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Undoped highly efficient green and white TADF-OLEDs developed by DMAC-BP: manufacturing available via interface engineering

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Abstract

We report on the development of green and white OLEDs with high efficiency based on Bis(4-(9,9-dimethylacridin-10(9H)-yl) phenyl)methanone (DMAC-BP) manufactured by a facile vacuum evaporation technique via device interfaces engineering. Single, double, and three organic layer undoped OLEDs based on DMAC-BP have been fabricated. Among the developed green devices, the performance of three-layer structured OLEDs is the optimum when mCP (1,3-Bis(carbazol-9-yl)benzene) works as the hole transport layer (HTL) and electron block layer (EBL). The measured maximum external quantum efficiency (EQE), current efficiency (CE), power efficiency (PE), and luminance are 8.1%, 25.9 cd/A, 20.3 lm/W, and 42,230 cd/m2, respectively. Importantly, the OLEDs retain the most of their performance at 1000 cd/m2, and the EQE, CE, and PE are 7.2%, 23.7 cd/A, and 19.1 lm/W, respectively. The achieved high efficiency is attributed to the bipolar transport characteristics of DMAC-BP and the matched bandgap between HTL and emission layer (EML). In addition, WOLEDs with DMAC-BP as green layer are all warm white devices. Among them, the structure of green-red-blue (device W3) demonstrates the best performance with a maximum EQE and brightness of 4.4% and 7525 cd/m2. Our findings will facilitate the great potential applications of undoped TADF emitters, and establish a good foundation for the preparation of high-efficiency and low-cost commercial OLEDs.

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Acknowledgements

This work was supported by the Dedicated Fund of Institute of Microelectronics, Chinese Academy of Sciences under Grant No. E0YR063004 and E0SR023002, and the China Postdoctoral Science Foundation (Grant Number 2017M611735) and the “Thirteenth five year” science and technology research Project of Jilin province department of education (Grant No. JJKH20200420KJ) and the Program for the development of Science and Technology of Jilin province (Grant No. 20180101206JC).

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Authors and Affiliations

  1. College of Information & Technology, Jilin Normal University, Siping, 136000, China

    Xin Jiang, Chuang Xue, Gang Zhang & Wenlong Jiang

  2. Key Laboratory of Functional Materials Physics and Chemistry of Ministry of Education, Jilin Normal University, Siping, 136000, China

    Xin Jiang, Chuang Xue, Gang Zhang & Wenlong Jiang

  3. Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, Beijing, 100029, China

    Huai Lin & Guozhong Xing

  4. University of the Chinese Academy of Sciences, Beijing, 100049, China

    Huai Lin & Guozhong Xing

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  1. Xin Jiang
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Correspondence to Gang Zhang, Wenlong Jiang or Guozhong Xing.

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Jiang, X., Lin, H., Xue, C. et al. Undoped highly efficient green and white TADF-OLEDs developed by DMAC-BP: manufacturing available via interface engineering. J Mater Sci: Mater Electron 31, 19136–19145 (2020). https://doi.org/10.1007/s10854-020-04450-z

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