An interesting fluorescence intensity reverse photonic phenomenon between red and green fluorescence is investigated. The dynamic range Sigma of intensity reverse between red and green fluorescence of Er(0.5)Yb(3):FOV oxyfluoride nanophase vitroceramics, when excited by 378.5nm and 522.5nm light respectively, is about 4.32x10(2). It is calculated that the phonon-assistant energy transfer rate of the electric multi-dipole interaction of {(4)G(11/2)(Er(3+))?(4)F(9/2)(Er(3+)), (2)F(7/2)(Yb(3+))?(2)F(5/2)(Yb(3+))} energy transfer of Er(0.5)Yb(3):FOV is around 1.380x10(8)s(-1), which is much larger than the relative multiphonon nonradiative relaxation rates 3.20x10(5)s(-1). That energy transfer rate for general material with same rare earth ion's concentration is about 1.194x10(5)s(-1). These are the reason to emerge the unusual intensity reverse phenomenon in Er(0.5)Yb(3):FOV.
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