Editing Phosphor (section)

====Projection televisions====
For [[projection television]]s, where the beam power density can be two orders of magnitude higher than in conventional CRTs, some different phosphors have to be used.

For blue color, {{chem2|ZnS:Ag,Cl}} is employed. However, it saturates. {{chem2|(La,Gd)OBr:Ce,Tb(3+)}} can be used as an alternative that is more linear at high energy densities.

For green, a [[terbium]]-activated {{chem2|Gd2O2Tb(3+)}}; its color purity and brightness at low excitation densities is worse than the zinc sulfide alternative, but it behaves linear at high excitation energy densities, while zinc sulfide saturates. However, it also saturates, so {{chem2|Y3Al5O12:Tb(3+)}} or {{chem2|Y2SiO5:Tb(3+)}} can be substituted. {{chem2|LaOBr:Tb(3+)}} is bright but water-sensitive, degradation-prone, and the plate-like morphology of its crystals hampers its use; these problems are solved now, so it is gaining use due to its higher linearity.

{{chem2|Y2O2S:Eu(3+)}} is used for red emission.<ref name="lumdisp"/>