Spectroscopic properties of Er~(3+) and Eu~(3+) doped acentric LaBO_(3) and GdBO_(3)

摘要

This work studies the spectroscopic behavior of Eu~(3+)-doped and Yb~(3+)/Er~(3+)-codoped single crystals of orthorhombic LaBO_(3) and rhombohedral GdBO_(3). Emissions from Er~(3+) at ～1535 nm are shown to exhibit multiple narrow linewidth emissions. Luminescence from the ~(5)D_(0)→~(7)F_(1), ~(7)F_(2) transitions of Eu~(3+) is found to depend on the choice of LaBO_(3) or GdBO_(3) as a parent phase in a well-defined manner. Phonon sideband spectroscopy of the Eu~(3+) ~(5)D_(2) excitation, corroborated using Raman spectroscopy, indicates that the highest energy phonon is less than 1400 cm~(-1) for the LaBO_(3) and less than 1010 cm~(-1) for the GdBO_(3). Further, absorption spectrum to 190 nm is provided for the GdBO_(3) clearly showing the ~(6)I manifold, and the rarely seen ~(6)D levels. Excitation of the ~(6)D_(7/2) state at 250 nm in GdBO_(3) is shown to yield a strong ultraviolet emission centered at 314 nm. This work marks the lanthanide borates as candidate single crystals for active and nonlinear materials for UV, visible, and telecommunication band applications.