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Deep-blue emissive and colourless polyimides: optical property tuning by triphenylamino and carbazole chromophores
Year: 2024
Type of publication: článek v odborném periodiku
Name of source: Materials advances
Publisher name: ROYAL SOC CHEMISTRY
Place: CAMBRIDGE
Page from-to: 3198–3206
Titles:
Language Name Abstract Keywords
cze Modře emisivní a bezbarvé polyimidy: ladění optických vlastností pomocí trifenylaminových a karbazolových chromoforů Byly navrženy, připraveny a dále využity dva nové emisivní chromofory na bázi trifenylaminu a karbazolu jako komonomery pro emisivním bezbarvé polyimidy. Vztahy mezi strukturou a vlastnostmi byly popsány jak v roztoku, tak v řetězci polymeru. Snadná planarizace/rigidifikace centrálního donoru chromoforu se ukázala jako užitečná strategie pro ladění optických a tepelných vlastností jak jedné molekuly, tak polymerního filmu. Připravené filmy jsou vysoce tepelně stabilní a vysoce transparentní a většina filmů byla bezbarvá. Barva luminiscence filmů se pohybuje od žlutozelené po modrou. fluorescence; chromofory; trifenylamin; karbazol; polyimid
eng Deep-blue emissive and colourless polyimides: optical property tuning by triphenylamino and carbazole chromophores Two novel emissive chromophores based on triphenylamine and carbazole have been designed, prepared and further utilized as comonomers towards end-capped emissive colourless polyimides. The polyimide films were fabricated using 1,2,4,5-cyclohexanetetracarboxylicdianhydride/2,2-bis[4-(4-aminophenoxy)phenyl]propane (CHDA-BAPP) and 4,4 '-(hexafluoroisopropylidene)diphthalic anhydride/2,2'-bis(trifluoromethyl)benzidine (6FDA-TFMB), and 5, 1 or 0.1 mol% of comonomer. Fundamental structure-property relationships were elucidated both in solution and the polymeric backbone. Facile planarization/rigidification of the chromophore central donor turned out to be a useful strategy to modulate the optical and thermal properties both of the single molecule and polymeric film. The prepared films are highly thermally stable (T5% up to 526 degrees C) and highly transparent (T400 ranging between 72-86% for 0.1 mol% loadings), and most of the films were colourless. The luminescence colour of the films ranges from yellow-greenish to blue. CHDA-BAPP carbazole-terminated PIs showed deep-blue emission and excellent optical properties with CIEy <= 0.1 and high colour purity (FWHM 38 resp. 42 nm) doped with 1 resp. 0.1 mol% of comonomer. The experimental data were further corroborated by DFT calculations and single crystal X-ray analysis. Two novel emissive chromophores based on triphenylamine and carbazole have been designed, prepared and further utilized as comonomers towards end-capped emissive colourless polyimides. efficient; fluorescence; derivatives; dynamics; state

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