Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Enhanced UV-Light Emission in ZnO/ZnS Quantum Dot Nanocrystals

산화아연/황화아연 양자점 나노결정에서의 향상된 자외선 방출

  • Kim, Ki-Eun (Department of Materials Science & Engineering, Korea University) ;
  • Kim, Woong (Department of Materials Science & Engineering, Korea University) ;
  • Sung, Yun-Mo (Department of Materials Science & Engineering, Korea University)
  • 김기은 (고려대학교 신소재공학부) ;
  • 김웅 (고려대학교 신소재공학부) ;
  • 성윤모 (고려대학교 신소재공학부)
  • Published : 2008.12.27
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Abstract

ZnO/ZnS core/shell nanocrystals (${\sim}5-7\;nm$ in diameter) with a size close to the quantum confinement regime were successfully synthesized using polyol and thermolysis. X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) analyses reveal that they exist in a highly crystalline wurtzite structure. The ZnO/ZnS nanocrystals show significantly enhanced UV-light emission (${\sim}384\;nm$) due to effective surface passivation of the ZnO core, whereas the emission of green light (${\sim}550\;nm$) was almost negligible. They also showed slight photoluminescence (PL) red-shift, which is possibly due to further growth of the ZnO core and/or the extension of the electron wave function to the shell. The ZnO/ZnS core/shell nanocrystals demonstrate strong potential for use as low-cost UV-light emitting devices.

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References

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