The fluorescence spectrum of Er-indiffused LiTaO3 was measured and revealed strong anti-Stokes fluorescence (ASF) with upconverted green and red emissions when the F9/24 manifold of an Er3+ ion was pumped by either a 632.8 or a 647 nm laser. Investigation into the dependence of fluorescence intensity on pump intensity and depth profiling of the Stokes and anti-Stokes fluorescences revealed that the ASF is attributed mainly to energy transfer upconversion within Er3+ cluster sites. Postindiffusion processing in molten LiNO3 was found to be effective in suppressing the upconversion via decrease of the cluster site concentration.

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