题目：

Highly Simplified Tandem Organic Light-Emitting Devices Incorporating a Green Phosphorescence Ultrathin Emitter within a Novel Interface Exciplex for High Efficiency

作者：

Ting Xu,^†,‡ Jun-Gui Zhou,^† Chen-Chao Huang,^† Lei Zhang,^† Man-Keung Fung,^† Imran Murtaza,^§,∥ Hong Meng,^*,‡,§ and Liang-Sheng Liao^*,†

单位：

^†Institute of Functional Nano & Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nanoscience and Technology, Soochow University, 199 Ren-Ai Road, Suzhou 215123, China.

^‡School of Advanced Materials, Shenzhen Graduate School, Peking University, Shenzhen 518055, China

^§ Key Laboratory of Flexible Electronics and Institute of Advanced Materials, Jiangsu National Synergistic Innovation Centre for Advanced Materials, Nanjing Tech University, Nanjing 211816, China

^∥Department of Physics, International Islamic University, Islamabad 44000, Pakistan

摘要：

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.

影响因子：

7.504

分区情况：

一区

链接：

http://pubs.acs.org/doi/abs/10.1021/acsami.6b16094