We report on the polymer nanocomposite coatings doped with the nanoparticles of rare-earth (RE)-doped fluoride phosphor NaYF4:Yb3+, Er3+ for luminescent solar concentrators (LSCs). Concurrent multi-beam multi-target pulsed laser deposition (CMBMT-PLD) of the phosphor and a polymer conducted in open air was investigated as a candidate process for such coatings. Polymer poly(methyl methacrylate) known as PMMA was considered to be deposited on a glass substrate from a solid target using fundamental harmonic (1064 nm) of a Q-switched Nd:YAG laser concurrently with the phosphor. The sun light was absorbed by the phosphor nanoparticles embedded in polymer film and converted into near-infrared (NIR) radiation via the mechanism of downconversion (quantum cutting). The NIR radiation propagated via the glass substrate as a light guide and was converted into electric power with photovoltaic cells attached to the edges of the glass plate. The polymer did not exhibit degradation during the open-air deposition process. The proposed method is capable to coat economically commercial window-size substrates. The polymer nanocomposite LSCs have broad absorption band covering a significant portion of the solar radiation spectrum, high spectral conversion efficiency, and low reabsorption due to minimal overlap between the absorption and emission spectra (large Stokes shift).
We report on the polymer nanocomposite films doped with the nanoparticles of rare-earth (RE)-doped fluoride phosphor NaYF4:Yb3+,Er3+ (molar proportion: a = 3% of Er3+, b = 1 to 5% of Er3+, and [100% - (a + b)] of Y3+) for efficient luminescent solar concentrators (LSCs). The films are deposited using the concurrent multi-beam multi-target pulsed laser deposition of the inorganic target material and matrix assisted pulsed laser evaporation of the polymer (MBMTPLD/MAPLE). Polymer poly(methyl methacrylate) known as PMMA was evaporated and deposited on a glass plate from its solution in chlorobenzene frozen in liquid nitrogen with the fundamental harmonic (1064 nm) of a Q-switched Nd:YAG laser concurrently with the inorganic phosphor target ablated with the 2-nd harmonic (532 nm) of the same laser. The sun light is absorbed by the phosphor nanoparticles embedded in the 250-nm thick polymer film and converted in near-infrared (NIR) radiation via the mechanism of downconversion (quantum cutting). The NIR radiation propagates via the glass plate as a light guide and is converted in electric power with photovoltaic cells attached to the edges of the plate. The advantage of the proposed polymer nanocomposite LSCs is a broad absorption spectrum covering a significant portion of the solar radiation spectrum, high spectral conversion efficiency, and low reabsorption due to minimal overlap between the absorption and emission spectra (large Stokes shift). The power concentration factor of the polymer nanocomposite LSC is expected to be of the order of 10.
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