Near-infrared-to-visible upconversion from 980 nm excitation band by binary solid of PbS quantum dot with directly attached emitter

Abstract

Long wavelength NIR photon upconversion (UC) by triplet-triplet annihilation in cast solid was reported. By NIR excitation at 975 nm to the binary solid of PbS quantum dot (QD) and...

Recent advances in triplet–triplet annihilation upconversion and singlet fission, towards solar energy applications

“…207 The same TES-ADT system was recently used in a binary solid-state system, using higher energy PbS NCs. 209 The  UC determined to 0.2 % with 975 nm excitation. One limiting factor is likely the propensity of TES-ADT chromophores to undergo SF in the solid-state.…”

Enhancing NIR-to-visible photon upconversion in cast solid by introducing bulky substituents in rubrene and by suppressing back energy transfer

“…20 Therefore, solid-state materials that convert NIR light to visible light are desired. Although much effort has been devoted to the development of such solid-state NIR-UC materials, 21–33 their performance is still limited compared to solution-based and visible-conversion UC systems.…”

Solvent-free temperature gradient melt formation of efficient visible-to-UV photon upconversion organic films with subsolar threshold and over 100 h photostability in air

“…To date, after some early works that embedded chromophores into polymers, 13,14 solid-state UC has been intensively investigated. 15–18 However, no UV–UC solids with an excitation threshold comparable with or lower than terrestrial solar intensity have been reported. 14,18…”

“…17 Although such slowly grown vdW crystals have afforded substantially high performance in air 17 and resolved the previous issue of low sample crystallinity,‡‡Low crystallinity of organic UC solids was often resulted from the use of rapid solidification (or kinetically controlled) approaches, which were used to mitigate aggregation of the sensitizer species during formation of bicomponent organic solids. 7,16 See our previous paper 17 for detailed discussion on this point. the corresponding preparation used organic solvents during the recrystallization for 1–3 days. 17 Therefore, a solvent-free method to controllably and reproducibly generate high-performance UV–UC solids, preferably in the form of a film that is compatible with broad applications, is highly desired.…”

“…‡Low crystallinity of organic UC solids was often resulted from the use of rapid solidification (or kinetically controlled) approaches, which were used to mitigate aggregation of the sensitizer species during formation of bicomponent organic solids. 7,16 See our previous paper 17 for detailed discussion on this point.…”