کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6600404 | 458925 | 2015 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Efficiency phosphorescent OLEDs with a low roll-off based on a hetero-triplet iridium complex
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In order to explore the triplet-triplet annihilation in cyclometalated iridium complexes, a hetero-triplet iridium complex [Ir(ppy)2pbi] employing two 2-phenylpyridine (Hppy) ligands and one 1,2-diphenyl-1H-benzo[d]-imidazole (Hpbi) ligand with similar triplet energies was synthesized. A device based on Ir(ppy)2pbi exhibited high current efficiency 26.7Â cd/A at high doping concentration 12Â wt%. More interestingly, the current efficiency was still maintained at 25.8Â cd/A when the current density was above 253.2Â mA/cm2. The efficiency roll-off was only about 3.4%, much lower than that of traditional cyclometalated iridium complexes. It is proposed that the complicated energy level and unsymmetical ligand in Ir(ppy)2pbi may help to suppress the triplet-triplet annihilation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Dyes and Pigments - Volume 113, February 2015, Pages 649-654
Journal: Dyes and Pigments - Volume 113, February 2015, Pages 649-654
نویسندگان
Liangliang Han, Dongyu Zhang, Jun Wang, Zhenggang Lan, Renqiang Yang,