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Lithium-ion dynamics in the garnet-type solid electrolyte "Li 7 La 3 Zr 2 O 12 " (LLZ) crystallizing with cubic symmetry was probed by means of variable-temperature 7 Li NMR spectroscopy and ac impedance measurements. Li jump rates of an Al-containing sample follow Arrhenius behavior being characterized by a relatively high activation energy of 0.54(3) eV and a pre-exponential factor of 2.2(5) × 10 13 s −1 . The results resemble those which were quite recently obtained for an Al-free LLZ sample crystallizing, however, with tetragonal symmetry. Hence, most likely, the significantly higher Li conductivity previously reported for a cubic LLZ sample cannot be ascribed solely to the slight structural distortions accompanying the change of the crystal symmetry. Here, even Al impurities, acting as stabilizer for the cubic polymorph at room temperature, do not lead to the high ion conductivity reported previously.

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In this paper, we have proposed a novel LCD backlight unit (BLU) composed of a light-guide plate (LGP) mounting high fill-factor microlens array and an optical sheet of conical microlens array with a slanted angle of 54.5P o P.The proposed BLU shows 13.6% improvement in the total luminance compared with the conventional BLU and the viewing angle of 108P oWe also have fabricated Ni-stamper with the microlens array pattern for injection molding, one of the cost-efficient methods for mass production.

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