title: 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.
authors.affiliation: Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871, China. shengwang@pku.edu.cn lmpeng@pku.edu.cn.
authors.forename: Shuang
authors.initials: S
authors.lastname: Liang
authors.affiliation: Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871, China. shengwang@pku.edu.cn lmpeng@pku.edu.cn.
authors.forename: Ze
authors.initials: Z
authors.lastname: Ma
authors.affiliation: Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871, China. shengwang@pku.edu.cn lmpeng@pku.edu.cn.
authors.forename: Nan
authors.initials: N
authors.lastname: Wei
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics and Collaborative Innovation Center of Quantum Matter, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Huaping
authors.initials: H
authors.lastname: Liu
authors.affiliation: Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871, China. shengwang@pku.edu.cn lmpeng@pku.edu.cn.
authors.forename: Sheng
authors.initials: S
authors.lastname: Wang
authors.affiliation: Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871, China. shengwang@pku.edu.cn lmpeng@pku.edu.cn.
authors.forename: Lian-Mao
authors.initials: LM
authors.lastname: Peng