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We study the angle-resolved spontaneous emission of near-infrared lightsources in 3D photonic crystals over a wavelength range from 1200 to 1550 nm.To this end PbSe quantum dots are used as light sources inside titania inverseopal photonic crystals. Strong deviations from the Lambertian emission profileare observed. An attenuation of 60 % is observed in the angle dependent radiantflux emitted from the samples due to photonic stop bands. At angles thatcorrespond to the edges of the stop band the emitted flux is increased by up to34 %. This increase is explained by the redistribution of Bragg-diffractedlight over the available escape angles. The results are quantitativelyexplained by an expanded escape-function model. This model is based ondiffusion theory and adapted to photonic crystals using band structurecalculations. Our results are the first angular redistributions and escapefunctions measured at near-infrared, including telecom, wavelengths. Inaddition, this is the first time for this model to be applied to describeemission from samples that are optically thick for the excitation light andrelatively thin for the photoluminesence light.

Angular redistribution of near-infrared emission from quantum dots in 3D photonic crystals