An efficient pyridine- and oxadiazole-containing hole-blocking material far organic light-emitting diodes: Synthesis, crystal structure, and device performance

Wang, C.S.; Jung, G.Y.; Hua, Y.L.; Pearson, C.; Bryce, M.R.; Petty, M.C.; Batsanov, A.S.; Goeta, A.E.; Howard, J.A.K.

Abstract

In this paper, we focus on the synthesis and structure of the new bis(1,3,4-oxadiazole) system 2,5-bis[2-(4-tert- butylphenyl)-1,3,4-oxadiazol-5-yl]pyridine (PDPyDP). We have fabricated light-emitting diodes (LEDs) using poly[2-methoxy-5- (2-ethylhexoxy)-1,4-phenylene vinylene] (MEH-PPV) as the emissive material, with and without a thermally evaporated electron-injection/hole-blocking layer of either PDPyDP or its vinylene analogue (E)-1,2-bis[2-(4-tert-butylphenyl)-1,3,4- oxadiazol-5-yl]ethene (PDVDP) or its phenylene analogue 1,4- bis[2-(4-tert-butylphenyl)-1,3,4-oxadiazol-5-yl]benzene (PDPDP). PDPDP is the para isomer of OXD-7, which is a widely used molecular electron-transporting material. Electroluminescence spectra indicate that light is emitted only from the MEH-PPV layer. Using aluminum as the cathode, the bilayer LED with PDPyDP is considerably more efficient than the corresponding single-layer device or devices with PDVDP or PDPDP as the electron-injection layer.

Citation

Wang, C., Jung, G., Hua, Y., Pearson, C., Bryce, M., Petty, M., …Howard, J. (2001). An efficient pyridine- and oxadiazole-containing hole-blocking material far organic light-emitting diodes: Synthesis, crystal structure, and device performance. Chemistry of Materials, 13(4), 1167-1173

• Journal Article Type: Article
• Publication Date: 2001-04
• Journal: Chemistry of Materials
• Print ISSN: 0897-4756
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 13
• Issue: 4
• Pages: 1167-1173
• Public URL: https://durham-repository.worktribe.com/output/1555304
• Publisher URL: <Go to ISI>://000168245800004