Luminescence study of mixed valence Eu-doped nanocrystalline glass-ceramics

resumo

Eu-doped nanocrystalline NaAlSiO4/NaY9Si6O26 glass-ceramics have been prepared by controlled crystallization of melt quenched bulk glasses. XRD, SEM and FTIR spectroscopy techniques were employed to characterize the crystallization process and the structural properties of the precursor glass and corresponding glass-ceramics. The formation of divalent europium (Eu2+) from Eu3+ ions during high temperature synthesis under ambient atmosphere was analyzed by photoluminescence spectroscopy and is discussed using the optical basicity model. The observed luminescence properties of Eu: NaY9Si6O26 are compared with that of Eu: beta-PbF2 nanocrystals and their marked differences are discussed. (C) 2013 Elsevier B.V. All rights reserved.

palavras-chave

STRUCTURAL INVESTIGATIONS; OXYFLUORIDE GLASSES; FLUORIDE GLASSES; TRANSPARENT; PHOSPHORS; IONS; BLUE; AIR; PHOTOLUMINESCENCE; SPECTROSCOPY

categoria

Materials Science; Optics

autores

Bagga, R; Achanta, VG; Goel, A; Ferreira, JMF; Singh, NP; Singh, DP; Contini, V; Falconieri, M; Sharma, G

nossos autores

agradecimentos

This work was supported by University Grants Commission of India (Grant No. F. No. 35-3/2008 (SR)) and ICTP, Italy (Grant No. 421.ENEA). The authors would like to thank Dr. Vivek Malik for SEM measurements.

Partilhe este projeto

Publicações similares

Usamos cookies para atividades de marketing e para lhe oferecer uma melhor experiência de navegação. Ao clicar em “Aceitar Cookies” você concorda com nossa política de cookies. Leia sobre como usamos cookies clicando em "Política de Privacidade e Cookies".