Synthesis, structures, DFT studies and luminescent properties of copper(I)-diimine complexes and application in yellow-green light-emitting diode

Mixed Ligand Copper(I) Complexes as Emitters Enable Higher OLED Device Performance for Energy-Harvesting Applications

“…Researchers have produced emitters for phosphorescent organic light-emitting diodes using a variety of heterocyclic cores, such as pyridine-, pyrimidine-, and pyrazine-containing materials (OLEDs) (Table ). − The heterocyclic cores and the orientations of their nitrogen atoms can be changed to adjust the energy levels, and adding one or two nitrogen atoms to the parent compounds reduced the singlet–triplet exchange energy (EST). When compared with those without any heterocyclic cores, they can also increase bipolarity.…”

Photophysical properties of homobimetallic Cu(i)–Cu(i) and heterobimetallic Cu(i)–Ag(i) complexes of 2-(6-bromo-2-pyridyl)-1H-imidazo[4,5-f][1,10]phenanthroline

“…Since the groundbreaking work of α-diimine-Cu( i )–phosphine complexes with the earth-abundant and environmentally benign metal copper was reported by McMillin's group in the late 1970s, 1,2 these systems have attracted more and more attention because of their good room temperature phosphorescence in the solid state, long luminescence lifetime and tunable emission, 3–35 followed by the corresponding applications in organic light-emitting diodes (OLEDs), 11,13,24–27 bioimaging, 28 chemosensors, 10,29–32 and photocatalysis. 14,18,33–35 In recent years, the thermally activated delayed fluorescence (TADF) exhibited by α-diimine-Cu( i )–phosphine complexes led to their further development into a research boom.…”

“…26,33–35 However, the relatively low emission efficiency in the solutions has become the main obstacle to their applications. 3–38 To solve this problem, some strategies have been adopted. First, the light-harvesting ability of the system is improved by increasing the conjugation degree and rigidity of the α-diimine ligands.…”