Luminescence properties of thin films prepared by laser ablation of Nd-doped potassium gadolinium tungstate

Citation
Pa. Atanasov et al., Luminescence properties of thin films prepared by laser ablation of Nd-doped potassium gadolinium tungstate, APPL PHYS A, 74(1), 2002, pp. 109-113
Citations number
23
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
ISSN journal
09478396 → ACNP
Volume
74
Issue
1
Year of publication
2002
Pages
109 - 113
Database
ISI
SICI code
0947-8396(200201)74:1<109:LPOTFP>2.0.ZU;2-G
Abstract
Optically active thin films on Si substrates have been produced by laser ab lation of a Nd-doped potassium gadolinium tungstate (Nd:KGW) single crystal . Films grown at low oxygen pressures (< 0.6 mbar) are potassium-deficient and appear to be mainly disordered. They show a poor photoluminescence (PL) performance that improves upon annealing in air at temperatures in the ran ge 700-1000 degreesC. Films grown at high oxygen pressure (1 mbar) show ins tead good stoichiometry and the presence of a dominant textured gadolinium- tungstate phase compared to KGW. These films have low absorption, a refract ive index close to that of bulk KGW and good PL performance, the emission l ifetimes being longer (tau > 150 mus) under certain conditions than those m easured in the single-crystal material.