Photoluminescence enhancement of quantum dots with photonic structures

✍ Scribed by K. Liu; R. Tsu

• Book ID: 104053452
• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 611 KB
• Volume: 40
• Category: Article
• ISSN: 0026-2692
• DOI: 10.1016/j.mejo.2008.11.052

✦ Synopsis

Photoluminescence (PL) of CdSe/ZnS quantum dots (QDs) deposited on Si and photonic crystals with packed silica spheres, are investigated with the purpose of establishing enhancement of PL. Quantum dots with size $2.4 nm are introduced into the solution containing silica spheres of $345 nm size. Upon evaporation, QDs are incorporated into the photonic crystals made of close-pack spheres. We found that PL is red-or blue-shifted (from interaction with molecular complexes) with increase of QD-density. The broad PL emission is partly from particle size distribution, but mainly due to the interaction with local molecular complexes with surface quantum size effects. We have also observed enhanced interaction when the emission is close to the photons at the Brillouin zone boundary.