1613331-41-1Relevant academic research and scientific papers
Design and synthesis of novel anthracene derivatives as n-type emitters for electroluminescent devices: A combined experimental and DFT study
Mallesham,Balaiah,Reddy, M. Ananth,Sridhar,Singh, Punita,Srivastava, Ritu,Bhanuprakash,Rao, V. Jayathirtha
, p. 342 - 357 (2014/02/14)
Six novel anthracene-oxadiazole derivatives, 4a (2-(4-(anthracen-9-yl) phenyl)-5-p-tolyl-1,3,4-oxadiazole), 4b (2-(4-(anthracen-9-yl)phenyl)-5-(4-tert- butylphenyl)-1,3,4-oxadiazole), 4c (2-(4-(anthracen-9-yl)phenyl)-5-(4- methoxyphenyl)-1,3,4-oxadiazole), 8a (2-(4-(anthracen-9-yl)phenyl)-5-m-tolyl-1, 3,4-oxadiazole), 8b (2-(3-(anthracen-9-yl)phenyl)-5-(4-tert-butylphenyl)-1,3,4- oxadiazole) and 8c (2-(3-(anthracen-9-yl)phenyl)-5-(3,4,5-trimethoxyphenyl)-1,3, 4-oxadiazole) have been synthesized and characterized for use as emitters in organic light emitting devices (OLEDs). They show good thermal stability (T d, 297-364 °C) and glass transition temperatures (Tg) in the range of 82-98 °C, as seen from the thermo gravimetric analysis and differential scanning calorimetric studies. The solvatochromism phenomenon and electrochemical properties have been studied in detail using UV-Vis absorption, fluorescence spectroscopy and cyclic voltammetry. TD-DFT calculations have been carried out to understand the electrochemical and photophysical properties. The spatial structures of 4b and 8c are further confirmed by X-ray diffraction analysis. Un-optimized non-doped electroluminescent devices were fabricated using these anthracene derivatives as emitters with the following device configuration: ITO (120 nm)/α-NPD (30 nm)/4a-4c or 8a-8c (35 nm)/BCP (6 nm)/Alq3 (28 nm)/LiF (1 nm)/Al (150 nm). Among all the six compounds, 8a displays the maximum brightness of 1728 cd m-2 and current efficiency 0.89 cd A-1. Furthermore, as an electron transporter, 8a exhibited superior performance (current efficiency is 11.7 cd A-1) than the device using standard Alq3 (current efficiency is 8.69 cd A-1), demonstrating its high potential for employment in OLEDs. These results indicate that the new anthracene-oxadiazole derivatives could play an important role in the development of OLEDs. The Royal Society of Chemistry and Owner Societies.
