The 1,2,4-triazole system has shown excellent electron-transport and hole-blocking properties owing to
its highly electron-deficient nature. Accordingly, a large number of 1,2,4-triazole derivatives have been described
as having a wide variety of uses in materials science. Triazoles are widely used in transition-metal complexes or
metal-organic frameworks (MOFs), but metal-free 1,2,4-triazole derivatives have also exhibited interesting and
useful properties as materials. The use of these derivatives, either as small molecules or polymers, in light-emitting
devices has allowed the fabrication of OLEDs, PHOLEDs and PLEDs with excellent properties. Other materials
have exhibited liquid crystalline or optical waveguide behavior or have found applications in PEMFCs, organic
photovoltaic cells and data storage devices. The aim of this review is to discuss the most important metal-free derivatives bearing 1,2,4-
triazole moieties with applications as organic materials.
Keywords: Data storage, NLO applications, OFET, OLED, optical waveguide, organic photovoltaic cell, PLED, TADF emitter.
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