A series of D-π-A, D-π-D, and A-π-A
based push–pull
compounds with triarylamine and benzophenone were designed and synthesized
for nonvolatile memory applications. All of the compounds showed good
solubility in common organic solvents, which permits solution processability.
D-π-A based compounds exhibited write-once-read-many (WORM)
memory applications, and the compound with a methoxyphenyl substituent
exhibited switching with a low threshold voltage of −0.82 V,
an ON/OFF current ratio of 102, and a long-lasting retention
time of 103 s. The effect of differently functionalized
triarylamines on memory behavior was explored by optical, electrochemical,
and computational studies. The highest HOMO levels of around ∼5.0
eV and irreversible anodic peaks (0.7–1.3 V) obtained for the
compounds facilitate charge injection and switching behavior. Besides,
electrochemical and density functional theory studies disclose the
charge-transfer mechanism of the D-π-A systems, which is related
to the bistability of the devices.
Integration of devices for their efficiency is considered to be the future goal of organic electronics. One such highly integrated device which combines the properties of both the organic field-effect transistor and organic light-emitting diodes are the organic light-emitting transistors (OLETs). These devices are exceedingly preferred for their enhanced properties/performance in terms of both mobility and luminescence. It becomes a singly stacked device enabling the integration of both a transistor and a light emitter in the same. Although it is a budding field of organic electronics, limited literature is available which keeps on increasing due to its high advantages in many applications. This review gives a brief knowledge of the OLETs being fabricated recently using different materials and the developments in device fabrications. The review looks through an organic chemist's perspective, digging into many ways through which an OLET material can be designed and characterized. It also looks through the developments made in the device architecture during the years enabling better performance through many different ways.
A series of D-A-D architectured molecules with quinoline as the central core and triarylamines (TAA) at both terminals were synthesized and studied for their memory performance. The photophysical studies exhibited...
A series of new triarylamine appended alkoxyphenanthrenes connected through acetylene bridges were synthesized for high-performance p-channel OFETs. These semiconductors exhibited high-lying HOMO energy levels up to -5.16 eV, enabling hole-transporting...
Organic light‐emitting diodes (OLEDs) have exceeded expectations in terms of portability and affordability; still there is potential for advancement in terms of efficiency and color changeability. Research on flexible displays and OLED light emission is hampered by the low solid‐state efficiency and bandgap discrepancies of blue light emitters. However, aggregation‐induced emission (AIE) presents an opportunity to create efficient blue emitters. By suppressing the π‐π stacking interactions, triphenylethene (TriPE) and tetraphenylethene (TPE) molecule‐based AIE luminogens exhibit outstanding solid‐state emission and increased device efficiency. Additionally, the presence of TriPE and TPE donor units in the architecture of non‐donor–acceptor (non‐D–A)‐ and donor–acceptor (D–A)‐based architectures has increased chemical and thermal stability with high efficiency. This article emphasizes multiple device architectures and different light emissions (blue, red, and green) set forth by potential electron donating/accepting molecules possessing intriguing efficiency in the device fabrication. It also presents the substitution effect on TriPE and TPE donor units and the applicability of non‐D–A and D–A systems in OLEDs.
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