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Enhanced light extraction efficiency from organic light emitting diodes by insertion of a two-dimensional photonic crystal structure
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10.1063/1.1815049
/content/aip/journal/jap/96/12/10.1063/1.1815049
http://aip.metastore.ingenta.com/content/aip/journal/jap/96/12/10.1063/1.1815049

Figures

Image of FIG. 1.
FIG. 1.

Schematic diagram of a conventional OLED device and of the light paths of the three modes of emitted light: external mode, glass guided modes, and high-index guided modes.

Image of FIG. 2.
FIG. 2.

Three-dimensional FDTD calculation structure and parameter definitions for the square-lattice 2D PC OLED. Left diagram, side view; right diagram, top view.

Image of FIG. 3.
FIG. 3.

The results of the numerical model for the time dependence of the light-propagation path in (a) the conventional OLED and (b) the 2D PC OLED .

Image of FIG. 4.
FIG. 4.

(a) FE-SEM micrographs of the tilted cross-sectional view of the 2D low-index material nanopattern . (b) FIB-SEM image of a PC OLED device on a 2D PC layer .

Image of FIG. 5.
FIG. 5.

(a) Current density-brightness and current density-efficiency characteristics and (b) Current-voltage curves of OLEDs with and without a 2D PC layer at the interface between the glass layer and the ITO electrode.

Image of FIG. 6.
FIG. 6.

Emission spectra of OLEDs with and without a 2D PC layer at the interface between the glass layer and the ITO electrode.

Image of FIG. 7.
FIG. 7.

Angular dependence of the emission spectra of (a) the conventional OLED and (b) the 2D PC OLED .

Image of FIG. 8.
FIG. 8.

Angular dependence of Commission Internationale de’Eclairage (CIE) color coordinates of OLEDs with and without a 2D PC layer .

Image of FIG. 9.
FIG. 9.

(a–c) Measured 2D far-field intensity profiles of (a) a conventional OLED, (b) a PC OLED , and (c) a PC OLED . (d–f) Intensity profiles along the horizontal line (A–B) of the 2D far-field intensity profiles for (d) a conventional OLED, (e) a PC OLED , and (f) a PC OLED .

Image of FIG. 10.
FIG. 10.

Normalized EL intensity at as a function of aging time of the conventional OLED (dotted line), and of the OLED containing a 2D PC layer (solid line).

Tables

Generic image for table
Table I.

Measured relative extraction efficiency of a conventional OLED and two PC OLEDs ( and ).

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/content/aip/journal/jap/96/12/10.1063/1.1815049
2004-12-02
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Enhanced light extraction efficiency from organic light emitting diodes by insertion of a two-dimensional photonic crystal structure
http://aip.metastore.ingenta.com/content/aip/journal/jap/96/12/10.1063/1.1815049
10.1063/1.1815049
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