Development of Laser Dyes to Realize Low Threshold in Dye‐Doped Cholesteric Liquid Crystal Lasers

Uchimura, Makoto; Watanabe, Y.; Araoka, Fumito; Watanabe, Junji; Takezoe, Hideo; Konishi, Gen‐ichi

doi:10.1002/adma.201001046

Cited by 97 publications

(52 citation statements)

References 36 publications

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“…For laser applications, the order parameter of a dye is not as crucial to its practical use as it is for display applications, although the orientation of the TDM of a dye can affect the lasing wavelength, [55] and the order parameter can determine the efficiency of the laser. [56] For lasing to occur in a liquid crystal laser, a high molar absorption coefficient, a high quantum yield of emission and a high degree of stability and solubility are all important characteristics, [55] and as such, studies have focused on different dye classes to those above, such as merocyanines, [57] pyrenes, [58] anthracenes [55] and pyrromethenes. [57] Some examples of structures from these dye classes are shown in Figure 5 …”

Section: Other Dyesmentioning

confidence: 99%

Dyes as guests in ordered systems: current understanding and future directions

Sims

2016

Liquid Crystals

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The optical properties of dyes dissolved in liquid crystals have led to their proposed use in a diverse range of practical applications. Such guest-host systems are typically required to fulfil a range of criteria relating to their absorption properties, degree of alignment and stability, but concurrently satisfying these requirements has proven a barrier to their widespread use. In this article, many of the proposed applications and their requirements are discussed, and an outline of some of the most prevalent classes of dye proposed in the context of guest-host systems is given, along with a summary of recent reports of dyes that exhibit thermotropic mesophases. Theoretical approaches to describing the alignment within guest-host systems are outlined, and possible strategies for the future rational design of guest-host systems are discussed. ARTICLE HISTORY

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Section: Other Dyesmentioning

confidence: 99%

Dyes as guests in ordered systems: current understanding and future directions

Sims

2016

Liquid Crystals

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“…17 These materials find applications in organic electronics such as organic photovoltaic cells, 18 organic light- 40 emitting diodes, 19 organic field-effect transistors 20 and organic lasers. 21 All these tremendous physico-chemical properties initially lie on the remarkable progresses achieved on pyrene functionalization. Nowadays, all pyrene positions can be 45 substituted.…”

Section: Introductionmentioning

confidence: 99%

Towards sustainable synthesis of pyren-1-yl azoliums via electrochemical oxidative C–N coupling

et al. 2015

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Electrosynthesis of 1-methyl-3-(pyren-1-yl)-1H-imidazol-3-ium tetrafluoroborate via oxidative C-N coupling of pyrene with methylimidazole is optimized with the aim to reduce waste and simplify the experimental setup. Several parameters are tested such as cell configuration (number of compartments), pyrene concentration, amount of nucleophile, electrosynthetic method (potentiostatic/galvanostatic), 10 amount of electrons, atmosphere (Ar/air), solvent quality and presence/absence of supporting electrolyte. The optimized conditions are successfully applied to the synthesis of 1-methyl-3-(pyren-1-yl)-1Hbenzimidazol-3-ium tetrafluoroborate, 1-methyl-4-(pyren-1-yl)-1H-1,2,4-triazol-4-ium tetrafluoroborate and 3-(pyren-1-yl)-benzothiazol-3-ium tetrafluoroborate. These four pyren-1yl-azolium salts are characterized by NMR, MS, elemental analysis, UV-Vis. absorption and emission spectroscopies. The X-15 ray crystallographic structures of 1-methyl-3-(pyren-1-yl)-1H-imidazol-3-ium tetrafluoroborate and 1methyl-3-(pyren-1-yl)-1H-benzimidazol-3-ium tetrafluoroborate are presented.

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“…For example, solvatochromism, which is a typical response of a dye to its environment, is indispensable in the use of dyes as imaging tools. [4] However, to the best of our knowledge, dyes exhibiting both high QYs and strong solvatochromism in response to changes from apolar to polar media have not been developed. [6][7][8][9][10][11][12][13][14][15][16][17] In addition, a high fluorescence quantum yield (QY) is important for the aforementioned applications and is generally achieved by extending the p-conjugation systems of appropriate chromophores, [18] for example, as observed in the relationship between pyrene (F Fl = 0.26 in chloroform) [19] and 1,3,6,8-tetraarylpyrene (F Fl % 0.90 in dichloromethane).…”

mentioning

confidence: 99%

Solvatochromic Pyrene Analogues of Prodan Exhibiting Extremely High Fluorescence Quantum Yields in Apolar and Polar Solvents

Niko

Kawauchi

Konishi

2013

Chemistry A European J

Self Cite

145

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True colors: Novel pyrene analogues of Prodan exhibit outstanding photophysical properties with remarkably high fluorescence quantum yield (QY) in solvents ranging from apolar hexane to polar methanol (see figure). This is accompanied by strong solvatochromism and large Stokes shifts. These properties have not been previously achieved in enormous solvatochromic dyes, but are quite useful for emitting materials and imaging tools.

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Development of Laser Dyes to Realize Low Threshold in Dye‐Doped Cholesteric Liquid Crystal Lasers

Cited by 97 publications

References 36 publications

Dyes as guests in ordered systems: current understanding and future directions

Dyes as guests in ordered systems: current understanding and future directions

Towards sustainable synthesis of pyren-1-yl azoliums via electrochemical oxidative C–N coupling

Solvatochromic Pyrene Analogues of Prodan Exhibiting Extremely High Fluorescence Quantum Yields in Apolar and Polar Solvents

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