Fig. 6.

(a) DUV-excited luminescence of nuclei of cells treated with Tb³⁺, Eu³⁺, or Tm³⁺. (b-d) Luminescence intensity distribution of cells treated with (b) Tb³⁺, (c) Eu³⁺, and (d) Tm³⁺. (b) was reconstructed by the luminescence band at λ = 545 nm, while (c), and (d) were reconstructed at λ = 590, and 455 nm, where Eu³⁺, and Tm³⁺, when excited with proper wavelengths, should have an emission line, respectively^35,42. The scale bar is 10 µm. The arrow indicates the second-order diffraction light of the laser line (λ = 257 nm), at λ = 514 nm.