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Terbium acetylacetonate hydrate (TAH)-doped poly methyl methacrylate (PMMA) with varying proportions was synthesized using the solvent evaporation method. Absolute spectral parameters of the samples under the excitation of a 308-nm light-emitting diode were derived adopting the integrating sphere method. The total radiant fluxes of typical visible emissions in 1, 2, and 3 wt% TAH doping PMMA samples are calculated to be 67.84, 80.16, and 93.90 µW, respectively, and the total luminous fluxes are determined to be 36.95, 43.16, and 50.18 millilumens. The results indicated that PMMA including TAH generates new applications as an efficient ultraviolet → visible conversion layer in enhancing the photovoltaic efficiency of solar cells. [ABSTRACT FROM AUTHOR]

Neodymium acetylacetonate hydrate (NAH) doped poly methyl methacrylate (PMMA) has been prepared and near-infrared (NIR) 1069 and 1342 nm emissions possessing the full widths at half maximum of correspondingly 61 and 75 nm have been observed. Judd-Ofelt intensity parameters Ωt (t = 2, 4, 6) are respectively derived to be 16.34 x 10-20, 11.35 x 10-20, and 9.50 x 10-20 cm², indicating a high asymmetrical and covalent environment of Nd3+ in NAH doped PMMA. The spontaneous emission probabilities for 4F3/2 → 4I11/2 and 4F3/2 → 4I13/2 transitions are severally 2542.4 and 456.9 s-1, from which the associated maximum stimulated emission cross sections have been determined to be 3.19 x 10-20 and 1.28 x 10-20 cm², respectively. High emission probabilities and large emission cross sections of NIR fluorescence in NAH doped PMMA reveal its potential as an NIR polymer optical material in practical applications as optical thin films and fibers. [ABSTRACT FROM AUTHOR]