@article { author = {Puppalwar, S.P. and Mendhe, M.S. and Dhoble, S.J.}, title = {Solution Combustion Synthesis and Energy Transfer in LaMgAl<sub>11</sub>O<sub>19<sub>:Tb<sup>3+</sup>/Sm<sup>3+</sup> Tunable Phosphor}, journal = {Advanced Materials Letters}, volume = {12}, number = {2}, pages = {1-6}, year = {2021}, publisher = {International Association of Advanced Materials}, issn = {0976-3961}, eissn = {0976-397X}, doi = {10.5185/amlett.2021.021601}, abstract = {Tb 3+ /Sm 3+ 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&ndash;dipole interaction. Efficient ET from Tb3+ to Sm3+ ions was observed, leading to color-tunable emissions of LMA:0.02Tb3+ , x Sm 3+ (x = 0.005 to 0.02 mol) phosphors. The efficiency of the ET gradually increased with increase in the Sm 3+ 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 &Aring;. The LMA: Tb3+ , Sm3+ phosphors exhibited the emission peaks in the blue ( 5D3&rarr; 7FJ = 5, 4, 3, and 2), green ( 5D4&rarr; 7FJ = 6, 5, and 4), and orange-red ( 4G5/2&rarr; 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.}, keywords = {LaMgAl11O19,luminescence,energy transfer,dipole,dipole interaction,concentration quenching}, url = {https://aml.iaamonline.org/article_14046.html}, eprint = {https://aml.iaamonline.org/article_14046_ac5c000f47aae56729459766db4af033.pdf} }