# CIRCULARLY POLARIZED LUMINESCENCE OF $Eu^{3+}$ AND $Tb^{3+}$ IN AN OPTICALLY ACTIVE CRYSTAL

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 Title: CIRCULARLY POLARIZED LUMINESCENCE OF $Eu^{3+}$ AND $Tb^{3+}$ IN AN OPTICALLY ACTIVE CRYSTAL Creators: Morley, J. P.; Faulkner, Thomas R.; Richardson, F. S. Issue Date: 1979 Publisher: Ohio State University Abstract: Circularly polarized luminescence (CPL) and total luminescence (TL) spectra are reported for the intra-f-shell $^{7}{F_{J}} \leftarrow ^{5}{D_{J}}$ transitions of $Eu^{3+}$ and of $Tb^{3+}$ in crystalline $Na_{3}Ln(C_{4}H_{4}O_{5})_{3}\cdot 2NaClO_{4}\cdot 6H_{2}O$, where $Ln=Eu^{3+}$ or $Tb^{3+}$. The lanthanides in this system are each 9-coordinate with each tris(tridentate) $Ln(C_{4}H_{4}O_{5})_{3}$ complex having exact trigonal dihedral ($D_{3}$) symmetry. At room temperature the crystals are trigonal (space group $R32^{2}$) with three $Ln(C_{4}H_{4}O_{5})_{3}$, species per unit cell. The $^{7}{F_{J}} \leftarrow ^{5}{D_{J}} Eu^{3+}$ and $Tb^{3+}$ transitions in this system exhibit very strong optical activity (as observed by CPL) reflecting unit cell dissymmetry as well as inherent chirality within each $Ln(CH_{4}O_{5})_{3}$ species. Temperature dependent CPL and TL measurements suggest a phase transition occurs in the crystal at about 110K. Description: Author Institution: URI: http://hdl.handle.net/1811/10819 Other Identifiers: 1979-MG-11