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Intense room-temperature photoluminescence (PL) from the UV to the green region was observed from Zr 4+ -doped silica synthesized by a sol–gel process using tetraethoxysilane as the precursor, followed by thermal treatment at 500 °C in air. The wide PL band can be resolved into three components centered at 3.70, 3.25, and 2.65eV, respectively. The intensity of the 3.25 and 2.65eV PL bands...
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