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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.
최적설계 및 동역학 해석 기반의 SMD 릴 뱅크 로봇 개발
김병수(ByeongSoo Kim),조지승(CheSeung Cho),김진대(JinDae Kim),이재익(JaeIk Lee),이상화(SangHwa Lee) (사)한국CDE학회 2015 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2015 No.동계
This study aims at developing a loading warehouse robot to supply and discharge an SMD reel automatically in an effort to supplement disadvantages where much time is required for searching and managing parts in the SMT production environment. An SMD reel bank robot supplies multiple reels at once, classified the reel type and size automatically, and loads them to a desired position. It automatically recognizes barcodes on reels with its vision system installed to a reel inserting opening, increases the production efficiency through managing the production history and product stocks, and enables the history management for stocks. In order to develop a reel bank robot, it is necessary to increase the completeness of the developed product with the shortened product development time by verifying its design through the optimal design and analysis for the reel conveyance module gripper.