Direct evidence of delayed electroluminescence from carbon nanotubes on the macroscale

作者：Janas D; Czechowski N; Mackowski S; Koziol K K^*

来源：Applied Physics Letters, 2014, 104(26): 261107.

DOI：10.1063/1.4886800

Spectrally resolved and kinetic response of electroluminescence was monitored from resistively heated carbon nanotube (CNT) macroassemblies. Sensitive detection system and custom-made setup for high-speed optoelectronic measurements were employed to investigate unsorted and single chirality-enriched CNTs. By increasing the content of (7,6) or (6,5) CNTs in a sample, the E11 emission peak in the infrared region became more narrow (similar to 150 nm), hence approaching that of commercial emitters for this spectral range. Moreover, electroluminescence initiation in CNTs occurred very rapidly and reached its full intensity within tens of milliseconds. Interestingly, observed delay between bias voltage application and electroluminescence proved triplet-triplet annihilation in the macroscopic assembly of CNTs.

• 出版日期2014-6-30