Figure 4

Fluorescence performance.

a, The excitation and emission spectra of NLM:Eu³⁺. b, The excitation and emission spectra of NLM:Tb³⁺. c, The excitation and emission spectra of NLM:2% Eu³⁺/3% Tb³⁺. d, CIE chromaticity diagram for the emission spectra of the above three samples.