http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 조선욱(Shinho Cho) (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
Eu³⁺ 함량비가 Y<SUB>1-x</SUB>PO₄:Eu<SUB>x</SUB>³⁺ 적색 형광체의 발광 특성에 미치는 영향
조선욱(Seon-Woog Cho),조신호(Shinho Cho) 한국진공학회(ASCT) 2011 Applied Science and Convergence Technology Vol.20 No.6
고상 반응법을 사용하여 Eu³? 이온의 함량비를 변화시키면서 Y1-xPO₄:Eux³? 적색 형광체를 합성하였다. 모든 적색 형광체의 결정 구조는 25.88˚에 중심을 갖는 (200) 주 회절 피크로 구성되는 정방정계이었으며, 결정 입자의 형상은 Eu³? 이온의 함량비가 증가함에 따라 구형에 근접하고 균일한 크기 분포를 나타내었다. 형광 특성의 경우에, Eu³? 이온의 함량비에 관계없이 모든 세라믹은 파장 593.0과 619.2 nm에 피크를 갖는 각각 적주황색과 적색 형광을 나타내었다. Eu³? 이온의 함량비가 증가함에 따라 여기 스펙트럼의 파장은 약간씩 장파장 쪽으로 이동하면서 흡수 세기는 증가하는 경향을 보였으며, Eu³? 이온의 함량비가 0.15 mol일 때 최대 흡수 및 발광 스펙트럼이 관측되었다. Y1-xPO₄:Eux³? red phosphors were synthesized with changing the concentration of Eu³? ion by using a solid-state reaction method. The crystal structures of all the red phosphors were found to be a tetragonal system composed of (200) diffraction peak centered at 25.88˚, and the morphology of grains approached the spherical form with homeogenous size distribution as the concentration of Eu³? ion increased. As for the photoluminescence properties, all of the ceramic phosphors, irrespective of Eu³? ion concentration, showed the red-orange and the red emission peaked at 593.0 and 619.2 nm respectively. As the concentration of Eu³? ion increased, the excitation spectrum moved into a longer wavelength with the increase of emission intensity. The maximum excitation and the emission spectrum were observed at 0.15 mol of Eu³? ion.
-
Sm<SUP>3+</SUP> 도핑된 GdVO₄ 형광체의 제조와 발광 특성
조신호(Shinho Cho),조선욱(Seon-Woog Cho) 한국진공학회(ASCT) 2012 Applied Science and Convergence Technology Vol.21 No.2
고상 반응법을 사용하여 Sm<SUP>3+</SUP> 이온의 함량비를 변화시키면서 Gd1-xVO₄:Eux<SUP>3+</SUP> 형광체 분말을 합성하였다. 모든 형광체 시료의 결정 구조는 24.76o에 중심을 갖는 (200) 주 회절 피크로 구성되는 정방정계이었으며, 결정 입자의 형상은 Sm<SUP>3+</SUP> 이온의 함량비가 0.05 ㏖일 때 구형에 근접하고 균일한 크기 분포를 나타내었다. 발광 특성의 경우에, Sm3+ 이온의 함량비에 관계없이 모든 형광체 분말은 파장 565, 603, 645 ㎚에 피크를 갖는 각각 황색, 주황색, 적색 형광을 보였다. Sm<SUP>3+</SUP> 이온의 함량비가 증가함에 따라 흡수 스펙트럼의 세기는 감소하는 경향을 나타내었으며, Sm3+ 이온의 함량비가 0.05 ㏖일 때 최대 흡수와 발광 스펙트럼이 관측되었고, 대칭비의 값은 1.19이었다 Gd1-xVO₄:Smx<SUP>3+</SUP> phosphor powders were synthesized with changing the concentration of Sm<SUP>3+</SUP> ion by using a solid-state reaction method. The crystal structures of all the phosphors were found to be a tetragonal system, composed of (200) diffraction peak centered at 24.76°, and the morphology of grains approached the spherical form with homeogenous size distribution when the concentration of Sm<SUP>3+</SUP> ion was 0.05 ㏖. As for the photoluminescence properties, all of the phosphor powders, irrespective of Sm<SUP>3+</SUP> ion concentration, indicated the yellow, orange, and red emission peaked at 565, 603, and 645 ㎚ respectively. As the concentration of Sm<SUP>3+</SUP> ion increases, the intensity of excitation spectrum showed a decreasing tendency on the increase of Sm<SUP>3+</SUP> ion concentration. The maximum excitation and emission spectra were observed and the symmetry ratio was 1.19 at 0.05 ㏖ of Sm<SUP>3+</SUP> ion.
-
라디오파 마그네트론 스퍼터링으로 성장한 질소와 알루미늄 도핑된 ZnO 박막의 특성
조신호(Shinho Cho),조선욱(Seon-Woog Cho) 한국표면공학회 2008 한국표면공학회지 Vol.41 No.4
Nitrogen and aluminum codoped ZnO (NAZO) thin films were grown on glass substrates with changing the nitrogen flow ratio by radio-frequency magnetron sputtering. The structural, optical, and electrical properties of the NAZO films were investigated. The surface morphologies and the structural properties of the thin films were analyzed by using the X-ray diffraction and scanning electron microscopy. The NAZO thin film, deposited at nitrogen flow ratio of 0%, showed a strongly c-axis preferred orientation and the lowest resistivity of 3.2×10?³ Ω㎝. The intensity of ZnO (002) diffraction peak was decreased gradually with increasing the nitrogen flow ratio. The optical properties of the films were measured by UV-VIS spectrophotometer and the optical transmittances for all the samples were found to be an average 90% in the visible range. Based on the transmittance value, the optical bandgap energy for the NAZO thin film deposited at nitrogen flow ratio of 0% was determined to be 3.46 eV. As for the electrical properties, the carrier concentration and the hall mobility were decreased, but the electrical resistivity was increased as the nitrogen flow ratio was increased.
-
BaMoO<sub>4</sub>:Tb<sup>3+</sup> 형광체의 발광과 농도 소광 특성
조신호,김진대,황동현,조선욱,Cho, Shinho,Kim, Jindae,Hwang, Donghyun,Cho, Seon-Woog 한국재료학회 2016 한국재료학회지 Vol.26 No.2
$BaMoO_4:Tb^{3+}$ 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.
-
ScienceON연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
