Highly efficient triplet–triplet annihilation upconversion in polycaprolactone: application to 3D printable architectures and microneedles

Abstract

This research reports the next generation of solid-state triplet–triplet annihilation upconversion (TTA-UC) host material (polycaprolactone, PCL) for highly efficient, processable, and biocompatible solid-state TTA-UC. UC PCL was successfully fabricated using...

Nanoengineering Triplet–Triplet Annihilation Upconversion: From Materials to Real-World Applications

“…216 Its excellent biocompatibility, thermoplasticity, and strong mechanical stability makes it suitable for a wide range of biomedical applications, such as 3D-printed UC microneedles. 216 Furthermore, Turshatov et al observed efficient solid-state TTA-UC well below T g when using amorphous poly(olefin sulfone)s as host materials which also act as an excellent oxygen barrier. 217 This group of materials behaves more fluidically at the nanoscale and more rigid at the macroscale due to the incorporation of long flexible side chains, thereby showing great promise for the use of integrating solidstate TTA-UC.…”

“…For instance, polycaprolactone (PCL) has a low T g (ca. −60 °C) while exhibiting low oxygen permeability . Its excellent biocompatibility, thermoplasticity, and strong mechanical stability makes it suitable for a wide range of biomedical applications, such as 3D-printed UC microneedles .…”

“…−60 °C) while exhibiting low oxygen permeability . Its excellent biocompatibility, thermoplasticity, and strong mechanical stability makes it suitable for a wide range of biomedical applications, such as 3D-printed UC microneedles . Furthermore, Turshatov et al observed efficient solid-state TTA-UC well below T g when using amorphous poly­(olefin sulfone)­s as host materials which also act as an excellent oxygen barrier .…”

Triplet–triplet annihilation upconversion combined with afterglow phosphors for multi-dimensional anti-counterfeiting and encoding

“…In consequence, to develop solid-state TTA-UC with high efficiency and good processability has always been a research hotspot. 62 To pursue this aim, many types of soft matters, including organogel, hydrogel, microcapsule, nanoparticle and polymer film, were reported as solid-state TTA-UC carriers, [63][64][65] which exhibited solid form at macroscopic scale and kept liquid state at microscopic scale. Whereas, few research works have focused on the processability of solid-state TTA-UC.…”

Triplet‐Triplet Annihilation Up‐Conversion Luminescent Assisted Free‐Radical Reactions of Polymers Using Visible Light

“…Compared with thermally initiated free‐radical reactions, photoinitiated ones have advantages of low‐energy consumption and fast reaction velocity. [ 1,4,5 ] Besides, with their superiorities of controllable space, low equipment requirement, [ 1,6 ] and environmental friendliness, [ 7 ] photoinitiated reactions are extensively used in the fields of coatings, adhesives, [ 8 ] optoelectronics, 3D printing, [ 9,10 ] nanotechnology, etc.…”