Materials with high triplet energies have attracted great attention for their application in exciplex-based or thermally activated delayed fluorescence-based organic light-emitting diodes. To study the correlation between triplet energy and chemical structure, six compounds with typical donor-acceptor-donor structures were designed, synthesized, and characterized. Through the adjustment of molecular configuration by weakening the strengths of donors and increasing the angles between donors and acceptors, the triplet energies of the materials were gradually increased from 2.5 to 3.0 eV. Three exciplex-based organic light-emitting diodes containing one of the synthesized compounds were fabricated, which exhibited efficient blue, green-yellow, and white thermally activated delayed fluorescence. Blue and green-yellow organic light-emitting diodes exhibited the maximum external quantum efficiencies of 9.1% and 8.3%, respectively. White organic light-emitting diodes showed turn-on voltage of 4.8 V, high maximum luminance of 18474 cdm^-2, and maximum external quantum efficiency of 10.6%. Maximum external quantum efficiencies of blue and white organic light-emitting diodes were close to the record values observed for all-exciplex-based blue and white organic light-emitting diodes.

具有高三重态能量的材料因其在基于激基复合物或热活化延迟荧光的有机发光二极管中的应用而引起了极大的关注。为了研究三重态能量与化学结构之间的关系，设计，合成和表征了六种具有典型供体-受体-供体结构的化合物。通过弱化施主的强度并增加施主与受主之间的角度来调节分子构型，材料的三重态能量从2.5 eV逐渐增加到3.0 eV。制备了三个包含复合化合物之一的基于激基复合物的有机发光二极管，它们显示出有效的蓝色，绿色-黄色和白色热激活延迟荧光。蓝色和绿色黄色有机发光二极管的最大外部量子效率分别为9.1％和8.3％。白色有机发光二极管的开启电压为4.8 V，最高亮度为18474 cdm^-2，最大外部量子效率为10.6％。蓝色和白色有机发光二极管的最大外部量子效率接近基于全激基的蓝色和白色有机发光二极管的记录值。