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Growth and Brilliant Photo-Emission of Crystalline Hexagonal Column of Alq3 Microwires

Department of Applied Organic Materials Engineering, Inha University, Incheon 22212, Korea
Department of Chemical Engineering, Inha University, Incheon 22212, Korea
Author to whom correspondence should be addressed.
These authors contributed equally.
Materials 2018, 11(4), 472;
Received: 28 February 2018 / Revised: 16 March 2018 / Accepted: 19 March 2018 / Published: 22 March 2018
(This article belongs to the Special Issue Novel Photoactive Materials)
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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. View Full-Text
Keywords: organometal; Alq3; photoluminescence; crystallinity; surfactant; confocal microscope organometal; Alq3; photoluminescence; crystallinity; surfactant; confocal microscope

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Kim, S.; Kim, D.H.; Choi, J.; Lee, H.; Kim, S.-Y.; Park, J.W.; Park, D.H. Growth and Brilliant Photo-Emission of Crystalline Hexagonal Column of Alq3 Microwires. Materials 2018, 11, 472.

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