Citation: Shen Yue, Tang Xiaohui, Xu Yuwei, Liu Haichao, Zhang Shitong, Yang Bing, Ma Yuguang. Enhanced deep-red emission in donor-acceptor molecular architecture: The role of ancillary acceptor of cyanophenyl[J]. Chinese Chemical Letters, ;2019, 30(11): 1947-1950. doi: 10.1016/j.cclet.2019.07.059 shu

Enhanced deep-red emission in donor-acceptor molecular architecture: The role of ancillary acceptor of cyanophenyl

Shen Yue ^a,1 ,
Tang Xiaohui ^a,1 ,
Xu Yuwei ^b,1 ,
Liu Haichao ^a,*, ,
Zhang Shitong ^a ,
Yang Bing ^a,*, ,
Ma Yuguang ^b

a.
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, China
b.
State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China

hcliu@jlu.edu.cn

yangbing@jlu.edu.cn

Received Date: 25 June 2019
Revised Date: 17 July 2019
Accepted Date: 27 July 2019
Available Online: 1 December 2019

Figures(4)

Organic solid-state luminescent materials with high-efficiency deep-red emission have attracted considerable interest in recent years. Constructing donor-acceptor (D-A) type molecules has been one of most commonly used strategies to achieve deep-red emission, but it is always difficult to achieve high photoluminescence (PL) quantum yield (η_PL) due to forbidden charge-transfer state. Herein, we report a new D-A type molecule 4-(7-(4-(diphenylamino)phenyl)-9-oxo-9H-fluoren-2-yl)benzonitrile (TPAFOCN), deriving from donor-acceptor-donor (D-A-D) type 2, 7-bis(4-(diphenylamino)phenyl)-9H-fluoren-9-one (DTPA-FO) with a fluorescence maximum of 627 nm in solids. This molecular design enables a transformation of acceptor from fluorenone (FO) itself to 4-(9-oxo-9H-fluoren-2-yl) benzonitrile (FOCN). Compared with DTPA-FO, the introduction of cyanophenyl not only shifts the emission of TPA-FOCN to deep red with a fluorescence maximum of 668 nm in solids, but also maintains the high η_PL of 10%. Additionally, a solution-processed non-doped organic light-emitting diode (OLED) was fabricated with TPA-FOCN as emitter. TPA-FOCN device showed a maximum luminous efficiency of 0.13 cd/A and a maximum external quantum efficiency (EQE) of 0.22% with CIE coordinates of (0.64, 0.35). This work provides a valuable strategy for the rational design of high-efficiency deep-red emission materials using cyanophenyl as an ancillary acceptor.
- Deep-red emission,
- Fluorenone,
- Cyanophenyl group,
- Donor-acceptor,
- Organic light-emitting diodes
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沈阳化工大学材料科学与工程学院沈阳 110142