Controlling luminescence colour through concentration of Dy3+ ions in LiLa1−xDyxP4O12 nanocrystals

Abstract

Luminescence and excitation spectra of LiLa_1−xDy_xP₄O₁₂ nanocrystals are reported. In particular, the impact of dopant concentration on the luminescence properties of LiLa_1−xDy_xP₄O₁₂ nanocrystals was investigated. It was found that increase in Dy³⁺ concentration results in a strong quenching of luminescence. The mechanism of concentration quenching was discussed in terms of the Yokota–Tanimoto model. It is concluded that with increasing Dy³⁺ concentration, the donor–acceptor interaction leads to a significant concentration quenching resulting in nonexponential luminescence decay, whereas at a high concentration limit the donor–donor interaction becomes dominant and exponential decay is observed.