基于双吡啶并[3,2-a:3',4'-c]吩嗪受体的红色热激活延迟荧光发射体的异构体工程,Journal of Materials Chemistry C

当前位置： X-MOL 学术 › J. Mater. Chem. C › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

基于双吡啶并[3,2-a:3',4'-c]吩嗪受体的红色热激活延迟荧光发射体的异构体工程
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2022-03-21 , DOI: 10.1039/d2tc00017b
Shantaram Kothavale ₁ , Won Jae Chung ₁ , Jun Yeob Lee ₁

Affiliation

为了确定供体取代模式对发射特性的影响，我们设计并合成了两种异构的红色热激活延迟荧光 (TADF) 发射器，即11,12-bis(9,9-dimethylacridin-10(9 H )-yl)双吡啶并[3,2- a :2',3'- c ]吩嗪 ( o DMAC–DPPZ ) 和 10,13-双(9,9-二甲基吖啶-10(9 H )-yl)双吡啶[3,2- a :2',3'- c ]吩嗪 ( p DMAC–DPPZ )。两个 9,9-二甲基-9,10-二氢吖啶 (DMAC) 供体单元连接在联吡啶[3,2- a ] 的邻(11, 12) 和对(10, 13) 位置:2',3'- c ]吩嗪 (DPPZ) 受体，分别获得o DMAC-DPPZ和p DMAC-DPPZ。有趣的是，发射器的光致发光量子产率、外部量子效率和发射波长因 DPPZ 上 DMAC 的取代模式而异。由于与空间应变和二面角相关的结构差异，这两种发射器表现出不同的光物理和有机发光二极管 (OLED) 性能。证明了 DPPZ 上的邻(11, 12) 供体取代在设计高性能红色 TADF OLED 时比对位更有效。（10, 13）根据单重态 - 三重态能隙和上转换速率常数进行替换。邻位取代的TADF 发光体表现出 13.4% 的高 EQE，色坐标为 (0.59, 0.40)，而对位取代异构体的 EQE 为 4.0%，色坐标为 (0.64, 0.35)。

"点击查看英文标题和摘要"

Isomer engineering of dipyrido[3,2-a:3′,4′-c]phenazine-acceptor-based red thermally activated delayed fluorescent emitters

To determine the effect of donor substitution pattern on emission properties, we designed and synthesized two isomeric red thermally activated delayed fluorescent (TADF) emitters, i.e., 11,12-bis(9,9-dimethylacridin-10(9H)-yl)dipyrido[3,2-a:2′,3′-c]phenazine (oDMAC–DPPZ) and 10,13-bis(9,9-dimethylacridin-10(9H)-yl)dipyrido[3,2-a:2′,3′-c]phenazine (pDMAC–DPPZ). Two 9,9-dimethyl-9,10-dihydroacridine (DMAC) donor units were attached at the ortho (11, 12) and para (10, 13) positions of the dipyrido[3,2-a:2′,3′-c]phenazine (DPPZ) acceptor to obtain oDMAC–DPPZ and pDMAC–DPPZ, respectively. Interestingly, the photoluminescence quantum yield, external quantum efficiency, and emission wavelength of the emitters varied depending on the substitution pattern of DMAC on DPPZ. The two emitters exhibited distinct photophysical and organic light-emitting diode (OLED) performances due to structural differences related to steric strain and dihedral angles. It is demonstrated that the ortho (11, 12) donor substitution on DPPZ is more effective in the design of high-performance red TADF OLEDs than the para (10, 13) substitution in terms of singlet–triplet energy gap and up-conversion rate constant. The ortho-substituted TADF emitter demonstrated a high EQE of 13.4% with color coordinates of (0.59, 0.40), whereas the para-substituted isomer displayed an EQE of 4.0% and color coordinates of (0.64, 0.35).

更新日期：2022-03-21

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南