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We study angular dependences of the reflection and fluorescence spectra for the synthetic opal infiltrated with a photo-reactive substance, 2,5-bis(2-benzoxa- zolyl)hydroquinone (BBHQ). The peak shift observed in the reflection spectra with increasing incidence angle of light is satisfactorily described by the Bragg diffraction law if the effective dielectric constant of the composite obtained by us is taken to be eeff = 2.10. A suppression of fluorescence inside the stop-band and an increase in the shorter-wavelength fluorescence intensity are identified. The latter effect is explained by increasing role of radiative transitions through the surface states and impurity levels. The concentration of surface states increases essentially for the BBHQ embedded in the opal pores, and the impurity levels are formed by BBHQ molecules with substituted hydroxyl groups or with modified benzazole rings.

Modification of optical properties of 2,5-bis(2-benzoxazolyl)hydroquinone in opal photonic crystals