Correlated electronic structure and optical response of rare-earth based semiconductors

Synthesis, structure and optical properties of rare-earth benzene carboxylates.

Two series of rare-earth isophthalates of the general formula, [M(2)(H(2)O)][{C(6)H(4)(COO)(2)}(2){C(6)H(4)(COOH)(COO)}(2)].H(2)O, M=La (I), Pr (Ia), and Nd (Ib) and [M(2)(H(2)O)(2)][{C(6)H(4)(COO)(2)}(3)].H(2)O, M=Y (II), Gd (IIa), and Dy (IIb) have been prepared by the reaction of the corresponding trivalent lanthanide salts and isophthalic acid under mild hydrothermal conditions. The La (I),...

Rare Earth doped Semiconductors for Phosphors and Lasers

The emission properties of rare earth (RE)-doped GaN are of significant current interest for applications in full color displays, white lightingtechnology, and optical communications. We are currently investigating the photoluminescence (PL) properties of RE (Er, Eu, Tm)-dopedGaN thin-films prepared by solid-source molecular beam epitaxy. The most intense visible PL under above-gap exci...

Rare-Earth Doped Optical Fibers

An optical fiber becomes active by doping its core with one or more atomic elements, usually (but not restricted to) rare-earths (RE’s), more specifically, the lanthanides that occupy the atomic numbers 57 to 71 of the periodic table. As it will be mentioned later in more detail, they use three electrons in bonding to the condensed materials such as crystals and glasses to become triply ionized...

Cluster calculations of rare-earth ions in semiconductors.

The Electronic Structure and Optical Properties of Anatase TiO2 with Rare Earth Metal Dopants from First-Principles Calculations

The electronic and optical properties of the rare earth metal atom-doped anatase TiO₂ have been investigated systematically via density functional theory calculations. The results show that TiO₂ doped by Ce or Pr is the optimal choice because of its small band gap and strong optical absorption. Rare earth metal atom doping induces several impurity states that tune the location of valence and co...