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Directional photoluminescence enhancement of organic emitters via surface plasmon coupling
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Figures

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FIG. 1.

(a) PL spectra of sample 1 (, on Au grating) measured at emission angles of −30°, −20°, −10°, 0°, 10°, 20°, and 30° from the normal to the substrate in the plane perpendicular to the sample and the metal grating, (b) PL spectra of sample 1 and planar structure integrated over all emission angles, and (c) 3D contour plot of PL spectra (from 450 to 750 nm) at different viewing angles (from −40° to 40°) of sample 1. Inset of (a): Cross section SEM picture of the device (Au metal grating and emitter) with grating pitch of 500 nm.

Image of FIG. 2.

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FIG. 2.

(a) Experimental and (b) calculated dispersion relation with different grating pitches (metal grating: Au; organic emitter: ). Blue curve with triangles, green curve with circles, and red curve with squares represent sample 2 (500 nm), sample 1 (600 nm), and sample 3 (800 nm), respectively.

Image of FIG. 3.

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FIG. 3.

3D contour plot of PL spectra (from 450 to 750 nm) at different viewing angles (from −40° to 40°) of samples (a) 4, (b) 5, (c) 6, and (d) 7, respectively. Pitches of samples 4, 5, 6, and 7 are all 600 nm, with (metal, organic) materials of (Ag, ), (Au, NPB:DCJTB), (Ag, NPB:DCJTB), and (Au/Ag, ), respectively. Dashed and dotted lines in (d) are guide to the eyes.

Image of FIG. 4.

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FIG. 4.

(a) Experimental and (b) calculated dispersion relation with different metal and organic materials . Purple curve with squares, red curve with circles, blue curve with triangles, and green curve with stars represent sample 4 , sample 6 (Ag/NPB), sample 1 , and sample 5 (Au/NPB), respectively.

Tables

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Table I.

Grating pitch and metal and organic materials of the samples.

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/content/aip/journal/apl/94/10/10.1063/1.3097027
2009-03-11
2014-04-24

Abstract

In this paper, we had quantitatively investigated the photoluminescence of organic emitter on a Si substrate with periodically corrugated metalthin film experimentally and theoretically. Due to the plasmonic coupling by the metalgratings, 4.3 times and 1.7 times enhancements in optical intensities were observed at specified and full viewing angles at certain wavelengths, respectively. Good agreement of angular-frequency versus in-plane wavevector curves between experiments and calculations were obtained when varying organic materials,metalmaterials, and grating pitches. Two different metalmaterials were used, which show slight shift in curves due to the high sensitivity of the surface plasmon to the relative permittivity.

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Scitation: Directional photoluminescence enhancement of organic emitters via surface plasmon coupling
http://aip.metastore.ingenta.com/content/aip/journal/apl/94/10/10.1063/1.3097027
10.1063/1.3097027
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