Study on maximum phonons in selected glass and glass-ceramics doped with rare-earth ions. The optimal and neutral maximum phonon

摘要

Basing on our previous experimental data, together with new results, and on kinetic analysis of the simple model of Pr3+ and Er3+ doped material we present how the maximum phonon value h omega(max) can change when the non-crystalline matrix under interest (glass) undergoes phase conversion to polycrystalline form (glass-ceramics). We estimate the range of such a change and calculate how this change can affect the luminescence efficiency. The increase in the luminescence efficiency due to diminished value of h omega(max) is, for both dopants, at most around 30%. Moreover, the diminishing phonon energy value can sometimes spoil the luminescence efficiency. This seemed to show that the common opinion: that the smaller h omega(max) value the better luminescence efficiency, does not have to be true. Therefore we have performed more detailed analysis of the influence of h omega(max) on the emission efficiency. It appears that in case of Pr3+ ions there is an optimal maximum phonon energy value (similar to 420 cm(-1)) whereas in case of Er3+ ions the value of maximum phonon energy can be of no importance. (C) 2020 Elsevier B.V. All rights reserved.