Site selected excitation of Sm2+ in substitutional disordered crystal KLaF4

Ito, Kiyotaka; Yamaga, M.; Kodama, Nobuhiro

doi:10.1016/j.jallcom.2005.01.089

Cited by 3 publications

(1 citation statement)

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“…Mixed crystalline fluorides are becoming interesting because of the multisite nature of the crystalline lattice, meaning that RE ions can occupy various non-equivalent sites in the lattice; examples include LiYF 4 :Sm 3z , 140 KLaF 4 :Sm 3z , 141 NaLaF 4 :Ln 3z (Ln5Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm) 142 and NaLaF 4 :Er 3z . 143 The location of the energy levels of lanthanides ions by photoand thermo-luminescence were studied in NaGdF 4 :Tm 3z , NaGdF 4 :Nd 3z , NaLaF 4 :Tm 3z and NaLaF 4 :Nd 3z , 144 and NaYF 4 :Ln 3z .…”

Section: Luminescence Uc and DC In Fluoride Glasses And Crystalsmentioning

confidence: 99%

Nanocrystallisation in oxyfluoride systems: mechanisms of crystallisation and photonic properties

Pablos-Martín

Durán

Pascual

2012

International Materials Reviews

154

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Rare earth (RE) doped oxyfluoride glass ceramics possess interesting optical properties with applications in telecommunications and optoelectronics, such as solid state lasers, optical amplifiers, etc. These materials combine the transparency and mechanical and chemical resistance of aluminosilicate glasses with the low phonon energy and facile incorporation of RE ions in the fluoride crystals. The incorporation of RE ions in the crystalline phases enhances the laser emission intensity, a major property of these materials. Transparency is achieved when crystal size is in the nanometric scale, usually below 40 nm, which avoids light scattering. A strict control of the nucleation and crystal growth processes is therefore necessary which requires a deep knowledge of the crystallisation mechanisms. The great activity and publications in this field in the last decades merit a review providing a comparative study of the different nanoglass ceramic systems, their structural and optical characterisation and their main properties and applications. This is the objective of this review paper which includes 232 references. A general discussion on glass nucleation and crystallisation theories and more relevant crystallisation parameters and characterisation techniques are put forward in the first section of the review, focused on nanocrystallisation processes in oxyfluoride systems. In the second section, the principal RE doped glass ceramics are presented. After a general introduction about the luminescence processes, including up-and down-conversion, the behaviour of RE elements in glasses and crystals are discussed. Glass ceramic compositions have been divided as follows: glass ceramics with a glass composition following Wang and Ohwaki's oxyfluoride glass ceramic, 1 ; and glass ceramics with different matrix compositions, arranged by crystalline phases. Relevant properties, mainly optical and laser, are described in each system along with the most relevant applications of these materials.

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