title: Enhanced green emission from Er2WO6 nanocrystals embedded composite tellurite glasses.
abstract: A series of tungsten-tellurite glasses activated with different concentrations (0-1.5 mol%) of Er(3+) has been synthesized. The structural properties of the best luminescent sample and the optical properties of its Er(3+) ions, are studied both immediate after its preparation as well as after its ageing. On ageing the glass suffers structural reorganization and generates Er(2)WO(6)-nanocrystals in the matrix, which greatly enhances the normal and upconversion green luminescence efficiency of Er(3+). The nanocrystal aided enhancement of normal and upconversion luminescence of Er(3+) of the glass has been attributed to the crystal field effects of the new environment of Er(3+) in the nanocrystals. A phenomenon of preferential enhancement of red upconversion luminescence at the cost of green upconversion luminescence of Er(3+) at its higher concentrations in the glass has been observed and the related photo-physics is proposed. The material shows the prospect of being used as NIR solar concentrator.
authors.affiliation: Central Glass and Ceramic Research Institute (CGCRI), Council of Scientific and Industrial Research (CSIR), 196, Raja S. C. Mullick Road, Kolkata 700 032, India. sbalaji@cgcri.res.in
authors.forename: Sathravada
authors.initials: S
authors.lastname: Balaji
authors.forename: Dipten
authors.initials: D
authors.lastname: Misra
authors.forename: Radhaballabh
authors.initials: R
authors.lastname: Debnath