Colour shift in Dy3+-doped lithium aluminoborate glass

The optical properties of Dy3+-doped lithium aluminoborate glass are investigated. Sample series of varying modifier-to-former ratio and different Dy3+ concentration are analysed for their optical absorption, quantum efficiency, photoluminescence yield, and chromaticity. The samples show a luminescence quenching upon increasing the Dy3+ concentration, though the optical absorption increases linearly. Changing the modifier-to-former ratio in favour of the network former leads to an increase in luminescence yield. For all samples, the photoluminescence spectra are dominated by two emission bands in the visible spectral range, namely at 483 nm and 575 nm. The relative contribution of these bands to the total luminescence changes with the modifier-to-former ratio as well as the Dy3+ concentration. The colour impression of the samples changes accordingly.