Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Energy Transfer and Cross-Relaxation in $Tb^{3+}$-doped Borosilicate Glasses

$Tb^{3+}$를 첨가한 Borosilicate 유리속에서 일어나는 에너지 전달과 Cross-Relaxation

  • 김중환 (동의대학교 자연과학대학 물리학과) ;
  • 문병기 (부산대학교 자연과학대학 물리학과) ;
  • 오학태 (부산대학교 자연과학대학 물리학과) ;
  • 김학수 (부산대학교 자연과학대학 물리학과) ;
  • 윤수인 (부산대학교 자연과학대학 물리학과) ;
  • 서효진 (부산공업대학) ;
  • 설정식 (경남대학교 자연과학대학 물리학과)
  • Published : 1990.09.01
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Abstract

Energy transfer in $Tb^{3+}$-doped borosilicate glasses has been studied by the analysis of fluorescence intensities and lifetimes of $^5D_3$ and $^5D_4$ states as a function of Tb3+ concentration. It is shown that as the $Tb^{3+}$ concentration is increased the cross-relaxation produces high population of the $^5D_4$ state at the expense of $^5D_3$. It is also found that this interaction is predominantly dipole-dipole transition with critical distance of 13 A. The critical distance for energy transfer $^5D_4$$^5D_4$ which is responsible for the quenching of 5D4 emission at high concentratron of Tb3+ ions is 4.5 A.

$Tb^{3+}$이온을 첨가한 borosilicate 유리속에서 일어나는 에너지전달을 연구하기 위하여 $Tb^{3+}$이온의 농도에 따른 형광방출의 세기 및 $^5D_3$과 $^5D_4$ 준위의 형광수명시간을 측정.분석하였다. $Tb^{3+}$이온농도가 증가하면 cross-relaxation에 의해 $^5D_3$ 준위의 상태밀도가 줄어드는 대신에 $^5D_4$ 준위의 상태밀도가 증가했다. 그리고 이 상호작용은 전기 쌍극자-전기쌍극자 상호작용이며 임계작용거리는 13$\AA$이었다. 또 5D4 형광방출을 소광시키는 원인이 되는 $^5D_4$$\longrightarrow$$^5D_4$형의 에너지전달은 그 임계작용거리가 3.5$\AA$으로 나타났다.

Keywords

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