• The Journal of the Petrological Society of Korea
• /
• v.23 no.2
• /
• pp.139-144
• /
• 2014

A series of the planar cathodoluminescence (CL) and backscattered-electron (BSE) images of magmatic zircon from the Paleozoic Yeongdeok pluton in the southeastern Korean Peninsula were taken using a scanning electron microscope for a 3D reconstruction of internal zonation of zircon. Seven zircon crystals mounted in epoxy were serially polished with average $3{\mu}m$ thickness to their disappearance. Their 3D reconstruction of zonation was performed using the Volume Viewer function in the ImageJ software. The 3D oscillatory zoning pattern of zircon was apparently shown in all the analyzed crystals. This method can further be applied to zircon crystals of multiple growth histories as well as other geological materials.

• Journal of the Mineralogical Society of Korea
• /
• v.17 no.2
• /
• pp.123-133
• /
• 2004

Carbonate minerals are examined by cathodoluminescence microscopy and chemical analysis to characterize the carbonate materials occurring in the Tertiary marine basin. The microscopic technique with cathodoluminescence gives new informations that are not obtainable by conventional microscopic techniques. The carbonate cements in sandstones appear to be uniform with transmitted light or with crossed prisms. but the inspection with cathololuminescence reveals foraminiferal tests and rhomb crystals in the carbonate cements. The chemical analysis indicates that the intense luminescence depends mainly on the presence of$ Mn^{ 2+}$ and $Fe^{2+}$ as activator ions, but the $Fe^{2+}$ also acts as an important quencher ion when Fe concentration in dolomite is over 10,000 ppm. The dolomites, which are rich in calcium, are formed at the early stage of diagenesis at a temperature of about 60 ～ $70^{\circ}C$.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2009.08a
• /
• pp.131-131
• /
• 2009

• Proceedings of the Korea Society for Energy Engineering kosee Conference
• /
• 2003.05a
• /
• pp.377-382
• /
• 2003

본 연구의 대상인 자체발광 유리관은 밀봉된 유리관 내의 삼중수소에서 방출되는 베타입자와 유리관 내벽의 형광체와의 발광반응 메카니즘을 이용한 것이다. 자발광체는 삼중수소의 자연 붕괴와 형광체의 열화에 의해서 형광 효율이 감소되어 자발광체를 제조한 날로부터 지속적으로 휘도가 줄어들게 된다. 본 연구에서는 자발광체 제조 시 형광체의 열화를 최소화하기 위하여 형광체 열화에 영향을 미치는 요소인 온도, 온도 유지 시간, 공정 시 필요한 분위기를 다꾸지 방법에 의한 실험계획법으로 3인자 3수준의 교호작용을 고려하여 형광체의 음극선 발광 특성을 검토하였다.

• Proceedings of the KIEE Conference
• /
• 2007.11a
• /
• pp.132-133
• /
• 2007

$In_xGa_{1-x}N/In_yGa_{1-y}N$ 다중 양자우물 녹색 발광 다이오드에 2차원 광자 결정을 이용하여 음극선 발광의 향상을 관찰 하였다. 정사각형 배열의 2차원 광자 결정의 주기와 격자 상수는 200/500 nm 이고 전자빔 리소그래피로 광자결정 패턴을 제작한 후, 플라즈마 건식 식각법으로 패턴을 구현하였다. 식각 시간의 차이를 둔 구현된 패턴의 홀 깊이는, 각각 ${\sim}69nm,\;{\sim}99nm,\;{\sim}173nm$ 이었다. 전계 방사 주사 현미경 측정 결과, 형성된 홀은 끝이 잘린 역전된 원뿔 모양으로 식각 되었다. 식각 된 홀의 깊이에 따라 광자 결정이 있는 부분이 없는 부분보다 최대 ${\sim}30$배 많은 광자가 검출 됨을 확인하였다.

• Journal of the Korean Institute of Telematics and Electronics D
• /
• v.36D no.12
• /
• pp.31-36
• /
• 1999

The $Mg._5Zn._5SiN_2:Tb$ and $Mg._5Zn._5SiN_2:Eu$ materials were synthesized and studied to develop new phosphors for thin-film electroluminescent device application. Photoluminescence and cathodoluminescence characteristics of the synthesized phosphors were similar to general emission spectra of Eu, Tb ion, respectively. The CIE color coordinates, threshold voltage and luminance of the $Mg._8Zn._2SiN_2:Eu$ thin-film electroluminescent device fabricated by electron-beam deposition system were x=0.47, y=0.46, 47V, and 23.5 cd/$cm^2$ at 80V, respectively. The capacitance-voltage and charge-voltage characteristics of the thin film electroluminescent devices were also measured.

• Journal of the Korean Vacuum Society
• /
• v.16 no.3
• /
• pp.181-186
• /
• 2007

We have investigated and analyzed the effects of the evaporation rate of MgO films on the MgO properties and the discharge characteristics of a plasma display panel(PDP). The MgO properties such as the crystal orientation, the surface roughness, the film structure, and cathode-luminescence (CL) spectra were inspected using XRD (X-ray diffraction), AFM(atomic force microscopy). And the discharging characteristics of the PDP such as the firing voltage, discharging current, and luminescence were measured using a vacuum chamber with oscilloscope (TDS 540C), current probe (TCP-312A), color meter (CS-100A) and etc. From the experiments results we confirmed the optimum evaporation rate at $5{\AA}/sec$, the MgO properties were shown to be strongly dependent on the evaporation rate, and the MgO properties had an effecton the optical and electrical characteristics. In other words, if the evaporation rates increase than $5{\AA}/sec$, the intensity of (200) orientation and cathode-luminescence (CL) spectra reduce, and the firing vlotage was increased. So the luminuous efficiency grows worse.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 1999.11a
• /
• pp.590-593
• /
• 1999

$Y_2SiO_5$:Ce was considered as blue phosphor for field emission display because it had an excellent resistance against brightness saturation. But unfortunately It hadn't a sufficient brightness to be applied to FED. In this experiment It-$In_2O_3$, MgO and $SiO_2$ were coated onto $Y_2SiO_5$:Ce phosphor in order to improve the cathodoluminance(CL properties. The coating structures were identified to be the crystalline phases of $In_2O_3$ and MgO respectively. They had fine particle-like shape and were distributed on the surface of $Y_2SiO_5$:Ce phosphor. It was found that the CL efficiency of $Y_2SiO_5$:Ce phosphors were decreased after coatings with In20:j and MgO in voltage range from 500 V to 5 kV. But the brightness of $Y_2SiO_5$:Ce phosphor was increased after coating of 5 0 2 . And also the aging test showed that $In_2O_3$ coating improved the life time of $Y_2SiO_5$:Ce phosphor.

• Korean Journal of Materials Research
• /
• v.10 no.8
• /
• pp.558-563
• /
• 2000

$Y_2SiO_5:Ce$ phosphor was coated with $In_2O_3$, $Al_2O_3$ and $SiO_2$ and then their cathodoluminance(CL)proper-ties required in field emission display were investigated. It was found that luminance efficiency and aging p개perty of $Y_2SiO_5:Ce$ phosphor was decreased with $In_2O_3$coating. For the case of coating, the luminance intensity was in blue phosphor was dramatically increased with $SiO_2$ coating. And also the aging property of $Y_2SiO_5:Ce$ Phosphor coated with $SiO_2$ was significantly improved compared to non-coated sample.

• Journal of the Korean Ceramic Society
• /
• v.36 no.3
• /
• pp.319-324
• /
• 1999

기존의 고상 반응법에 의해 합성된 YNbO4 : Bi 형광체의 발광특성을 개선하기 위하여 B2O3 융체 첨가법으로 형광체를 합성하고, 빛발광(PL) 및 저전압 음극선발광(CL)을 측정하였다. PL 및 CL 모두 415~440 nm 영역에서 강한 청색 발광 스펙트럼을 나타냈으며, 고상 반응의 경우와 마찬가지로 Y/Nb 비율이 화학 양론상의 1:1인 경우보다 결함구조를 인위적으로 조절한 51/49나 54/46에서 최대의 발광강도를 보였다. 한편, 고상 반응에서는 125$0^{\circ}C$에서 4시간 열처리하는 것이 최대의 발광효과를 나타냈으나, B2O3융제를 첨가하고 110$0^{\circ}C$에서 열처리한 시료가 결정성이 좋고 입자의 크기 및 형태가 균일하여 PL뿐만 아니라 CL에서도 우수한 발광특성을 보였다. B2O3융제를 첨가하는 방법으로 열처리 온도를 낮추고 입자크기와 형태를 조절하여 형광체의 휘도를 개선할 수 있었다.