Energy Transfer Processes in Highly Rare‐Earth–Doped Planar YAG Waveguides

Lanthanide luminescence for functional materials and bio-sciences

“…An investigation of energy transfer processes in highly-doped (up to 10%) Y 3 Al 5 O 12 :Ln (Ln III = Nd, Yb, Pr) single crystals obtained by liquid phase epitaxy has been performed. 349 It confirmed that different concentrationdependent mechanisms operate in these systems including cross-relaxation, up-and down-conversion, as well as in the case of Pr III , excited-state absorption to the 4f-5d levels resulting in UV emission. Moreover, liquid phase epitaxy is a promising method leading to high-quality, highly-doped samples without structural defects.…”

UV emission properties of highly Pr3+-doped YAG epitaxial waveguides

“…This suggests that either the efficiency of populating the 3 P 0 level after UV excitation decreases with concentration or the concentration quenching rate for the 3 P 0 emission is growing faster with concentration than that for 4f5d emission. Indeed, we have observed that the Pr 3+ concentration dependence of the 3 P 0 quenching rate is nearly linear up to about 1 at% but above this value it depends quadratically on ion concentration [10].…”

“…The spectroscopic data on concentration effects in these systems are limited by the availability of appropriate samples [10]. The maximum concentration of Pr 3+ ions in YAG crystals, obtained using the standard Czochralski method, is limited to about 2 at%.…”

“…Photoluminescence decays were studied using an EasyLife LS Fluorescence Lifetime Spectrometer. The spectroscopic measurements in the visible range were carried out by using experimental equipment described elsewhere [10].…”

Multicenter Structure and Dynamical Processes in the Rare Earth Doped Garnet and Sesquioxide Laser Crystals and Ceramics

“…pairs that determine the M 1 satellites are coupled by mixed superexchange and dipoledipole interactions. [12,20,40] This was subsequently challenged in the investigation of the Nd pairs in planar YAG waveguides, [56] where luminescence emission at the wavelength of satellite M 1 was reported and the energy transfer rate inside the n.n. Nd pairs inferred from the emission decay was much smaller than reported for crystals and ceramics.…”