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Synthesis of blue-emitting (K1−xNax)Mg4(PO4)3:Eu2+ phosphors
김선욱,Takuya Hasegawa,Tadashi Ishigaki,Kazuyoshi Uematsu,Mineo Sato,Kenji Toda 한국정보디스플레이학회 2014 Journal of information display Vol.15 No.2
Blue-emitting (K1−xNax)Mg4(PO4)3:Eu2+ phosphors were synthesized through a conventional solid-state reaction method, and their photoluminescence properties were characterized. These phosphors exhibited the typical emission band assigned to the transition from 4f65d1 to 4f7 of Eu2+, and the emission intensity was effectively enhanced by Na+-doping into the host lattice. The highest blue emission peak intensity was obtained for (K0.65Na0.35)Mg4(PO4)3:1 mol%Eu2+, where the relative emission peak intensity was 33% of that for the commercial blue-emitting BaMgAl10O17:10 mol%Eu2+ phosphor. In addition, these phosphors have excellent thermal stability in the temperature quenching effect.
唐代 蕃鎭에 關한 考察 : 鎭을 中心으로 Especially on Chin
金善昱 忠南大學校 1972 論文集 Vol.11 No.-
As the militia (Fu-Ping) system of early T'ang collapsed after Hsu¨anTsung's rein. the domintion of the fontier regional commandaries was brought about. The essense of These regional commanderies is Chin. Chin consisted of officers and soldiers and as its officers there wee regional commander, Vice-commander Pubyungmasa Abeo Tohohu and Sibjang. On account of the collapse of the militia (Fu-Ping) system, the constituents of Chin were professional soldiers and militias. It can be said the difference between Proffessional soldier and militia is that the one is the government forces and the other the militiaman The leadership of the regional commanders played a very important role in military affairs, It was reduced to some extent by HunTsung's reformation, but the reformation was not successful Provincial military leaders posted regional commanders and soldiers and soldiers in strategic places, so that the expansion of their power came to be possible by force of arms. Thus provincial military leaders took advantage of regional commanders for the strengthening of their power.