Luminescence characteristics of a novel Tm/Eu co-doped polychromatic tunable phosphor

A group of LaAl2.03B4O10.54:xTm(3+), yEu(3+) phosphors were prepared by sol-gel method. The phase composition, luminescence characteristics, fluorescence lifetime and energy transfer mechanism were revealed by XRD patterns and the luminescence spectrum. Through luminescence spectrum and fluorescence lifetime, it is found that there is energy transfer phenomenon between Tm3+ and Eu3+ ions, and the efficiency of energy transfer raises with the rise of Eu3+ ions concentration, reaching 57.5% when Eu3+ ions concentration is 18 mol%. By calculating the critical distance (R-C) and linearly fitting the data, it can be concluded that the mechanism of energy transfer is defined as dipole-dipole interaction. In pace with the change of Tm3+/Eu3+ doped concentration, the color coordinate region of these samples passes from blue light to purple light, pink light and finally to red light. These results clearly indicate that LaAl2.03B4O10.54:xTm(3+),yEu(3+) phosphors can be used as single-matrix polychromatic tunable phosphors in the field of WLEDs.

Automated summary

A series of LaAl2.03B4O10.54:xTm(3+), yEu(3+) phosphors were prepared by sol-gel method, showing an increase in energy transfer efficiency with higher concentration of Eu3+ ions. The energy transfer mechanism was identified as dipole-dipole interaction. The color coordination of the samples shifted from blue light to purple, pink, and red light as the concentration of Tm3+/Eu3+ dopants changed.