Separation of extremely small indium oxide quantum dots and their highly luminescent properties by dispersing agent

Do Hyun Kim, Hyeran Cho, Myeung jin Lee, Hong Dae Kim, Dong Jin Lee, Gyu Tae Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Acquiring extremely small quantum dots (QDs) absorbing and emitting light in the ultraviolet region is challenging because of the difficulty in size control via chemical synthesis. Here, we report that extremely small In2O3 QDs with high crystallinity can be earned from a pristine In2O3 powder of which the average size exceeds the range of QDs. Interestingly, we extracted the extremely small In2O3 QDs by a series of filtration processes of an In2O3 suspension. Transmission electron microscopy images confirmed In2O3 nanoparticles falling within the range of QDs. The tiny In2O3 QDs absorbed light at a wavelength of 220 and 280 nm and exhibited the maximum photoluminescence spectra in the ultraviolet region under the excitation of the wavelengths. Furthermore, we investigated the effect of a surfactant on the optical properties of In2O3 QDs separated from the powder. As a result, the luminescent intensity of In2O3 QDs enhanced drastically with the addition of sodium dodecylbenzene sulfonate. Our findings pave the way to acquiring highly luminescent tiny QDs from other semiconducting powders.

Original languageEnglish
Article number166073
JournalJournal of Alloys and Compounds
Publication statusPublished - 2022 Nov 15

Bibliographical note

Funding Information:
This research was supported by Nano-Material Technology Development Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science & ICT (Grant No. NRF-2017M3A7B4049119 ) and the Ministry of Trade, Industry and Energy, Korea (Grant No. 2005721 ).

Publisher Copyright:
© 2022 Elsevier B.V.


  • Luminescence
  • Nanofabrications
  • Nanostructured materials
  • Optical spectroscopy
  • Oxide materials

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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