Near-infrared Luminescence and Energy Transfer Characteristics of Dy{sup}(3+)-Tm{sup}(3+) Co-doped Selenide Glasses

摘要

Near-infrared emission properties of Dy{sup}(3+)-Tm{sup}(3+) co-doped Ge-Ga-Sb-Se glasses were investigated. Possible energy transfer routes and the regime of donor decay were discussed. Tm{sup}(3+) is found to be an efficient sensitizer on the Dy{sup}(3+):1.34μm luminescence. Probable energy transfer schemes include Tm{sup}(3+):3{sup left}H{sub}4 → Dy{sup}(3+):6{sup left}F{sub}(5/2) and Tm{sup}(3+):3{sup left}H{sub}5 → Dy{sup}(3+):6{sup left}F{sub}(11/2)·6{sup left}H{sub}(9/2). The donor (Tm{sup}(3+)) excitation is transferred to an acceptor (Dy{sup}(3+)) by direct interaction or migrates among donors by diffusion-limited regime until it comes into the vicinity of an energy acceptor where direct interaction and transfer occur.