Enhanced Pi Conjugation and Donor/Acceptor Interactions in D-A-D Type Emitter for Highly Efficient Near-Infrared Organic Light-Emitting Diodes with an Emission Peak at 840 nm

被引：80

作者：

Jiang, Jianxia ^{[1
]}

Xu, Zeng ^{[1
]}

Zhou, Jiadong ^{[1
]}

Hanif, Muddasir ^{[1
]}

Jiang, Qinglin ^{[1
]}

Hu, Dehua ^{[1
]}

Zhao, Ruiyang ^{[2
]}

Wang, Cong ^{[1
]}

Liu, Linlin ^{[1
]}

Ma, Dongge ^{[1
]}

Ma, Yuguang ^{[1
]}

Cao, Yong ^{[1
]}

机构：

[1] South China Univ Technol, State Key Lab Luminescent Mat & Devices, Inst Polymer Optoelect Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China

[2] Qingdao Univ Sci & Technol, Coll Chem Engn, Qingdao 266042, Shandong, Peoples R China

来源：

CHEMISTRY OF MATERIALS | 2019年 / 31卷 / 17期

关键词：

INTRAMOLECULAR CHARGE-TRANSFER; ENERGY-GAP LAW; DELAYED FLUORESCENCE; POLYMER; CHROMOPHORES; STATES; OLEDS; FILMS;

D O I：

10.1021/acs.chemmater.8b04894

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Restricted by the energy gap rule, near-infrared (NIR) luminescent materials face great challenges. Here, we report a newly designed and synthesized organic molecule, 5,5'-([1,2,5]thiadiazolo[3,4-c]pyridine-4,7-diyl)bis(N,N-diphenylthiophen-2-amine) (DTPS-PT), which has strong donor and acceptor interactions for NIR emission applications. The results demonstrate that the higher planarity of the DTPS-PT molecular structure enhances the pi-conjugation and hybridization between the charge transfer state (CT) and localized pi states (LE). As a result, DTPS-PT exhibits NIR emissions from an LE involved in hybridized local and charge transfer (HLCT) states, showing a 79% high fluorescence quantum yield in the low polar solvent tetrachloromethane. For both doped and nondoped devices, the NIR OLEDs based on DTPS-PT achieved "real" NIR emission with the lambda(onset) above 700 nm. The best performing OLED device within the doped devices gave a maximum emission peak around 840 nm with a maximum radiance of 2202 mW Sr-1 m(-2).

引用

页码：6499 / 6505

页数：7

共 42 条

[21] Boosting the Efficiency of Near-Infrared Fluorescent OLEDs with an Electroluminescent Peak of Nearly 800 nm by Sensitizer-Based Cascade Energy Transfer [J].