Easy accessible blue luminescent carbazole-based materials for organic light-emitting diodes. (February 2017)

• Record Type: Journal Article
• Authors: Reig, Marta; Gozálvez, Cristian; Bujaldón, Roger; Bagdziunas, Gintautas; Ivaniuk, Khrystyna; Kostiv, Nataliya; Volyniuk, Dmytro; Grazulevicius, Juozas V.; Velasco, Dolores
• Is Part Of: Dyes and pigments. Volume 137(2017)
• Page Start: 24
• Page End: 35
• Publication Date: 2017-02
• Subjects: Carbazole -- Luminescence -- Organic semiconductor -- Amorphous materials -- OLEDs -- DFT calculations; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2016.09.062
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: The thermal, optical, electrochemical and charge transport properties of a series of nine straightforward carbazole-based compounds have been analysed and interpreted according to their molecular structure by means of the X-ray analysis of single crystals. A non-doped OLED device with low turn-on voltage and maximum luminance up to 1.4 × 10 4 cd m −2 was achieved. DFT calculations have been performed to explain the high efficiency of radiative exciton production. Graphical abstract: A series of aryl substituted carbazoles with hole transport properties have been evaluated as blue emitters for organic light-emitting diodes (OLEDs). A simple structured blue OLED exhibits very low turn-on voltage of 4 V, high luminance up to 1.4 × 10 4 cd m −2 and maximum current efficiency of 3.3 cd A −1 . A high efficiency of radiative exciton production ( ϕ ) of 45% has been calculated. Highlights: Structure-properties relationship of a series of carbazole derivatives is analysed. A simple structured blue OLED device exhibits high competitive performance. An emission mechanism for the OLED device is proposed through DFT calculations.