Abstract
We report on the fabrication and nanoscale luminescence characteristics of an isolated rubrene single nanoparticle (NP). A solvent-vapor annealing process changed pristine rubrene NPs, prepared by a reprecipitation method, to perfect crystalline NPs. The formation and structural properties of crystalline and non-crystalline rubrene NPs were studied through SEM, HR-TEM, and X-ray diffraction experiments. The nanoscale photoluminescence (PL) characteristics and the luminescence color of the rubrene single NP were measured using a high-resolution laser confocal microscope with color charge-coupled device images. In comparison with the pristine rubrene NPs, the crystalline NPs exhibited highly bright and sharp light emission. The main PL peak at 561-562 nm for the crystalline rubrene single NP had a relatively narrow line-width and became more dominant through a solvent-vapor annealing. The enhanced and sharp light emission of the crystalline rubrene single NP originated from the strong π-π interaction of rubrene molecules along the major crystalline axis in the nano-sized structure.
Original language | English |
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Pages (from-to) | 8002-8007 |
Number of pages | 6 |
Journal | Journal of Materials Chemistry |
Volume | 21 |
Issue number | 22 |
DOIs | |
State | Published - 14 Jun 2011 |
Externally published | Yes |