Abstract
K 2Gd 1− x Zr(PO 4) 3:Eu x 3+ (0.02 ≤ x ≤ 0.1, x is in mol.%) were prepared by solid-state reaction method and their photoluminescence properties were investigated in ultra-violet (UV) and vacuum ultra-violet (VUV) region. The phenomenon of visible quantum cutting through downconversion was observed for the Gd 3+–Eu 3+ couple in this Eu 3+-doped K 2GdZr(PO 4) 3 system. Visible quantum cutting, the emission of two visible light photons per absorbed VUV photon, occurred upon the 186 nm excitation of Gd 3+ at the 6G J level via two-step energy transfer from Gd 3+ to Eu 3+ by cross-relaxation and sequential transfer of the remaining excitation energy. The results revealed that the efficiency of the energy transfer process from Gd 3+ to Eu 3+ in the Eu 3+-doped K 2GdZr(PO 4) 3 system could reach to 155% and K 2GdZr(PO 4) 3:Eu 3+ was effective quantum cutting material.
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