An i-line molecular glass photoresist for high resolution patterning

Liu, Juan; Wei, Qi; Wang, Liyuan

doi:10.1039/c3ra45130e

Cited by 3 publications

(2 citation statements)

References 27 publications

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“…S18 (ESI †), the sharp and strong peaks of Cz-CSN-OH revealed its high crystallinity, and the broad and weak signals of HSMGs demonstrated their amorphous states. The amorphous nature of HSMGs are caused by the asymmetric structure of CRA derivatives containing bulky substituent groups, [26,45] which represented that the introduction of NLO chromophores into CRA core molecule could effectively avoid the crystallization of NLO chromophores. The amorphous states of HSMGs are helpful to improving their PR properties.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

“…In addition, as the NLO chromophore was synthesized in advance, the problem that two acceptors were introduced into the 3, 6-position of carbazole caused by post-functionalization could be completely avoided. Furthermore, the rigid 3D CRA core was helpful for maintaining the amorphous state in HSMGs at room temperature [11,26] and decreasing the NLO chromophores antiparallel packing. According to the previous work, [27,28] the methine NLO chromophore, with carbazole as donor and a nitrobenzene and a cyano group as acceptor (Cz-CSN-OH, Scheme 1), was chosen to construct HSMGs firstly, due to its better PR performance than the other chromophores.…”

Section: Introductionmentioning

confidence: 99%

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Photorefractive hyper-structured molecular glasses constructed by calix[4]resorcinarene core and carbazole-based methine nonlinear optical chromophore

Fang(

et al. 2017

Dyes and Pigments

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Seven C-methylcalix[4]resorcinarene (CRA)-based photorefractive (PR) hyper-structured molecular glasses (HSMGs) containing carbazole-based methine nonlinear optical (NLO) chromophores were designed and synthesized via esterification between carboxyl-containing asymmetric CRA core molecule and hydroxyl-containing functional compounds. When the feed ratio of hydroxyl-containing NLO functional compounds to carboxyl groups of CRA-COOH was kept at 1.5/1 by mole, the degree of introduction of NLO chromophore to the CRA core was above 70%. All the HSMGs show low glass transition temperatures (Tg), and good solubility in common low boiling point solvents such as THF, CHCl3, etc. Powder XRD and UV-vis absorption in films of HSMGs indicate that the aggregation, packing and crystallization of the NLO chromophores in these HSMGs had been effectively reduced. Doping with Nethyl-carbazole (ECz) as a plasticizer and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as a photosensitizer, all the HSMGs composites showed good PR effects. All the coupling gain coefficients (Γ) of HSMGs-based composites are about twice to the corresponding small molecular NLO chromophores-based composites, thanks to the decreased NLO chromophores antiparallel packing caused by the asymmetric CRA core. Among them, CRA-CSN/ECz/PCBM (69:30:1, wt.%) composite exhibited the best performance with the Γ value of 78.2 cm-1 at the external electric field of 12.5 V μm-1 , which is one of the best performance in molecular glasses under the same test conditions. Coupled with their convenient synthesis, this work will provide a new simple design strategy for organic PR materials.

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Section: Synthesis and Characterizationmentioning

confidence: 99%