Optoelectronic characterization of zinc complexes for display device applications

Abstract

2-(2-Pyridyl)benzimidazolato)-2-methyl-8-hydroxyquinolinatozinc(II)[ZnPBI(Meq)], 2-(2-pyridyl)benzimidazolato)-5-chloro-8-hydroxyquinolinatozinc(II) [ZnPBI (Clq)] and 2-(2-pyridyl)benzimidazolato)-8-hydroxyquinolinatozinc(II) [ZnPBI(q)] were synthesized and characterized for the purpose to be used as electroluminescent materials. All complexes emitted bright colored light on excitation by ultraviolet light source which showed their suitability for the operation in opto-electronic devices. Using a selected complex [ZnPBI(Meq)] as emissive layer, multilayered organic electroluminescent device was fabricated having structure ITO/a-NPD/Zinc complex/BCP/Alq 3 /LiF/Al, that produced bright bluish green emission at 532 nm. Maximum luminescence observed was 4038 cd/m 2 at 18 V while the turn on voltage of the device was 7 V. The Commission Internationale d'Eclairage chromaticity of the device had color coordinates at x = 0.35, y = 0.44 and was found to be independent of the operating voltages. The [ZnPBI(Meq)] complex exhibited high thermal stability ([300°C) and high glass transition temperature ([150°C).

Synthesis and characterization of a mononuclear zinc(ii) Schiff base complex: on the importance of C–H⋯π interactions

“…Zinc(II) complexes have lots of important applications as useful electronic and opto-electronic materials. [1][2][3][4][5] Many zinc(II) complexes have also been prepared recently to explore their potential use in photonic devices. 6 The importance of zinc(II) in biology is well known.…”

The importance of spodium bonds, H-bonds and π-stacking interactions in the solid state structures of four zinc complexes with tetradentate secondary diamine ligands

“…The potential ability of zinc complexes to be used in the fabrication of different photonic devices [1][2][3][4][5][6][7][8][9][10][11] is one of the driving forces for their synthesis. [12][13][14][15][16][17] The importance of zinc complexes in biological science is based on their ability to mimic many metalloenzymes. [18][19][20][21] In addition, the ability of zinc complexes to degrade different organic dyes (pollutants) in aqueous solution has been reported in the literature.…”

Self-Assemblies of Zinc Complexes for Aggregation-Induced Emission Luminogen Precursors

“…The self-assembly of various zinc complexes shows novel emission properties. − Many zinc complexes have prospects as applied optoelectronic materials. − Besides enhanced chemical reactivity for catalytic reactions, − optoelectronic properties of zinc oxide necessitate the study of polynuclear zinc clusters possessing a ZnO 4 environment. − Solvent plays an important role in the synthesis of such zinc clusters or coordination polymers. , Design of ligands − and improvisation of noncovalent interactions of ligands are common ways to synthesize complexes with less conventional coordination numbers such as five-coordinated , zinc complexes. A careful look at the number of zinc complexes suggests that, irrespective of ligands, they show emissions near 400–430 nm with some exceptions. − Some d 10 zinc complexes show sample- and size-dependent fluorescence emissions, whereas in certain cases, aggregation-induced emissions (AIE) of zinc complexes are comparable to similar emissions by corresponding d 10 cadmium complexes .…”