Abstract
Enabling an understanding of the optical properties of functional inorganic–organic materials is crucial for driving development in many areas such as medicine and optoelectronics. In particular the use of two-dimensional materials such as hexagonal boron nitride has been recently investigated for the fabrication of nanohybrid composites due to the unique properties of the material. Here we report the use of boron nitride/silver nanoparticle (BN/AgNP) composite templates as an effective substrate for controlling the fluorescence emission of adsorbed organic molecules through applying external electric fields in the range of 0 to 3 × 104 V/m. We report fluorescence quenching in the field and enhancement of fluorescence signal intensity of J-aggregate porphyrins up to 20 min following removal of the applied voltage. We propose that the observed enhancement can be attributed to charge release upon switching off the field due to capacitance effects associated with the BN/AgNP substrate.
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