Room Temperature Exciton Formation in SnO2 Nanocrystals in SiO2:Eu Matrix: Quantum Dot System, Heat-Treatment Effect
SnO2 nanocrystals in SiO2:Eu matrix have been prepared at a relatively low temperature of 170 °C for 4 h. Selective transition probability of Eu3+ emission could be done after a suitable excitation wavelength. The room temperature exciton formation at 285 nm for as-prepared nanoparticles is observed and this gives the Bohr's radius of 1.4 nm. Exciton formation disappears for the nanoparticles heated at 500 and 900 °C. This is related to the increase in particle size with heat-treatment. A wide-band-gap (4.35 eV) quantum dots is obtained and will be important in photonics and UV-lasing application.
Keywords: BOHR'S RADIUS; EXCITON FORMATION; LUMINESCENCE; QUANTUM DOTS; SNO2 NANOCRYSTALS
Document Type: Research Article
Publication date: April 1, 2009
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