Tuning photoluminescence of organic rubrene nanoparticles through a hydrothermal process

Mi Suk Kim, Eun Hei Cho, Dong Hyuk Park, Hyunjung Jung, Joona Bang, Jinsoo Joo

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Abstract

Light-emitting 5,6,11,12-tetraphenylnaphthacene (rubrene) nanoparticles (NPs) prepared by a reprecipitation method were treated hydrothermally. The diameters of hydrothermally treated rubrene NPs were changed from 100 nm to 2 μm, depending on hydrothermal temperature. Photoluminescence (PL) characteristics of rubrene NPs varied with hydrothermal temperatures. Luminescence of pristine rubrene NPs was yellow-orange, and it changed to blue as the hydrothermal temperature increased to 180°C. The light-emitting color distribution of the NPs was confirmed using confocal laser spectrum microscope. As the hydrothermal temperature increased from 110°C to 160°C, the blue light emission at 464 to approximately 516 nm from filtered-down NPs was enhanced by H-type aggregation. Filtered-up rubrene NPs treated at 170°C and 180°C exhibited blue luminescence due to the decrease of intermolecular excimer densities with the rapid increase in size. Variations in PL of hydrothermally treated rubrene NPs resulted from different size distributions of the NPs.

Original languageEnglish
Article number405
Pages (from-to)1-8
Number of pages8
JournalNanoscale Research Letters
Volume6
DOIs
Publication statusPublished - 2011 Dec 1

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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