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.