Hyperfluorescent polymers enabled by through-space charge transfer polystyrene sensitizers for high-efficiency and full-color electroluminescence

Abstract

Fluorescent polymers are suffering from low electroluminescence efficiency because triplet excitons formed by electrical excitation are wasted through nonradiative pathway. Here we demonstrate the design of hyperfluorescent polymers by employing...

Efficient thermally activated delayed fluorescence emitters based on a parallelly aligned bi-spiro-acridine donor

“…The discovery of thermally activated delayed fluorescence (TADF) emitters has brought organic light emitting diodes (OLEDs) into a new era. 1–22 Pure organic emitters that could fully recycle both singlet and triplet excitons offer a great possibility of being employed in material construction and strengthen the pace of OLEDs towards commercialization. The recent achievement of an ultra-high external quantum efficiency (EQE) of 40% milestone together with narrowband electroluminescence (EL) emission, that could fulfill the newly defined International Telecommunication Union (ITU) Recommendation BT 2020 (Rec.…”

“…1 As a result, excellent emitters based on donor (D) and acceptor (A) construction via various connections such as single bonds, spiro-junctions and through space charge transfer are assembled. 5,7,10,22,23 Besides connection patterns, the selection of D and A units shares an equal importance to promote the material performance. Till now, plenty of A groups, such as sulphones, 5,24,25 benzophenones, [26][27][28][29][30] triazines, 21,31,32 organic borons, [33][34][35] naphthalimides, 19,[36][37][38] and pyrazines, [39][40][41][42] have been adopted in TADF emitters which realize high EL performances.…”

Machine Learning-assisted Exploration of a Universal Polymer Platform with Charge Transfer-dependent Full-color Emission

“…In general, color-tunable fluorescence in polymer systems can be achieved either by direct emission spectra combination [17][18][19] or Förster resonance energy transfer (FRET) 20,21 . By modulation of energy transfer efficiency, the latter can generate more tunable emission properties, and is therefore widely used in stimuli-responsive materials 22,23 , ratiometric sensors 24,25 multicolor bioimaging agents 26,27 , security inks 28 , and light-harvesting systems 29 .…”

Design, synthesis, and properties of polystyrene‐based through‐space charge transfer polymers: Effect of triplet energy level of electron donor moiety on delayed fluorescence and electroluminescence performance

“…1 Different from TADF polymers with π-conjugated D-A structure and TBCT emission, TADF polymers with π-stacked D-A architectures and through-space charge transfer (TSCT) emission have been reported by our group to realize blue TADF emission. [34][35][36][37][38][39][40] Due to the non-conjugated linkage of donor and acceptor, throughspace charge transfer, rather than through-bond charge transfer occurs in these polymers. In general, TSCT polymers share two merits.…”

“…Second, spatially-separated donor and acceptor results in small overlap of HOMO and LUMO distributions, which is beneficial to achieve small ΔE ST and strong TADF effect. [41][42][43][44][45][46][47][48][49][50] By modulating through-space donor-acceptor interaction with rigid polymer skeleton and bridged donor/acceptor moieties, TSCT polymers with full-color and white emission have been developed, 35,39,40 providing an effective approach toward novel luminescent polymers for solution-processed OLEDs.…”