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Optical Absorption and Photoluminescence in PbS Quantum Dots
Author(s) -
Qu Fanyao,
Silva R.S.,
Dantas N.O.
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<95::aid-pssb95>3.0.co;2-p
Subject(s) - photoluminescence , quantum dot , materials science , optoelectronics , raman spectroscopy , absorption (acoustics) , annealing (glass) , optics , physics , composite material
PbS quantum dots (QDs) embedded in a silicate glass matrix (SiO 2 –Na 2 CO 3 –ZnO–Al 2 O 3 –PbO 2 –B 2 O 3 ) were synthesized by a fusion method. The QD size strongly depends upon thermal treatment process variables, such as annealing time and temperature. Two up‐conversion photoluminescence emission bands at about 2.475 and 2.978 eV were observed. They are ascribed to the resonant Raman process and to the two‐step two‐photon absorption via a real intermediate state, respectively.