Investigation of the mechanisms of interaction between chromium and neodymium ions in phosphate glasses

Mechanisms of the Cr ⇄ Nd excitation energy transfer in Li–La_1–x–y –Nd_x–Cr_y phosphate glasses were studied. It was established that the interaction between chromium and neodymium ions is of the dipole-dipole nature. It was found that at T = 77 °K the transfer of energy from chromium to neodymium ions is purely static and it is accelerated by energy migration between chromium ions when the temperature is increased to room temperature. Energy transfer from neodymium to chromium ions is due to the static mechanism and also due to hopping quenching under conditions of migration between neodymium ions. In a narrow temperature range near 150 °K, a regime involving supermigration quenching of neodymium luminescence by chromium ions is established. The microparameters of the elementary interactions between the active particles were determined. It was established that for concentrations x = 0.3 and y = 0.03, reverse transfer from neodymium to chromium ions is negligible at room temperature.