Schiff Bases and Their Complexes in Organic Light Emitting Diode Application

Abstract

Optoelectronics is an active area of research and, for few decades, development of different semiconducting materials with a wide emission window has attracted researchers. Organic light emitting diodes (OLEDs) are primarily utilized in displays and light sources that greatly contribute towards the conservation of energy and do not need a backlight for displays. Development in device efficiency, lifetime and stability is now a major concern in this particular application, and designing efficient material for OLEDs has been an active field of research for decades. Metal-organic compounds possess different optical and electronic properties due to metal and organic ligand interactions which are primarily used in OLEDs. This review is mainly focused on the Schiff bases and their metal chelates as a pure emitting layer or as a dopant material for the fabrication of R/G/B/white emitting devices. Moreover, future prospects to explore further to advance research in the OLED arena are also discussed. Graphic Abstract

Catalyst-free mechanochemistry as a versatile tool in synthetic chemistry: a review

“…Furthermore, the salen–metal complexes have a wide range of applications in catalysis, including ring-opening metathesis polymerization (ROMP), fluorescent indicators and organic light-emitting diodes. 88 Hence, the development of sustainable methods for the synthesis of salen-based ligands and their metal complexes is in high demand. In this regard, Ferguson et al described a mechanochemical (ball milling) synthesis of salen ( 102a ) and four other salen-based ligands ( 102 ) including Jacobsen ligand ( 102b ) from salicylaldehydes ( 100 ) and organic 1,2-diamines ( 101 ), and the salen was used for the one-pot synthesis of its Zn, Ni and Cu complexes ( 103 ) by adding the metal precursors [such as ZnO or Ni(OAc) 2 ·4H 2 O or Cu(OAc) 2 ·H 2 O] directly to the reaction mixture followed by carrying out the reactions under the same conditions (Scheme 36).…”

Schiff Base as Multifaceted Bioactive Core

“…The mentioned methods/systems revealed some drawbacks, including the need for high reaction temperatures, prolonged reaction times, and moisture-sensitive catalysts, huge amounts of aromatic solvents, expensive dehydrating reagents/catalysts, and specialized equipment [57]. NaHSO 4 .SiO 2 / microwave/solvent-free [58], dirhodium caprolactamate [59], [bmim] BF 4 /molecular sieves [60], silica/ultrasound irradiation [61], silica/microwave [19], and silica/solvent-free [62].…”

Circularly Polarized Luminescence from Schiff‐base [4]Helicene Boron Complexes

“…Schiff-base (N O)-chelate boron complexes have been recognized as efficient fluorophores with potential applications in organic light-emitting diodes (OLEDs). [12,13] Their Schiff-base ligands can be easily prepared from the corresponding aldehyde derivatives, allowing for a variety of luminescence properties based on molecular modification. Furthermore, the introduction of chiral skeletons such as helicenes, [11n,14] 1,1'binaphthyls, [15] and cyclophanes [16] into the Schiff-base ligands enables the development of CPL-active materials.…”