Abstract
Layered double hydroxide (LDH) nanostructure film with highly oriented have been fabricated on inert substrate such as AEBE glass and InGaN-based light-emitting diodes by one-step, room-temperature process, in which the chemical formula of the oriented ultrathin film is Li2Al4(CO3)(OH)12．mH2O confirmed by GAXRD. This study simply immersed the tablet-shaped specimen lying flat in a aqueous alkaline Al3+- and Li+ -containing solution. The solution was prepared by dissolving AlLi intermetallic compound (IMC) in distilled water. This method is simple, rapid, and may be readily extended to some other inert substrate. As an example, Li-Al-CO3 LDH thin film was coated on AEBA glass in only 40 minutes, the treated specimen demonstrates almost 100 % transparency to visible light and exhibits UV shielding ability in UV-B to UV-C region (minimum about 85 % UV transparency). In another case, nano-scale Li-Al LDH-covered InGaN-based LEDs has been realized in only 30 minutes, that the light output power of the LDH (thin)-LED had a 31.2 % enhancement at 20-mA operating current, compared to standard InGaN-based LEDs (ST-LEDs). After calcinating the as-grown Li-Al LDH film (via hanging method) at high temperature (600 ℃) for 12 hours, a LiAlO2/γ-Al2O3 porous micro-sheet film was obtained on porous 316L stainless steel tube, in which the porous oxide film offers a application possibilities to be a intermetallic diffusion barrier.
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