Recent progress on optical properties of double perovskite phosphors

The double perovskite phosphor materials are physically, chemically and thermally stable in nature. The generalized formula of double perovskite is AA'BB'O₆ type. The transition metal and lanthanide ions can be doped in the double perovskite materials. The structure of perovskite materials is the key factor for optical properties of the phosphor materials. The transition metal ions produce broad emission band covering from near blue to NIR regions. They can even produce white light. Some combinations of transition metal ions show the energy transfer between them. On the other hand, the lanthanide ions emit sharp and narrow band emissions from UV to NIR regions because their transitions are not affected by the outer environment due to the shielding effect. The combinations of transition metals and lanthanide ions also involve in the energy transfer. This article comprises the recent development on the optical properties of transition metal (Mn⁴⁺) and lanthanide metal (Eu³⁺) doped double perovskite phosphor materials. The optical processes involved in photoluminescence have been discussed in detail. The applications of transition metal and lanthanide doped and co-doped double perovskite phosphor materials have also been summarized herein.