کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1327318 977475 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of ancillary ligands on the properties of heteroleptic green iridium dendrimers functionalized with carbazole dendrons
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Effect of ancillary ligands on the properties of heteroleptic green iridium dendrimers functionalized with carbazole dendrons
چکیده انگلیسی

A series of heteroleptic green iridium dendrimers functionalized with carbazole dendrons, such as G2(pic) and G2(acac), have been synthesized, in which picolinic acid and acetylacetone are used as the ancillary ligands, respectively. Compared with the corresponding homoleptic iridium dendrimer G2 (8%), these heteroleptic ones can be prepared under mild conditions with total yields as high as 55–67%. Both the dendrimer G2(pic) and G2(acac) display bright green emissions with photoluminescence quantum yields higher than 0.80 in toluene solution. As a result, a maximum external quantum efficiency of 7.1% (21.0 cd/A) for G2(pic) and 7.7% (25.8 cd/A) for G2(acac) has been realized based on non-doped device configuration. The state-of-art performance indicates that the heteroleptic dendrimers can be promising candidates used for non-doped electrophosphorescent devices, especially when the ease of synthesis in a large scale is considered.

The heteroleptic iridium dendrimer G2(acac) can be conveniently synthesized with a total yield as high as 67% and the efficiency of its non-doped electrophosphorescent device reaches to 25.8 cd/A (7.7%).Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Organometallic Chemistry - Volume 694, Issue 17, 1 August 2009, Pages 2700–2704
نویسندگان
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