Klaus Wussow

Gallium Complexes in Three‐Layer Organic Electroluminescent Devices

Organic light-emitting diodes fabricated by subsequently spin-coating two layers-a hole-transporting followed by a metal chelate emissive layer - onto poly(3,4-ethylene-dioxythiophene)/poly(styrenesulfonate) are presentedfor the first time. The electron-hole recombination occurs in a layer consisting of Ga complexes (see Figure), which exhibit high fluorescence quantum yields, and their emission spectra are blue-shifted relative to that of tris(8-hydroxyquinoline) aluminum. By doping this spin-coated emission layer with fluorescent emitters the emission band can be shifted within the visible spectral range.

Ionic Conductivity, Structural, IR and Raman Spectroscopic Data of Olivine, Sr2PbO4, and Na2CuF4 Type Lithium and Sodium Chlorides Li2ZnCl4 and Na2MCl4 (M = Mg, Ti, Cr, Mn, Co, Zn, Cd)

The ionic conductivities (complex impedance measurements) of the olivine type Li2ZnCl4, Na2ZnCl4 and Na2CoCl4, the Sr2PbO4 type Na2MgCl4, Na2MnCl4, and Na2CdCl4, and the novel Na2CrCl4 with monoclinically distorted Sr2PbO4 structure (Na2CuF4 type) are presented. The specific conductivities of Li2ZnCl4 and the Na2MCl4 are about three orders of magnitude lower than those of the fast ionic conducting lithium chloride spinels Li[LiM ]Cl4 (M = Mg, Mn. Fe. Cd. etc.) indicating that in the latter compounds the tetrahedrally coordinated lithium ions exhibit higher mobility than those on octahedral sites. The X-ray data including those of Sr2PbO4 type Na2TiCl4 and both the IR and Raman spectra (together with a group theoretical treatment) are also given. The spectra obtained confirm the different structure types of the ternary chlorides.