Preparation and application of solid-state upconversion materials based on sodium polyacrylate

Abstract

By loading a microemulsion containing both sensitizer and emitter into porous sodium polyacrylate (PAAS), a water-absorbent resin (WAR) upconversion (UC) material was fabricated for photocatalysis applications.

Boost in Solid‐State Photon Upconversion Efficiency through Combined Approach of Melt‐Processing and Purification

“…Low-to-high photon energy conversion, also designated as photon upconversion (UC), can be achieved in smartly designed organic systems under low densities of noncoherent excitation (%mW cm À2 , e.g., irradiation by the sunlight), [1,2] which opens up a variety of fascinating applications such as targeted drug delivery, [3] bioimaging, [4] photocatalysis, [5,6] labeling, [7] stress sensing, [8] solar energy harvesting, [9][10][11] etc. The UC is accomplished via triplet-triplet annihilation (TTA) process in emitter (annihilator) species, where the energy of two triplets is combined to create one singlet excitation.…”

Photon upconverting bioplastics with high efficiency and in-air durability

“…[32][33][34][35] Solid-state TTA-UC materials are particularly important as a potential solution to overcome the Shockley-Queisser limit of photovoltaics and photocatalytic devices by recovering the wasted sub-bandgap photons. [36][37][38][39][40][41][42][43][44] TTA-UC typically occurs in multi-chromophore systems wherein the excited triplet energy of a sensitizer is transferred to an emitter via Dexter energy transfer. When two sensitized emitter triplets collide, the annihilation produces a high energy singlet state (S 1 ) that radiates delayed anti-Stokes fluorescence (Fig.…”

Efficient Red-to-Blue Triplet–Triplet Annihilation Upconversion Using the C70-Bodipy-Triphenylamine Triad as a Heavy-Atom-Free Triplet Photosensitizer

“…Photon upconversion has attracted widespread attention because of its fascinating properties that materials can absorb low-energy light and then emit high-energy photons. In recent years, it has been successfully applied in photovoltaics, − photocatalysis, − and bioimaging. , In comparison to the upconversion method with multiphoton absorptions, triplet–triplet annihilation upconversion (TTA-UC) has specific advantages, such as low light power density, high upconversion quantum yield, and capabilities of adjustable absorption and emission wavelengths. , …”