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Proceedings Paper

White light emission from an exciplex interface with a single emitting layer (Conference Presentation)
Author(s): Wilson Bernal; Enrique Perez-Gutierrez; Andres Agular; J. Oracio C. Barbosa G; Jose L. Maldonado; Marco Antonio Meneses-Nava; Mario A. Rodriguez Rivera; Braulio Rodriguez

Paper Abstract

Efficient solid state lighting devices based in inorganic emissive materials are now available in the market meanwhile for organic emissive materials still a lot of research work is in its way. [1,2] In this work a new organic emissive material based on carbazole, N-(4-Ethynylphenyl) carba-zole-d4 (6-d4), is used as electron-acceptor and commercial PEDOT:PSS as the electron-donor to obtain white emission. Besides the HOMO-LUMO levels of materials the white emission showed dependence on the films thicknesses and applied voltages. In here it is reported that by diminishing the thickness of the PEDOT:PSS layer, from 60 to 35 nm, and by keeping the derivative carbazole layer constant at 100 nm the electro-luminescence (EL) changed from emissive exciton states to the mixture of emissive exciton and exciplex states. [3] For the former thicknesses no white light was obtained meanwhile for the later the EL spectra broadened due to the emission of exciplex states. Under this condition, the best-achieved CIE coordinate was (0.31,0.33) with a driving voltage of 8 V. To lower the driving voltage of the devices a thin film of LiF was added between the derivative of carbazol and cathode but the CIE coordinates changed. The best CIE coordinates for this case were (0.29, 0.34) and (0.32, 0.37) with driving voltage of about 6.5 V. Acknowledgments: CeMie-Sol/27 (Mexico) 207450 References [1] Timothy L Dawson, Society of Dyers and Colourists, Color. Technol., 126, 1–10 (2010), doi: 10.1111/j.1478-4408.2010.00220.x [2] G. M. Farinola, R. Ragni, Journal of Solid State Lighting, 2:9 (2015), doi: 10.1186/s40539-015-0028-7. [3] E. Angioni, et al, J. Mater. Chem. C, 2016, 4, 3851, doi: 10.1039/c6tc00750c.

Paper Details

Date Published: 19 April 2017
PDF: 1 pages
Proc. SPIE 10101, Organic Photonic Materials and Devices XIX, 101010B (19 April 2017); doi: 10.1117/12.2250570
Show Author Affiliations
Wilson Bernal, Centro de Investigaciones en Óptica, A.C. (Mexico)
Enrique Perez-Gutierrez, Centro de Investigaciones en Óptica, A.C. (Mexico)
Andres Agular, Instituto de Quimica (Mexico)
J. Oracio C. Barbosa G, Centro de Investigaciones en Óptica, A.C. (Mexico)
Jose L. Maldonado, Centro de Investigaciones en Óptica, A.C. (Mexico)
Marco Antonio Meneses-Nava, Centro de Investigaciones en Óptica, A.C. (Mexico)
Mario A. Rodriguez Rivera, Centro de Investigaciones en Óptica, A.C. (Mexico)
Braulio Rodriguez, Instituto de Quimica (Mexico)

Published in SPIE Proceedings Vol. 10101:
Organic Photonic Materials and Devices XIX
Christopher E. Tabor; François Kajzar; Toshikuni Kaino; Yasuhiro Koike, Editor(s)

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