Alternating 2,7- and 3,6-linked carbazole copolymers as wide band gap energy transfer donors

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• 作者：David F. Pickup ; Hunan Yi ; Harismah Kun ; Ahmed Iraqi ; Mathew Stevenson ; David G. Lidzey
• 关键词：Organic semiconductors ; Carbazole polymers ; Light emitting diodes ; Conjugated polymers
• 刊名：Thin Solid Films
• 出版年：2009
• 出版时间：2 March 2009
• 年：2009
• 卷：517
• 期：9
• 页码：2840-2844
• 全文大小：376 K

文摘

An alternating copolymer comprising 3,6-linked-9-(2-ethylhexyl)-9H-carbazole and 2,7-linked-3,6-dimethyl-9-(2-hexyldecy)-9H-carbazole has been prepared using Suzuki cross-coupling conditions. The polymer was characterised by nuclear magnetic resonance spectroscopy, UV–Vis absorption spectroscopy, fluorescence spectroscopy and its weight-average molecular weight was estimated using gel permeation chromatography. The polymer is thermally stable up to 420 °C and displays a wide band gap (3.2 eV) and a narrow emission band at 400 nm with a full width at half maximum of 56 nm. Electroluminescence studies indicated that the polymer emitted principally blue light when blended with 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole and was found to be a good energy transfer donor to bis(2-(2′-benzothienyl)-pyridinato-N,C³′)iridium (acetylacetonate) and provided devices with an efficiency of 0.1 cd/A, and a turn-on voltage of 5.6 V.