Achieving deep red to near-infrared electroluminescence in platinum complex through enhanced conjugation of the ligand

IF 2.1 3区化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR

Journal of Organometallic Chemistry Pub Date : 2025-03-08 DOI:10.1016/j.jorganchem.2025.123613

Cheng Zhang , Jialu Liu , Danfeng He , Keyue Xu , Yuanyuan Fang , Wei Sun , Wenjing Xiong

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Abstract

Three mononuclear platinum (II) complexes piqPtOXD, 2niqPtOXD and PyriqPtOXD were synthesized using phenyl isoquinoline, naphthalene isoquinoline and pyrene isoquinoline as cyclometalated ligands and 1,3,4-oxadiazole derivatives as auxiliary ligands. The photophysical, electrochemical and electroluminescent properties were primarily investigated. It's observed that an increase in the rigid planar structure of the ligand cyclic aromatic hydrocarbons resulted in higher thermal stability, lower band gap values and red-shifted emission spectra. Theoretical calculations indicated that the decrease in the energy gap value of the complex PyriqPtOXD was due to the distribution of both the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy level on the platinum atoms and cyclometalated ligands. In addition, the electroluminescence (EL) peak of the devices based on PyriqPtOXD reached 742 nm, which was 140 nm red-shifted compared to the piqPtOXD-based devices, with a maximum irradiance of 36 μW/cm² and a maximum external quantum efficiency (EQE_max) of 0.35 %.

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来源期刊

Journal of Organometallic Chemistry 化学-无机化学与核化学

CiteScore

4.40

自引率

8.70%

发文量

221

审稿时长

36 days

期刊介绍： The Journal of Organometallic Chemistry targets original papers dealing with theoretical aspects, structural chemistry, synthesis, physical and chemical properties (including reaction mechanisms), and practical applications of organometallic compounds. Organometallic compounds are defined as compounds that contain metal - carbon bonds. The term metal includes all alkali and alkaline earth metals, all transition metals and the lanthanides and actinides in the Periodic Table. Metalloids including the elements in Group 13 and the heavier members of the Groups 14 - 16 are also included. The term chemistry includes syntheses, characterizations and reaction chemistry of all such compounds. Research reports based on use of organometallic complexes in bioorganometallic chemistry, medicine, material sciences, homogeneous catalysis and energy conversion are also welcome. The scope of the journal has been enlarged to encompass important research on organometallic complexes in bioorganometallic chemistry and material sciences, and of heavier main group elements in organometallic chemistry. The journal also publishes review articles, short communications and notes.