resumo
The radiative emission properties of the Dy3+ ions in oxyfluoride glasses and glass ceramics have been investigated for the generation of white light. The X-ray diffraction pattern of the glass ceramics reveals the presence of NaAlSiO4 nanocrystals along with secondary phase of NaY9Si6O26 in the glass matrix after a suitable thermal treatment of the pristine glasses. Intense white light emission has been observed when the samples are excited with 350 nm light. Yellow to blue emission intensity ratios and chromaticity color coordinates have been determined from the visible luminescence spectra. All color coordinates are found to lie in the white region of the chromaticity color diagram proposing the suitability of the present studied materials for color display devices. (C) 2012 Elsevier B.V. All rights reserved.
palavras-chave
OXYFLUORIDE GLASS; PHOTOLUMINESCENCE PROPERTIES; LUMINESCENCE PROPERTIES; LED APPLICATIONS; PHOSPHORS; DY3+; CONVERSION; EMISSION; TB3+; ER3+
categoria
Materials Science; Physics
autores
Bagga, R; Achanta, VG; Goel, A; Ferreira, JMF; Singh, NP; Singh, DP; Falconieri, M; Sharma, G
nossos autores
José Maria da Fonte Ferreira
Professor(a) Jubilado(a)agradecimentos
This work was financially 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 Mr. Nilesh Kulkarni and Ms. B.A. Chalke, TIFR, Mumbai for help with XRD and SEM measurements. The support from CICECO, Portugal is greatly acknowledged.