Designing of luminescent complexes of europium(III) ion with hydroxyl ketone and nitrogen donor secondary ligands for improving the luminescence performance and biological actions

In order to realize efficient organic light-emitting diodes (OLEDs) with good color-purity, iridium(III) (Ir(III)) emitters with high luminous efficiency and narrow full width at half maxima (FWHM) are required. In this work, two main ligands incorporating a pyrido[3′,2′:4,5]pyrrolo[3,2,1-jk]carbazole unit with a rigid structure to realize carrier recombination balance and restrict intramolecular relaxation were developed. Four Ir(III) complexes with isomers peaking at 500 and 551 nm exhibit short phosphorescence lifetimes lower than 1 μs, high photoluminescence quantum yields of up to 89% and narrow FWHMs of 37 nm. Moreover, the devices based on two of the complexes with better thermal stability (>400 °C) show high external quantum efficiencies (EQEmax) of 23.8% and 24.5%, respectively, with efficiency roll-offs of less than 5%. Particularly, the electroluminescence FWHM bandwidth of one device is only 30 nm, which was rarely reported for Ir(III) complex-based OLEDs. Therefore, the strategy for main ligands with rigid structures provides an innovative method for realizing efficient Ir(III) complex-based OLEDs with narrow emissions.

Efficient organic light-emitting diodes with narrow emission bandwidths based on iridium(III) complexes with a pyrido[3′,2′:4,5]pyrrolo[3,2,1-jk]carbazole unit

Acetylene surrogates are efficient tools in modern organic chemistry with largely unexplored potential in the construction of heterocyclic cores. Two novel synthetic paths to 3,6-disubstituted pyridazines were proposed using readily available acetylene surrogates through flexible C2 unit installation procedures in a common reaction space mode (one-pot) and distributed reaction space mode (two-chamber): (1) an interaction of 1,2,4,5-tetrazine and its acceptor-functionalized derivatives with a CaC2 -H2 O mixture performed in a two-chamber reactor led to the corresponding pyridazines in quantitative yields; (2) [4+2] cycloaddition of 1,2,4,5-tetrazines to benzyl vinyl ether can be considered a universal synthetic path to a wide range of pyridazines. Replacing water with D2 O and vinyl ether with its trideuterated analog in the developed procedures, a range of 4,5-dideuteropyridazines of 95-99% deuteration degree was synthesized for the first time. Quantum chemical modeling allowed to quantify the substituent effect in both synthetic pathways.

One-Pot and Two-Chamber Methodologies for Using Acetylene Surrogates in the Synthesis of Pyridazines and Their D-Labeled Derivatives.

Cyclometalated Ir(III) complexes hold great promise as an alternative to platinum metallodrugs for therapy and diagnosis of cancer. However, low aqueous solubility and poor cell membrane permeability difficult in vivo...

/pdf/polyurethane-polyurea-hybrid-nanocapsules-as-efficient-1aumj5se.pdf

Polyurethane-polyurea hybrid nanocapsules as efficient delivery systems of anticancer Ir(III) metallodrugs

Tailoring optoelectronic properties of benzimidazole-based iridium(Ⅲ) complexes through rational isomer engineering

Three novel phosphorescent iridium(III) complexes with thieno[2,3-d]pyridazine derivatives as cyclometalating chelates were successfully synthesized. These complexes exhibited intense green or yellow phosphorescence emission with short lifetimes of 1.71–1.91 μs and very high quantum yields of over 85% in PMMA films. Even in air-equilibrated CH2Cl2, their quantum yields could be up to 36%. They also showed good thermal stability with Td > 338 °C. The electronic structure information of these complexes was discussed by density functional theory. The tris-cyclometalated complex Ir1 was an excellent yellow phosphorescent dopant for OLED applications, and the maximum CE and PE based on it were 58.5 cd A−1 and 45.9 lm W−1, respectively, with the maximum EQE of 18.2% which was ca. 1.4 times more efficient than that of PO-01. These results indicate that these new complexes have potential applications as efficient phosphors in OLEDs.

High stability and luminance efficiency thieno[2,3-d]pyridazine-based iridium complexes and their applications in high-performance yellow OLEDs

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High stability and luminance efficiency thieno[2,3-d]pyridazine-based iridium complexes and their applications in high-performance yellow OLEDs