Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Development of novel oxyfluoride glasses and glass ceramics for photoluminescence material by a containerless processing

무용기 용융법을 활용한 형광소재용 결정화 유리 개발

  • Hyerin Jo (Display Materials Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Minsung Hwang (Display Materials Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Youngjin Lee (Display Materials Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Jaeyeop Chung (Display Materials Center, Korea Institute of Ceramic Engineering and Technology)
  • 조혜린 (한국세라믹기술원 디스플레이소재센터) ;
  • 황민성 (한국세라믹기술원 디스플레이소재센터) ;
  • 이영진 (한국세라믹기술원 디스플레이소재센터) ;
  • 정재엽 (한국세라믹기술원 디스플레이소재센터)
  • Received : 2023.08.25
  • Accepted : 2023.09.11
  • Published : 2023.10.31
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Abstract

In this study, novel Eu2O3-BaF2-La2O3-B2O3 oxyfluoride glasses and glass ceramics were developed by a containerless processing. Differential thermal analysis (DTA) analysis was performed to analyze the thermophysical properties of oxyfluoride glasses doped with Eu2O3, and photoluminescence (PL) characteristics were analyzed to evaluate the luminous efficiency depending on the degree of crystallinity. The glass transition temperature decreased with increasing BaF2 concentration since BaF2 acts as a network modifier in this glass system. In addition, thermal stability which can be estimated by the difference between the glass transition temperature and the onset temperature of the crystallization decreased with increasing BaF2 contents. The peak related to the BaF2 crystal was confirmed after the crystallization by X-ray Diffraction (XRD) analysis. Photoluminescence intensity increased after the crystallization which indicates that the Eu3+ ions are sited in BaF2 crystal. La 3d5/2 x-ray photoelectron spectroscopy (XPS) and F1s XPS spectra were analyzed to precisely understand the behavior of the fluorine ion in the glass structure. Fluorine tends to bond with the network modifying cations such as La3+ and Ba2+ ions and after the crystallization the La-F bonds decreased because F- ions used to form BaF2 crystals.

본 연구에서는 containerless processing 법을 활용하여 새로운 형광 소재용 Eu2O3-BaF2-La2O3-B2O3 계 유리 및 결정화 유리를 개발하였다. 또한 조성 및 결정화 정도에 따른 유리의 열적, 광학적, 구조적 특성 변화를 분석하였다. 유리 조성에 따른 열적 특성은 DTA 분석을 통해 이루어졌으며, BaF22 함량의 증가에 따라 유리전이온도 및 유리화능이 급격히 감소하는 것을 확인하였다. 유리의 결정화 특성은 XRD 분석을 통해 확인되었으며, BaF2 결정상의 결정화 정도에 따라 발광 효율이 증가하는 것을 확인할 수 있었다. 유리구조 내에서 fluorine 이온의 결합특성을 분석하기 위해 La 3d5/2 XPS 및 F 1s XPS 스펙트럼을 분석하였다. fluorine 이온은 유리내에서 network modifier 역할을 하는 Ba2+ 및 La3+ 이온과 주로 결합하는 것을 확인할 수 있었고, 결정화 과정에서 La-F 결합이 감소하고 Ba-F 결합이 증가하는 것을 확인할 수 있었다.

Keywords

References

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