Luminescence Of Cr3+ And Energy-Transfer Between Cr3+ And Nd3+ Ions In Yttrium-Aluminum-Garnet
Abbreviated Journal Title
J. Appl. Phys.
CRYSTALS; SPECTRUM; LASERS; CR-3+; Physics, Applied
The luminescence properties of Cr3+ ions and the energy transfer between Cr3+ and Nd3+ ions have been studied quantitatively in yttrium aluminum garnet (YAG). The energy level diagram and the emission spectrum of T-4(2)-- > (4)A(2) transition of Cr3+ ions were calculated in this crystal using the single-configurational-coordination model and the absorption data. Our calculated Delta value (the energy difference between the (2)E zero-vibrational level and the crossover point of (2)E and T-4(2) states, similar to 730 cm(-1) at room temperature, in contrast to the previously estimated value of similar to 1000 cm(-1), accounts for a variety of experimental results more satisfactorily. Both the T-4(2) and (2)E states of Cr3+ ions were found to contribute to the energy transfer to Nd3+ ions. The contribution of the former dominates at high temperatures and the latter at low temperatures. The thermal population distribution between the T-4(2) and (2)E states of Cr3+ ions was shown to be responsible for the temperature dependences of the Cr3+ luminescence properties and the Cr3+ to Nd3+ energy transfer processes. An electric dipole-dipole interaction mechanism was found to be adequate to describe the energy transfer process for temperatures up to about 400 K. (C) 1995 American Institute of Physics.
Journal of Applied Physics
"Luminescence Of Cr3+ And Energy-Transfer Between Cr3+ And Nd3+ Ions In Yttrium-Aluminum-Garnet" (1995). Faculty Bibliography 1990s. 1362.