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

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 th...

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Bibliographic Details
Published in:Nanoscale 2020-04, Vol.12 (13), p.6983-699
Main Authors: Liu, Shihao, Wang, Ying-Chiao, Chang, Chi-Ming, Yasuda, Takeshi, Fukui, Naoya, Maeda, Hiroaki, Long, Peihua, Nakazato, Kazuo, Jian, Wen-Bin, Xie, Wenfa, Tsukagoshi, Kazuhito, Nishihara, Hiroshi
Format: Article
Language:English
Subjects:
Buffer layers
Chemical synthesis
Electronic devices
Fluorescence
High temperature
Nanosheets
Optoelectronic devices
Organic light emitting diodes
Service life assessment
Thickness
Thin films
Two dimensional materials
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Summary: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. Quasi-2D organometallic bis(dithiolato)nickel nanosheets are successfully integrated into organic light-emitting devices to achieve extended device lifetime.
ISSN:2040-3364
2040-3372
DOI:10.1039/d0nr00240b