, with PO‐01 as dopant, the high‐performance orange PHOLED is achieved with maximum external quantum efficiency (EQEmax) of 26.14% and ultrahigh brightness of 152 000 cd m−2, which are the highest reported efficiencies for orange OLEDs with such high brightness. In addition, the green and red PHOLEDs are also fabricated with EQEmax of 15.38% and 16.12%, respectively. Furthermore, the nondoped device based on PHT‐PPI as a deep‐blue emitter is also obtained with an EQEmax of 5.12% and the Commission Internationale de L’Eclairage (CIE) index of (0.15, 0.08). More importantly, the blue, green, orange, and red devices exhibit low efficiency roll‐off, particularly, of which the orange PHOLED is extremely small (<9%) even at the brightness of 10 000 cd m−2.

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A novel D–π–A blue fluorophore based on [1,2,4]triazolo[1,5-a]pyridine as an electron acceptor and its application in organic light-emitting diodes

Abstract: A novel luminophore based on [1,2,4]triazolo[1,5-a]pyridine has been utilized as an emitter and host for high-efficiency deep-blue fluorescence and orange phosphorescence OLEDs, respectively.

Cited by 41 publications

References 46 publications

Diboron-Based Delayed Fluorescent Emitters with Orange-to-Red Emission and Superior Organic Light-Emitting Diode Efficiency

Diboron-Based Delayed Fluorescent Emitters with Orange-to-Red Emission and Superior Organic Light-Emitting Diode Efficiency

Novel Dicyano-Phenylenevinylene Fluorophores for Low-Doped Layers: A Highly Emissive Material for Red OLEDs

Effective Energy Transfer for Green, Orange, and Red Phosphorescent Organic Light‐Emitting Diodes Based on a Bipolar Deep‐Blue Emitter with Low Efficiency Roll‐Off at High Brightness

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