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CaNb<sub>2</sub>O<sub>6</sub>:RE<sup>3+</sup> (RE= Sm, Eu) 형광체의 광학 특성
정운환,조신호,Joeng, Woon Hwan,Cho, Shinho 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.7
$CaNb_2O_6:RE^{3+}$ (RE=Sm or Eu) phosphor powders were prepared with different contents of activator ions by using solid-state reaction method. The X-ray diffraction patterns exhibited that the phosphors synthesized with different activator ions showed an orthorhombic system with a main (131) diffraction peak. The maximum size of the grain particles, determined from the measurement of scanning electron microscopy, was observed at 0.05 mol of $Eu^{3+}$ ions and at 0.01 mol of $Sm^{3+}$. As for the $Eu^{3+}$-doped phosphor powders, the excitation spectra were composed of a broad band peaked at 278 nm and several weak bands in the range of 350~500 nm, and the highest red emission spectrum was observed at 0.15 mol of $Eu^{3+}$ ions. As for the $Sm^{3+}$-activated phosphor powders, three strong emission bands under excitation at 273 nm were observed at 570, 612, and 659 nm, respectively. The intensities of all the emission bands approached maxima for 0.05 mol of $Sm^{3+}$ ions. The optical properties show that the $Eu^{3+}$- or $Sm^{3+}$-doped $CaNb_2O_6$ powders are promising red-orange emitting phosphor powders applicable to full-color photonic devices.
조원호,이창주,장준동,장호근,이응주,정운환 대한골절학회 1996 대한골절학회지 Vol.9 No.4
'The-fractures in the bumed patients is more complicated mechanism. There are controversies in the treatment of the fractures in the burned patients. We analysed the fracture incidence, the type of burn, the mode of injury. the mean burn percentage. the fracture site and the results of treatment of the 56 fractures in 44 patients selected from 3300 bumed patients in Hangang saeed-heart hospital during recent 5 years. The incidence of the fractures in the bumed patients was 1.3%, the prodominant type of the bum was flame burn(72.7%), the mean bum percentage was 28.7% of the total body surface. The mode of injury mainly consisted of fall down at'ter burn(50%). The most common fracture site was thoracolumber spine(11 cases). In 12 long bone fractures, 5 cases(Tibia:3 case, Femur:2 case] were treated with operative method. But. the osteomyelitis was not developed in all cases. We concluded that the operative treatment is recommended in severe bumed fracture patients for pain relief, comfortable wound manage, rigid fixation and early exercise.