Spectroscopic study and white-light simulation using praseodymium-doped fluorogermanate glass as single phosphor for white LEDs

White light and near-infrared emissions of Pr3+ ions in SiO2-LaF3 sol–gel nano-glass-ceramics

“…Therefore, it could be stated that the fabricated Pr 3+ -doped glass-ceramics may satisfy the requirements defined for the white light emitters. White light emission originating from Pr 3+ ions was also reported for BaWO 4 nanophosphors, 26 fluorogermanate 60PbGeO 3 -20PbF 2 -20CdF 2 nano-structured phosphors, 70 β-NaYF 4 , 71 or Lu 2 MoO 6 phosphors, 72 as also depicted in Table 2. Furthermore, another important parameter, color purity (CP), was also calculated based on the following equation 73 in which ( x , y ) are the chromaticity coordinates for individual Pr 3+ -doped sample, ( x i , y i ) are the coordinates of standard white light (0.333||0.333), and ( x d , y d ) are the chromaticity coordinates of the dominant wavelength (determined from the straight line connecting the white light point and the ( x , y ) coordinates of a sample, as presented in the paper).…”