Control of circularly polarized luminescence from a boron ketoiminate-based π-conjugated polymer <i>via</i> conformational locks

Li, Junfeng; Peng, Xuelei; Huang, Chao; Qi, Qi; Lai, Wen‐Yong; Huang, Wei

doi:10.1039/c8py01209a

Cited by 36 publications

(30 citation statements)

References 72 publications

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“…Moreover, the important role of PF backbone conformation in the spectral properties of this type of TTA-UC systems can be used for tuning on-demand the response of upconverted circularly polarized luminescence. [52][53][54] Essentially, the proposed mechanism for TTA-UC generation provides generic guidelines for a simple and low-cost protocol to develop low-cost and easily processable TTA-UC polymeric coating platforms. Storage of photon energy can be enabled by properly designed triplet annihilator/sensitizer species, after engineering their tendency to segregate.…”

Section: Discussionmentioning

confidence: 99%

Impact of molecular conformation on triplet-fusion induced photon energy up-conversion in the absence of exothermic triplet energy transfer

et al. 2019

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Section: Discussionmentioning

confidence: 99%

Impact of molecular conformation on triplet-fusion induced photon energy up-conversion in the absence of exothermic triplet energy transfer

et al. 2019

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“…In recent years, organic π-conjugated functional materials [1][2][3], especially chiroptical materials featuring with circularly polarized luminescence (CPL), have attracted growing interest for their wide potential applications in threedimensional (3D) optical displays [4], optical storage and processing systems [5], color-image projection [6], liquid crystal lasers [7], biological probes and signatures [8], security tags [9], light-emitting diodes [10][11][12], and, especially, backlighting liquid crystal displays [13]. Concerning CPLactive materials, one of the major targets is to achieve a large luminescence dissymmetry factor (g lum ), which reflects the level of CPL properties.…”

Section: Introductionmentioning

confidence: 99%

Boosting Circularly Polarized Luminescence of Organic Conjugated Systems via Twisted Intramolecular Charge Transfer

Hou

Huang

et al. 2020

Research

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Realizing a high luminescence dissymmetry factor (glum) is a paramount yet challenging issue in the research field of circularly polarized luminescence (CPL). Here, we reported a novel set of organic conjugated systems with twisted intramolecular charge transfer (TICT) characteristics based on conjugated o-carborane-binaphthyl dyads composing of binaphthyl units as chiral electron donors and o-carborane units as achiral electron acceptors, demonstrating intense CPL with large glum values. Interestingly, single-crystalline o-1 exhibited a high-level brightness and a large glum factor as high as +0.13, whereas single-crystalline o-2 processed a relatively low brightness with a decreased glum value to -0.04. The significant diversity of CPL-active properties was triggered by the selective introduction of o-carborane units onto the binaphthyl units. Benefiting from the large magnetic dipole transition moments in TICT states, the CPL activity of TICT o-carborane-based materials exhibited amplified circular polarization. This study provides an efficient molecular engineering strategy for the rational design and development of highly efficient CPL-active materials.

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“…Photophysical studies UV-visible optical absorption studies of BODIPY derivatives were performed in dichloromethane at a concentration of 1 9 10 À5 M. Absorption spectra of 5aa -5ak showed the absorption maxima at 337 and 505 nm which were assigned to the localized aromatic p-p* transitions (31)(32)(33)(34). However, 5ai possess aryl substituent depict red shift of high energy absorption band to 365 nm whereas 5ah exhibits hypsochromic shift lower energy absorption band to 498 nm and the shoulder observed at 553 nm owing to the strong electron releasing ability of N, N diethyl moiety, increase the electron density at the nitrogen atom, decrease the n-p* transition energy and thereby result the bathochromic shifts towards the longer wavelength.…”

Section: Theoretical Calculationsmentioning

confidence: 99%

Synthesis and Opto‐electronic Properties of BODIPY o‐OPhos Systems

Anitha

Mrinalini

Vani

et al. 2020

Photochem & Photobiology

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Herein, we report the versatile synthetic strategy and opto‐electronic properties for the phosphorylation of BODIPY derivatives 5aa‐5ak by substituting with an electron‐donating/withdrawing group at the ortho position. Nevertheless, this new methodology relatively promotes the tolerance of the aldehyde moiety and the high yield for the synthesis of BODIPY o‐OPhos derivatives. The photophysical studies suggest improved optical properties due to the inductive effect of various electron‐donating/withdrawing groups. The UV‐visible and the emission data suggest that BODIPY o‐OPhos derivatives emphasize the property of the excited states with an increase in fluorescence intensity and high quantum yields due to the presence of bulky phospsho‐triester at the meso‐ position which hinders the free rotation around the C‐Ar bond and facilitates the development of OLEDs and various organophosphorus warfare agents. Electrochemical studies reveal 5ak depicts the ease of redox activity amongst the 5aa‐5ak derivatives. The density functional theory indicates the highest occupied molecular orbital on the BODIPY moiety whereas the lowest unoccupied molecular orbital delocalized on BODIPY and the phospho‐triester moieties. Thus, the unique development of the novel BODIPY derivatives with improved optical and redox properties pave the way for fluorescent probes and bioimaging techniques.

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Control of circularly polarized luminescence from a boron ketoiminate-based π-conjugated polymer via conformational locks

Abstract: Circularly polarized luminescence from a boron ketoiminate-based π-conjugated polymer was successfully realized at the unimolecular level via conformational locks that blocked the intramolecular rotations.

Cited by 36 publications

References 72 publications

Impact of molecular conformation on triplet-fusion induced photon energy up-conversion in the absence of exothermic triplet energy transfer

Impact of molecular conformation on triplet-fusion induced photon energy up-conversion in the absence of exothermic triplet energy transfer

Boosting Circularly Polarized Luminescence of Organic Conjugated Systems via Twisted Intramolecular Charge Transfer

Synthesis and Opto‐electronic Properties of BODIPY o‐OPhos Systems

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