Tailoring the photoluminescent properties of samarium and dysprosium codoped calcium zirconate perovskites for WLED applications

Abstract This study investigates the photoluminescent properties of Dy ³⁺ /Sm ³⁺ single and codoped CaZrO ₃ perovskites that were prepared through conventional solid state ceramic route method. X‐ray diffraction studies confirmed the orthorhombic (Pnma) perovskite structure of the calcined samples. Photoluminescence studies of Dy ³⁺ doped CaZrO ₃ systems showed emission peaks at 484 nm and 575 nm due to the transition between ⁴ F _9/2 – ⁶ H _15/2 and ⁴ F _9/2 – ⁶ H _13/2 levels respectively. Intense red emissions were observed for Sm ³⁺ doped CaZrO ₃ systems at around 567 nm, 603 and 646 nm that corresponds to the ⁴ G _{5 / 2} → ⁶ H _{5 / 2} , ⁴ G _{5 / 2} → ⁶ H _{7 / 2} and ⁴ G _{5 / 2} → ⁶ H _{9 / 2} transitions of Sm ³⁺ . Two different emissions were observed at different excitations for Dy ³⁺ /Sm ³⁺ codoped CaZrO ₃ systems. Pleasant white light emission was achieved for the CaZr _0.9 Sm _0.025 Dy _0.075 O ₃ system at 354 nm excitation with CIE color coordinates (0.3310, 0.3349) with a quantum yield of 16.14%, makes this system a promising candidate for WLED and display device applications. Uniform grain morphology and elemental composition of CaZr _0.9 Sm _0.025 Dy _0.075 O ₃ sample was revealed from scanning electron microscopic and electron dispersive X‐ray analysis. The presence of elements and their oxidation states in the calcined samples for doubly doped system was confirmed from X‐Ray photoelectron spectroscopicstudies.