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Effect of TiO Addition on Morphologies and Luminescence Properties of ZnO Crystals Fabricated by Vapor Transport Method

기상이동법에 의해 제조된 ZnO 결정의 형상 및 발광 특성에 미치는 TiO 첨가의 영향

Geun-Hyoung Lee†
이 근형†
Electrical & Electronic Materials Engineering Major, Division of Advanced Materials Engineering, Dong-eui University, Busan 47340, Republic of Korea
동의대학교 신소재공학부 전기전자소재공학전공
†Corresponding author E-Mail : ghl@deu.ac.kr (G.-H, Lee, Dong-eui Univ.)
October 2018. pp. 590-594
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Abstract

ZnO micro/nanocrystals are formed by a vapor transport method. Mixtures of ZnO and TiO powders are used as the source materials. The TiO powder acts as a reducing agent to reduce the ZnO to Zn and plays an important role in the formation of ZnO micro/nanocrystals. The vapor transport process is carried out in air at atmospheric pressure. When the weight ratios of TiO to ZnO in the source material are lower than 1:2, no ZnO micro/nanocrystals are formed. However, when the ratios of TiO to ZnO in the source material are greater than 1:1, the ZnO crystals with one-dimensional wire morphology are formed. In the room temperature cathodoluminescence spectra of all the products, a strong ultraviolet emission centered at 380 nm is observed. As the ratio of TiO to ZnO in the source material increases from 1:2 to 1:1, the intensity ratio of ultraviolet to visible emission increases, suggesting that the crystallinity of the ZnO crystals is improved. Only the ultraviolet emission is observed for the ZnO crystals prepared using the source material with a TiO/ZnO ratio of 2:1.

Keywords
zinc oxide crystals
ZnO and TiO powder mixture
thermal evaporation
reducing agent
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 28
  • No :10
  • Pages :590-594
  • Received Date : 2018-08-10
  • Revised Date : 2018-09-27
  • Accepted Date : 2018-09-27
  • DOI :https://doi.org/10.3740/MRSK.2018.28.10.590
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