Low-Threshold Photon Upconversion Capsules Obtained by Photo induced Interfacial Polymerization

摘要

Photon upconversion (UC), that is, the emission of light at shorter wavelength than the excitation, is a promising optical process because of its potential application in photosensitive devices, including photovoltaics, photocatalyst systems, photochromic displays, and biological imaging. However, conventional UC systems based upon nonlinear phenomena such as two-photon absorption and second-harmonic generation require high excitation intensities (in the range of megawatts per square centimeter) and as a result may be undesirable.