Fig. 4. (a) PLE spectra of SMO:0.02Eu³⁺ and PL spectra of the SMO:0.02Dy³⁺ phosphors; PL spectrum of SMO:0.02Dy³⁺,yEu³⁺ phosphors under (b) 352 and (c) 266 nm excitation; (d) ET efficiency (η) of SMO:0.02Dy³⁺,yEu³⁺ phosphors under 352 and 266 nm excitations; (e) Dependence of (I_S0/I_S) of Dy³⁺ on C^6/3_Dy+Eu, C^8/3_Dy+Eu and C^10/3_Dy+Eu; (f) decay profiles of the SMO:0.02Dy³⁺,yEu³⁺ samples.