abstract
Trivalent samarium (Sm3+)/terbium (Tb3+) co-doped YAl3(BO3)(4) (YAB) phosphors were prepared by solid-state reaction method. The phase, structure, optical and energy transfer studies were systematically characterized through X-ray diffraction, Fourier transform infrared spectroscopy, photoluminescence (PL) and decay measurements, respectively. Upon 406 nm excitation, both Sm3+ single- and Sm3+/Tb3+ co-doped YAB phosphors emit orange-red luminescence with peak maximum at 602 nm. The YAB:Tb3+ phosphor emits green luminescence at 546 nm when excited with 375 nm near UV wavelength. The YAB:Sm3+/Tb3+ phosphors emit green-to-white luminescence as a function of Sm3+ concentration upon an excitation wavelength of 375 nm. The Tb3+ acts as an efficient sensitizer of luminescence of Sm3+ under 375 nm excitation in YAB phosphors. Doped Sm3+ and Tb3+ ions were located at the inversion symmetry sites of YAB lattice. The Commission International de l'Eclairage chromaticity coordinates were calculated from the PL spectra. The energy transfer from Tb3+ to Sm3+ ions was described in detail. The YAB:Sm3+/Tb3+ phosphors can be used as a promising material for solid state lighting devices.
keywords
LANTHANIDE AQUO IONS; LUMINESCENCE PROPERTIES; ZNO NANOPOWDER; X-RAY; GLASSES; EMISSION; EXCITATION; SYSTEM; TB3+; XRD
subject category
Materials Science; Optics
authors
Reddy, GVL; Moorthy, LR; Pavani, K; Jamalaiah, BC
our authors
Bungala Chinna Jamalaiah
Post-doc FellowshipGroups
acknowledgements
One of the authors Dr. B.C. Jamalaiah would like to thank the Fundacao para a Ciencia e a Tecnologia (FCT), Ministerio da Educacao e Ciencia, PORTUGAL for supporting him as a Post-Doctoral Researcher wide Ref. No. SFRH/BPD/76581/2011.