Optical Properties of PbSe and PbS Quantum Dots Embedded in Oxide Glass

✍ Scribed by N.O. Dantas; R.S. Silva; Fanyao Qu

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 90 KB
• Volume: 232
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/1521-3951(200207)232:1<177::aid-pssb177>3.0.co;2-a

✦ Synopsis

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.