Bui Thanh-Tuân, Goubard Fabrice, Ibrahim-Ouali Malika, Gigmes Didier, Dumur Frédéric
Laboratoire de Physicochimie des Polymères et des Interfaces (LPPI), Université de Cergy-Pontoise, 5 mail Gay Lussac, Neuville sur Oise, 95031 Cergy-Pontoise Cedex, France.
Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, Marseille, France.
Beilstein J Org Chem. 2018 Jan 30;14:282-308. doi: 10.3762/bjoc.14.18. eCollection 2018.
The design of highly emissive and stable blue emitters for organic light emitting diodes (OLEDs) is still a challenge, justifying the intense research activity of the scientific community in this field. Recently, a great deal of interest has been devoted to the elaboration of emitters exhibiting a thermally activated delayed fluorescence (TADF). By a specific molecular design consisting into a minimal overlap between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) due to a spatial separation of the electron-donating and the electron-releasing parts, luminescent materials exhibiting small S-T energy splitting could be obtained, enabling to thermally upconvert the electrons from the triplet to the singlet excited states by reverse intersystem crossing (RISC). By harvesting both singlet and triplet excitons for light emission, OLEDs competing and sometimes overcoming the performance of phosphorescence-based OLEDs could be fabricated, justifying the interest for this new family of materials massively popularized by Chihaya Adachi since 2012. In this review, we proposed to focus on the recent advances in the molecular design of blue TADF emitters for OLEDs during the last few years.
设计用于有机发光二极管（OLED）的高发射率且稳定的蓝色发光体仍是一项挑战，这也说明了科学界在该领域进行大量研究活动的合理性。最近，人们对制备具有热激活延迟荧光（TADF）的发光体投入了极大兴趣。通过一种特定的分子设计，即由于供电子部分和吸电子部分的空间分离，使最高占据分子轨道（HOMO）和最低未占据分子轨道（LUMO）之间的重叠最小，从而能够获得具有小的S-T能量分裂的发光材料，通过反向系间窜越（RISC）将电子从三重态热上转换为单重态激发态。通过同时利用单重态和三重态激子进行发光，可以制造出性能可与磷光基OLED相媲美甚至有时超越其性能的OLED，这也解释了自2012年以来赤矢智也大力推广的这一新材料家族为何备受关注。在这篇综述中，我们建议聚焦于过去几年中用于OLED的蓝色TADF发光体分子设计的最新进展。
