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Surface-plasmon-enhanced microcavity organic light-emitting diodes

Hongmei Zhang, Shufen Chen, and Dewei Zhao

Open Access Open Access

Abstract

Efficiency enhancement of organic light-emitting diodes (OLEDs) can be obtained by the combination of microcavity effect and Au nanoparticles based surface plasmons. Au nanoparticles are thermally deposited on distributed Bragg reflector (DBR)-coated glass substrate, leading to realization of microcavity effect and localized surface plasmon effect. Our results show the current efficiency of OLEDs with DBR/Au nanoparticles as anode is increased by 72% compared to that with ITO as anode.

© 2014 Optical Society of America

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Figures (5)
Fig. 1
Fig. 1 (a) Experimental and calculated transmittance spectra of DBR only, DBR/ITO, Au NPs only, and DBR/Au NPs. (b) Absorbance of ITO and Au NPs on ITO. The inset shows the normalized EL spectrum of Alq3 emission.

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Fig. 2
Fig. 2 AFM images of (a) glass substrate and (b) DBR substrate covered with Au nanoparticles layer.

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Fig. 3
Fig. 3 Schematic of (a) microcavity device structure of devices A and B, (b) devices C and D.

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Fig. 4
Fig. 4 (a) J-V and L-V, and (b) Current efficiency – current density of OLEDs with DBR/Au (device A), DBR/ITO (device B), Au (device C), and ITO (device D) as the anode.

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Fig. 5
Fig. 5 Normalized EL spectra of (a) device A (DBR/Au) and (b) device B (DBR/ITO) at different viewing angles.

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Equations (1)

Equations on this page are rendered with MathJax. Learn more.

G e = T 2 [ 1 + R 1 + 2 R 1 cos ( 4 π L 1 λ ) ] ( 1 − R 1 R 2 ) cos ( 4 π L λ ) τ c a v τ
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