White light emission from an exciplex interface with a single emitting layer (Conference Presentation)

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

doi:10.1117/12.2250570

19 April 2017 White light emission from an exciplex interface with a single emitting layer (Conference Presentation)

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

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Proceedings Volume 10101, Organic Photonic Materials and Devices XIX; 101010B (2017) https://doi.org/10.1117/12.2250570
Event: SPIE OPTO, 2017, San Francisco, California, United States

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.

Conference Presentation

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Wilson Bernal, Enrique Perez-Gutierrez, Andres Agular, J. Oracio C. Barbosa G, Jose L. Maldonado, Marco Antonio Meneses-Nava, Mario A. Rodriguez Rivera, and Braulio Rodriguez "White light emission from an exciplex interface with a single emitting layer (Conference Presentation)", Proc. SPIE 10101, Organic Photonic Materials and Devices XIX, 101010B (19 April 2017); https://doi.org/10.1117/12.2250570

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KEYWORDS

Electroluminescence

Excitons

Interfaces

Thin film devices

Solid state lighting

Laser induced fluorescence

Thin films

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