High-efficiency and long-lifetime deep-blue phosphorescent OLEDs using deuterated exciplex-forming host

Wenbo Yuan, Tianyu Huang, Jianping Zhou, Man-Chung Tang, Dongdong Zhang () and Lian Duan ()
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Wenbo Yuan: Department of Chemistry, Department of Chemistry, Tsinghua University
Tianyu Huang: Department of Chemistry, Department of Chemistry, Tsinghua University
Jianping Zhou: Department of Chemistry, Department of Chemistry, Tsinghua University
Man-Chung Tang: Tsinghua University
Dongdong Zhang: Department of Chemistry, Department of Chemistry, Tsinghua University
Lian Duan: Department of Chemistry, Department of Chemistry, Tsinghua University

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract A suitable host material is pivotal for efficient and stable deep-blue phosphorescent organic light-emitting diodes (PhOLEDs). Here, we construct a deuterated exciplex-forming host with improved molecular stability and charge transport and firstly unveil an “external deuteration effect” on dopant, which reduces the shoulder emissions for slightly blue-shifted colours and also accelerates the radiative decay rates for improved photoluminescence efficiency. The corresponding deep-blue PhOLEDs based on two platinum complexes, PtON-TBBI and PtON-tb-DTB, achieve lower operational voltages and higher maximum external quantum efficiencies of 27.4/19.9% and power efficiency of 41.2/33.6 lm/W, respectively, compared to the hydrogen-based counterparts. Moreover, lifetimes of 370 and 557 h to reach 90% of the initial luminance of 1000 cd/m2 with Commission Internationale de l’Eclairage coordinates of (0.148, 0.165) and (0.153, 0.213) are achieved, 1.6 and 1.4 times longer than the ones based on the non-deuterated hosts with even blue-shifted colours.

Date: 2025
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DOI: 10.1038/s41467-025-59583-8

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