title: Modulated fluorescence of colloidal quantum dots embedded in a porous alumina membrane.
abstract: The fluorescence spectrum of CdSe core-CdS/ZnS shell colloidal quantum dots (QDs) embedded in porous alumina membrane was studied. Small peaks, superimposed on the principal QD fluorescence spectrum, were observed. Finite-difference time-domain simulation indicates that the QD point radiation emitting from within the membrane is strongly modulated by the photonic band structure introduced by the membrane pores, leading to the observed fine spectral features. Moreover, the principal QD fluorescence peak red-shifted when the optical excitation power was increased, which is attributed to QD material heating due to emitted phonons when the photoexcited electron and hole relax nonradiatively from high-energy states to the ground exciton state before fluorescence.
authors.affiliation: Science for Life Laboratory, Department of Applied Physics, Royal Institute of Technology , SE-106 91 Stockholm, Sweden.
authors.forename: Hao
authors.initials: H
authors.lastname: Xu
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Otto
authors.initials: O
authors.lastname: Manneberg
authors.forename: Aman
authors.initials: A
authors.lastname: Russom
authors.forename: Kristinn B
authors.initials: KB
authors.lastname: Gylfason
authors.forename: Hjalmar
authors.initials: H
authors.lastname: Brismar
authors.forename: Ying
authors.initials: Y
authors.lastname: Fu
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D019187:Cadmium Compounds / Q000737:chemistry; D003102:Colloids / Q000737:chemistry; D004583:Electrons; D017785:Photons; D016062:Porosity; D045663:Quantum Dots / Q000737:chemistry*; D018036:Selenium Compounds / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013440:Sulfides / Q000737:chemistry; D017967:Zinc Compounds / Q000737:chemistry
chemical_list: D019187:Cadmium Compounds; D003102:Colloids; D018036:Selenium Compounds; D013440:Sulfides; D017967:Zinc Compounds; C034939:cadmium sulfide; C058667:cadmium selenide; C031238:zinc sulfide; D000537:Aluminum Oxide