Visualization of deep ultraviolet photons based on F örster resonance energy transfer and cascade photon reabsorption in diphenylalanine-carbon nitrides composite film

A diphenylalanine (L-Phe-L-Phe, FF)-carbon nitride composite film is designed and fabricated to visualize the deepultraviolet (DUV, 245 –290 nm)photons. The FF film, composed of diphenylalanine molecules, doped withcarbon nitrides shows blue emission under excitation of DUV light, which makes the DUV beam observable. Both F örster resonanceenergy transfer and cascadephoton reabsorption contribute to the conversion ofphotonenergy. First, the FF is excited by the DUVphotons. On one hand, theenergy transfers to the embeddedcarbon nitrides through nonradiative dipole –dipole couplings. On the other hand, the 284 nmphotons emitted from the FF would further excite thecarbon nitrides, which will finally convert to bluefluorescence. Herein, the experimental demonstration of a simple device for the visualization of high DUV fluxes is reported.

Source: Applied Physics Letters - November 7, 2016 Category: Physics Authors: Zhixing Gan, Weiping Zhou, Zhihui Chen, Huan Wang, Yunsong Di and Shisong Huang Source Type: research