Abstract
Evidence for visible quantum cutting involving the emission of two visible photons for each vacuum-ultraviolet (VUV) photon absorbed is demonstrated in using synchrotron radiation as one of the excitation sources. Upon VUV excitation of the states of , quantum cutting could occur by a two-step energy transfer from to by cross relaxation and sequential transfer of the remaining excitation energy. A theoretical visible quantum efficiency of 147% is estimated in Pr,5% Cr, suggesting the possibility of a VUV phosphor with visible quantum efficiency higher than 100% based on pair in oxide materials.
© 2007 Optical Society of America
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