Issue 12, 2016

Solid state carbon nanotube device for controllable trion electroluminescence emission

Abstract

Semiconducting carbon nanotubes (CNTs) have a direct chirality-dependent bandgap and reduced dimensionality-related quantum confinement effects, which are closely related to the performance of optoelectronic devices. Here, taking advantage of the large energy separations between neutral singlet excitons and charged excitons, i.e. trions in CNTs, we have achieved for the first time all trion electroluminescence (EL) emission from chirality-sorted (8,3) and (8,4) CNT-based solid state devices. We showed that strong trion emission can be obtained as a result of localized impact excitation and electrically injected holes, with an estimated efficiency of ∼5 × 10−4 photons per injected hole. The importance of contact-controlled carrier injection (including symmetric and asymmetric contact configurations) and EL spectral stability for gradually increasing bias were also investigated. The realization of electrically induced pure trion emission opens up a new opportunity for CNT film-based optoelectronic devices, providing a new degree of freedom in controlling the devices to extend potential applications in spin or magnetic optoelectronics fields.

Graphical abstract: Solid state carbon nanotube device for controllable trion electroluminescence emission

Supplementary files

Article information

Article type
Paper
Submitted
27 Oct 2015
Accepted
16 Feb 2016
First published
23 Feb 2016

Nanoscale, 2016,8, 6761-6769

Author version available

Solid state carbon nanotube device for controllable trion electroluminescence emission

S. Liang, Z. Ma, N. Wei, H. Liu, S. Wang and L. Peng, Nanoscale, 2016, 8, 6761 DOI: 10.1039/C5NR07468A

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