Broadband 2.84 μm luminescence properties and Judd–Ofelt analysis in Dy3+ doped ZrF4–BaF2–LaF3–AlF3–YF3 glass

2.84 μm luminescence with a bandwidth of 213 nm is obtained in Dy3+ doped (ZrF4–BaF2–LaF3–AlF3–YF3) ZBLAY glass. Three intensity parameters and radiative properties have been determined from the absorption spectrum based on the Judd–Ofelt theory. The 2.84 μm emission characteristics and energy transfer mechanism upon excitation of a conventional 808 nm laser diode are investigated. The prepared Dy3+ doped ZBLAY glass possessing high predicted spontaneous transition probability (45.92 s−1) along with large calculated emission cross section (1.17×10−20 cm2) has potential applications in 2.8 μm laser.