Material degradation of liquid organic semiconductors analyzed by nuclear magnetic resonance spectroscopy

Fukushima, Tatsuya; Yamamoto, Junichi; Fukuchi, Masashi; Hirata, Shuzo; Jung, Heo Hyo; Hirata, Osamu; Shibano, Yuji; Adachi, Chihaya; Kaji, Hironori

doi:10.1063/1.4928515

Cited by 7 publications

(6 citation statements)

References 20 publications

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“…Thus, the introduction of the PCP moiety appreciably reduces the ionization potential (IP) of the donor and thus the electrochemical gap. Expectedly, the oxidation waves of both compounds were found to be irreversible as the carbazole radical cation is known to be electrochemically unstable and subsequently can undergo dimerization 21…”

Section: Resultsmentioning

confidence: 99%

Turn on of sky-blue thermally activated delayed fluorescence and circularly polarized luminescence (CPL) via increased torsion by a bulky carbazolophane donor

et al. 2019

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Section: Resultsmentioning

confidence: 99%

Turn on of sky-blue thermally activated delayed fluorescence and circularly polarized luminescence (CPL) via increased torsion by a bulky carbazolophane donor

et al. 2019

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“…However, in most liquid OLEDs, the decomposition time is very short. To figure out the origin of the material degradation, Adachi's group characterized the products of a liquid emitting layer, namely, CBZ2 , during driving of the OLED device . 1 H and 13 C NMR spectra confirmed the dimerization of CBZ2 , which should be responsible for the device degradation.…”

Section: Versatile Applications Of Lmlsmentioning

confidence: 99%

Solvent‐Free Luminous Molecular Liquids

Nakanishi

2019

Advanced Optical Materials

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Solvent‐free luminous molecular liquids (LMLs) are a new generation of soft matter which exhibit uncharged, nonvolatile, and fluidic nature and emit intense and homogeneous luminescence in the condensed state. They can be produced readily on the gram scale by modifying luminophores with bulky, flexible, and low‐melting side chains. Their performance can be facilely enriched by blending them with commercially available functional substances. Therefore, since their active optoelectronic properties were perceived a decade ago, LMLs have been regarded as promising contributing components in the burgeoning field of flexible and wearable light‐emitting devices. Recently, richer insights into LMLs have triggered various new applications. Additionally, unexpected phase behavior and photophysical properties have been discovered coincidentally. Therefore, the sensible and sophisticated molecular design principles of LMLs are still being augmented to guarantee predictable, steady, and consistent end‐use performance. This review summarizes the latest developments in LMLs, including molecular design principles, regulation and enrichment of their photophysical properties, and their versatile applications. Additionally, a prediction of the perspectives of LMLs in the near future is presented at the end.

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“…This limitation is due to the paucity of our understanding of the structural factors governing the intrinsic stability of materials. Although recent research has investigated the influence of structural modifications on stability 20 , 21 , the molecular parameters that govern intrinsic stability have to date been poorly elucidated. Considering their enormous potential, it is thus of profound importance to establish the structure–stability relationship of TADF molecules.…”

Section: Introductionmentioning

confidence: 99%

Conformation-dependent degradation of thermally activated delayed fluorescence materials bearing cycloamino donors

et al. 2020

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Organic light-emitting devices (OLEDs) containing organic molecules that exhibit thermally activated delayed fluorescence (TADF) produce high efficiencies. One challenge to the commercialization of the TADF OLEDs that remains to be addressed is their operational stability. Here we investigate the molecular factors that govern the stability of various archetypal TADF molecules based on a cycloamino donor–acceptor platform. Our results reveal that the intrinsic stability depends sensitively on the identity of the cycloamino donors in the TADF compounds. The rates and photochemical quantum yields of the degradation are positively correlated with the operation lifetimes of the devices. Our research shows that the stability is governed by the conformeric heterogeneity between the pseudo-axial and pseudo-equatorial forms of the cycloamino donor. Spontaneous bond dissociation occurs in the former (i.e., the pseudo-axial form), but the cleavage is disfavored in the pseudo-equatorial form. These findings provide valuable insights into the design of stable TADF molecules.

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Material degradation of liquid organic semiconductors analyzed by nuclear magnetic resonance spectroscopy

Cited by 7 publications

References 20 publications

Turn on of sky-blue thermally activated delayed fluorescence and circularly polarized luminescence (CPL) via increased torsion by a bulky carbazolophane donor

Turn on of sky-blue thermally activated delayed fluorescence and circularly polarized luminescence (CPL) via increased torsion by a bulky carbazolophane donor

Solvent‐Free Luminous Molecular Liquids

Conformation-dependent degradation of thermally activated delayed fluorescence materials bearing cycloamino donors

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