title: Tailoring Directive Gain for High-Contrast, Wide-Viewing-Angle Organic Light-Emitting Diodes Using Speckle Image Holograpy Metasurfaces.
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.
authors.affiliation: Faculty of Mathematics and Physics, Huaiyin Institute of Technology , Huai'an 223003, PR China.
authors.forename: Lei
authors.initials: L
authors.lastname: Zhou
authors.affiliation: Department of Materials Science and Engineering, Monash University , Clayton, Victoria 3800, Australia.
authors.forename: Qing-Dong
authors.initials: QD
authors.lastname: Ou
authors.affiliation: College of Physics Optoelectronics and Energy, Soochow University , Suzhou 215006, PR China.
authors.forename: Su
authors.initials: S
authors.lastname: Shen
authors.affiliation: College of Physics Optoelectronics and Energy, Soochow University , Suzhou 215006, PR China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: Faculty of Mathematics and Physics, Huaiyin Institute of Technology , Huai'an 223003, PR China.
authors.forename: Yuan-Yuan
authors.initials: YY
authors.lastname: Fan
authors.affiliation: Faculty of Mathematics and Physics, Huaiyin Institute of Technology , Huai'an 223003, PR China.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou 215123, PR China.
authors.forename: Jian-Xin
authors.initials: JX
authors.lastname: Tang
keywords: directive gain; holography metasurface; organic light-emitting diodes; speckle image holography