1Department of Physics, Kamla Nehru Mahavidyalaya, Nagpur 440009, India
2Department of Physics, R.T.M. Nagpur University, Nagpur 440033, India
Adv. Mater. Lett., 2021, 12 (2), 21021601
Publication Date (Web): Dec 16, 2020
Copyright © IAAM-VBRI Press
Tb3+/Sm3+ single as well as co-doped LaMgAl11O19 (LMA) phosphors have been synthesized by a low-temperature solution combustion method. The X-ray diffraction pattern, photoluminescence properties and energy transfer (ET) processes between rare earth (RE) ions, were investigated in detail. The mechanism of energy transfer (ET) from Tb3+ to Sm3+ was seen as the dipole–dipole interaction. Efficient ET from Tb3+ to Sm3+ ions was observed, leading to color-tunable emissions of LMA:0.02Tb3+, x Sm3+ (x = 0.005 to 0.02 mol) phosphors. The efficiency of the ET gradually increased with increase in the Sm3+ ion concentration, reaching a maximum of 78.28% at Tb3+ ion concentration 0.02mol. The critical distance (Rc) among sensitizer and activator by the concentration quenching method was estimated to be 27.96 Å. The LMA: Tb3+, Sm3+ phosphors exhibited the emission peaks in the blue (5D3→7FJ = 5, 4, 3, and 2), green (5D4→7FJ = 6, 5, and 4), and orange-red (4G5/2→6HJ = 5/2, 7/2, and 9/2) regions under the excitation wavelength of 375 nm. As a consequence of fine-tuning of the emission composition of the Tb3+ and Sm3+ ions, multicolor emitting luminescence properties can be achieved in a single host lattice LMA.
LaMgAl11O19, luminescence, energy transfer, dipole-dipole interaction, concentration quenching.