期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 12, 页码 10955-10962出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b16094
关键词
organic light-emitting diodes; tandem structure; interface exciplex; ultrathin emissive layers; current efficiency
资金
- National Natural Science Foundation of China [61575136, 51035008, 51373075]
- National Basic Research Program of China (973 Program) [2015CB932200]
- Collaborative Innovation Center of Suzhou Nano Science and Technology (Nano-CIC)
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Shenzhen Key Laboratory of Organic Optoelectromagnetic Functional Materials of Shenzhen Science and Technology Plan [ZDSYS20140509094114164]
- Shenzhen Science and Technology Research Grant [JCYJ20160510144254604]
- Guangdong Key Research Project [2014B090914003]
- Shenzhen Peacock Plan [KQTD2014062714543296]
- Guangdong Academician Workstation [2013B090400016]
Herein we report a novel design philosophy of tandem OLEDs incorporating a doping-free green phosphorescent bis[2-(2-pyridinyl-N)phenyl-C] (acetylacetonato)iridium(III) (Ir(ppy)(2)(acac)) as an ultrathin emissive layer (UEML) into a novel interface-exciplex-forming structure of 1,1-bis [(di-4-tolylamino)phenyl] cyclohexane (TAPC) and 1,3,5-tri(p-pyrid-3-yl-phenyl)benzene (TmPyPB). Particularly, relatively low working voltage and remarkable efficiency are achieved and the designed tandem OLEDs exhibit a peak current efficiency of 135.74 cd/A (EQE = 36.85%) which is two times higher than 66.2 cd/A (EQE = 17.97%) of the device with a single emitter unit. This might be one of the highest efficiencies of OLEDs applying ultrathin emitters without light extraction. Moreover, with the proposed structure, the color gamut of the displays can be effectively increased from 76% to 82% NTSC if the same red and blue emissions as those in the NTSC are applied. A novel form of harmonious fusion among interface exciplex, UEML, and tandem structure is successfully realized, which sheds light on further development of ideal OLED structure with high efficiency, simplified fabrication, low power consumption, low cost, and improved color gamut, simultaneously.
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