Yuan Wenbo, Huang Tianyu, Zhou Jianping, Tang Man-Chung, Zhang Dongdong, Duan Lian
Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Department of Chemistry, Tsinghua University, Beijing, 100084, China.
Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China.
Nat Commun. 2025 May 13;16(1):4446. doi: 10.1038/s41467-025-59583-8.
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/m 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.
合适的主体材料对于高效稳定的深蓝色磷光有机发光二极管（PhOLED）至关重要。在此，我们构建了一种具有改善的分子稳定性和电荷传输性能的氘代激基复合物形成主体，并首次揭示了对掺杂剂的“外部氘化效应”，该效应减少了略微蓝移颜色的肩部发射，还加速了辐射衰减速率以提高光致发光效率。基于两种铂配合物PtON-TBBI和PtON-tb-DTB的相应深蓝色PhOLED，与基于氢的同类产品相比，分别实现了更低的工作电压以及更高的最大外量子效率，分别为27.4/19.9%和功率效率为41.2/33.6 lm/W。此外，在国际照明委员会坐标为(0.148, 0.165)和(0.153, 0.213)的情况下，达到初始亮度1000 cd/m²的90%的寿命分别为370和557小时，比基于非氘代主体且颜色更蓝移的同类产品长1.6倍和1.4倍。
