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김경화,박종규,박희동,한정화,Kim, Gyeong Hwa,Park, Jong Gyu,Park, Hui Dong,Han, Jeong Hwa 대한화학회 2001 대한화학회지 Vol.45 No.6
YOB에 $Eu^{3+}$를 첨가하여 고상 반응으로 합성하였다. YOBr: $Eu^{3+}$ 형광체는 621nm에서 강한 적색 발광을 보이며, $Eu^{3+}$이온 농도가 0.05mol일 때 외대 발광 휘도를 나타냈다. 이때, 적색 발광을 유발하는 전이는 $^5D_0{\to} ^7F_2$ 이며, $Eu^{3+}$이온의 농도에 따른 발광 스펙트럼과 잔광시간 곡선을 통해 YOBr: $Eu^{3+}$형광체의 PL거동을 규명하였다. Inokuti-Hirayama식으로 잔광시간 곡선을 fitting 한 결과, YOBr내의 $Eu^{3+}$간 다중 극자 상호작용 유형(multipolar interaction)은 쌍극자-쌍극자 상효작용(dipole-dipole interaction)으로 밝혀졌다. 또한 본 연구에서는 임계거리를 구하기 위해 임계농도에 의한 계산 외에도 Inokuti-Hirayama식으로부터 fitting한 C/$C_0$값으로 구하는 방법과 $Eu^{3+}$의 여기 및 발광 스펙트럼으로 spectral overlap하여 임계거리를 구하고자 시도 하였다. 각각의 방법으로 구한 임계거리는 17.30, 10.51 및 7.18$\AA$으로 약간의 편차를 보이지만 대략적인 크기를 갖고 있어, 이는 계산이나 측정상의 오차를 감안하면 모두 임계거리를 구하는 유용한 방법으로 판단된다. The europium doped yttrium oxybromide phosphors were synthesized by solid-state reaction method. The YOBr: $Eu^{3+}$ phosphor showed a strong and narrow red emission band at 621 nm and maximum emission intensity obtained when 0.05 mol Eu ions were doped. The red emission of $Eu^{3+}$ originated from $^5D_0$ ${\rightarrow}$ $^7F_2$electric dipole transition. In order to investigate on photoluminescence behavior, several experimental skills and numerical fittings are conducted to the YOBr: $Eu^{3+}$ phosphor. The emission spectrum was measured in the UV range and then decay curve of $^5D_0$ ${\rightarrow}$ $^7F_j$transitions was examined. The energy interaction type of YOBr: $Eu^{3+}$ phosphor was dipole-dipole interaction. In addition to the calculating by critical concentration, the critical distance ($R_0$) was calculated by decay curve fitting parameter from Inokuti-Hirayamas equation, and spectral overlap method. The critical distance was 17.03, 10.51 and 7.18$\AA$ for those methods, respectively. As considering systematic error of measurements, these values are within the same order, so that the above fitting methods are plausible and recommendable.
김경화 ( Gyeong Hwa Kim ),진형여 ( Hyung Yeo Jin ) 한국미용학회 2012 한국미용학회지 Vol.18 No.5
Art make-up, a plastic art which uses human body as a tool, creates a new visual art through visual transformation of human body for aesthetic desires. Eyes with which human perceives objects cause an optical illusion that differs from reality. An optical illusion is included in most of the plastic arts, and as a motif of visual art, this affects creation and inspiration caused by various illusions of visual transformation on human body. For this research, theoretical consideration was conducted on the two following characteristics of the contemporary plastic arts: (1) experimental, free formativeness, and (2) a definition of illusion therein presented. According to an aesthetic expression reinterpreted as illusion through artists and works of the plastic arts, and cases on advertising images using illusion and work integrated into illusion applied to human body, illusion creates a new factor, and through which aesthetic characteristics based on, ideas can be conveyed by conversing them in a three-dimension, not one-dimension way. Therefore, this significance of this study which the researcher looked, the study of illusion and positive experimental mind are required for painting space and formative space, through this research can be created the possibility of the development with art and creative design by using illusion, factors consisting of illusion convey visual characteristics, aesthetic sense, and inner desire, serving as all arts and communication to look forward.