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박막형 ZnGa₂O₄:Mn 산화물 형광체의 음극선루미느센스와 구조적 특성에 관한 연구
김주한(Joo Han Kim),Paul H. Holloway 한국진공학회(ASCT) 2006 Applied Science and Convergence Technology Vol.15 No.5
본 연구에서는 박막형 ZnGa₂O₄:Mn 산화물 형광체의 음극선루미느센스 특성과 구조적 성질에 대하여 field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), photoluminescence (PL), 그리고 cathodoluminescence (CL) 방법을 이용하여 조사하였다. ZnGa₂O₄:Mn 형광체 타겟으로부터 Mn²? 이온의 ⁴T₁ → ?A₁ 전이에 의한 506㎚ 파장에서의 PL emission 스펙트럼이 관찰되었다. 색좌표는 x = 0.09, y = 0.67 이었다. ZnGa₂O₄:Mn 박막의 여기 스펙트럼은 Mn²? 이온 흡수에 의한 294 ㎚의 피크 파장을 나타내었다. 낮은 압력에서 증착한 ZnGa₂O₄:Mn 형광체 박막은 고밀도의 치밀한 단면구조를 보였고, 높은 세기의 음극선루미느센스가 505 ㎚ 피크 파장에서 나타났다. 표면 거칠기가 음극선루미느센스의 세기에 미치는 영향은 관찰되지 않았다. In this study we have investigated cathodoluminescence (CL) and structural properties of thin film ZnGa₂O₄:Mn oxide phosphor by using field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), photoluminescence (PL), and cathodoluminescence. PL emission peaked at 506 ㎚ was observed from the ZnGa₂O₄:Mn phosphor target and it was attributed to the ⁴T₁ - ?A₁ transition in Mn²? ion. The color coordinates of the emission were x = 0.09 and y = 0.67. The ZnGa₂O₄:Mn films showed the excitation spectrum peaked at 294 ㎚ by Mn²? ion absorption. It was found that the higher intensity of CL emission at 505 ㎚ appears to result from the denser and closely-packed structure in ZnGa₂O₄:Mn phosphor films deposited at lower pressures. The CL intensity did not show any systematic dependence on film surface roughness.
Synthesis and luminescent properties of rare earth-doped YVO4 nanocrystalline powders
양희선,Sooyeon Seo,Mostafa Abboudi,Paul H. Holloway 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.4
A presentation is given of large scale rare earth-doped YVO4 nanocrystalline powders synthesized using an organic acid-based easy, soft chemistry. First, V2O5 precursor was reduced (from V5+ to V4+) in the presence of oxalic acid at 200 oC, forming oxalate compounds. Subsequent addition of yttrium nitrate and rare earth (Er or Nd) nitrate mixed with citric acid and the reaction of the resulting mixture at 400 oC led to Er- (or Nd-) doped YVO4 nanocrystalline powders. Photoluminescent properties (emission and excitation) of near infrared (NIR) (4I11/2→ 4I15/2) emitting nanocrystalline YVO4:Er phosphor were characterized as a function of the Er concentration and post-annealing temperature. Characteristic NIR (4F3/2→ 4I11/2) emission of nanocrystalline YVO4:Nd phosphor is also reported.