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

查看全文 作　　者：Chengjun [1]Wu;Youming [1,2]Zhang;Jingsheng [1]Miao;Kai [1]Li;Weiguo [2]Zhu;Chuluo [1]Yang 高影响力作者 机构地区：[1]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;[2]Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications,Changzhou University,Changzhou 213164,China高影响力机构 出　　处：《Chinese Chemical Letters》索引2023年第34卷第2期,共4页高影响力期刊 基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51903157 and 52130308);the Shenzhen Science and Technology Program (Nos. KQTD20170330110107046 and ZDSYS20210623091813040);the School of Materials Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications (No. GDRGCS2021001)。 摘　　要：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 m W sr^(-1)m^(–2). Of note, the device exhibited excellent stability with operational lifetime of 119 h for LT_(90). This work demonstrated the great potential of tetradentate platinum(II)complexes in the field of NIR OLEDs. 关 键 词：Near-infrared emitter PHOSPHORESCENCE Platinum complex OLED Operational lifetime
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