Abstract
Optical absorption and room temperature photoluminescence (PL)properties of nanometre AgI–silica composite synthesized by a simpleheating–quenching method were investigated. The absorption of quenchedAgI–silica was enhanced markedly. Three absorption bands at 440 (2.8eV), 260 (4.8 eV) and 220 nm (5.6 eV) were observed. The excitonicabsorption of AgI showed a red shift of ∼0.11 eV,in contrast to the usually observed blue shift in AgI nanocrystals.Besides two UV emissions from a non-bridging hole centre andE′centre defects formed in silica, the composite exhibited two PL emissions at 2.62and 2.40 eV. The 2.62 eV PL was ascribed to donor–acceptor recombination ofAgI, while the 2.40 eV one may correlate with energy levels induced by theinteraction between silica and AgI. The role of silica in improving the PL fornanometre AgI is discussed.
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