DOI: 10.1143/jjap.37.1457. Organic Light Emitting Diodes with Reduced Spectral and Spacial Halfwidths

Organic Light Emitting Diodes with Reduced Spectral and Spacial Halfwidths

10.1143/jjap.37.1457

Crossref journal-article

IOP Publishing

Japanese Journal of Applied Physics (266)

Abstract

Organic light emitting diodes (OLEDs) with reduced spectral and spacial halfwidths for full-color imaging applications are investigated. The electroluminescence behaviour of the lanthanide complexes Eu(TTFA)3Phen and Tb(ACAC)3Phen having sharp emission lines in the red and green spectrum, respectively, is examined for different OLED structures. Device optimization criteria with respect to multilayer design and material choice for this type of device are given. A Fabry-Pérot microcavity OLED is investigated to narrow the spectral width of commonly used organic materials (e.g. Alq3) from 100 nm to only 13 nm, demonstrating blue and green emission. In addition, the forward emission at the resonance wavelength is 8 times higher in intensity accompanied by a reduced spacial halfwidth. The directivity is further improved using materials with inherent narrow spectral widths. A spacial full-width at half maximum (FWHM) of 12° is demonstrated if the europium complex Eu(TTFA)3Phen is embedded into a microcavity structure. Compared to a non-cavity device as a reference, the emission intensity in this direction is significantly enhanced by a factor of about 8.

Bibliography

Siegfried Dirr, S. D., Achim BÃ¶hler, A. B., Stefan Wiese, S. W., Hans-Hermann Johannes, H.-H. J., & Wolfgang Kowalsky, W. K. (1998). Organic Light Emitting Diodes with Reduced Spectral and Spacial Halfwidths. Japanese Journal of Applied Physics, 37(3S), 1457.

Authors 5

Siegfried Dirr Siegfried Dirr (first)
Achim Böhler Achim Böhler (additional)
Stefan Wiese Stefan Wiese (additional)
Hans-Hermann Johannes Hans-Hermann Johannes (additional)
Wolfgang Kowalsky Wolfgang Kowalsky (additional)

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Dates

Type	When
Created	22 years, 11 months ago (Oct. 1, 2002, 6:45 p.m.)
Deposited	2 years, 8 months ago (Dec. 14, 2022, noon)
Indexed	6 months, 2 weeks ago (Feb. 21, 2025, 5:33 a.m.)
Issued	27 years, 6 months ago (March 1, 1998)
Published	27 years, 6 months ago (March 1, 1998)
Published Print	27 years, 6 months ago (March 1, 1998)

Funders 0

None

BibTeX

@article{Siegfried_Dirr_1998, title={Organic Light Emitting Diodes with Reduced Spectral and Spacial Halfwidths}, volume={37}, ISSN={1347-4065}, url={http://dx.doi.org/10.1143/jjap.37.1457}, DOI={10.1143/jjap.37.1457}, number={3S}, journal={Japanese Journal of Applied Physics}, publisher={IOP Publishing}, author={Siegfried Dirr, Siegfried Dirr and Achim Böhler, Achim Böhler and Stefan Wiese, Stefan Wiese and Hans-Hermann Johannes, Hans-Hermann Johannes and Wolfgang Kowalsky, Wolfgang Kowalsky}, year={1998}, month=mar, pages={1457} }

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  "abstract": "<jats:p> \n     Organic light emitting diodes (OLEDs)    with reduced spectral and spacial halfwidths for full-color imaging   applications    are investigated. The electroluminescence behaviour   of the lanthanide complexes    Eu(TTFA)<jats:sub>3</jats:sub>Phen and Tb(ACAC)<jats:sub>3</jats:sub>Phen having    sharp emission   lines in the red and green spectrum, respectively,    is examined   for different OLED structures.   Device optimization criteria with   respect to multilayer design and    material choice for this type of   device are given. A Fabry-P\u00e9rot microcavity OLED is investigated    to narrow the spectral width of commonly used organic    materials (<jats:italic>e.g.</jats:italic> Alq<jats:sub>3</jats:sub>) from 100 nm to only 13 nm, demonstrating    blue and green emission. In addition, the    forward emission    at the resonance wavelength is 8 times higher in    intensity accompanied by a reduced spacial halfwidth.    The directivity is further improved using materials with    inherent narrow spectral widths. A spacial    full-width at half maximum (FWHM) of 12\u00b0   is demonstrated if the europium complex Eu(TTFA)<jats:sub>3</jats:sub>Phen    is embedded into a microcavity structure. Compared   to a non-cavity device as a reference, the emission intensity in    this direction is significantly enhanced by a factor of about\u00a08.    \n    </jats:p>",
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