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

  • 제18권1호
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  • Pages.27-32
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  • 2008
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  • 1225-1429(pISSN)
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  • 2234-5078(eISSN)
한국결정성장학회 (The Korea Association of Crystal Growth)
권호 표지

$Er^{3+}$를 첨가한 $CaZrO_3$ 축광성 형광체의 합성 및 발광 특성 분석

Synthesis and luminescent properties of $Er^{3+}$ doped $CaZrO_3$ long persistent phosphors

  • 발행 : 2008.02.29
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⟨ 이전 논문 다음 논문 ⟩

초록

새로운 $CaZrO_3:Er^{3+}$ 축광성 형광체를 전통적인 고상반응법으로 제조하였으며, 분쇄한 축광성 형광체를 X 선 회절 분석, 광발광 분석, 열발광 분석과 휘도계를 통하여 장잔광 특성을 분석하였다. X 선 회절 분석 결과 순수한 $CaZrO_3$ 결정상을 확인 하였으며, 고온의 질소 분위기에서 합성한 경우 446 nm 와 550 nm의 넓은 발광 피크가 나타났다. 합성한 장잔광 특성의 형광체의 발광 지속시간은 254 nm UV lamp로 여기 시킨 후 어두운 곳에서 6시간 이상 스스로 발광 하였다. 발광 피크는 $Er^{3+}$ 이온의 $^5D_{5/2}{\rightarrow}^4F_{9/2},\;^2H_{12/2},\;^4S_{3/2}{\rightarrow}^4I_{13/2}$ 그리고 $^2G_{9/2}{\rightarrow}^4I_{13/2}$ 전이에 의한 것이며, 잔광 특성은 $CaZrO_3$ 격자 내에 적당한 trap center가 형성 된 것으로 판단된다.

Novel long persistent phosphors of $CaZrO_3:Er^{3+}$ have been synthesized by traditional solid state reaction method. The long persistent phosphor crystalline particles were characterized by the X-ray diffraction (XRD), photoluminescence spectrophotometer, thermoluminescence (TL) and luminance meter. The results reveal that the samples are composed of single $CaZrO_3$ phase. The broadband emission spectra of 446 nm peak and 550 nm peak was revealed by synthesized at high temperature in $N_2$ gas. Green long persistent phosphors have been observed in the sys_em for over 6 h after UV irradiation (254 nm). The main emission peak was ascribed to $Er^{3+}$ ions transition from $^5D_{5/2}{\rightarrow}^4F_{9/2},\;^2H_{12/2},\;^4S_{3/2}{\rightarrow}^4I_{13/2}\;and\;^2G_{9/2}{\rightarrow}^4I_{13/2}$, and the afterglow may be ascribed to the suitable trap centers in the $CaZrO_3$ host lattice.

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