کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1325857 977406 2006 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis, structure, electrochemistry, photophysics and electroluminescence of 1,3,4-oxadiazole-based ortho-metalated iridium(III) complexes
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Synthesis, structure, electrochemistry, photophysics and electroluminescence of 1,3,4-oxadiazole-based ortho-metalated iridium(III) complexes
چکیده انگلیسی

Four new iridium(III) complexes 1–4, with 1,3,4-oxadiazole derivative as cyclometalated ligand for the first time, have been synthesized and structurally characterized by NMR, EA, MS and X-ray diffraction analysis (except 1). The stronger ligand field strength of the dithiolate ancillary ligands results in higher oxidation potentials and lower HOMO energy levels of complexes than acetylacetone. The absorption spectra of these complexes display low-energy metal-to-ligand charge transfer transition ranging from 350 to 500 nm. Complexes with dithiolate ancillary ligand emit at maximum wavelengths of ca. 500 nm, blue shifting 17 and 11 nm with respect to their counterpart with acetylacetone ligand. The electrophosphorescent devices with 2–4 as phosphorescent dopant in emitting layer have been fabricated. All devices have a low turn-on voltage in the range of 4.5 and 4.9 V. A high-efficiency green emission with maximum luminous efficiency of 5.28 cd/A at current density of 1.37 mA/cm2 and a maximum brightness of 2592 cd/m2 at 15.2 V has been achieved in device using 2 as emitter.

Synthesis, characterization, crystal structure, electrochemical, photophysical and electroluminescent properties of four new iridium(III) complexes with 1,3,4-oxadiazole derivative as cyclometalated ligand have been reported.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Organometallic Chemistry - Volume 691, Issue 16, 1 August 2006, Pages 3519–3530
نویسندگان
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