Multi-color emission tunability and energy transfer studies of YAl3(BO3)4:Eu3+/Tb3+ phosphors

• Published in: Ceramics international Vol. 40; no. 2; pp. 3399 - 3410
• Main Authors: Reddy, G.V. Lokeswara, Moorthy, L. Rama, Chengaiah, T., Jamalaiah, B.C.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-03-2014
• Subjects: A. Powders: solid state reaction; B. Spectroscopy; C. Optical Properties; Chromaticity; Color; Colour; Display devices; E. Display devices; Emission; Excitation; Luminescence; Phosphors; B. Spectroscopy; A. Powders: solid state reaction; E. Display devices; C. Optical Properties
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2013.09.092

A series of YAB:Eu3+/Tb3+ co-activated phosphors of composition Y(1−x−y)Al3(BO3)4:xEu3+/yTb3+ (x=0, 0.3, 0.5, 1, 2% and y=0.5%) were prepared by solid-state reaction method and their photoluminescence properties were characterized. Eu3+/Tb3+ co-doped phosphors have shown their excellent luminescent properties in their respective emission regions. The YAB:2%Eu3+ phosphor under 395nm excitation exhibited red luminescence with Commission International de I'Eclairagein chromaticity coordinates (x=0.627, y=0.334) which are close to an ideal red and commercial Y2O3:Eu3+ red phosphor chromaticity coordinates. The emission color of Eu3+/Tb3+ co-doped phosphors has been tuned from pale-green to white as a function of Eu3+/Tb3+ concentration. Moreover, the Tb3+ acts as an efficient sensitizer and enhances the luminescence of Eu3+ by transferring absorbed excitation energy. The overlapping 7F0→5D3,2,1,0(Eu3+); 7F1→5D1,0(Eu3+); 7F2→5D1(Eu3+) excitation and 5D3→7F5,4,3 (Tb3+); 5D4→7F5,4(Tb3+) emission transitions revealed the transfer of energy from Tb3+ to Eu3+ through exchange interaction mechanism in Eu3+–Tb3+ clusters instead of from these ions randomly distributed in YAB lattice. The YAB:Eu3+/Tb3+ phosphors have potential in the field of display technology.