724434-38-2

Upstream product

• 329-15-7 4-trifluoromethyl-phenyl acetyl chloride 
• 7466-54-8 2-methoxybenzoylhydrazine 
• 1616352-89-6 C₁₆H₁₃F₃N₂O₃ 
• 2251-65-2 3-(Trifluoromethyl)benzoyl chloride 

Downstream Products

• 633278-86-1 2-(5-(4-trifluoromethyl-phenyl)-1,3,4-oxadiazol-2-yl)phenol 

Relevant academic research and scientific papers

Syntheses, crystal structure and photophysical property of iridium complexes with 1,3,4-oxadiazole and 1,3,4-thiadiazole derivatives as ancillary ligands

Six iridium complexes with 2-(2-trifluoromethyl)pyrimidine-pyridine as the main ligand and 2-(5-phenyl-1,3,4-oxadiazol-2-yl)-phenol or 2-(5-phenyl-1,3,4-thiadiazol-2-yl)-phenol derivatives as ancillary ligands were synthesized. The crystal structures of the complexes adopted pseudo-octahedral coordination geometry with the conventional trans-N, cis-C arrangement of main ligand and the ancillary ligand was connected to iridium center by an N atom from 1,3,4-oxadiazole or 1,3,4-thiadiazole group and an O atom from phenol moiety. Electrochemical study confirmed the ancillary ligand variations have effects on the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels. The density functional theory (DFT) calculations suggested that the frontier orbitals and the electronic properties of the complexes can be manipulated by introducing different ancillary ligands. The compositions of LUMO on the 1,3,4-thiadiazole ancillary ligands are higher than that of 1,3,4-oxadiazole derivatives, and the HOMO - LUMO gaps are also decreased. Therefore, the emissions of the complexes with 1,3,4-thiadiazole ancillary ligands are shift from green to red. The organic light-emitting diodes with Ir3 and Ir6 as emitters show maximum current efficiencies of 41.08 and 50.92 cd/A, respectively, with mild efficiency roll-off. This work provides a way to tune the emission and device efficiency of IrIII complexes by introducing of 1,3,4-thiadiazole group in ancillary ligand.

Efficient organic light-emitting diodes with low efficiency roll-off using iridium emitter with 2-(5-phenyl-1,3,4-oxadiazol-2-yl)phenol as ancillary ligand

Using 2,4,5-trifluorophenylpyridine as a monoanionic cyclometalated ligand, 2-(5-phenyl-1,3,4-oxadiazol-2-yl)phenol, 2-(5-(4-fluorophenyl)-1,3,4-oxadiazol- 2-yl)phenol and 2-(5-(4-trifluoro-methylphenyl)-1,3,4-oxadiazol-2-yl)phenol as ancillary ligands, three new heteroleptic iridium(III) complexes (Ir(F 3,4,6ppy)2POP, Ir(F3,4,6ppy)2FPOP and Ir(F3,4,6ppy)2CF3POP) were developed. All complexes are green phosphors (λmax = 503-521 nm) with photoluminescence quantum efficiency yields of 12-18% in CH2Cl 2 solutions at room temperature, respectively. The organic light emitting diodes (OLEDs) with the structure of ITO/TAPC (1,1-bis(4-(di-p- tolylamino)phenyl)cyclohexane, 60 nm)/Ir(F3,4,6ppy)2POP (6, 8, 10 wt%): SimCP2 (bis(3,5-di(9H-carbazol-9-yl)phenyl)diphenylsilane, 30 nm)/TPBi (1,3,5-tri(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl, 90 nm)/LiF (1 nm)/Al (100 nm) showed good performances. Particularly, the device with 8 wt% doped concentration exhibited superior performances with a peak current efficiency (ηc) of 61.49 cd A-1 and a peak power efficiency (ηp) of 46.03 lm W-1. Furthermore, the efficiency roll-off ratios from the peak current efficiency to that at the practical luminance of 100 cd m-2 and from 100 cd m-2 to the benchmark brightness of 1000 cd m-2 in this device are low, which are helpful to keep high efficiency at relatively high current density and high luminance.