Wide‐Range Color Tuning of Iridium Biscarbene Complexes from Blue to Red by Different N⁁N Ligands: an Alternative Route for Adjusting the Emission Colors

Abstract

Four new iridium biscarbene complexes with different N⁁N ligands showing very different emission colors from deep‐blue to red are synthesized. The emission colors are mainly controlled by the N⁁N ligands. The electroluminescent devices using these complexes as dopant emitters exhibit extremely high efficiencies.

Deep-Red Phosphorescent Iridium(III) Complexes Containing 1-(Benzo[b] Thiophen-2-yl) Isoquinoline Ligand: Synthesis, Photophysical and Electrochemical Properties and DFT Calculations

“…b Degassed dichloro-methane at room temperature shown in Fig. 4, the emission spectra of all complexes show broad and structureless, indicating that their emissive excited states have 3 MLCT character rather than ligand-centered ( 3 LC) character [39,40]. From Table 3, it can be seen that the emission maxima are in the range 682-698 nm and their emission colors are deep-red.…”

Manipulating efficiencies through modification of N-heterocyclic phenyltriazole ligands for blue iridium(III) complexes

“…All experiments were performed under a nitrogen atmosphere by using standard Schlenk techniques. The ligands Hfpdmtz, Hfpmptz, Hpypz and Hmpypz were conveniently synthesized according to early reported literatures [33,34,40]. Complexes 1e3 were prepared with a similar synthetic procedure according to the reported method (Scheme 1) [35].…”

“…5-(4-Fluorophenyl)-1,3-dimethyl-1H-1,2,4-triazole (Hfpdmtz) and 5-(4-fluorophenyl)-1-methyl-3-propyl-1H-1,2,4-triazole (Hfpmptz) were selected as cyclometalated ligands while 2-(1H-pyrazol-3-yl)pyridine (Hpypz) and 4-methyl-2-(1H-pyrazol-3-yl)pyridine (Hmpypz) were chosen as ancillary ligands because of their ability to conveniently form iridium(III) complexes [34,35]. The theoretical calculations suggest the designed complexes will display emissions at the blue-light region.…”

Enabling a bright orange–red emission with a high EQE with a seven-member-ring based fluorescent emitter with a matching host

“…The synthesis was accomplished by a condensation reaction of reactant-3, i.e. 3-formyl-7-(N,N-diphenylamino)-5,5-spirofluorenyl-5H-dibenzo-[a,d]cycloheptene [19][20][21][22], with malononitrile (0.38 mL, 6.0 mmol) in the presence of acetic acid (0.25 mL, 0.05 mmol) and molecule sieve 4 Å A 0 (300 mg) in peridine (10 mL). The reaction mixture was stirred at ambient temperature for 4 h and then quenched with aqueous CH 3 COOH (HOAc/H 2 O = 1/9, 20 mL).…”

“…At 25,000 cd/m 2 , for example, an orange-red emission that peaked at 612 nm was observed with an EQE of 7.2%, with a corresponding efficacy of 2.3 lm/W and current efficiency of 11.4 cd/A. Notably, the device efficiencies are higher than those of the reported orange-red OLED devices even including those based on red phosphorescent dyes at similar luminance [19][20][21][22].…”