Special Section on Organic Light-Emitting Materials and Devices

Optimization of the efficacy and angle dependence of emission of top-emissive organic light-emitting diodes on metal foils

[+] Author Affiliations
Harmen Rooms

The Holst Centre / TNO, P.O. Box 8550, 5605 KN Eindhoven, The Netherlands

Dorothee Hermes

The Holst Centre / TNO, P.O. Box 8550, 5605 KN Eindhoven, The Netherlands

Stephan Harkema

The Holst Centre / TNO, P.O. Box 8550, 5605 KN Eindhoven, The Netherlands

Cristina Tanase

Philips Research, High Tech Campus 4-1.114, 5656 AE Eindhoven, The Netherlands

Ton van Mol

The Holst Centre / TNO, P.O. Box 8550, 5605 KN Eindhoven, The Netherlands

Paul W. M. Blom

The Holst Centre / TNO, P.O. Box 8550, 5605 KN Eindhoven, The Netherlands

Joanne Wilson

The Holst Centre / TNO, P.O. Box 8550, 5605 KN Eindhoven, The Netherlands

J. Photon. Energy. 1(1), 011024 (May 26, 2011). doi:10.1117/1.3590937
History: Received August 05, 2010; Revised April 22, 2011; Accepted April 26, 2011; Published May 26, 2011; Online May 26, 2011
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We have investigated how to optimize the efficacy and angle dependence of emission of top-emissive organic light-emitting diodes (OLEDs) based on metal foil substrates with the aim of creating efficient flexible devices for lighting and signage applications. By systematically varying the device architecture we were able to tune the optical microcavity which exists within the device structure and observe the change in performance. We paid particular attention to the effects of the metal foil roughness. We have seen that by changing the layer thickness of the poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) [PEDOT:PSS] in the device, and the substrate reflectivity and roughness we can obtain efficacies not too far from those achieved for standard bottom-emissive devices on glass substrates made with the same emitter. The angle dependence of luminance can be tuned from pointing in the forward direction via Lambertian to having a maximum at around 65°, and we have used optical modeling to help us find the optimum device structure. We conclude that (rough) metal foils are a realistic possibility for making flexible OLEDs and have demonstrated large area (up to 12 cm × 12 cm), thin film encapsulated, flexible devices.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

Harmen Rooms ; Dorothee Hermes ; Stephan Harkema ; Cristina Tanase ; Ton van Mol, et al.
"Optimization of the efficacy and angle dependence of emission of top-emissive organic light-emitting diodes on metal foils", J. Photon. Energy. 1(1), 011024 (May 26, 2011). ; http://dx.doi.org/10.1117/1.3590937


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