Abstract
Tunable polychromatic light emission within the low correlated color temperature range was produced using terbium- and/or erbium–samarium co-doped PbGeO3:PbF2:CdF2 glass phosphor. The phosphors were synthesized, and their luminescence characteristics were examined under UV–blue light-emitting-diode laser excitation. Luminescence emissions around 490, 545, 600, and 645nm in Tb3+/Sm3+ co-doped phosphor and 525, 545, 600, and 645nm in Er3+/Sm3+ co-doped phosphor were obtained and analyzed as a function of the active ion concentration and excitation wavelength. Color tunability in the red–orange–yellow–green region was achieved combining the Tb3+, Er3+, and Sm3+ active ion contents. Results suggest that the color-tunable polychromatic light emitter herein reported is a promising candidate for application in warm white-light emission.
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