High-Efficiency Red-Light Emission from Polyfluorenes Grafted with Cyclometalated Iridium Complexes and Charge Transport Moiety

Abstract

We report a new route for the design of electroluminescent polymers by grafting high-efficiency phosphorescent organometallic complexes as dopants and charge transport moieties onto alky side chains of fully conjugated polymers for polymer light-emitting diodes (PLED) with single layer/single polymers. The polymer system studied involves polyfluorene (PF) as the base conjugated polymer, carbazole (Cz) as the charge transport moiety and a source for green emission by forming an electroplex with the PF main chain, and cyclometalated iridium (Ir) complexes as the phosphorescent dopant. Energy transfer from the green Ir complex or an electroplex formed between the fluorene main chain and side-chain carbazole moieties, in addition to that from the PF main chain, to the red Ir complex can significantly enhance the device performance, and a red light-emitting device with the high efficiency 2.8 cd/A at 7 V and 65 cd/m2, comparable to that of the same Ir complex-based OLED, and a broad-band light-emitting device containing blue, green, and red peaks (2.16 cd/A at 9 V) are obtained.

Twin Probes as a Novel Tool for the Detection of Single‐Nucleotide Polymorphisms

“…Also, the need for dual labeling of an oligonucleotide at both the 5'-and 3'-ends can be eliminated, which makes the twin probe assay relatively inexpensive. In addition, one of the 3'-ends in the twin probe, or one of the alkyl chains of the fluorene moiety, [32] could be used for immobilization to transfer the twin probe assay into a chip-based format.…”

Synthesis and Characterization of Red Electrophosphorescent Polymers Containing Pendant Iridium(III) Complex Moieties

“…8 and 3,6-dibromo-9-(tridecane-10,12-dionyl)-9H-carbazole 14 were synthesized according to reported procedures. The structure of the obtained iridium complex monomer 1 was confirmed by 1 H NMR as shown in Figure 1.…”

“…8 and 3,6-dibromo-9-(tridecane-10,12-dionyl)-9H-carbazole 14 were prepared according to literature procedures. All manipulations involving IrCl 3 ·3H 2 O and other Ir(III) species were performed in a dry nitrogen atmosphere.…”

Design and Synthesis of Phosphorescent Iridium Containing Dendrimers for Potential Applications in Organic Light‐Emitting Diodes

“…The development of solutionprocessible phosphorescent materials has become the focus of intense researches in this field. [20][21][22][23] Given that carbazole-based materials are widely used as hosts for triplet emitters in OLEDs, it is not surprising that a variety of carbazole oligomers have been attached to iridium complexes. [10,12,24] In this study, we designed and synthesized two branched carbazole oligomers and then attached them to a core iridium complex by Suzuki coupling.…”