Organic light emitting diodes with reduced spectral and spacial halfwidths

被引：26

作者：

Dirr, S ^{[1
]}

Bohler, A ^{[1
]}

Wiese, S ^{[1
]}

Johannes, HH ^{[1
]}

Kowalsky, W ^{[1
]}

机构：

[1] Tech Univ Braunschweig, Inst Hochfrequenztech, D-38092 Braunschweig, Germany

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 1998年 / 37卷 / 3B期

关键词：

electroluminescence; organic light emitting diode; OLED; lanthanide complex; microcavity; flat panel display; organic molecular beam deposition;

D O I：

10.1143/JJAP.37.1457

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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)(3)Phen 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-Perot microcavity OLED is investigated to narrow the spectral width of commonly used organic materials (e.g. Alq(3)) 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 degrees is demonstrated if the europium complex Eu(TTFA)(3)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 8.

引用

页码：1457 / 1461

页数：5

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