کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1494425 | 992909 | 2014 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Four emission bands from a mixed-ligand iridium complex IrQ(ppy)2 at room temperature
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
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چکیده انگلیسی
Four photoluminescence bands are observed from iridium complex in UV, violet, green, and red spectral regions at room temperature. Such a multiple emission is found from a mixed-ligand iridium(III) complex, (8-quinolinolato) bis(2-phenylpyridyl) iridium IrQ(ppy)2, which consists of IrQ and Ir(ppy)2 components (Q: 8-quinolinolato, ppy: phenylpyridyl). Of the four emission bands, the UV emission band with maximum at about 330Â nm and the red emission band are attributed to the ligand-centered (1LC) 1nÏ* and metal-to-ligand charge transfer (3MLCT) 3(ÏÏ*) states from IrQ, respectively, while the violet emission band with maximum at about 400Â nm and the green emission band at about 513Â nm are attributed to the 1LC 1(nÏ*) and 3MLCT 3ÏÏ* states from Ir(ppy). It is suggested that (1) IrQ and Ir(ppy) generate their own emissions by the inefficient Förster energy transfer between IrQ and Ir(ppy) due to the orientation factor of nearly zero, and (2) each of IrQ and Ir(ppy) gives rise to two emissions from the singlet and triplet states by the inefficient intersystem crossing.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 36, Issue 10, August 2014, Pages 1734-1738
Journal: Optical Materials - Volume 36, Issue 10, August 2014, Pages 1734-1738
نویسندگان
Taiju Tsuboi, Duo-Fong Huang, Tahsin J. Chow, Wei Huang,