Exploiting asymmetric anthracene-based multifunctional materials based on a “bulky peripheral modification” strategy for constructing simplified efficient deep-blue fluorescent OLEDs

Guo, Runda; Ye, Shaofeng; Wang, Yaxiong; Duan, Yalei; Di, Kaiyuan; Wang, Lei

doi:10.1039/d1tc02081a

Cited by 4 publications

(2 citation statements)

References 64 publications

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“…In 2021, Wang and co-workers developed two TTA emitters (58 and 59) containing anthracene grafted with bulky terphenyl/terpyridine and 1,5-diazacarbazole (15NCz) units in an asymmetric molecular structure. 101 The bulky periphery terphenyl/terpyridine and 15NCz groups can effectively improve the molecular space volume and reduce the intermolecular π−π stacking for promoting PLQY due to their large steric hindrance. As a result, these two molecules showed deep-blue emission (427−434 nm) with high PLQYs of 63% and 50%.…”

Section: And Oledsmentioning

confidence: 99%

Recent Advances in Triplet–Triplet Annihilation-Based Materials and Their Applications in Electroluminescence

Tao

Wong

2023

ACS Materials Lett.

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Efficient and stable blue organic light-emitting devices (OLEDs) represent one of the most important components in future solid-state lighting and full color displays. Although red and green OLEDs have been successfully commercialized, it remains challenging to realize blue OLEDs showing high efficiency and high stability simultaneously, restricting their commercialization. Triplet−triplet annihilation (TTA)-based materials have been emerging as a new category of electroluminescent or host materials with promising potential for highly efficient and stable blue devices due to their appealing photophysical properties (e.g., ability to generate emissive singlet excited states through TTA process, high photoluminescence quantum yield, ease of molecular design, etc.). Recently, research on TTA-based materials toward high-performance blue OLEDs has received an increasing attention. In this review, recent research advances on the molecular design strategies, photophysical properties of TTA-based materials (both blue emitters and host materials), mechanism of TTA-based electroluminescence, as well as their OLED applications are presented comprehensively. Moreover, potential perspectives with future research opportunities in this field are also described. We believe that the emerging TTA-based materials will bring more opportunities for developing a large family of novel photofunctional materials showing appealing and tunable photophysical properties, thus providing new opportunities for high-efficiency and stable blue electroluminescence in the future.

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Section: And Oledsmentioning

confidence: 99%

Recent Advances in Triplet–Triplet Annihilation-Based Materials and Their Applications in Electroluminescence

Tao

Wong

2023

ACS Materials Lett.

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“…Molecules with high steric hindrance still have a large number of applications in the field of organic luminescence, such as being used to construct thermally activated delayed fluorescence (TADF) emitters and reduce aggregation-induced emission quenching. , Carbazolyl dicyanobenzene (CDCB) is a kind of TADF material with low intrinsic mobility and enormous steric hindrance and has been widely exploited in the fields of organic light-emitting diode, organic photodetector, and organic solar cell . Such an enormous steric hindrance is mainly due to the rigid structure of carbazolyl groups being remarkably distorted from the dicyanobenzene ring with a large dihedral angle, and two cyano groups provide strong electron-accepting capability.…”

Section: Introductionmentioning

confidence: 99%

High On/Off Ratio Organic Resistive Switching Memory Based on Carbazolyl Dicyanobenzene and a Polymer Composite

Zhu

Sun

et al. 2022

J. Phys. Chem. C

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We reported a high on/off ratio organic resistive switching memory (ORSM) based on carbazolyl dicyanobenzene and the poly(3-hexylthiophene) (P3HT) composite. Two carbazolyl dicyanobenzene molecules, which were 2,4,5,6-tetrakis(carbazol-9-yl)-1,3-dicyanobenzene (4CzIPN) and 4,5-bis(carbazol-9-yl)-1,2-dicyanobenzene (2CzPN), were selected due to their low mobility and enormous steric hindrance. The ORSM exhibited non-volatile and bipolar memory properties with the on/off ratio of exceeding 105, retention time of more than 5 × 104 s, enduring ability of 150 times, “SET” voltage (V set) of −6 V, and “RESET” voltage (V reset) of 3.3 V. The large steric hindrance of 4CzIPN and 2CzPN led to a strong barrier between P3HT and 4CzIPN or 2CzPN, by which the intermolecular interaction was prohibited and the current leakage was sufficiently suppressed, leading to the enhanced on/off ratio. The mechanism of the switching was the filling and vacant process of the charge traps induced by 4CzIPN and 2CzPN, as well as the inherent traps in P3HT bulk. The negative or positive bias triggered the trapping and detrapping process, which led to the transforming of the conductive way of charges, resulting in the resistive switching effect. The study enlightens a new strategy to enhance the performance of the ORSM and facilitates their electronic application in the future.

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Synthesis and properties of an anthracene-based deep-blue emitter for organic light emitting diode

2023

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Exploiting asymmetric anthracene-based multifunctional materials based on a “bulky peripheral modification” strategy for constructing simplified efficient deep-blue fluorescent OLEDs

Abstract: Herein, an asymmetric bulky periphery enveloping strategy was proposed to delicate manipulate molecules for the construction of novel multifunctional organic electronic materials. 9,10-diphenylanthracene (DPA) was selected as the framework of...

Cited by 4 publications

References 64 publications

Recent Advances in Triplet–Triplet Annihilation-Based Materials and Their Applications in Electroluminescence

Recent Advances in Triplet–Triplet Annihilation-Based Materials and Their Applications in Electroluminescence

High On/Off Ratio Organic Resistive Switching Memory Based on Carbazolyl Dicyanobenzene and a Polymer Composite

Synthesis and properties of an anthracene-based deep-blue emitter for organic light emitting diode

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