Engineering Porous Emitting Framework Nanoparticles with Integrated Sensitizers for Low‐Power Photon Upconversion by Triplet Fusion

摘要: The conversion of low-energy light into photons higher energy based on sensitized triplet-triplet annihilation (sTTA) upconversion is emerging as the most promising wavelength-shifting methodology because it operates efficiently at excitation powers low solar irradiance. However, production solid-state upconverters suited for direct integration in devices still an ongoing challenge owing to difficulties concerning organization two complementary moieties, triplet sensitizer, and annihilator, which must interact efficiently. This problem solved by fabricating porous fluorescent nanoparticles wherein emitters are integrated robust covalent architectures. These emitting aromatic framework (ePAF) allow intimate interaction with included metallo-porphyrin sensitizers. Remarkably, high concentration framed chromophores ensures hopping-mediated diffusion required TTA, yet density promotes their optical features without quenching effects, typical solid state. A green-to-blue photon yield 15% achieved: a record performance among annihilators condensed phase. Furthermore, engineered ePAF architecture containing covalently linked sensitizers produces full-fledge bicomponent particles that behave autonomous nanodevices.