Collective phenomena in Dy-doped silver halides in the near- and mid-IR

Abstract

The kinetics of the electronic transitions within the f-shell of Dy3+ ions were studied with monitoring near- and mid-IR luminescence decay under pulsed laser excitation at 1.3 µm. The luminescence decay curves were found to be profoundly non-exponential in all bands in the range between 1.3-5.5 µm. Such behavior is attributed to cross-relaxation and up-conversion processes dominating in relaxation of Dy3+ ions from the laser-excited multiplet 6H9/2+6F11/2. We suggest that strong collective phenomena occurring under relatively low concentrations are due to anomalous clustering of Dy3+ ions. The cross-relaxation enables an efficient population of 6H13/2 and 6H11/2 multiplets, offering this material as an active medium for a 3-µm and 4.3-µm lasers.

Mn2+ as an “Optical Energy Shutter” to Regulate Red‐to‐NIR Luminescence in Rare Earth Doped Layered Quadruple Perovskites

“…The emission located at 1300 nm of Dy 3+ -doped QPs is assigned to 4 F 11/2 + 6 H 9/2 → 6 H 15/2 f-f state transition of Dy 3+ . [47,48] Emission peaks at 645, 987, 1195, and 1490 nm of Ho 3+ -doped QPs are assigned to the 5 F 5 → 5 I 8 , 5 F 5 → 5 I 7 , 5 I 6 → 5 I 8 , and 5 F 5 → 5 I 6 f-f state transition of Ho 3+ , respectively. [49][50][51] 3 F 3 → 3 H 6 , 3 H 4 → 3 H 6 , 3 H 4 → 3 F 4 , 3 H 5 → 3 H 6 transition of Tm 3+ are associated with the emission peaks at 697, 803, 1223, and 1435 nm, respectively, in the samples of Tm 3+ -doped QPs.…”