Chiral TADF‐Active Polymers for High‐Efficiency Circularly Polarized Organic Light‐Emitting Diodes

Abstract

A strategy of chiral donor–acceptor copolymerization is proposed to develop chiral nonconjugated polymers with thermally activated delayed fluorescence (TADF). Based on this strategy, two pairs of chiral polymers (R,R)‐/(S,S)‐pTpAcDPS and (R,R)‐/(S,S)‐pTpAcBP were synthesized. The alternating copolymerization of the chiral donors and acceptors could effectively separate the frontier molecular orbitals, which made the polymers show small ΔEST of 0.01–0.03 eV and efficient TADF properties. Moreover, the polymers also showed the quantum yield of up to 92 % and the circularly polarized luminescence. The solution‐processed circularly polarized organic light‐emitting diodes showed circularly polarized electroluminescence signals with high external quantum efficiencies of up to 22.1 % and maximum luminance of up to 34350 cd m−2. This is the first report of CP‐OLEDs based on chiral TADF polymer, which provides a useful and valuable guidance for the development of high‐efficiency CPEL polymers.

Recent Progress in Circularly Polarized Luminescence of [2.2]Paracyclophane Derivatives

“…Circularly polarized luminescence (CPL) has attracted growing interest in recent years [1–9] due to its potential applications in chirality sensing, optical data storage, asymmetric photochemical synthesis, chiroptical materials, optical displays and bio‐responsive imaging [10–16] . However, the applications in such various fields require the chiral emitters to ensure both high photoluminescence quantum yields (PLQY) and high luminescent dissymmetry factors ( g lum ).…”

“…Circularly polarized luminescence (CPL) has attracted growing interest in recent years [1][2][3][4][5][6][7][8][9] due to its potential applications in chirality sensing, optical data storage, asymmetric photochemical synthesis, chiroptical materials, optical displays and bioresponsive imaging. [10][11][12][13][14][15][16] However, the applications in such various fields require the chiral emitters to ensure both high photoluminescence quantum yields (PLQY) and high luminescent dissymmetry factors (g lum ). The g lum is an important parameter to describe the CPL properties of the emitters which come from the difference between the intensity of left-handed and right-handed emission from the emitters.…”

Aromatic-imide-based TADF enantiomers for efficient circularly polarized electroluminescence

“…4 Since the first case of CP-OLEDs was reported in 1997, 5 a variety of chiral emitters suitable for CP-OLEDs have been developed, including chiral fluorescent emitters, 6 chiral phosphorescent emitters, 7 and chiral thermally activated delayed fluorescent (TADF) emitters. 8 Compared with the first two kinds of chiral emitter, chiral TADF emitters have been more widely used to fabricate efficient CP-OLEDs in recent years 9 owing to their purely organic molecular structures and theoretical 100% internal quantum efficiencies. 10 Thus, the development of new chiral TADF molecules is the key issue for obtaining highly efficient CPEL.…”

A three dimensional graphdiyne-like porous triptycene network for gas adsorption and separation

“…Triptycene, [39][40][41][42] with three-dimensional rigid paddlewheellike structure, has been successfully used as building blocks to construct supramolecular systems, [43][44][45][46][47][48] polymeric materials 49,50 and organic porous materials. [51][52][53][54][55][56][57][58][59][60][61][62][63] In this work, triptycene was introduced into GDY scaffold to prevent the closer packing of two-dimensional layers, so that obtain a three dimensional graphdiyne-like porous triptycene network (G-PTN).…”