Zaitoun Mohammed
Chemistry Department, Mutah University, P. O Box 7, Karak, Jordan.
Appl Spectrosc. 2006 Apr;60(4):418-22. doi: 10.1366/000370206776593726.
In comparing emissions of the inorganic Eu3+ salts (chloride or nitrate) to organoeuropium complexes doped into optically transparent sol-gel glass, previous studies have indicated that changes in the local chemical environment by chelation or variation of the ligand or gel matrix compositions were found to leave the main spectral features of Eu3+ essentially unchanged; complexation just increases the emission intensity of europium and leads to broadening and splitting of the peaks. In all cases studied and irrespective of the excitation energy, the observable emission peaks result only from relaxations out of the 5D0 excited state of Eu3+ to the first five levels of the 7F ground manifold. The present research examines the luminescence behavior of EuCl3 and Eu-TETA (TETA is the macro cycle, 1,4,8,11-tetraazacyclotetradecane-1,4,8,11-tetraaceticacid) doped into a sol-gel host; in addition to emissions from the 5D0, emission from the 5D1 excited state of Eu3+ is observed for the first time.
在比较无机铕（III）盐（氯化物或硝酸盐）与掺杂在光学透明溶胶 - 凝胶玻璃中的有机铕配合物的发射时，先前的研究表明，通过螯合、改变配体或凝胶基质组成所引起的局部化学环境变化，被发现基本不会改变铕（III）的主要光谱特征；络合作用只是增加了铕的发射强度，并导致峰的展宽和分裂。在所有研究的情况下，无论激发能量如何，可观察到的发射峰仅来自于铕（III）的5D0激发态到7F基态多重态的前五个能级的弛豫。本研究考察了掺杂在溶胶 - 凝胶主体中的EuCl3和Eu - TETA（TETA是大环，1,4,8,11 - 四氮杂环十四烷 - 1,4,8,11 - 四乙酸）的发光行为；除了来自5D0的发射外，首次观察到了铕（III）的5D1激发态的发射。
