Line emission of lanthanide ions (f–f transitions)
Each Ln³⁺ emits a few very narrow lines because the 4f electrons are shielded from the environment. Eu³⁺ red, Tb³⁺ green, Tm³⁺ blue: the basis of tricolour phosphors.
Each Ln³⁺ emits a few very narrow lines because the 4f electrons are shielded from the environment. Eu³⁺ red, Tb³⁺ green, Tm³⁺ blue: the basis of tricolour phosphors.