The electrical, thermal, and optical properties of the host material used in the light-emitting layer of a thermally activated delayed fluorescence organic light-emitting diode (TADF-OLED) directly affect its efficiency, lifetime, and color. In this study, a new host material was designed, synthesized, and then applied to a green TADF-OLED device to evaluate its performance as a host. The host material was designed in a bipolar configuration, ensuring the balanced introduction and transport of electrons and holes. This balance was achieved by incorporating a carbazole unit to facilitate hole injection and transport. Moreover, a 5,9-dioxa-13b-boranaphtho [3,2,1-de]anthracene (DOBNA) unit containing a boron atom was introduced for electron injection and transport. These units were linked to ortho terphenyl spacers. The DOBNA unit improved the electron transport properties, the thermal stability of molecule, and anionic bond dissociation energy. Consequently, the device evaluated using the DOBNA-introduced material as a host for 4CzIPN, a TADF dopant, enhanced the performance by ∼ four times from LT₈₀@1000 nit to 15.1 h compared to the unipolar host material comprising carbazole and ortho-terphenyl.

热激活延迟荧光有机发光二极管（TADF-OLED）发光层中使用的主体材料的电学、热学和光学特性直接影响其效率、寿命和颜色。在这项研究中，设计、合成了一种新的主​​体材料，然后将其应用于绿色TADF-OLED器件，以评估其作为主体的性能。主体材料采用双极结构设计，确保电子和空穴的平衡引入和传输。这种平衡是通过合并咔唑单元以促进空穴注入和传输来实现的。此外，引入含有硼原子的5,9-二氧杂-13b-硼萘并[3,2,1-去]蒽（DOBNA）单元用于电子注入和传输。这些单元与邻三联苯间隔基连接。DOBNA单元提高了电子传输性能、分子的热稳定性和阴离子键解离能。因此，使用 DOBNA 引入的材料作为 4CzIPN（一种 TADF 掺杂剂）的主体进行评估的器件，与包含咔唑和邻三联苯的单极主体材料相比，性能提高了约四倍，从 LT ₈₀ @1000 nit 提高到 15.1 h 。