Increasing the operating lifetime of green phosphorescent organic light emitting diodes by reducing charge accumulation at the interface

Wu, Yibing; Luo, Jianhui; Lin, Chengwei; Zhu, Tengfei; Qiao, Xianfeng; Yang, Dezhi; Dai, Yanfeng; Sun, Qian; Chen, Jianshan; Ma, Dongge

doi:10.1039/d2cp05797b

Cited by 3 publications

(2 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Researchers are developing new encapsulation techniques to shield OLEDs from elements that can cause damage [152]. One most promising technique is using flexible and transparent barrier materials that can protect OLEDs from oxygen and moisture while retaining excellent optical transparency [153]. The optimization of carrier accumulation at the hole-transporter/emission layer interface results in impressive characteristics, including a narrow emission spectrum, high color purity, and an extended operational lifetime [154].…”

Section: Accumulation Of Excessive Charge At Interfacesmentioning

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

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.

show abstract

Section: Accumulation Of Excessive Charge At Interfacesmentioning

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

“…[ 43–57 ] This mechanistic understanding offered valuable insights for enhancing the operational longevity of OLEDs. [ 20,52,58–78 ]…”

Section: Introductionmentioning

confidence: 99%

Polaronic Stabilities of Exciton Sensitizers Govern Operational Lifetime of Thermally Activated Delayed Fluorescence Assisted Fluorescence Organic Light‐Emitting Devices

Moon,

Jang,

Shin

et al. 2024

Advanced Optical Materials

View full text Add to dashboard Cite

Thermally activated delayed fluorescence (TADF) assisted fluorescence organic light‐emitting devices (TAF‐OLEDs), also known as hyperfluorescence OLEDs, sometimes have limited operational lifetimes, making them unsuitable for industrial applications. Although, this limitation is believed to originate from the irreversible degradation of constituent materials, the chemical processes underlying this degradation remain elusive. This study enables to better understand the chemical origins of the degradation processes by identifying key degradation intermediates in emission layers comprising 2,8‐di‐tert‐butyl‐5,11‐bis(4‐tert‐butylphenyl)‐6,12‐diphenyltetracene (TBRb) as the fluorescent emitter and 1,4‐azaborin‐based molecules exhibiting multi‐resonance (MR) TADF behaviors, 5,9‐diphenyl‐5,9‐diaza‐13b‐boranaphtho[3,2,1‐de]anthracene (DABNA‐1) and 9‐([1,1′‐biphenyl]‐3‐yl)‐N,N,5,11‐tetraphenyl‐5,9‐dihydro‐5,9‐diaza‐13b‐boranaphtho[3,2,1‐de]anthracen‐3‐amine (DABNA‐2), as exciton sensitizers. Despite the sensitizers facilitating energy transfer to TBRb, they also reduce the device's longevity. While the singlet and triplet excitons of TBRb, as well as excitons of the sensitizers, prove to be relatively stable, the radical ions of the sensitizers prove to be the key limit to device longevity. Comparisons with donor–acceptor‐type TADF exciton sensitizers, 2,4,5,6‐tetrakis(9H‐carbazol‐9‐yl)benzene‐1,3‐dicarbonitrile (4CzIPN), 10,10′‐(sulfonyldi‐4,1‐phenylene)bis[9,10‐dihydro‐9,9‐dimethylacridine] (DMAC‐DPS), and 10‐[4‐(4,6‐diphenyl‐1,3,5‐triazin‐2‐yl)phenyl]‐9,10‐dihydro‐9,9‐dimethylacridine (DMAC‐TRZ), corroborate the findings, pointing to radical ions as primary degradation intermediates. This knowledge is essential for enhancing the durability of TAF‐OLEDs in future designs.

show abstract

Degradation mechanisms and lifetime extending strategy of phosphorescent and thermally activated delayed-fluorescence organic light-emitting diodes

Jiang

Lee

2023

Materials Today

View full text Add to dashboard Cite

Increasing the operating lifetime of green phosphorescent organic light emitting diodes by reducing charge accumulation at the interface

Abstract: The stability and degradation mechanism of phosphorescent organic light emitting diodes (OLEDs) have been an unsettled problem in the past decades. Here, we found that the electron accumulation at the...

Cited by 3 publications

References 39 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

Polaronic Stabilities of Exciton Sensitizers Govern Operational Lifetime of Thermally Activated Delayed Fluorescence Assisted Fluorescence Organic Light‐Emitting Devices

Degradation mechanisms and lifetime extending strategy of phosphorescent and thermally activated delayed-fluorescence organic light-emitting diodes

Contact Info

Product

Resources

About