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Synthesis and Characterization of Luminescent Cyclometalated Platinum(II) Complexes with Tunable Emissive Colors and Studies of Their Application in Organic Memories and Organic Light-Emitting Devices

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journal contribution
posted on 31.07.2017, 12:48 by Alan Kwun-Wa Chan, Maggie Ng, Yi-Chun Wong, Mei-Yee Chan, Wing-Tak Wong, Vivian Wing-Wah Yam
A series of luminescent cyclo­metalated N^C^N [N^C^N = 1,3-bis­(N-alkyl­benz­imid­azol-2′-yl)­benzene]­platinum­(II) alkynyl and carb­azolyl complexes has been prepared. The structure of one platinum­(II) carb­azolyl complex has been characterized by X-ray crystallography. The corresponding electro­chemical and photo­physical properties have been explored and analyzed. The N^C^N platinum­(II) complexes displayed rich luminescence in degassed dichloro­methane solution, with their emission profiles dependent on the coordinated alkynyl and carb­azolyl ligands. Their emission energies are correlated to the electronic properties of the alkynyl and carb­azolyl ligands. By varying the electronic properties of the alkynyl and carb­azolyl ligands, emission energies could be fine-tuned to cover a wide range of the visible spectrum, as supported by computational studies. A donor–acceptor platinum­(II) complex has been utilized to fabricate memory devices that exhibit binary memory performances with low operating voltages, high ON/​OFF ratios, and long retention times. Solution-processable OLEDs have been fabricated based on another platinum­(II) carb­azolyl complex, resulting in a maximum external quantum efficiency of up to 7.2%, which is comparable to that of the vacuum-deposited devices based on the small-molecule counterpart, illustrating the multifunctional nature of the platinum­(II)-containing materials.