Indexed by:期刊论文

Date of Publication:2018-06-05

Journal:ADVANCED OPTICAL MATERIALS

Included Journals:SCIE

Volume:6

Issue:11

ISSN No.:2195-1071

Key Words:Cr(VI) detection; fluorescence enhancement; heterostructure photonic crystal; super-wide stopband; universal substrate

Abstract:Universal fluorescence (FL) enhancement is achieved based on a multiple heterostructure photonic crystal (MHPC) with a super-wide stopband. This MHPC film is fabricated by layer-by-layer deposition of annealed colloidal crystal monolayers with gradient sizes, and it displays a broadened stopband (from 280 to 650 nm) that 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)(3)Cl-2], rhodamine 6G (Rh6G), and rhodamine B (RhB) on the MHPC is 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. The function of MHPC/rhodium B hydrazide composites is further demonstrated in the semiquantitative detection of Cr(VI), and the limit of detection of Cr(VI) is effectively improved to 0.2 ppb.