کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5403384 | 1392758 | 2007 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Change of the dominant luminescent mechanism with increasing current density in molecularly doped organic light-emitting devices
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Change of the dominant luminescent mechanism with increasing current density in molecularly doped organic light-emitting devices Change of the dominant luminescent mechanism with increasing current density in molecularly doped organic light-emitting devices](/preview/png/5403384.png)
چکیده انگلیسی
We have fabricated and measured a series of electroluminescent devices with the structure of ITO/TPD/Eu(TTA)3phen (x):CBP/BCP/ALQ/LiF/Al, where x is the weight percentage of Eu(TTA)3phen (from 0% to 6%). At very low current density, carrier trapping is the dominant luminescent mechanism and the 4% doped device shows the highest electroluminescence (EL) efficiency among all these devices. With increasing current density, Förster energy transfer participates in EL process. At the current density of 10.0 and 80.0Â mA/cm2, 2% and 3% doped devices show the highest EL efficiency, respectively. From analysis of the EL spectra and the EL efficiency-current density characteristics, we found that the EL efficiency is manipulated by Förster energy transfer efficiency at high current density. So we suggest that the dominant luminescent mechanism changes gradually from carrier trapping to Förster energy transfer with increasing current density. Moreover, the conversion of dominant EL mechanism was suspected to be partly responsible for the EL efficiency roll-off because of the lower EL quantum efficiency of Förster energy transfer compared with carrier trapping.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 126, Issue 2, October 2007, Pages 644-652
Journal: Journal of Luminescence - Volume 126, Issue 2, October 2007, Pages 644-652
نویسندگان
Liang Zhou, Hongjie Zhang, Qingguo Meng, Fengyi Liu, Jiangbo Yu, Ruiping Deng, Zeping Peng, Zhefeng Li, Zhiyong Guo,