Efficient Triplet Application in Exciplex Delayed-Fluorescence OLEDs Using a Reverse Intersystem Crossing Mechanism Based on a Delta ES-T of around Zero

	Efficient Triplet Application in Exciplex Delayed-Fluorescence OLEDs Using a Reverse Intersystem Crossing Mechanism Based on a Delta ES-T of around Zero
	Zhang T. Y.; Chu B.; Li W. L.; Su Z. S.; Peng Q. M.; Zhao B.; Luo Y. S.; Jin F. M.; Yan X. W.; Gao Y.; Wu H. R.; Zhang F.; Fan D.; Wang J. B.
	2014
发表期刊	Acs Applied Materials & Interfaces
ISSN	ISBN/1944-8244
卷号	6 期号:15 页码:11907-11914
摘要	We demonstrate highly efficient exciplex delayed-fluorescence organic light-emitting diodes (OLEDs) in which 4,4',4 ''-tris[3-methylphenyl(phenyl)-aminotriphenylamine (m-MTDATA) and 4,7-diphenyl-1,10-phenanthroline (Bphen) were selected as donor and acceptor components, respectively. Our m-MTDATA:Bphen exciplex electroluminescence (EL) mechanism is based on reverse intersystem crossing (RISC) from the triplet to singlet excited states. As a result, an external quantum efficiency (EQE) of 7.79% at 10 mA/cm(2) was observed, which increases by 3.2 and 1.5 times over that reported in Nat. Photonics 2012, 6, 253 and Appl. Phys. Lett. 2012, 101, 023306, respectively. The high EQE would be attributed to a very easy RISC process because the energy difference between the singlet and triplet excited states is almost around zero. The verdict was proven by photoluminescence (PL) rate analysis at different temperatures and time-resolved spectral analysis. Besides, the study of the transient PL process indicates that the presence of an unbalanced charge in exciplex EL devices is responsible for the low EQE and high-efficiency roll-off. When the exciplex devices were placed in a 100 mT magnetic field, the permanently positive magnetoelectroluminescence and magnetoconductivity were observed. The magnetic properties confirm that the efficient exciplex EL only originates from delayed fluorescence via RISC processes but is not related to the triplet-triplet annihilation process.
收录类别	SCI ; EI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/43951
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Zhang T. Y.,Chu B.,Li W. L.,et al. Efficient Triplet Application in Exciplex Delayed-Fluorescence OLEDs Using a Reverse Intersystem Crossing Mechanism Based on a Delta ES-T of around Zero[J]. Acs Applied Materials & Interfaces,2014,6(15):11907-11914.
APA	Zhang T. Y..,Chu B..,Li W. L..,Su Z. S..,Peng Q. M..,...&Wang J. B..(2014).Efficient Triplet Application in Exciplex Delayed-Fluorescence OLEDs Using a Reverse Intersystem Crossing Mechanism Based on a Delta ES-T of around Zero.Acs Applied Materials & Interfaces,6(15),11907-11914.
MLA	Zhang T. Y.,et al."Efficient Triplet Application in Exciplex Delayed-Fluorescence OLEDs Using a Reverse Intersystem Crossing Mechanism Based on a Delta ES-T of around Zero".Acs Applied Materials & Interfaces 6.15(2014):11907-11914.

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