DOI QR코드

DOI QR Code

BaMoO4:Tb3+ 형광체의 발광과 농도 소광 특성

Photoluminescence and Concentration Quenching Properties of BaMoO4:Tb3+ Phosphors

  • 조신호 (신라대학교 신소재공학과, 녹색융합기술센터) ;
  • 김진대 (신라대학교 신소재공학과, 녹색융합기술센터) ;
  • 황동현 (신라대학교 신소재공학과, 녹색융합기술센터) ;
  • 조선욱 (신라대학교 신소재공학과, 녹색융합기술센터)
  • Cho, Shinho (Department of Materials Science and Engineering and Center for Green Fusion Technology, Silla University) ;
  • Kim, Jindae (Department of Materials Science and Engineering and Center for Green Fusion Technology, Silla University) ;
  • Hwang, Donghyun (Department of Materials Science and Engineering and Center for Green Fusion Technology, Silla University) ;
  • Cho, Seon-Woog (Department of Materials Science and Engineering and Center for Green Fusion Technology, Silla University)
  • 투고 : 2015.11.12
  • 심사 : 2015.12.31
  • 발행 : 2016.02.27

초록

$BaMoO_4:Tb^{3+}$ phosphor powders were synthesized with different concentrations of $Tb^{3+}$ ions using the solid-state reaction method. XRD patterns showed that all the phosphors, irrespective of the concentration of $Tb^{3+}$ ions, had tetragonal systems with two main (112) and (004) diffraction peaks. The excitation spectra of the $Tb^{3+}$-doped $BaMoO_4$ phosphors consisted of an intense broad band centered at 290 nm in the range of 230-330 nm and two weak bands. The former broad band corresponded to the $4f^8{\rightarrow}4f^75d^1$ transition of $Tb^{3+}$ ions; the latter two weak bands were ascribed to the $^7F_2{\rightarrow}^5D_3$ (471 nm) and $^7F_6{\rightarrow}^5D_4$ (492 nm) transitions of $Tb^{3+}$. The main emission band, when excited at 290 nm, showed a strong green band at 550 nm arising from the $^5D_4{\rightarrow}^7F_5$ transition of $Tb^{3+}$ ions. As the concentration of $Tb^{3+}$ increased from 1 to 10 mol%, the intensities of all the emission lines gradually increased, approached maxima at 10 mol% of $Tb^{3+}$ ions, and then showed a decreasing tendency with further increase in the $Tb^{3+}$ ions due to the concentration quenching effect. The critical distance between neighboring $Tb^{3+}$ ions for concentration quenching was calculated and found to be $12.3{\AA}$, which indicates that dipole-dipole interaction was the main mechanism for the concentration quenching of the $^5D_4{\rightarrow}^7F_5$ transition of $Tb^{3+}$ in the $BaMoO_4:Tb^{3+}$ phosphors.

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