An Electroactive Pure Organic Room‐Temperature Phosphorescence Polymer Based on a Donor‐Oxygen‐Acceptor Geometry

Liu, Xinrui; Yang, Liuqing; Li, Xuefei; Zhao, Lei; Wang, Shumeng; Lu, Zheng‐Hong; Ding, Junqiao; Wang, Lixiang

doi:10.1002/anie.202011957

Cited by 63 publications

(71 citation statements)

References 44 publications

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“…In response to this problem, Wang et al are committed to constructing electroactive RTP polymer to make it suitable for the fabrication of high-efficiency polymer light-emitting diodes. By adopting the geometric configuration of D-O-A, they designed the polymer P-(DMPAc-O-TPTrz) (Scheme 4) [66] . Compared to the oxygen atom-free D-A system, the introduction of oxygen atoms has been shown to contribute to reducing hole-electron orbital overlap so that CT fluorescence could be suppressed, and enhanced spin-orbit coupling to promote efficient phosphorescence emission.…”

Section: Covalent Polymer Systemsmentioning

confidence: 99%

Recent progress on pure organic room temperature phosphorescent polymers

2021

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So far, pure organic room temperature phosphorescence (RTP) materials are developing rapidly and have become a research hotspot in the scientific community. They are regarded as valuable resources with great potential for development in many fields, such as biomedicine, information multi‐level encryption, smart anti‐counterfeiting, and so on. Among them, a series of pure organic RTP polymer systems emerged at the right moment based on the excellent properties of polymers such as easy processing, low cost, and good biocompatibility. Furthermore, the huge molecular weight, long‐chain intertwined structure, and potential interactions with phosphors of polymers make them a focus for RTP emission. Herein, we describe the development history of this system in detail, explore the necessary factors for highly efficient emission from the phosphorescence emission process, and based on the dual effects of enhancing phosphorescence emission and shortening luminescence lifetime brought by heavy atoms, we summarize the internal mechanism and achievements of various researches from the perspective of heavy atom–containing and non‐heavy atom systems.

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Section: Covalent Polymer Systemsmentioning

confidence: 99%

Recent progress on pure organic room temperature phosphorescent polymers

2021

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“…36 In Figure 4, the anthracene dye (ENDT) was synthesized with weak fluorescence emission at 625 nm. The multi-stage assembly process which resulted from CB [8] and amphiphilic sulfonatocalix [4]arene(SC4AD) greatly improved the luminescence and caused the emission to red shift. First-stage emission enhancement came from macrocyclic host CB [8], the "1:2" and "head-to-tail" binding forms contributed to the linear supramolecular polymer, and this slightly enhanced red-shifted (655 nm) fluorescence.…”

Section: Phosphorescence In Aqueous Solutionmentioning

confidence: 99%

“…The development of purely organic room-temperature phosphorescence materials has received widespread attention owing to its potential applications in anticounterfeiting, 5 biological imaging, 6,7 and optoelectronic materials. 8 Traditionally, organic molecules cannot emit phosphorescence at room temperature or in aqueous solution because of intrinsically weak spin−orbit coupling, which means that excitons could not effectively cross the single state and triplet state. 9 That is, effective phosphorescence emission requires two conditions: one is fast and efficient intersystem crossing (ISC), which means that it facilitates singlet excitons to populate the triplet state, and the other one is slow k nr , which means that it protects the energy of the triplet state from quenching.…”

Section: Introductionmentioning

confidence: 99%

Supramolecular Purely Organic Room-Temperature Phosphorescence

2021

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Conspectus In recent years, purely organic room-temperature phosphorescence (RTP) has aroused wide concern and promotes the development of the supramolecular phosphorescence. Different from organic crystallization, polymerization, or matrix rigidification, supramolecular strategy mainly takes advantage of the synergy between supramolecular co-assembly and strong binding by macrocyclic host compounds (cucurbit[n]urils, cyclodextrins, etc.) to overcome deficiencies such as poor processability and water solubility and improves RTP materials’ quantum efficiency and lifetime in the solid state or in an aqueous solution. Meanwhile, it expands application, especially in aqueous solution, in cell imaging. Therefore, supramolecular phosphorescence will become a new growth point and will have broad application prospects in chemistry, biology, and material science. This Account focuses on the uniquely synergetic advantages of co-assembly and host–guest interaction from macrocyclic hosts for enhancing RTP. This Account starts with a brief introduction of the recent development of organic RTP materials as well as the host–guest interaction and co-assembly. Then, we introduce a supramolecular solid-state RTP strategy involving an ultrahigh phosphorescent quantum yield via the tight encapsulation of macrocyclic host cucurbit[6]uril, an ultralong lifetime via changing the substituents of phosphors, and long-lived and bright RTP by the synergy of host–guest interaction and polymerization. Meanwhile, the applications of solid-state RTP materials for anti-counterfeiting and data encryption are presented. The third part will be the water-phase supramolecular phosphorescence systems constructed by water-soluble macrocyclic host cucurbit[8]uril. Host–guest interaction and polymerization worked together toward efficient phosphorescence in aqueous solution, and the multi-stage assembly promoted phosphorescent applications such as cell targeted imaging and energy transfer. A humidity sensor and data encryption by the conversion of supramolecular hydrogels and xerogels are also involved. In the summary section, we present perspectives and possible research directions for supramolecular phosphorescence. Furthermore, on the basis of previous research, we would like to conclude and propose the developing concept of “macrocycles enhance guest’s phosphorescence”, and this concept not only means that the macrocyclic host limits the movement of the guest compound or promotes interactions between guest compounds but also involves the synergetic enhancement centered on macrocyclic compounds via multi-stage supramolecular assembly which further improves the efficiency of RTP, water solubility, and biocompatibility. And we believe that this concept will be able, together with theory of “assembly-induced emission” and “aggregation-induced emission”, to accelerate the development of purely organic RTP materials.

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“…Room-temperature phosphorescence (RTP) materials with ultralong emission lifetime (>0.1 s) have received considerable attention recently owing to their promising applications in varying fields, including sensing, 1–4 imaging, 5,6 data encryption, 7,8 and organic electronics. 9–11 Unlike most phosphors based on organometallic complexes containing noble metals, metal-free phosphors are rare due to the slow intersystem crossing (ISC) process and serious non-radiative relaxation of triplet excitons under ambient conditions (in air and at room temperature). 12,13 Therefore, various strategies to achieve persistent RTP materials have been developed to promote the ISC process by introduction of heavy atoms (Br, I), 14–17 heteroatoms (N, O, S, P, and so on) 18 or aromatic carbonyl groups, 3,19–23 and to suppress the non-radiative decay process by crystallization engineering, 5,22,24–28 embedding into rigid polymer matrix 3,8,29–31 and formation of supramolecular host–guest complexes.…”

Section: Introductionmentioning

confidence: 99%