Evidence for visible quantum cutting involving the emission of two visible photons for each vacuum-ultraviolet (VUV) photon absorbed is demonstrated in $\mathrm{Sr}{\mathrm{Al}}_{12}{\mathrm{O}}_{19}:\mathrm{Pr},\mathrm{Cr}$ using synchrotron radiation as one of the excitation sources. Upon VUV excitation of the $4f5d$ states of ${\mathrm{Pr}}^{3+}$ , quantum cutting could occur by a two-step energy transfer from ${\mathrm{Pr}}^{3+}$ to ${\mathrm{Cr}}^{3+}$ by cross relaxation and sequential transfer of the remaining excitation energy. A theoretical visible quantum efficiency of 147% is estimated in $\mathrm{Sr}{\mathrm{Al}}_{12}{\mathrm{O}}_{19}:2\%$ Pr,5% Cr, suggesting the possibility of a VUV phosphor with visible quantum efficiency higher than 100% based on ${\mathrm{Pr}}^{3+}–{\mathrm{Cr}}^{3+}$ pair in oxide materials.

© 2007 Optical Society of America

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