Energy Transfer in Co-doped KMgCl3 : Ce3+-Eu3+ Phosphor

Abstract

The present work discusses photoluminescence in KMgCl₃ singly doped by Ce³⁺ ions and Eu³⁺ions independently and co-doped. Co-doped phosphor showed transfer of energy between a sensitizer ion Ce to an activator ion Eu and resulted into enhancement in photoluminescence emission.  Phosphors have been prepared using wet chemical synthesis. XRD pattern of KMgCl₃ matched with the standard JCPDS file 20-0905. The PL emission spectra have been observed for Ce³⁺ at 353nm and 375nm due to 5d-4f transition at excitation wavelength of 338 nm.  PL of Eu³⁺ is peaking at 596nm and 616nm at excitation wavelength of 394 nm in orange and red region due to ⁵D₀-⁷F₁ and ⁵D₀-⁷F₂ transition.

KMgCl₃:Ce^3+,Eu³⁺ have two peaks in  PL emission spectra in orange-red region of the spectrum at 596 nm and 616nm by UV excitation at 268nm  due to transitions of Eu³⁺ ion with improved luminescence properties. The energy transfer from Ce³⁺ to Eu³⁺ has been discussed based on the excitation and emission spectra.

The present work discusses photoluminescence in KMgCl₃ singly doped by Ce³⁺ ions and Eu³⁺ions independently and co-doped. Co-doped phosphor showed transfer of energy between a sensitizer ion Ce to an activator ion Eu and resulted into enhancement in photoluminescence emission.  Phosphors have been prepared using wet chemical synthesis. XRD pattern of KMgCl₃ matched with the standard JCPDS file 20-0905. The PL emission spectra have been observed for Ce³⁺ at 353nm and 375nm due to 5d-4f transition at excitation wavelength of 338 nm.  PL of Eu³⁺ is peaking at 596nm and 616nm at excitation wavelength of 394 nm in orange and red region due to ⁵D₀-⁷F₁ and ⁵D₀-⁷F₂ transition.

KMgCl₃:Ce^3+,Eu³⁺ have two peaks in  PL emission spectra in orange-red region of the spectrum at 596 nm and 616nm by UV excitation at 268nm  due to transitions of Eu³⁺ ion with improved luminescence properties. The energy transfer from Ce³⁺ to Eu³⁺ has been discussed based on the excitation and emission spectra.