The visible and near infrared emission from rare earth ions has attracted great interest, particularly with regard to developing tools for photonic devices. We demonstrate the application of the Confocal Fluorescence Microscopy (CFM) technique to the up-conversion luminescence of Ba(Ti0.97Er0.03)O3-BTE3 thin films on glass substrate. Thin films BTE3 were grown by spin coating on glass substrate at room temperature and post-depositions thermal treatment at 600°C. Green and red up-conversion emission at 520, 550 and 670 nm was observed from these BTE film with 790, 800 and 980 nm excitation. The fluorescence results suggest a clear dependence of excitation wavelength on emission intensity, where a ~3 fold enhancement in emission has been demonstrated under Er3+ (800 nm) excitation which can be attributed to an effective energy transfer between Er3+ ions.
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