The Effect of the Photonic Stop-Band upon the Photoluminescence of CdS in Opal

Abstract

Photonic bandgap (PGB) structures based on synthetic opal have been modified by in‐situ growth of CdS. The resulting structures show an enhanced stop‐band as determined from transmission and reflection measurements. Photoluminescence from the structures is squeezed to the low‐energy side of the stop‐band, with the effect increasing with higher fraction of CdS.

A bottom-up fabrication method for the production of visible light active photonic crystals

“…In principle, the light emitted from the semiconductor ncSis should be modified in presence of the dielectric periodicity of the ncSi-SIO structure. 29,30,[55][56][57][58][59][60][61][62] Since in the PL measurements, the emitted light is collected at 60° angle with respect to the opal surface normal, it was necessary to also record the reflection and transmission spectra of ncSi-SIO-1 sample measured at 60° incidence, Fig. 2f.…”

Modification of emission of CdTe nanocrystals by the local field of Langmuir–Blodgett colloidal photonic crystals

“…Such emission suppression is conveniently observed in opal-based 3D PhCs impregnated with light emitters. [37][38][39] In contrast, if the light source is close to a PhC surface, it is not isolated from modes of free space, but subjected to the PhC local field, the magnitude of which is greatly enhanced in the PBG range. This increase in field magnitude is replicated in the increase in PL intensity.…”

Photonic crystals in the optical regime — past, present and future

“…The possibility has been recognised for several years [74,75] that semiconductor material can, using suitable`loadinga processes, fully or partially "ll the voids inherent in the structure of opal and at the same time provide both a larger Fig. 9.…”

“…The inset con"rms that low transmission coincides with high re#ection as expected. Courtesy of S.G Romanov, University of Glasgow [75].…”

“…with suitable semiconductor material, produces. The technology of the loading process is challenging, but signi"cant progress has been made both using vapour-phase deposition processes [74] and liquid-phase "lling processes [75]. Fig.…”