Circularly polarized organic room temperature phosphorescence activated by liquid crystalline polymer networks

Huang, Ao; Huang, Jiang; Luo, Hui-Ying; Luo, Zhi‐Wang; Wang, Pu; Wang, Ping; Guan, Yan; Xie, He‐Lou

doi:10.1039/d2tc04829a

Cited by 18 publications

(18 citation statements)

References 65 publications

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“…(c) Schematic diagram of the preparation route for the liquid crystalline polymer network with CPRTP and molecular structures of the chiral dopant (( R / S )-B- n -CzO) and the host N-LC (LC-242). Reproduced with permission from ref . Copyright 2023 Royal Society of Chemistry.…”

Section: Construction Of Polymer-based Rtp Systemsmentioning

confidence: 99%

Recent Advances of Pure Organic Room Temperature Phosphorescence Based on Functional Polymers

Ding,

Ma,

Tian

2023

Acc. Mater. Res.

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Conspectus The phosphorescence is produced by the radiative transition of the excited triplet state which is generated by the intersystem crossing (ISC) from the excited singlet state. Compared with fluorescence, it has a longer luminescence lifetime and larger Stokes shift, so phosphorescent materials have great application value in fields such as displays, anticounterfeiting, and imaging. But due to the low ISC rate of organic molecules, the slow radiative transition rate of the triplet state, and the large nonradiative energy loss caused by molecular vibration, pure organic room temperature phosphorescence (RTP) is usually difficult to obtain. Among the most widely used strategies including crystal assembly, polymerization, and host–guest encapsulation, the polymerization strategy based on rigid polymers has achieved great success and widespread attention due to their easy processing and excellent luminescence performance. The main function of polymers is to fix the luminophore into the matrix and suppress the energy loss of the triplet state caused by nonradiative transitions and oxygen quenching. That is, polymers provide a rigid microenvironment necessary for the RTP, although some polymers are flexible and stretchable. Conventional polymers have limited interaction with luminophores and do not have the function of promoting triplet states. Therefore, the high RTP quantum yield depends more on the structural design of luminophores. By modification of the structure, functionalized polymers can be endowed with the ability to regulate the singlet and triplet energy levels of luminophores, enhance ISC, and increase the quantum yield of RTP. The selection of functionalized polymers also enriches the diverse properties of RTP materials. This Account summarizes the latest research progress in the field of polymer-based RTP and RTP enhancement by functionalized polymers. Luminophores are used to construct RTP systems by doping, covalent linking, or supramolecular interactions with polymers such as PAA, PMMA, PVA, and PAM. To further strengthen polymer rigidity, secondary processing has been successfully employed to synergistically suppress nonradioactivation and enhance RTP performance, such as hydrogen bonding bridges, host–guest encapsulation, and cross-linking. The function of polymers is no longer limited to suppressing nonradiative transitions but also includes enhancing the yield of triplet states and generating special luminescence phenomena. A few functionalized polymers are specially designed to utilize external heavy atom effects, dipole–dipole interactions, and electrostatic and diffusion interactions with the luminophores to promote the ISC rate. Due to the diversification and functionalization of polymers, RTP systems were developed with various special luminescence phenomena such as photoactivation, excitation wavelength dependence, photochromism, circularly polarized RTP, and stimulus-response. We hope the summarized functions and development trends of polymers in RTP systems can provide helpful gui...

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Section: Construction Of Polymer-based Rtp Systemsmentioning

confidence: 99%

Recent Advances of Pure Organic Room Temperature Phosphorescence Based on Functional Polymers

Ding,

Ma,

Tian

2023

Acc. Mater. Res.

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“…Cross-linking networks that utilize liquid crystalline polymers as matrices for chiral dyes have the potential to induce intense CPL. Xie et al doped a series of chiral compounds by combining binaphthol and carbazole-dibenzofuran into a commercially available liquid crystalline to fabricate CP-RTP materials using liquid crystal self-assembly and UV-light-induced cross-linking interactions (Scheme 3f) 28 . The resulting system Template for SYNLETT Thieme exhibited strong CP-RTP with a high glum value of 0.098.…”

Section: Synlett Account / Synpactsmentioning

confidence: 99%

Initialing Circularly Polarized Room-Temperature Phosphorescence from Purely Organic Luminophore Aggregate

Huang

2023

Synlett

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The newly emerging circularly-polarized room-temperature phosphorescence (CP-RTP) has experienced rapid growth due to its intriguing photophysical properties and wide-ranging potential applications. Of particular interest are the purely organic CP-RTPs, as they offer excellent biocompatibility, versatile tunability, and cost-effectiveness. Therefore, these materials show promising applications, including biological imaging, photodiodes, intelligent sensing, information storage, and three-dimensional displays. To deepen our understanding of the luminescence mechanism and broaden the envisioned scope, herein, we summarize them based on chirality character, including point, axial, planar, and other chiral systems. This review aims to scrutinize missing clues and envision future development of the area.

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“…Currently, metal-free circularly polarized RTP (CPRTP) materials can be divided into three categories according to the composition of the architecture: organic small molecules, , polymers, , and organic–inorganic hybrid systems. , Crystal-induced phosphorescence is an effective strategy for organic small molecules to achieve RTP. Duan and co-workers achieved long-persistent CPRTP for the first time in chiral organic ion crystals.…”

Section: Introductionmentioning

confidence: 99%

“…22−24 Although phosphorescent materials have made great progress in achieving long lifetimes and high quantum yields (QYs), 25,26 novel RTP materials with CPL properties are still rarely investigated. Currently, metal-free circularly polarized RTP (CPRTP) materials can be divided into three categories according to the composition of the architecture: organic small molecules, 27,28 polymers, 29,30 and organic−inorganic hybrid systems. 31,32 Crystal-induced phosphorescence is an effective strategy for organic small molecules to achieve RTP.…”

Section: Introductionmentioning

confidence: 99%

Circularly Polarized Room-Temperature Phosphorescence with an Ultrahigh Dissymmetry Factor from Carbonized Polymer Dots by Stacked Chiral Photonic Films

Jiang

Fan

Guo

et al. 2023

ACS Appl. Mater. Interfaces

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Developing circularly polarized room-temperature phosphorescent (CPRTP) materials with a high dissymmetry factor (g lum) and long afterglow is very attractive but highly challenging. Here, a CPRTP emission featuring ultrahigh g lum value and desired visualization characteristic in a bilayer composite photonic film is achieved for the first time. In the constructed system, N and P co-doped carbonized polymer dots (NP-CPDs) are dispersed into polyvinyl alcohol (PVA) as the phosphorescent emitting layer, and helically structured cholesteric polymer films are used as selective reflective layers to convert the unpolarized emission of NP-CPDs into circularly polarized emission. On the basis of the modulation of the helical structure period of the cholesteric polymer, the bilayer composite film enables NP-CPDs to obtain a high g lum value. Notably, the optimized photonic film emits CPRTP with g lum as high as 1.09 and a green afterglow lasting above 8.0 s. Moreover, the composite photonic array films featuring information encryption characteristics are developed by modulating the liquid crystal phase of the cholesteric polymer film and the dot coating position of the NP-CPDs/PVA layer, thus expanding the application of CPRTP materials in cryptography and anti-counterfeiting.

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Circularly polarized organic room temperature phosphorescence activated by liquid crystalline polymer networks

Abstract: Circularly polarized luminescent (CPL) materials have attracted many attentions due to their potential applications in 3D imaging, anti-counterfeiting, etc. However, it is still a great challenge to achieve circularly polarized...

Cited by 18 publications

References 65 publications

Recent Advances of Pure Organic Room Temperature Phosphorescence Based on Functional Polymers

Recent Advances of Pure Organic Room Temperature Phosphorescence Based on Functional Polymers

Initialing Circularly Polarized Room-Temperature Phosphorescence from Purely Organic Luminophore Aggregate

Circularly Polarized Room-Temperature Phosphorescence with an Ultrahigh Dissymmetry Factor from Carbonized Polymer Dots by Stacked Chiral Photonic Films

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