Luminescent liquid crystals containing a sulphur-based heterocyclic core

Tuzimoto, Patricia; Santos, Deise Menezes; Moreira, Thamires dos Santos; Cristiano, Rodrigo; Bechtold, Ivan H.; Gallardo, Hugo

doi:10.1080/02678292.2014.903003

Cited by 51 publications

(13 citation statements)

References 56 publications

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“…[21][22][23][24][25][26][27][28][29][30][31][32][33] Herein we review luminescent LC materials and discuss their LC and emission properties in the context of linearly polarised electroluminescence. [21][22][23][24][25][26][27][28][29][30][31][32][33] Herein we review luminescent LC materials and discuss their LC and emission properties in the context of linearly polarised electroluminescence.…”

Section: Introductionmentioning

confidence: 99%

“…Owing to the combination of the optoelectronic characteristics of luminescent materials with the unique properties of anisotropic fluids that can be easily aligned, luminescent LC materials are a particularly enticing family of materials for polarised OLEDs. [23][24][25][26][27][28][29][30][31][32][33][34][35] Herein we review luminescent LC materials and discuss their LC and emission properties in the context of linearly polarised electroluminescence. First we briefly introduce the main techniques to prepare aligned films, as it is a key requirement for polarised emission.…”

Section: Introductionmentioning

confidence: 99%

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Recent progress in luminescent liquid crystal materials: design, properties and application for linearly polarised emission

et al. 2015

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Luminescent liquid crystals (LCs) materials have attracted significant interests for organic optoelectronic applications, especially for linearly polarised emission, becaused of their combination of ordered alignment and luminescence property. Since the first polarised organic light-emitting diodes (OLEDs) demonstration in 1995, remarkable progress has been done with polarised electroluminescence because of continuous advances with the design of suitable LC materials. In this Review, we summarize luminescent LC materials with representative examples based on fluorescent materials, phosphorescent materials, and lanthanide complexes. The structure-property relationships for polarised emission and, when available, electroluminescence of these materials are presented and discussed, with a focus on phosphorescent metallomesogens. We also present the rational behind the design and development of luminescent LCs materials for high efficiency polarised OLEDs, along with the challenges ahead to achieve efficient devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recent progress in luminescent liquid crystal materials: design, properties and application for linearly polarised emission

et al. 2015

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“…There are many reports in the literatures on 1,2,4-oxadiazole heterocycle derivatives with good thermal stability and emission in the blue region of the visible electromagnetic spectrum [17][18][19][20]. Liquid crystalline compounds can present interesting optical and mesomorphic properties influenced by the curvature [21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 98%

New liquid crystals derived from thiophene connected to the 1,2,4-oxadiazole heterocycle

2016

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In this study, eight new compounds derived from thiophene were synthesised and characterised. The four symmetrical compounds contain two heterocyclic 1,2,4-oxadiazole on each side of the 2,5-disubstituted thiophene, and the four non-symmetrical compounds contain alkyne groups as a spacer replacing one of these heterocycles. Some of the compounds presented liquid crystalline properties with smectic and nematic mesophases. The non-symmetrical compounds presented low emission of blue light. ARTICLE HISTORY

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“…rod-like, [6,8,10,[21][22][23][24][25] V-shaped, [26] star-shaped [27] and discotic [16,20] cores). Any extension of the core generally causes a significant increase in the transition temperatures.…”

Section: Introductionmentioning

confidence: 98%

Extended conjugated mesogens: synthesis and mesomorphic properties of H-shaped mesogens based on 3,3ʹ,5,5ʹ-tetrasubstituted 2,2ʹ-bithiophene with oligo(1,4-phenyleneethynylene) arms

Yatabe

Kawanishi

2016

Liquid Crystals

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A new class of extended conjugated mesogens, namely H-shaped mesogens based on 3,3ʹ,5,5ʹ-tetrasubstituted 2,2ʹ-bithiophene with oligo(1,4-phenyleneethynylene) arms, have been synthesised, and the relationships between molecular structures and mesomorphic properties investigated. Tetraalkyl, tetraalkoxy and dialkyldialkoxy derivatives, [R 1 C 6 H 4 CCC 6 H 2 (C 2 H 5 ) 2 CC] 2 [R 2 C 6 H 4 CCC 6 H 2 (C 2 H 5 ) 2 CC] 2 C 8 H 2 S 2 where R 1 and R 2 = alkyl and alkoxy chains of different lengths, exhibit nematic phases. The length, number and position of the terminal chains strongly affect the mesomorphic properties. The tetraalkyl derivatives in which R 1 = R 2 = pentyl to heptyl exhibit enantiotropic mesophases, whereas the derivatives with octyl or nonyl chains exhibit monotropic mesophases. The tetraalkoxy derivatives in which R 1 = R 2 = pentyloxy to nonyloxy all exhibit enantiotropic nematic phases. The mesophase range increases with increasing alkoxy chain length, except that the octyloxy and nonyloxy derivatives have almost the same temperature range. The dialkyldialkoxy derivatives in which R 1 = alkyl; R 2 = alkoxy and in which R 1 = alkoxy; R 2 = alkyl (R 1 and R 2 = heptyl, nonyl, hexyloxy or nonyloxy) exhibit enantiotropic mesophases. The derivatives in which R 1 = alkoxy have a significantly lower crystal-nematic transition temperature than the corresponding derivatives (R 2 = alkoxy), although the two types of derivatives have a similar nematic-isotropic transition temperature. ARTICLE HISTORY

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Luminescent liquid crystals containing a sulphur-based heterocyclic core

Cited by 51 publications

References 56 publications

Recent progress in luminescent liquid crystal materials: design, properties and application for linearly polarised emission

Recent progress in luminescent liquid crystal materials: design, properties and application for linearly polarised emission

New liquid crystals derived from thiophene connected to the 1,2,4-oxadiazole heterocycle

Extended conjugated mesogens: synthesis and mesomorphic properties of H-shaped mesogens based on 3,3ʹ,5,5ʹ-tetrasubstituted 2,2ʹ-bithiophene with oligo(1,4-phenyleneethynylene) arms

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