Sol-gel synthesis of ge nanocrystals-doped glass and its photoluminescence
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Ge nanocrystal-embedded SiO2 glasses were prepared by a sol-gel process. The glasses synthesized through the hydrolysis of Si(OC2H5)4 and GeCl4 were heated in H2 gas atmosphere at 500 to 800°C, in which Ge4+ ions were reduced to precipitate nanosized Ge crystals with the size smaller than 10 nm diameter. Glasses doped with Ge nanocrystals of diameter of ≈5 nm showed the optical absorption edge at ≈2.8 eV and a broad photoluminescence exhibiting the peak at around 2.2 eV. Large Ge crystals precipitated by heating above 800°C showed no photoluminescence.
Key wordsGe nano-crystal photoluminescence doped glass sol-gel
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