Emission of globular SiO 2 photonic crystals infiltrated with dielectrics is observed within a wide spectral region under excitation with the light wavelength λ = 400 nm. The first part of the emission spectrum located in the vicinity of the excitation line depends on infiltrated substance and is explained by surface-enhanced Raman scattering effect. The second one lying in the region of 440-650 nm that includes the stop-band is caused by spontaneous parametric down-conversion. PACS:78.67-n + 78.55.Mb UDC: 535.361

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Spontaneous emission of laser dye molecules (rhodamine 6G and pironin G) embedded into pores of synthetic opal photonic crystals is studied in the spectral region of 520-650 nm. It is ascertained that the emission spectra are greatly dependent on the photonic stop-band position and the spectral distribution of photon density of states. A dependence of spectral position of the emission band from the dielectric contrast is found. PACS:78.67-n , 78.55.Mb UDC: 535.361

The emission of rhodamine 6G and 2,5-bis(2-benzoxazolyl)hydroquinone molecules embedded in synthetic opal photonic crystals are studied in the spectral range of 520-620 nm. It is found that the intensity of spontaneous emission is suppressed in the spectral region corresponding to the photonic stop band and is amplified on its "blue" side. PACS:78.67-n, 78.55.Mb UDC: 535.361

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