Solution-processed organometallic quasi-two-dimensional nanosheets as a hole buffer layer for organic light-emitting devices

Shihao Liu, Ying Chiao Wang, Chi Ming Chang, Takeshi Yasuda, Naoya Fukui, Hiroaki Maeda, Peihua Long, Kazuo Nakazato, Wen Bin Jian, Wenfa Xie, Kazuhito Tsukagoshi, Hiroshi Nishihara

Research output: Contribution to journalArticlepeer-review

Abstract

Two-dimensional (2D) vdW materials have been integrated into optoelectronic devices to achieve exceptional functionality. However, the integration of large-area 2D thin films into organic light-emitting devices (OLEDs) remains challenging because of the finite number of inorganic 2D materials and the high-temperature requirements of their deposition process. The construction of 2D organometallic materials holds immense potential because of their solution synthesis and unlimited structural and functional diversity. Here, we report a facile route using an oil-water interfacial coordination reaction between organic ligands and divalent metal ions to synthesize crystalline quasi-2D organometallic bis(dithiolato)nickel (NiDT) nanosheets with a centimeter scale and a tunable thickness. The NiDT nanosheets can be directly integrated into OLEDs for use as a hole buffer layer and a fluorescent mounting medium without the aid of a transfer process. Moreover, OLEDs with NiDT nanosheets show not only comparable efficiency to conventional OLEDs but also prolonged device lifetime by nearly 2 times. These results open up a new dimension to use quasi-2D organometallic nanosheets as functional layers in large-area organic devices.

Original languageEnglish
Pages (from-to)6983-6990
Number of pages8
JournalNanoscale
Volume12
Issue number13
DOIs
Publication statusPublished - 2020 Apr 7

ASJC Scopus subject areas

  • Materials Science(all)

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