Abnormal current dependence of high-level reverse intersystem crossing induced by Dexter energy transfer from hole-transporting layer

Tang, Xiantong; Pan, Ruiheng; Xu, Jing; Jia, Weiyao; Qu, Fenlan; Zhao, Xi; Xiong, Zuhong

doi:10.1039/d0tc02322a

Cited by 1 publication

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“…However, the first two peaks should separately come from the emissions of the sole m-MTDATA exciton and the m-MTDATA/BCP interface exciplex. This is because the emission peaks of single-layer m-MTDATA and BCP films are approximately 420 31 and 390 nm, 32 whereas the 506 nm peak is significantly different and red-shifted compared to these two emission peaks. Notably, the 0−0 peaks of device A1 dominate at all temperatures, and the 0−0 and 0−1 peaks at any temperature are almost unchanged.…”

Section: Effects Of Different Host Molecular Structures On the Aggreg...mentioning

confidence: 98%

Realization of H-Type Aggregation in Rubrene-Doped OLEDs and Its Induced Enhancement of Delayed Fluorescence

Tang

Zhao

et al. 2022

J. Phys. Chem. C

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The molecular aggregation effect on the photophysical properties of many organic semiconductors has been well studied, but this behavior of rubrene molecules is still vague in rubrene-doped organic light-emitting diodes. Surprisingly, via recording temperature-dependent electroluminescence and photoluminescence spectra, an intriguing H-type aggregation of rubrene molecules is realized from rubrene-doped devices and films only when 4,4′,4″-tris(N-3-methylphenyl-N-phenyl-amino)triphenylamine (m-MTDATA) or 4,4′,4″-tris(N-(2-naphthyl)-N-phenyl-amino)triphenylamine (2TNATA) is selected as the host; otherwise, the J-type aggregation of rubrene molecules is solely observed. We propose that this H-type aggregation is caused by the increased steric hindrance between adjacent rubrene molecules because the unique molecular structures of 12 freely rotating chemical bonds in m-MTDATA or 2TNATA are suppressed in rubrene-doped solid-state films. More importantly, we find that the H-type aggregation of rubrene molecules induces a nearly 3-fold increase in the fluorescence of rubrene-doped devices at 20 K. The increased fluorescence can be mainly attributed to the intensified triplet–triplet annihilation (TTA) process because the parallel alignment of transition dipole moments in H-aggregation can facilitate the TTA process via enlarging the TTA reaction cross-section. Thus, our findings deepen the understanding of molecular interactions in aggregation systems and pave the way for achieving highly efficient devices operated especially in a low-temperature environment such as outer space.

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Section: Effects Of Different Host Molecular Structures On the Aggreg...mentioning

confidence: 98%

Realization of H-Type Aggregation in Rubrene-Doped OLEDs and Its Induced Enhancement of Delayed Fluorescence

Tang

Zhao

et al. 2022

J. Phys. Chem. C

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Abnormal current dependence of high-level reverse intersystem crossing induced by Dexter energy transfer from hole-transporting layer

Abstract:
High-level reverse inter-system crossing (HL-RISC, T2, rub  S1, rub) in rubrene molecules has been recently found as a potential evolution channel of excitons for realizing high-efficiency organic light-emitting diodes...

Cited by 1 publication

References 41 publications

Realization of H-Type Aggregation in Rubrene-Doped OLEDs and Its Induced Enhancement of Delayed Fluorescence

Realization of H-Type Aggregation in Rubrene-Doped OLEDs and Its Induced Enhancement of Delayed Fluorescence

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Abnormal current dependence of high-level reverse intersystem crossing induced by Dexter energy transfer from hole-transporting layer

Abstract: High-level reverse inter-system crossing (HL-RISC, T2, rub  S1, rub) in rubrene molecules has been recently found as a potential evolution channel of excitons for realizing high-efficiency organic light-emitting diodes...

Cited by 1 publication

References 41 publications

Realization of H-Type Aggregation in Rubrene-Doped OLEDs and Its Induced Enhancement of Delayed Fluorescence

Realization of H-Type Aggregation in Rubrene-Doped OLEDs and Its Induced Enhancement of Delayed Fluorescence

Contact Info

Product

Resources

About

Abstract:
High-level reverse inter-system crossing (HL-RISC, T2, rub  S1, rub) in rubrene molecules has been recently found as a potential evolution channel of excitons for realizing high-efficiency organic light-emitting diodes...