Photoluminescence manipulation based on composite photonic crystal surfaces

A series of composite PC films with different morphologies are fabricated through a facile approach. The effects of different surface morphologies and the stopband positions of composite PC films on photoluminescence (PL) behaviors are systematically investigated. We observe that the PL on composite PC surfaces can be manipulated. When dyes enter into interstitial space of PC films without photo-crosslinkage, inhibited spontaneous emission is evident and emission is enhanced at the blue edge of photonic stopband. When dyes are deposited on outer surface of composite PC films, inhibited spontaneous emission disappears, but an obvious enhancement of the emission is achieved, where the composite PC surface acted as a Bragg mirror. The study will be of great guideline for future development of highly efficient optical devices.