Efficient CuInS2/ZnS based quantum dot light emitting diodes by engineering the exciton formation interface

This study shows that the efficiency of quantum dot light emitting diodes (QLEDs) can be significantly increased by adding an additional layer of 1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene (TPBi, 3 nm) between the CuInS2/ZnS emission layer and the 4,4-N,N-dicarbazole-biphenyl (CBP) hole transport layer (HTL). The intermediate TPBi layer serves to reduce quenching of quantum dot (QD) emission and prevents leakage between the other layers. The Nanosurf CoreAFM was used to determine the thickness of each individual layer. The efficiency increases with the thickness, whereas the luminescence drops, explained by changes in the electron carrier distribution in the QD layers.

Journal of Luminescence Volume 202, October 2018, Pages 339-344

Xia Huangad, Rongmei Yuc, Xingqiang Yangc, Xiumei Xuc, Han Zhangd, Dandan Zhangbe

Thickness of layers in improved QLEDs measured with CoreAFM

This study shows that the efficiency of quantum dot light emitting diodes (QLEDs) can be significantly increased by adding an additional layer of 1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene (TPBi, 3 nm) between the CuInS2/ZnS emission layer and the 4,4-N,N-dicarbazole-biphenyl (CBP) hole transport layer (HTL). The intermediate TPBi layer serves to reduce quenching of quantum dot (QD) emission and prevents leakage between the other layers. The Nanosurf CoreAFM was used to determine the thickness of each individual layer. The efficiency increases with the thickness, whereas the luminescence drops, explained by changes in the electron carrier distribution in the QD layers.

Efficient CuInS2/ZnS based quantum dot light emitting diodes by engineering the exciton formation interface

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Flex-Axiom — AFM for materials research

By advancing key technologies and designs, Nanosurf has made the Flex-Axiom one of the most versatile and flexible atomic force microscopes ever, allowing a large variety of materials research applications to be handled with ease. Together with the powerful C3000 controller, complex material characterizations are possible.

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Flex-Bio — AFM for biology and life science

A key success factor in life science research is the combination of multiple techniques. With the Flex-Bio, Nanosurf's Bio AFM, you can combine the AFM imaging, spectroscopy and nanomanipulation capabilities of this system with the high-end optical imaging techniques available for inverted microscopes.