Blue luminescent center in undoped ZnO thin films grown by plasma-assisted molecular beam epitaxy

Jong Bin Kim, Young Soo No, Dong Jin Byun, Dong Hee Park, Won Kook Choi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

ZnO thin film was grown on a sapphire single crystal substrate by plasma assisted molecular beam epitaxy. In addition to near band edge (NBE) emissions, both blue and green luminescences are also observed together. The PL intensity of the blue luminescence (BL) range from 2.7 to 2.9 eV increased as the amount of activated oxygen increased, but green luminescence (GL) was weakly observed at about 2.4 eV without much change in intensity. This result is quite unlike previous studies in which BL and GL were regarded as the transition between shallow donor levels such as oxygen vacancy and interstitial zinc. Based on the transition level and formation energy of the ZnO intrinsic defects predicted through the first principle calculation, which employs density functional approximation (DFA) revised by local density approximation (LDA) and the LDA+U approach, the green and blue luminescence are nearly coincident with the transition from the conduction band to zinc vacancies of V2- Zn and V- Zn, respectively.

Original languageEnglish
Pages (from-to)281-287
Number of pages7
JournalKorean Journal of Materials Research
Volume19
Issue number5
DOIs
Publication statusPublished - 2009 Aug 18

Keywords

  • Blue luminescence
  • Oxygen vacancy
  • Plasma-assisted molecular beam epitaxy
  • Zn vacancy
  • ZnO thin film

ASJC Scopus subject areas

  • Materials Science(all)

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