Blue emitting OLED with oxadiazole/carbazole containing active layer

H. C. Neitzert; M. Ferrara; S. Bellone; A. Rubino; S. Concilio; P. Iannelli; P. Vacca; L. Ferrara

doi:10.1117/12.608989

7 July 2005 Blue emitting OLED with oxadiazole/carbazole containing active layer

H. C. Neitzert, M. Ferrara, S. Bellone, A. Rubino, S. Concilio, P. Iannelli, P. Vacca, L. Ferrara

Proceedings Volume 5840, Photonic Materials, Devices, and Applications; (2005) https://doi.org/10.1117/12.608989
Event: Microtechnologies for the New Millennium 2005, 2005, Sevilla, Spain

Abstract

The optoelectronic properties of a new type of organic light-emitting diode have been measured, which incorporates in the active layer a molecule containing as well an electron conducting and blue emitting oxadiazole group and a hole conducting carbazole group. The investigated device consists of this active oxadiazole/carbazole layer deposited by spin-coating on transparent conductive oxide (TCO) covered glass substrate and top aluminium contacts for electron injection. We compared two types of devices, with and without the insertion of a 40nm thick spin-coated PEDOT layer as hole injector between the active and the TCO layer. Stable blue emission has been observed only for the device with inserted PEDOT layer with an inset of the light emission at an applied voltage of 10V. For devices without PEDOT layer a much higher threshold voltage for light emission and a lower quantum efficiency as compared to the device with intermediate PEDOT layer has been found.

Citation Download Citation

H. C. Neitzert, M. Ferrara, S. Bellone, A. Rubino, S. Concilio, P. Iannelli, P. Vacca, and L. Ferrara "Blue emitting OLED with oxadiazole/carbazole containing active layer", Proc. SPIE 5840, Photonic Materials, Devices, and Applications, (7 July 2005); https://doi.org/10.1117/12.608989

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