Universal fluorescence (FL) enhancement was achieved based on a multiple heterostructure photonic crystal (MHPC). This MHPC film was fabricated by layer-by-layer deposition of annealed colloidal crystal monolayers (CCMs) with gradient sizes, and stopband overlapping and broadening was demonstrated. MHPC with a broadened stopband (from 280 to 650 nm) can overlap with the excitation wavelength (E) and the emission wavelength (F) of most commonly used fluorescent media. More than 100-fold FL enhancement of [Ru(dpp)3Cl2], rhodamine 6G (Rh6G) and rhodamine B (RhB) on the MHPC was observed compared to that on a glass substrate. This super-wide stopband MHPC may find significant applications for augmenting FL intensity in chemical and biochemical sensing, imaging, disease diagnosis and environmental monitoring. We further demonstrated the function of MHPC/rhodium B hydrazide (RBH) composites in the semi-quantitative detection of Cr(VI), and the limit of detection (LOD) of Cr(VI) was effectively improved to 0.2 ppb.

Universal fluorescence enhancement substrate based on multiple heterostructure colloidal photonic crystal with super-wide stopband and highly sensitive Cr(VI) detecting performance

256th National Meeting (2018)

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