title: Design of luminescent inorganic materials: new photophysical processes studied by optical spectroscopy.
abstract: Recent spectroscopic results in the emerging area of transition-metal NIR-to-visible upconversion are related. The examples of Ti(2+)-, Re(4+)-, and Os(4+)-doped materials showing upconversion illustrate GSA/ESA, GSA/ETU, and photon avalanche multiphoton excitation mechanisms, respectively. Strategies for manipulation of such upconversion processes using the spectroscopic or magnetic properties of the host material are described. High-resolution low-temperature continuous-wave absorption and emission and time-resolved emission experiments combine to yield information about energy splittings, intensities, and excited-state dynamics, and assist in the design and development of luminescent materials showing novel multiphoton excitation properties.
authors.affiliation: Department of Chemistry, University of Bern, Freiestrasse 3, CH-3000 Bern 9, Switzerland.
authors.forename: D R
authors.initials: DR
authors.lastname: Gamelin
authors.forename: H U
authors.initials: HU
authors.lastname: Güdel
mesh_terms: D007287:Inorganic Chemicals / Q000737:chemistry*; D008163:Luminescent Measurements; D010777:Photochemistry; D013053:Spectrophotometry
chemical_list: D007287:Inorganic Chemicals