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A silane-based host material with improved electron transport properties for phosphorescent OLEDs with high efficiency and low efficiency roll-off

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Abstract

A dibenzosilole-based host material was designed and characterized. The host material, 9,9′-(5,5-diphenyl-5H-dibenzo[b, d]silole-2,8-diyl)bis(9H-carbazole) (S-SiCz), was designed to enhance the electron transport properties and rigidity by coupling two phenyl units of the tetraphenyl silane of a strong hole transport type bis(4-(9H-carbazol-9-yl)phenyl)diphenylsilane host. The device efficiency roll-off was improved considerably by balancing the carriers in the phosphorescent organic light-emitting diodes (PhOLEDs), and the driving voltage at high luminance was reduced. The red and green PhOLEDs exhibited high external quantum efficiencies (EQEs) of 23.8% and 24.9%, respectively, and a relieved efficiency roll-off. In addition, S-SiCz was used as an electron transport type host with a hole transport type 3,3′-di(9H-carbazol-9-yl)-1,1′-biphenyl host. The maximum EQEs of the red and green PhOLEDs using the mixed host were 26.0% and 25.5%, respectively, and EQE roll-off values were 18% and 6%, respectively. Therefore, the planarization design strategy of the host is effective for better device performance.

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Acknowledgements

This work was supported by the National Science Foundation of Korea (2020R1A2C2100872), and the Ministry of Trade, Industry and Energy of Korea (20018956).

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Authors and Affiliations

  1. School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, 16419, Republic of Korea

    Jinho Park, Junseop Lim & Jun Yeob Lee

Authors
  1. Jinho Park
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  2. Junseop Lim
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  3. Jun Yeob Lee
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Contributions

Lee JY and Park J designed, synthesized and analyzed the S-SiCz host used in this study. Lim J fabricated the devices. The manuscript was prepared by Park J and Lee JY. All authors reviewed and approved the final manuscript.

Corresponding author

Correspondence to Jun Yeob Lee.

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Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary information

Experimental details and supporting data are available in the online version of the paper.

Jinho Park received his Master’s degree from the Department of Chemistry of Sungkyunkwan University, Korea in 2020. He is now a PhD candidate at the School of Chemical Engineering, Sungkyunkwan University. His main research areas are the design, synthesis, and optoelectronic characterization of host materials for high efficiency and long device lifetime in blue phosphorescent organic light-emitting diodes, and novel blue thermally activated delayed fluorescence (TADF) emitters with narrow emission.

Jun Yeob Lee received his PhD degree from Seoul National University, Korea in 1998. After postdoc at Rensselaer Polytechnic Institute (1998–1999), he joined Samsung SDI and developed active matrix organic light emitting diode for six years. After that, he worked as a professor at the Department of Polymer Science and Engineering, Dankook University, and he has been a professor at the School of Chemical Engineering, Sungkyunkwan University since 2015. His main research areas are the synthesis of organic electronic materials and development of novel device structure for organic electronic devices.

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A silane-based host material with improved electron transport properties for phosphorescent OLEDs with high efficiency and low efficiency roll-off

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Park, J., Lim, J. & Lee, J.Y. A silane-based host material with improved electron transport properties for phosphorescent OLEDs with high efficiency and low efficiency roll-off. Sci. China Mater. 66, 1997–2003 (2023). https://doi.org/10.1007/s40843-022-2342-x

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