Viewing-angle independence of white emission from microcavity top-emitting organic light-emitting devices with periodically and gradually changed cavity length

• Viewing-angle independent WTOLEDs have been fabricated.
• A microcavity with a periodically and gradually changed cavity length has been constructed.
• The periodic microstructured cavity has been introduced into the WTOLEDs.
• The viewing-angle independence in both the spectrum and CIE coordinates are obtained.
• The microstructured WTOLEDs show comparable efficiency to that of the planar TOLEDs.

We demonstrate a broad-bandwidth and viewing-angle independent white emission from top-emitting organic light-emitting devices (TOLEDs) by integrating a microstructured cavity with a periodically and gradually changed cavity length. The results indicate that the microstructured cavity can resolve the viewing angle-dependence effect persisted in the conventional planar TOLEDs. The viewing-angle independence in both broad-band emission spectra and Commision Internationale de L’Eclairage coordinates are obtained. Moreover, the microstructured white TOLEDs show comparable luminance and current efficiency to that of the planar TOLEDs.

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