Highly efficient cuprous complexes with thermally activated delayed fluorescence and simplified solution process OLEDs using the ligand as host

Abstract

Two highly emissive cuprous complexes with TADF were synthesized. The ligand was used both as a ligand to form the emissive cuprous complex and as a host matrix for the formed emitter in a solution-processed OLED.

Four highly efficient cuprous complexes and their applications in solution-processed organic light-emitting diodes

“…5,[32][33][34] In these heteroleptical Cu(NN)(POP) + complexes, the HOMOs have predominant contribution from the metal d orbital and the POP ligand, and the LUMOs are on the diimine ligands, indicating an emission from metal and ligand to ligand charge transfer ((M + L)LCT)) excited state. 37,38 Although neutral Cu(I) complexes without small counterions achieve higher device performance than those with counterions, 39-44 these complexes containing N À -ligands and halogen counterions have much lower stability [45][46][47] or are more difficult to adjust the emission spanning the whole visible region. 33 Meanwhile, their LUMOs and T 1 levels can be further elevated by the introduction of electron-rich and bulky steric hindrance diimine ligands which has already led to highly efficient photoand electro-luminescence of Cu(I) complexes.…”

Efficient one-pot green synthesis of tetrakis(acetonitrile)copper(i) complex in aqueous media

“…[9][10][11][12][13] At the same time they serve as important precursors for the synthesis of overwhelming majority of mononuclear [14][15][16] and homo- 17 and hetero-polynuclear 18,19 copper(I) complexes, which also have numerous practical applications, [20][21][22] one of which is large-scale production of emitting materials for OLED fabrication. 23 Total number of references related to these compounds as reagents/reactants exceeds 3100 (over 100 of them during 2018 year), including the papers in journals of highest rank. It is obvious that production of these compounds is of great importance for research and industry and simple, economical and environmentally friendly method of synthesis is of high demand.…”

Origin of a counterintuitive yellow light-emitting electrochemical cell based on a blue-emitting heteroleptic copper(i) complex

“…In addition, they typically show a two-excited state radiative mechanism that involves the thermal repopulation of the emitting singlet excited state from the lowest-lying triplet state, i.e., thermally activated delayed fluorescence (TADF). 5,7,8,[17][18][19] Thus, the implementation of copper(I) complexes in lighting devices might provide an efficient way to reform the emitting singlets, i.e., singlet harvesting, increasing the spin statistics and the device efficiency. [1][2][3][4][5][6][7][8]19 Encouraged by the aforementioned, heteroleptic copper(I) complexes based on diimine (N^N) and diphosphine (P^P) ligands, i.e., [Cu(N^N)(P^P)] + , have been recently revisited by several groups.…”

“…5,7,8,[17][18][19] Thus, the implementation of copper(I) complexes in lighting devices might provide an efficient way to reform the emitting singlets, i.e., singlet harvesting, increasing the spin statistics and the device efficiency. [1][2][3][4][5][6][7][8]19 Encouraged by the aforementioned, heteroleptic copper(I) complexes based on diimine (N^N) and diphosphine (P^P) ligands, i.e., [Cu(N^N)(P^P)] + , have been recently revisited by several groups. 2,9,12,14,17,18,20,21 They have established several simple guidelines for enhancing both the synthesis protocol 20,21 and the ligand design 2,17,18 to take full advantage of the photoluminescence and electrochemical features of these materials.…”

“…Copper(I) complexes are considered as a rising electroluminescent material for organic light-emitting diodes (OLEDs) [1][2][3][4][5][6][7][8] and light-emitting electrochemical cells (LECs). [9][10][11][12][13][14][15][16] This is attributed to their simple and low-cost synthesis, as well as the ease of chemical modifications for fine-tuning their photoluminescence and electrochemical features.…”