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The Design and Synthesis of Emissive π-conjugated Solid-State Luminophores

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The design and synthesis of emissive π-conjugated solid-state luminophores has influenced the tremendous interest due to their broad application in various fields, such as organic light emitting diodes (OLEDs) bio-imaging, organic solid-state lasers (OSSLs) and sensors For full-color display, red, green, and blue (RGB) color with relatively equal stability, efficiency, and color purity is required. Among the color of (RGB), the blue emitter is of most significance because reduce the power consumption, but can also be used to produce light of some other colors by energy cascade to a lower-energy fluorescent or phosphorescent dopants.

Therefore, needs of blue OLEDs with low cost, high efficiency have been required to launch the commercialization of OLEDs. Nitrogen heterocyclic compounds like carbazole with strong election acceptor group triazole derivatives, with high emission efficiency have attracted attention towards them. They are also utilised as a chromospheres with the high extinction coefficient, absorption wavelength fluorophoric properties and readily tuneable.

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Still finger marks are the key evidence in investigations of criminals. And recognised as a international standard in human identification. Each person has unique fingermarks, which remain unchanged until their lifetime. Uniqueness is interpreted on the basis of their ridge characteristics such as island, bifurcation, enclosure and ridge ending. When finger touch the surface, a fingermark is left behind. Few are invisible to the naked eye but some of these marks are visible. These latter marks are termed latent fingermarks. Such fingermarks require a physical or chemical method in order to visualize the invisible marks. Powdering is the most commonly used method for fingermark visualization.

A several methods have been implemented to enhance the LFMs using physical methods, chemical methods, combining physical and chemical methods, optical imaging techniques, and fluorescent organic aggregates. Even though several analytical processes powder dusting method is the most commonly used technique in forensic investigations. But fluorescent powder method of (LFT) also has some drawbacks, viz., assured damage to the fingerprint details and also health hazard to the examiners. To avoid these, Yan Li et al., has recently reported an aggregation induced emission (AIE) phenomenon to lift the LFMs. However, strongly emissive property has been exhibited by many conjugated organic compounds in dilute solution but luminescence weakened or quenched in concentrated solution or solid.

This “concentration quenching” has been referred to as “aggregation caused quenching” (ACQ).AIE strategy is an outright wet method and hence it is more eco and user friendly than the conventional powder dusting method. However, the reported AIE methods to lift the LFMs require sophisticated imaging instruments. So, a simple, portable and cost effective alternate is needed for the enhancement and visualization of LFMs especially during real time analysis. But the blue EL performances employing AIEgens were quite far from the demands of practical applications Therefore, the development of AIEgens as emitter for blue organic light emitting diodes were still a tremendous challenge.

Hence, continuation of our investigation on new blue light emitting organic heterocyclic compounds. herein we report the intensive blue light emitting 2-(1-(3,5-bis(trifluoromethyl)phenyl)-4,5-diphenyl-1H-imidazol-2-yl)phenol (4) compound and its structural properties. The characterization includes, IR, 1H-NMR, 13C NMR, SEM and EDAX were recorded to establish the structure of the newly synthesized compound.


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