X-ray luminescence properties of LiLa1−xNdxP4O12 nanocrystals: Concentration and size effects

• X-ray luminescence of LiLa1−xNdxP4O12 nanocrystals were investigated.
• The influence of size of nanocrystals on X-ray luminescence is presented.
• The impact of Nd3+ concentration on X-ray luminescence is analyzed.

X-ray luminescence properties of LiLa1−xNdxP4O12 nanocrystals were investigated for the first time. The influence of the Nd3+ concentration on the integral emission intensities in visible and near infrared emission region were investigated. It was found that emission from 2F(2)5/2 is strongly affected by cross-relaxation process and its intensity decreases exponentially with Nd3+ amount, while emission from 4F7/2 + 4S3/2, 4F5/2 + 2H11/2, and 4F3/2 states rises up sublinearly with Nd3+ concentration. The size effect on emission spectra under X-ray excitation was presented.