Manipulating emission of CdTeSe nanocrystals embedded in 3D photonic crystals
Résumé
We report experimental and theoretical results on the photoluminescence of CdTeSe nanocrystals, embedded in a silica opaline structure by infiltration of a highly diluted solution. Strong modification of emission diagrams of embedded nanocrystals have been observed in good agreement with theoretical models. At macroscopic scale, we measured the difference of lifetime between an opal infiltrated with nanocrystals with emission wavelength in the pseudogap and an opal with smaller balls size for which the nanocrystal emission wavelength is outside the pseudogap. The photonic bandgap effect leads a lifetime increase of the order of 10%. These lifetime variations are shown to be in good agreement with the calculated local density of states modification due to the pseudogap.