کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7908074 1510759 2018 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Assistant dopant system in solution processed phosphorescent OLEDs and its mechanism reveal
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Assistant dopant system in solution processed phosphorescent OLEDs and its mechanism reveal
چکیده انگلیسی
We have developed an assistant dopant system in phosphorescent OLEDs. The system is consisted of a conventional host material 4,4′-Bis(carbazol-9-yl)biphenyl (CBP), a thermally activated delayed fluorescence (TADF) 2,4,5,6-tetrakis(carbazol-9-yl)-1,3-dicyanobenzene (4CzIPN) and a red phosphor Bis[2-(4-n-hexylphenyl)quinoline](acetylacetonate)iridium(III) (Hex-Ir(phq)2(acac)), it has achieved maximum current efficiency and external quantum efficiency of 21.52 cd/A and 9.22%, respectively. The intrinsic mechanism and energy transfer process in the system have been discussed in detail. Moreover, a satisfactory critical current density J0 of 106.1 mA/cm2 has been obtained when the assistant dopant concentration ascends to a suitable level, which indicated low efficiency roll-off of the device. By investigating the exciton generation mechanism and the transient electroluminescence (EL), the main cause of the improvement has been revealed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 75, January 2018, Pages 513-520
نویسندگان
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