Size tunability and optical properties of CdSe quantum dots for various growth conditions

Eun Yee Ko, Joo In Lee, Ju Won Jeon, In-Hwan Lee, Yong Hyeon Shin, Il Ki Han

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We report the optical properties of CdSe quantum dots (QDs) synthesized under various growth conditions, such as growth temperature, growth time, ligand ratio, and Cd:Se ratio of the precursors. As the growth temperature and time was increased, the peaks of the photoluminescence (PL) spectra were a red shifted, indicating that the size of QDs increased. Different ligand ratios and Cd:Se ratios of the precursors played important roles in determining the QDs size. From the PL spectra and the transmission electron microscopy image, the size distribution, as well as the size of CdSe QDs, could be controlled by using the growth conditions. The temperature-dependent PL of CdSe QDs dropped and dried on Si substrates was measured at temperatures from 15 K to 290 K. With increasing temperature, the red shift of the QDs was about 35 meV, which is noticeably smaller than that of bulk CdSe (~100 meV). The influence of the temperature on the optical properties of colloidal CdSe QDs is important for an application to various devices.

Original languageEnglish
Pages (from-to)121-126
Number of pages6
JournalJournal of the Korean Physical Society
Volume62
Issue number1
DOIs
Publication statusPublished - 2013 Jan 29
Externally publishedYes

Keywords

  • CdSe
  • Photoluminescence
  • Precursor
  • Quantum dots

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Size tunability and optical properties of CdSe quantum dots for various growth conditions'. Together they form a unique fingerprint.

  • Cite this