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RISS 인기검색어
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- 저자 : 온지원(Ji Won On) (검색결과 3 건)
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YBO<sub>3</sub>: Tb 형광체의 광특성에 대한 La<sup>3+</sup> 및 Ce<sup>3+</sup> 이온의 영향
온지원,이정백,김유혁,On, Ji-Won,Lee, Jeong-Baek,Kim, You-hyuk 한국재료학회 2003 한국재료학회지 Vol.13 No.8
In the present investigation, $La^{3+}$ and $Ce^{V}$ ions were substituted for $Y^{3+}$ in the $YBO_3$: Tb in various concentrations. It has been found that these phosphors form solid solutions within limited concentration ranges Excitation and emission spectra under 254 nm and 147 nm were investigated for these phosphors to evaluate influences of $La^{3+}$ and $Ce^{3+}$ ions on brightness and CIE color coordinates. It has been observed that brightness of $(Y, La)BO_3$: Tb under 254 nm and 147 nm when $La^{3+}$ ions are added show an increase of 2.7 times and 1.25 times, respectively. On the other hand, emission intensities of peaks in $Y_{0.8-x}$ $BO_3$: $Tb_{0.2}$ , $Ce_{x}$ show continuos decrease as $Ce^{3+}$ / content is increased from 0 to 0.4. CIE color coordinates of prepared phosphors show yellowish green which is needed to be improved to be used for display applications.
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[ $LaNbO_4$ ] : X (X = Bi, Eu)형광체의 발광 및 저 전압 음극선 발광 특성
온지원,김유혁,On Ji-Won,Kim Youhyuk 한국결정성장학회 2006 한국결정성장학회지 Vol.16 No.1
희토류계 niobates인 $LaNbO_4$(Ln : Y, La, Gd)는 자체 발광형으로 $NbO^{3-}_4$ 이온의 전하 이동에 의한 넓은 띠의 청색 발광 스펙트럼을 410nm에서 나타낸다. 본 연구에서는 새로운 FED용 청색 및 적색 형광체를 개발하기 위하여 $LaNbO_4$ :X (X = Bi, Eu) 형광체를 합성하였으며, $1250^{\circ}C$에서 2시간 소성한 후 $1400^{\circ}C$에서 1시간 소성하였을 때 최대 발광피크를 얻을 수 있었다. 254nm의 여기하에서 $LaNbO_4$ : Bi는 $420\~450nm$ 영역에서 강한 청색 발광 스펙트럼을 나타내며 첨가된 $Bi^{3+}$ 이온 농도가 $1mol\%$일 때 최대 발광세기를 얻었다 $LaNbO_4$ : Eu의 경우는 첨가된 $Eu^{3+}$ 이온 농도가 $10mol\%$일 때 약 610nm에서 최대 적색 발광 스펙트럼을 나타내고 있다. $Eu^{3+}$ 이온 농도가 $10mol\%$ 이하에서는 $415\~460nm$, $530\~560nm$ 및 $570\~620nm$ 영역에서 피크가 관측되고 있다. 이들 형광체의 음극선 발광특성은 빛 발광 특성과 유사한 경향을 보였다. Rare-earth niobates, ag (Ln = Y, La, Gd) are well-known self-activated phosphors due to charge transfer in $NbO^{3-}_4$ showing a broad and strong emission band in the spectral region around 410 nm. In order to find new blue and red phosphors for FED, $LaNbO_4$ : X (X = Bi, Eu) phosphors are prepared through solid-state reactions at high temperature. The optimum reaction condition for these phosphors to give maximum emission intensity is obtained when it is first fired at $1250^{\circ}C$ for 2 h followed by second firing at $1400^{\circ}C$ for 1 h. Under irradiation at 254 nm, $1mol\%\;Bi^{3+}$ doped $LaNbO_4$ phosphor shows strong blue emission band with a range of $420\~450nm$. Also $10mol\%\;Eu^{3+}$ doped $LaNbO_4$ phosphor shows the maximum emission intensity at about 610 nm. Emission peaks at $415\~460nm$, $530\~560nm$and $570\~620nm$are observed in phosphors below $10mol\%\;Eu^{3+}$ doped $LaNbO_4$. Similar results are obtained in cathodoluminescent property of these phosphors.
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세 가지 구강간호방법에 따른 수술 후 환자의 갈증정도 및 구강상태 비교
김미영(Mi Young Kim),두미정(Mee Jung Doo),강수경(Su Kyeong Kang),임연호(Yean Ho Lim),김현미(Hyun Mi Kim),김미경(Mi Kyoung Kim),온지원(Ji Won On),설혜선(Hye Seon Seol),강정희(Jeong Hee Kang) 한국간호교육학회 2012 한국간호교육학회지 Vol.18 No.3
Purpose: This study compared the effects of three oral care methods on thirst and oral status in patients after general anesthesia surgery. Methods: Sixty five surgical patients were prospectively randomized into three groups. Each group received one of three oral care methods: wet water gauze, frozen water gauze, or frozen normal saline gauze. The outcomes of thirst and oral status were assessed three times by trained investigators blinded to the oral care methods. Assessment times were right after a participant’s arrival to his/her room, and at 30 and 60 minutes after the pre-test. Results: The levels of thirst and oral status were significantly improved as time passed in all three oral care methods. While the level of thirst was not significantly different between the three groups, the level of oral status was significantly better with wet water gauze than frozen gauze groups, soaked in either water or normal saline. Conclusion: We recommend nurses choose one of three oral care methods based on patients’ preferences since all three oral care methods showed similar effects in improving postoperative patients’ levels of thirst and oral status.
ScienceON
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