Highly efficient full-color and white circularly polarized luminescent nanoassemblies and their performance in light emitting devices

Li, Yang; Huang, Juexin; Qin, Minggao; Ma, Xiaoyu; Dou, Xiaoqiu; Feng, Chuanliang

doi:10.1039/d0nr00279h

Cited by 53 publications

(45 citation statements)

References 49 publications

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“…Chiral functional materials with circularly polarized luminescence (CPL) performance are drawing enormous attention in multidisciplinary fields for their potential applications in 3D optical displays, optical identification sensors, spintronics, optical storage devices, etc. [ 1–11 ] In the past few years, with the deepening of cross‐disciplinary research and rapid development of precision instruments, numerous CPL‐active materials based on organic small molecules, [ 12–15 ] polymers, [ 16–19 ] supramolecular self‐assemblies, [ 20–24 ] lanthanide complexes, [ 25,26 ] and liquid crystals [ 27–29 ] have been exploited. For CPL‐active materials, luminescence dissymmetry factor ( g lum ) is a critical parameter for judging the material performance, [ 30 ] in which the maximum | g lum | value is 2 when absolutely left‐handed or right‐handed CPL emission is generated.…”

Section: Introductionmentioning

confidence: 99%

Color‐Tunable Circularly Polarized Luminescence with Helical Polyacetylenes as Fluorescence Converters

Zhao

Gao

Lü

et al. 2020

Advanced Optical Materials

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parameter for judging the material performance, [30] in which the maximum |g lum | value is 2 when absolutely left-handed or right-handed CPL emission is generated. Nevertheless, the |g lum | values of most reported CPL-active materials are mainly located between 10 −5 and 10 −2 , which are far from our expectation and cannot satisfy the demands for future applications. On the other hand, it is well-acknowledged that multicolor emissions especially RGB colors are important in display technology. Therefore, in consideration of the demands in practical applications, constructing CPL-active materials with both color-tunable emissions and high g lum values is of great significance. In the previous study, we have reported that chiral polyacetylenes with helical structures are good candidates for constructing CPL-active materials with high g lum values up to 10 −1. [31] Subsequently, we found that chiral helical polyacetylenes could serve as handedness-selective fluorescence filters to powerfully transform unpolarized fluorescent light into CPL emission. [32] Following this strategy, full-color and white-color CPL-active materials were easily constructed by combining chiral helical polyacetylenes with achiral fluorescence dyes. [32,33] Based on the above investigations, the relationship between helical structures and light shows unique charm and deserves more attention. The importance of such direction is more clearly demonstrated when considering the widespread helical structures and circularly polarized light in nature and living organisms. [34-38] In this contribution, we report our success in fabricating color-tunable CPL emissions by taking helical polyacetylenes as fluorescence converters. When blue-color circularly polarized light passes through the helical polyacetylenes with different conjugated lengths, multicolor CPL emissions of cyan, green, and orange are obtained, with high g lum values in the range of 10 −2-10 −1. It should be pointed out that, in spite of some publications concerning multicolor CPL materials reported by our group and others, [32,33,39-42] the multicolor CPLs therein are mainly realized from various fluorescent substances with different emission wavelength. In the present study, however, color-tunable CPL emissions are conveniently achieved from a single fluorescence substance, merely by tuning the conjugated length of helical polyacetylenes with commercial organic solvents. In particular notably, neither any covalent nor noncovalent interaction is required during the CPL color-tuning process, demonstrating the universality and superiority of the strategy established in the present work. Circularly polarized luminescence (CPL) materials are currently drawing rapidly increasing interest. However, constructing color-tunable CPL materials is still a big challenge, primarily due to the lack of simple, powerful, and universal preparation strategies. In this contribution, color-tunable CPL emissions are easily realized by taking helical polyacetylenes as fluorescence converters. The investigat...

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Section: Introductionmentioning

confidence: 99%

Color‐Tunable Circularly Polarized Luminescence with Helical Polyacetylenes as Fluorescence Converters

Zhao

Gao

Lü

et al. 2020

Advanced Optical Materials

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“…In the previous study of CPL functional materials, it was found that the chiral photoluminescence compounds always possess poor g lum but good quantum yields, whereas the composites of chiral supramolecular architectures and photoluminescent molecules may lead to improved g lum but poor quantum yields. The typical examples include NK‐1020 [6a] (| g lum |=10 −1 , Φ =7.5 %) and the anthracene and pyrene derivatives [6g] (| g lum |=10 −3 , Φ =48 %). The interplay of both criteria may be related to the intrinsic structure involved with the electric transition moment and magnetic transition dipole moments [3, 4] .…”

Section: Resultsmentioning

confidence: 99%

Circularly Polarized Luminescence of Achiral Metal–Organic Colloids and Guest Molecules in a Vortex Field

Huang

et al. 2021

Chemistry A European J

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Recently, scientists have reported a range of chiral fluorescence materials or chiral composites that can emit circularly polarized luminescence. Herein, two achiral metal–organic colloidal solutions were studied, showing active circularly polarized luminescence, which is observed in vortex stirring. The absolute values for glum are 0.05 and 0.03 and the plus or minus sign of glum depends on the colloidal structure and stirring direction, which make the property easy to manipulate. Further, the host–guest interaction study suggests both electrostatic interactions and coordination bonding may influence the chiroptical property from the colloidal solution to the guest molecule. Rhodamine 6G and its carboxylic acid derivative exhibit good quantum yields and acceptable glum values in the colloidal solution.

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“…[ 10b,c,29 ] To date, only one case that white CPL materials in pairs for assembling WCPLEDs has been reported due to their complicated synthesis or poor processability. [ 30 ] However, the thermal stability of this supramolecular systems is poor. Since lighting devices often operate at high temperatures, it is necessary to develop high‐temperature resistant CPL‐active materials.…”

Section: Figurementioning

confidence: 99%

Enantiomeric MOF Crystals Using Helical Channels as Palettes with Bright White Circularly Polarized Luminescence

et al. 2020

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The host–guest chemistry of metal–organic frameworks (MOFs) has enabled the derivation of numerous new functionalities. However, intrinsically chiral MOFs (CMOFs) with helical channels have not been used to realize crystalline circularly polarized luminescence (CPL) materials. Herein, enantiomeric pairs of MOF crystals are reported, where achiral fluorophores adhere to the inner surface of helical channels via biology‐like H‐bonds and hence inherit the helicity of the host MOFs, eventually amplifying the luminescence dissymmetry factor (glum) of the host l/d‐CMOF (±1.50 × 10−3) to a maximum of ±0.0115 for the composite l/d‐CMOF⊃fluorophores. l/d‐CMOF⊃fluorophores in pairs generate bright color‐tunable CPL and almost ideal white CPL (0.33, 0.32) with a record‐high photoluminescence quantum yield of ≈30%, which are further assembled into a white circularly polarized light‐emitting diode. The present strategy opens a new avenue for propagating the chirality of MOFs to realize universal chiroptical materials.

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Highly efficient full-color and white circularly polarized luminescent nanoassemblies and their performance in light emitting devices

Abstract: Achiral commercial aromatic molecules co-assembly with chiral phenylalanine derived gelators exhibiting strong full-color and white CPL with high glum values via chirality transfer.

Cited by 53 publications

References 49 publications

Color‐Tunable Circularly Polarized Luminescence with Helical Polyacetylenes as Fluorescence Converters

Color‐Tunable Circularly Polarized Luminescence with Helical Polyacetylenes as Fluorescence Converters

Circularly Polarized Luminescence of Achiral Metal–Organic Colloids and Guest Molecules in a Vortex Field

Enantiomeric MOF Crystals Using Helical Channels as Palettes with Bright White Circularly Polarized Luminescence

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