resumo
A series of YAl3(BO3)(4) phosphors doped with different concentrations of Dy2O3 (0.1 <= x <= 5 mol%) were prepared by solid-state reaction method. The crystallization process of the precursor has been examined by differential thermal analysis (DTA) measurements. The phase purity and surface morphological features were characterized by X-ray diffraction (XRD) and scanning electron microscopic (SEM) investigations. The YAl3(BO3)(4) nanocrystals obtained were found to be about 45 nm in size and have the trigonal structure with some agglomeration. Fourier transform infrared (FTIR) and energy dispersive X-ray spectra (EDS) measurements were carried out to understand the compositional and elemental analysis. The characteristics emission peaks of Dy3+ ion corresponding to the transitions of F-4(9/2)-> H-6(15/2) at 485 nm and F-4(9/2)-> H-6(13/2) at 576 nm were observed in the emission spectra. The luminescence quenching noticed at higher Dy203 concentrations is due to the exchange interaction among the excited Dy3+ ions. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
palavras-chave
HYDROTHERMAL SYNTHESIS; EMITTING-DIODES; ENERGY-TRANSFER; RED PHOSPHORS
categoria
Materials Science
autores
Reddy, GVL; Moorthy, LR; Jamalaiah, BC; Sasikala, T
nossos autores
Bungala Chinna Jamalaiah
Bolseiro de pós-DoutoramentoGrupos
agradecimentos
One of the authors Prof. L. Rama Moorhy would like to thank the Council of Scientific and Industrial Research (CSIR), New Delhi, India for sanction of financial support in the form of major research projects no. 03(1224)/12/EMR-II.