Two novel bipolar compounds based-on 1, 2, 4-triazol derivatives for non-doped deep-blue and green phosphorescent OLED applications

Wang, Kexiang; Sun, Peng; Xu, Huixia; Li, Jie; Wang, Fang; Miao, Yanqin; Yang, Tingting; Wang, Hua; Xu, Bingshe; Wong, Wai Yeung

doi:10.1016/j.dyepig.2017.03.069

Cited by 21 publications

(10 citation statements)

References 38 publications

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“…2a, the absorption of M1 and M2 exhibits bands in the range from 250 to 430 nm (247, 298, 387 nm for M1; 254, 303, 378 nm for M2), attributed to the p-p* electronic transition of the quinoxaline and carbazole unit. 33,34,[40][41][42] M1 and M2 show almost the same absorption spectra in spite of the larger p-electron conjugation of compound M2, implying that the introduction of the phenyl spacer almost has little effect on the absorption properties of these donor-acceptor systems.…”

Section: Photophysical Propertiesmentioning

confidence: 99%

“…However, the LUMO energy of compound M1 (À3.09 eV) were higher than that of M2 (À3.21 eV), implying that the phenyl spacer have evident inuence on the LUMO of these donor-acceptor systems. [40][41][42] Red phosphorescent OLEDs…”

Section: Electrochemical Propertiesmentioning

confidence: 99%

“…Many bipolar host materials have been explored in highly efficient red phosphorescent OLEDs, especially in the design of acceptor moieties. [40][41][42] Recently, diphenylquinoxaline derivatives showing excellent electron-transportation property also have been selected as the novel acceptor moiety to realize the bipolar host materials. 33,34 For instance, Cheng et al designed an excellent bipolar host material which is composed of two 6Hindolo [2,3-b]quinoxaline unit bridged by the tetraphenylsilane core realizing high-efficiency red phosphorescent OLEDs.…”

Section: Introductionmentioning

confidence: 99%

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Rational design of quinoxaline-based bipolar host materials for highly efficient red phosphorescent organic light-emitting diodes

Feng

Gao

et al. 2019

RSC Adv.

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Section: Photophysical Propertiesmentioning

confidence: 99%

Section: Electrochemical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rational design of quinoxaline-based bipolar host materials for highly efficient red phosphorescent organic light-emitting diodes

Feng

Gao

et al. 2019

RSC Adv.

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“…And blue phosphorescent OLEDs hosted by these materials achieve maximum CE of 11.0 cd/A. Using triphenylamine and 9,9‐diphenyl‐9 H ‐fluorene as donor, another two triazole‐based bipolar blue light‐emitting materials (11 and 12) is realized (Figure b) . The compound 11‐based non‐doped OLEDs shows deep‐blue emission at 436 nm associated with the CIE coordinate of (0.15, 0.05) (Figure d).…”

Section: Organic Light‐emitting Materialsmentioning

confidence: 99%

Section: Organic Light‐emitting Materialsmentioning

confidence: 99%

High‐Performance Organic Electroluminescence: Design from Organic Light‐Emitting Materials to Devices

Tao

Miao

Wang

et al. 2018

The Chemical Record

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Organic electroluminescence is considered as the most competitive alternative for the future solid-state displays and lighting techniques owing to many advantages such as selfluminescence, high efficiency, high contrast, high color rendering index, ultra-thin thickness, transparency, flat and flexibility, etc. The development of high-performance organic electroluminescence has become the continuing focus of research. In this personal account, a brief overview of representative achievements in our study on the design of highly efficient novel organic light-emitting materials (including fluorescent materials, phosphorescent iridium(III) complexes and conjugated polymers bearing phosphorescent iridium(III) complex) and highperformance device structures together with working principles are given. At last, we will give some perspectives on this fascinating field, and also try to provide some potential directions of research on the basis of the current stage of organic electroluminescence. Wiley Online Library 1537 Scheme 5. The chemical structures of cationic iridium(III) complexes based on various N N ligands (18-23).Figure 7. UV-vis absorption (a) and PL (b) of 18-23 in CH 2 Cl 2 . [30] Figure 35. (a) The device structure and proposed working mechanism for WOLED with sandwiched blue EML; (b) The normalized EL spectra of WOLED at the voltage of 5-7 V, and corresponding luminance, CIE, CCT, and CRI are also given. [65a]

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Diarylfluorene‐Based Organic Semiconductor Materials toward Optoelectronic Applications

Han

Bai

Lin

et al. 2021

Adv Funct Materials

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reorganizing these two types of π orbitals, thus endowing the active films with significantly different optoelectronic property. In order to design high-performance and stable conjugated molecules, some basic principles should be followed, such as electronic structure, conformation and topology, steric hindrance, as well as supramolecular interaction, which also called four fundamental nodes proposed by Huang group. [8] Particularly, steric hindrance design is an effective strategy to enhance device performance and stability via adjusting the spatial arrangement of active molecular bricks, the morphology of films, and the fine optoelectronic properties. [9,10] The sterically hindered groups are capable to rotate the dihedral angles of the adjacent monomer units, which can inhibit interchain interactions and further reduce aggregation. In addition, the rigid bulks are favorable for improving the morphological and emission spectral stability of light-emitting conjugated polymers in solid state. Besides, beyond the intrinsic electronic structures, molecular conformation and topology is a crucial for precisely tuning the physical process, controlling film morphology, device performance, and stability.Similar to the industrial manufacturing, modular production of conjugated materials enable them to present a precise electron-structure tunability, controllable structural modification, and low-cost large-scale preparation, similar to Lego building block. In the last decades, amounts of building blocks, such as fluorene, carbazole (Cz), thiophene (Th), and benzothiadiazole, have been employed to design various conjugated molecules for specific applications. [11][12][13][14][15] Among these synthons, fluorene-based bulks have been widely reported to construct high performance organic semiconductors for efficient optoelectronic devices, owing to their easy chemical modification, stable thermodynamic property, high fluorescence quantum yield, and appropriate charge transport capability. [16][17][18][19] Nevertheless, the conventional fluorene units suffer from poor color purity and luminous stability due to significantly interchain aggregation and photo-/electro-oxidation of the alkyl pendant groups at C9 position, which restricted their actual development. [20] The appearance of diarylfluorene structure provides a broader space for the design and preparation of blue emitters with higher purity and efficiency. In 1905, the simplest diarylfluorene (9,9′-diphenylfluorene) was synthesized by Ullmann and Wurstemberger for the first time. [21] As a most promise and popular alternative, diarylfluorene is a non-planar architecture

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Two novel bipolar compounds based-on 1, 2, 4-triazol derivatives for non-doped deep-blue and green phosphorescent OLED applications

Cited by 21 publications

References 38 publications

Rational design of quinoxaline-based bipolar host materials for highly efficient red phosphorescent organic light-emitting diodes

Rational design of quinoxaline-based bipolar host materials for highly efficient red phosphorescent organic light-emitting diodes

High‐Performance Organic Electroluminescence: Design from Organic Light‐Emitting Materials to Devices

Diarylfluorene‐Based Organic Semiconductor Materials toward Optoelectronic Applications

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