Abstract
We report the growth and nanoscale luminescence characteristics of 8-hydroxyquinolinato aluminum (Alq3) with a crystalline hexagonal column morphology. Pristine Alq3 nanoparticles (NPs) were prepared using a conventional reprecipitation method. Crystal hexagonal columns of Alq3 were grown by using a surfactant-assisted self-assembly technique as an adjunct to the aforementioned reprecipitation method. The formation and structural properties of the crystalline and non-crystalline Alq3 NPs were analyzed with scanning electron microscopy and X-ray diffraction. The nanoscale photoluminescence (PL) characteristics and the luminescence color of the Alq3 single NPs and their crystal microwires (MWs) were evaluated from color charge-coupled device images acquired using a high-resolution laser confocal microscope. In comparison with the Alq3 NPs, the crystalline MWs exhibited a very bright and sharp emission. This enhanced and sharp emission from the crystalline Alq3 single MWs originated from effective π-π stacking of the Alq3 molecules due to strong interactions in the crystalline structure.
Highlights
Organic semiconductors have emerged as a major class of plausible candidates for achieving low-cost, flexible and high-efficiency electronic devices [1,2]
Laser confocal microscope (LCM) PL spectra were acquired with a homemade LCM instrument [19,20,21,22]
When a surfactant was employed along with the reprecipitation process, crystalline hexagonal columns were formed with growth in only one specific direction
Summary
Organic semiconductors have emerged as a major class of plausible candidates for achieving low-cost, flexible and high-efficiency electronic devices [1,2]. There arecan relatively few reports the on the optical characteristics of single units in the solidand π-π stacking, strongly influence final packing structure [14,15]. This studyonfocuses on the nanoscale photoluminescence characteristics of study. Alq relatively few reports the optical characteristics of single units in the(PL) This crystals an attempt to examine changes in the structural andinoptical properties focuses in onthe thesolid-state nanoscalein photoluminescence (PL)the characteristics of Alq the solid-state in 3 crystals upon crystallization [16,17].
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