Citation: Chengjun Wu, Youming Zhang, Jingsheng Miao, Kai Li, Weiguo Zhu, Chuluo Yang. Tetradentate cyclometalated platinum complex enables high-performance near-infrared electroluminescence with excellent device stability[J]. Chinese Chemical Letters, ;2023, 34(2): 107445. doi: 10.1016/j.cclet.2022.04.043 shu

Tetradentate cyclometalated platinum complex enables high-performance near-infrared electroluminescence with excellent device stability

Chengjun Wu ^a ,
Youming Zhang ^{a, b, *,} ,
Jingsheng Miao ^{a, *,} ,
Kai Li ^a ,
Weiguo Zhu ^b ,
Chuluo Yang ^{a, *,}

a.
Shenzhen Key Laboratory of New Information Display and Storage Materials, Guangdong Research Center for Interfacial Engineering of Functional Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518055, China
b.
Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, Changzhou University, Changzhou 213164, China

zhangym@szu.edu.cn

jingshengmiao@szu.edu.cn

clyang@szu.edu.cn

Received Date: 2 March 2022
Revised Date: 26 March 2022
Accepted Date: 18 April 2022
Available Online: 20 April 2022

Figures(4)

Due to the high decay rate of the non-radiative transition of long wavelengths, the molecular design of efficient and stable near-infrared (NIR) electroluminescent materials remains a big challenge. Herein, a new tetradentate cyclometalated platinum(Ⅱ) complex with an N^∧C^∧C^∧N coordinated framework has been developed and used as a dopant for NIR organic light-emitting diodes (OLEDs). The complex exhibited a short-lived (0.5–1.5 μs) metal-to-ligand charge transfer (MLCT) excited state in doped and neat films. The resulting NIR OLEDs (λ_EL = 730 nm) achieved maximum external quantum efficiency (EQE_max) of 5.2% and radiance of 74626 mW sr^-1 m^–2. Of note, the device exhibited excellent stability with operational lifetime of 119 h for LT₉₀. This work demonstrated the great potential of tetradentate platinum(Ⅱ) complexes in the field of NIR OLEDs.
- Near-infrared emitter,
- Phosphorescence,
- Platinum complex,
- OLED,
- Operational lifetime
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