Phosphorescent iridium (III) complexes are considered as competitive candidates for fabricating efficient and stable display and illumination devices by the virtue of excellent exciton utilization. Nevertheless, the high-efficiency phosphorescent emitters available for solution-processed fabrication, are still deemed unsatisfactory for the mainstream industries. In this context, a valid strategy of linking thermally activated delayed fluorescence (TADF) group covalently to phosphorescent iridium (III) complexes was proposed, in which TADF groups function as light-harvesting entities. In this way, the TADF units within the prepared complex TriTADF-Ir(dFppy)₃, can effectively transfer energy to the phosphor core and thus boost device performances and reduce efficiency roll-off via alleviating the triplet exciton annihilations. As a result, the photoluminescence quantum yield of TriTADF-Ir(dFppy)₃ blend films can reach to nearly 73%. Thanks to the peripheral TADF dendrons, flexible TriTADF-Ir(dFppy)₃ can be employed in fabricating solution-processed phosphorescent organic light-emitting diodes (PhOLEDs) with greenish-blue emission, which achieve external quantum efficiency value over 20% and maintaining around 16% at 1000 cd/m². Overall, this result manifests that the effective utilization of triplet excitons and consequently enhanced device performance of solution-processed PhOLEDs can be accomplished by utilizing TADF molecules as peripheral light-harvesting moieties to construct dendritic phosphorescent emitters.

磷光铱 (III) 配合物凭借出色的激子利用被认为是制造高效稳定的显示和照明设备的竞争候选者。尽管如此，可用于溶液加工制造的高效磷光发射器仍被认为不能满足主流行业的要求。在此背景下，提出了一种将热激活延迟荧光 (TADF) 基团与磷光铱 (III) 配合物共价连接的有效策略，其中 TADF 基团起到光捕获实体的作用。这样，制备的复杂 TriTADF-Ir(dFppy) _{3中的 TADF 单元}，可以有效地将能量转移到荧光粉核心，从而通过减轻三重态激子湮灭来提高器件性能并降低效率滚降。因此，TriTADF-Ir(dFppy) ₃共混薄膜的光致发光量子产率可以达到近73%。得益于周边的 TADF 树突，柔性 TriTADF-Ir(dFppy) ₃可用于制造溶液处理的绿蓝光磷光有机发光二极管 (PhOLED)，实现超过 20% 的外部量子效率值并保持在大约1000 cd/m ^{2时为 16%}. 总的来说，这一结果表明，通过利用 TADF 分子作为外围光捕获部分来构建树枝状磷光发射体，可以有效利用三重态激子，从而提高溶液处理的 PhOLED 的器件性能。