手性分选的（9，7）半导体碳纳米管器件的电致发光
Electroluminescence from chirality-sorted (9,7)-semiconducting carbon nanotube devices
摘要：
我们测量了（9，7）半导体碳纳米管器件的电致发光和光致发光，并证明了电致发光波长由碳纳米管的手性指数（n，m）决定。该器件是由单手性分散体的管的介电泳组装在Si3N4膜上制成的。电驱动（9，7）器件在光谱的可见光部分中在825 nm处表现出单个洛伦兹形发射峰。通过比较电致发光光谱和相应的光致发光激发图，可以将发射归属于激子E22带间跃迁。我们示出了电流的EL峰宽的线性依赖关系，并提供证据的惰性Si3N4表面相对于纳米管的光学性能。
英文摘要：
We have measured the electroluminescence and photoluminescence of (9,7) semiconducting carbon nanotube devices and demonstrate that the electroluminescence wavelength is determined by the nanotube's chiral index (n,m). The devices were fabricated on Si3N4 membranes by dielectrophoretic assembly of tubes from monochiral dispersion. Electrically driven (9,7) devices exhibit a single Lorentzian shaped emission peak at 825 nm in the visible part of the spectrum. The emission could be assigned to the excitonic E22 interband transition by comparison of the electroluminescence spectra with corresponding photoluminescence excitation maps. We show a linear dependence of the EL peak width on the electrical current, and provide evidence for the inertness of Si3N4 surfaces with respect to the nanotubes optical properties.
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