Heavy-atom-free amorphous materials with facile preparation and efficient room-temperature phosphorescence emission

Zhao, Chengcheng; Jin, Yan-Huan; Wang, Jie; Cao, Xiaoming; Ma, Xiang; Tian, He

doi:10.1039/c9cc01594a

Cited by 25 publications

(24 citation statements)

References 35 publications

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“…Charge transfer in dative bonds enhances the probability of spin–orbit coupling, thereby improving the rate of ISC to populate the triplet excitons. − Meanwhile, the dative bonding between phenylboronic acid and acrylamide groups can restrict the phosphors to reduce the nonradiative relaxation. − The combination of these two effects of dative bonds leads to pure organic RTP polymers. In addition, hydrogen bonding among polymer chains in BAA can suppress the motion of the phosphors and shield the quenchers, which increases the intensity and the lifetime of RTP. − …”

Section: Resultsmentioning

confidence: 99%

Self-Healing Amorphous Polymers with Room-Temperature Phosphorescence Enabled by Boron-Based Dative Bonds

Hui

Zhu

et al. 2019

ACS Appl. Polym. Mater.

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Dative bonds are crucial for room-temperature phosphorescence (RTP) of metal complexes, which are nevertheless of high cost and toxicity. Here, we develop a class of amorphous RTP polymers based on nonmetal dative bonds through copolymerizing vinylphenylboronic acid and acrylamide derivatives. Nonmetal dative bonds, formed between boron and nitrogen/oxygen atoms, can populate triplet excitons through charge transfer and immobilize phosphors to suppress nonradiative relaxation, leading to effective RTP lifetime in air. Moreover, the dynamic nature of the dative bonds enables self-healing and anticounterfeiting abilities of the RTP polymers. The concept of designing nonmetal dative bonds can widely expand the horizon and application of RTP polymers.

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Section: Resultsmentioning

confidence: 99%

Self-Healing Amorphous Polymers with Room-Temperature Phosphorescence Enabled by Boron-Based Dative Bonds

Hui

Zhu

et al. 2019

ACS Appl. Polym. Mater.

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“…Ma et al. connected different phosphors with β‐CD to obtain several amorphous materials with efficient RTP of different colors of emission (Figure a) . Strong intermolecular hydrogen bonding between CDs restricts the vibration of the phosphors and suppresses the nonradiative relaxation process, improving the phosphorescence quantum yield.…”

Section: Amorphous Small Moleculesmentioning

confidence: 99%

Molecular Engineering for Metal‐Free Amorphous Materials with Room‐Temperature Phosphorescence

Tian

Zhang

et al. 2020

Angewandte Chemie

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Materials displaying room‐temperature phosphorescence (RTP) have been attracting wide attention in recent years due to their distinctive characteristics including long emissive lifetime and large Stokes shift, and their various applications. Most synthesized RTP materials are metal complexes that display enhanced intersystem crossing and crystallization is a common way to restrict nonradiative transition. Amorphous metal‐free RTP materials, which do not rely on expensive and toxic metals and can be prepared in a straightforward fashion, have become an important branch of the field. This Minireview summarizes recent progress in amorphous RTP materials according to the approaches used to immobilize phosphors: host–guest interactions, molecule doping, copolymers, and small‐molecule self‐assembly. Some existing challenges and insightful perspectives are given at the end of the Minireview, which should benefit the future design and development of amorphous metal‐free RTP materials.

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“…Indeed, the last decade has witnessed the rapid development of nascent RTP materials emitting bright and/or persistent luminescence at ambient conditions [1] . Along with this exciting progress, several molecular design strategies have been proposed to guide the rational development of heavy‐atom free RTP materials, [12] such as the incorporation of a lone‐pair electron moiety (i.e., carbonyl group), [13] narrowing singlet–triplet gaps in twisted donor–acceptor molecules, [14] host–guest complexation, [15] polymerization, [16, 17] packing efficiency tuning, [18] H‐bond immobilization, [19] and supramolecular interaction [20] …”

Section: Introductionmentioning

confidence: 99%

A Descriptor for Accurate Predictions of Host Molecules Enabling Ultralong Room‐Temperature Phosphorescence in Guest Emitters

et al. 2022

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Although doping can induce room-temperature phosphorescence (RTP) in heavy-atom free organic systems, it is often challenging to match the host and guest components to achieve efficient intersystem crossing for activating RTP. In this work, we developed a simple descriptor ΔE to predict host molecules for matching the guest RTP emitters, based on the intersystem crossing via higher excited states (ISCHES) mechanism. This descriptor successfully predicted five commercially available host components to pair with naphthalimide (NA) and naphtho[2,3-c]furan-1,3-dione (2,3-NA) emitters with a high accuracy of 83 %. The yielded pairs exhibited bright yellow and green RTP with the quantum efficiency up to 0.4 and lifetime up to 1.67 s, respectively. Using these RTP pairs, we successfully achieved multi-layer message encryption. The ΔE descriptor could provide an efficient way for developing doping-induced RTP materials.

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Heavy-atom-free amorphous materials with facile preparation and efficient room-temperature phosphorescence emission

Abstract: Amorphous pure organic room-temperature phosphorescent small molecules without heavy atoms were designed and facilely prepared via modification of heavy-atom-free luminophores onto β-cyclodextrin.

Cited by 25 publications

References 35 publications

Self-Healing Amorphous Polymers with Room-Temperature Phosphorescence Enabled by Boron-Based Dative Bonds

Self-Healing Amorphous Polymers with Room-Temperature Phosphorescence Enabled by Boron-Based Dative Bonds

Molecular Engineering for Metal‐Free Amorphous Materials with Room‐Temperature Phosphorescence

A Descriptor for Accurate Predictions of Host Molecules Enabling Ultralong Room‐Temperature Phosphorescence in Guest Emitters

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