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Photoluminescence and energy transfer studies of YAl3(BO3)4:Sm3+/Tb3+ phosphors for solid state lighting applications

G. V. LOKESWARA REDDY1, L. RAMA MOORTHY1,2, K. PAVANI1, B. C. JAMALAIAH1,3,*

Affiliation

  1. Department of Physics, Sri Venkateswara University, Tirupati 517 502, India
  2. Department of Physics, Chadalawada Venkata Subbaiah Engineering College, Tirupati 517 506, India
  3. Department of Materials Engineering and Ceramics, CICECO, University of Aveiro, Campus Santiago, 3810-193 Aveiro, Portugal

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 I’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

Yttrium-borate phosphors, Photoluminescence, Energy transfer, Solid state lighting.

Citation

G. V. LOKESWARA REDDY, L. RAMA MOORTHY, K. PAVANI, B. C. JAMALAIAH, Photoluminescence and energy transfer studies of YAl3(BO3)4:Sm3+/Tb3+ phosphors for solid state lighting applications, Optoelectronics and Advanced Materials - Rapid Communications, 7, 9-10, September-October 2013, pp.712-719 (2013).

Submitted at: June 25, 2013

Accepted at: Sept. 18, 2013