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Optical Properties of PbSe and PbS Quantum Dots Embedded in Oxide Glass
Author(s) -
Dantas N.O.,
Silva R.S.,
Qu Fanyao
Publication year - 2002
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200207)232:1<177::aid-pssb177>3.0.co;2-a
Subject(s) - quantum dot , photoluminescence , materials science , annealing (glass) , optoelectronics , raman spectroscopy , oxide , absorption (acoustics) , nanotechnology , optics , composite material , physics , metallurgy
PbSe and PbS quantum dots (QDs) embedded in the oxide glass matrixes (SiO 2 –Na 2 CO 3 –ZnO–Al 2 O 3 –PbO 2 –B 2 O 3 ) were synthesized by means of fusion method. Their optical properties have been studied both theoretically and experimentally. We found that the optical absorption is strongly dependent upon thermal‐treatment processes, for instance annealing temperature and time. An increase of the annealing time leads to a red shift of the optical features at the higher energy side, suggesting an increase of QD‐size. An up‐conversion photoluminescence emission band at about 2.476 eV was observed in the PbS QDs. It is attributed to a resonant Raman process.