Morphology and Luminescence Properties of Cellulose+KBi0.99Pr0.01 (MoO4)2 Composites

The procedure of the samples preparation, morphology and luminescence properties of composites those consist of cellulose matrix and praseodymium-doped potassium bismuth molybdate micro- and nanoparticles as a filler are reported. The optical and scanning electron microscopy has shown the homogeneity of the samples in the scale above 100
$\mu\mathrm{m}$
. The size distribution of oxide particles is found to be in a range from
$\sim 100$
nm up to 3
$\mu \mathrm{m}$
. Chemical element analysis indicates uniform distribution of oxide and polymer components over the studied area. The samples reveal intensive photoluminescence of
$\text{Pr}^{3+}$
ions if composite excitation is at 448 nm and cellulose-related luminescence under excitation at shorter wavelength −405 nm. The study of influence of temperature on luminescence characteristics of composites in the temperature range 18 -
$75\ ^{\circ}\mathrm{C}$
shows that intensity of
$\text{Pr}^{3+}\text{-}$
related luminescence decreases on about 40 %, while cellulose-related photoluminescence decreases on about 20%. The composites under study are prospective materials for elaboration of luminescent light emitting diodes covers.