Tailoring directive gain for high-contrast, wide-viewing-angle organic light-emitting diodes using speckle image holograpy metasurfaces

Lei Zhou, Qing-Dong Ou, Su Shen, Yun Zhou, Yuan-Yuan Fan, Jun Zhang, Jian-Xin Tang

Research output: Contribution to journalArticleResearchpeer-review

9 Citations (Scopus)

Abstract

Holography metasurfaces have been used to control the propagation of light to an unprecedented level, exhibiting the immense potential for light steering in organic light-emitting diodes (OLEDs). Here, a new approach to tailoring directive gain for high contrast, wide-viewing-angle OLEDs is proposed by implementing a spcekle image holography (SIH) metasurface. The experimental and theoretical results provide the direct proofs that the SIH metasurface can play very important roles not only in releasing the trapped energy flow insides the devices but also in tailoring the wavefronts to the preferred patterns due to its "regional orientation" k-vectors patterns. The resulting power efficiency and external quantum efficiency of the OLEDs using a SIH metasurface are 1.97 and 1.95 times that of the reference device with a standard architecture. Furthermore, the wavefronts of emitted light are delicately modulated in a polarization-independent manner, yielding 2.5 times higher contrast ratio compared to the reference device. This unique engineered directive gain property is also well-retained for the viewing angles varing from normal to titled ±60° without spectral distortion. These results enrich the understanding of light wavefronts control in OLEDs and highlight its potential application in display as well as light steering for other optoelectronics.

Original languageEnglish
Pages (from-to)22402-22409
Number of pages8
JournalACS Applied Materials & Interfaces
Volume8
Issue number34
DOIs
Publication statusPublished - 31 Aug 2016

Keywords

  • directive gain
  • holography metasurface
  • organic light-emitting diodes
  • speckle image holography

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