Asymmetric donor–acceptor–host red thermally activated delayed fluorescent emitter for high-efficiency organic light emitting diodes

Li, Hao-ze; Xie, Feng‐Ming; Wu, Peng; Zhang, Kai; Zhao, Xin; Li, Yanqing; Tang, Jianxin

doi:10.1039/d3tc01632c

Cited by 4 publications

(2 citation statements)

References 51 publications

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“…According to Sato and Kanai, one potential cause of the voltage increase that occurs as a device is aging is the oxidation of the cathode/organic interface [207]. One strategy that has been used to address this problem is the application of calcium as a "sacrificial anode" on top of a Mg:Al cathode, resulting in the creation of a "getter" that efficiently scavenges oxygen and water, adding another layer of protection [234]. It is important to note that when the calcium layer was not in close contact with the underlying cathode, its ability to prevent the creation of dark spots was found to be less effective.…”

Section: Voltage Effectmentioning

confidence: 99%

Unraveling Degradation Processes and Strategies for Enhancing Reliability in Organic Light-Emitting Diodes

Naqvi,

Baig,

Farid

et al. 2023

Nanomaterials

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Organic light-emitting diodes (OLEDs) have emerged as a promising technology for various applications owing to their advantages, including low-cost fabrication, flexibility, and compatibility. However, a limited lifetime hinders the practical application of OLEDs in electronic devices. OLEDs are prone to degradation effects during operation, resulting in a decrease in device lifetime and performance. This review article aims to provide an exciting overview of OLED degradation effects, highlighting the various degradation mechanisms. Subsequently, an in-depth exploration of OLEDs degradation mechanisms and failure modes is presented. Internal and external processes of degradation, as well as the reactions and impacts of some compounds on OLED performance, are then elucidated. To overcome degradation challenges, the review emphasizes the importance of utilizing state-of-the-art analytical techniques and the role of these techniques in enhancing the performance and reliability of OLEDs. Furthermore, the review addresses the critical challenges of lifetime and device stability, which are crucial for the commercialization of OLEDs. This study also explores strategies to improve OLEDs’ lifetime and stability, such as using barrier layers and encapsulation techniques. Overall, this article aims to contribute to the advancement of OLED technology and its successful integration into diverse electronic applications.

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Section: Voltage Effectmentioning

confidence: 99%

Unraveling Degradation Processes and Strategies for Enhancing Reliability in Organic Light-Emitting Diodes

Naqvi,

Baig,

Farid

et al. 2023

Nanomaterials

View full text Add to dashboard Cite

show abstract

“…9 Particularly, various blue luminescent materials that are capable of efficiently utilizing electrically generated triplet excitons have been developed to greatly improve the maximum external quantum efficiency (EQE max ) in blue OLEDs. 10–12 A promising method of enhancing the exciton utilization efficiency is the rational combination of the donor (D) and acceptor (A) to form the CT excitons, which favors the electron flip. 13,14 After years of endeavors, thermally-activated delayed fluorescence (TADF) and hot exciton materials, both of which possess CT characteristics and can effectively use the triplet excitons, have been successfully developed.…”

Section: Introductionmentioning

confidence: 99%

Achieving phthalide-based fluorescent materials with hybridized local and charge-transfer characteristics for efficient deep blue OLEDs

Feng,

Liu,

Cheng

et al. 2024

J. Mater. Chem. C

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Creating Efficient Red Thermally Activated Delayed Fluorescence Materials with Cyano‐Substituted 11,12‐Diphenyldipyrido[3,2‐a:2′,3′‐c]phenazine Acceptors

Bai,

Wang,

Zou

et al. 2024

Chemistry A European J

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Red luminescent materials are essential components for full color display and white lightening based on organic light‐emitting diode (OLED) technology, but the extension of emission color towards red or deep red region generally leads to decreased photoluminescence and electroluminescence efficiencies. Herein, we wish to report two new luminescent molecules (2CNDPBPPr‐TPA and 4CNDPBPPr‐TPA) consisting of cyano‐substituted 11,12‐diphenyldipyrido[3,2‐a:2',3'‐c]phenazine acceptors and triphenylamine donors. As the increase of cyano substituents, the emission wavelength is greatly red‐shifted and the reverse intersystem crossing process is promoted, resulting in strong red delayed fluorescence. Meanwhile, due to the formation of intramolecular hydrogen bonds, the molecular structures become rigidified and planarized, which brings about large horizontal dipole ratios. As a result, 2CNDPBPPr‐TPA and 4CNDPBPPr‐TPA can perform as emitters efficiently in OLEDs, furnishing excellent external quantum efficiencies of 28.8% at 616 nm and 20.4% at 648 nm, which are significantly improved in comparison with that of the control molecule without cyano substituents. The findings in this work demonstrate that the introduction of cyano substituents to the acceptors of delayed fluorescence molecules could be a facile and effective approach to explore high‐efficiency red or deep red delayed fluorescence materials.

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Asymmetric donor–acceptor–host red thermally activated delayed fluorescent emitter for high-efficiency organic light emitting diodes

Abstract: Efficient red emitters are crucial to the widespread use of organic light-emitting diodes (OLEDs) in future display and lighting technologies. However, the highly planar configurations of red TADF emitters lead...

Cited by 4 publications

References 51 publications

Unraveling Degradation Processes and Strategies for Enhancing Reliability in Organic Light-Emitting Diodes

Unraveling Degradation Processes and Strategies for Enhancing Reliability in Organic Light-Emitting Diodes

Achieving phthalide-based fluorescent materials with hybridized local and charge-transfer characteristics for efficient deep blue OLEDs

Creating Efficient Red Thermally Activated Delayed Fluorescence Materials with Cyano‐Substituted 11,12‐Diphenyldipyrido[3,2‐a:2′,3′‐c]phenazine Acceptors

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