Significant color space blue-shift of green OLED emitter with sustaining lifetime and substantial efficiency enhancement

Jung Yu Li, Shih Pu Chen, Huei Jhen Siao, Jin Han Wu, Guan Yu Chen, Cheng Chang Chen, Shu Yi Ho, Yi Ping Lin, Hong Hui Hsu, Jin Sheng Lin, Ming Shan Jeng, Nai Chuan Chen, Hui Kai Zeng, Jenh-Yih Juang

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Abstract

In this study, we demonstrate that by embedding a plasmonic coupling metal layer beneath the active layer of an organic light-emitting diode, the resultant device is capable of inducing significant blue shifts in CIE color space coordinates of emitting light from the green emitting material without compromising the lifetime of the parent material. The implemented device consists of multilayers of organic emitting materials sandwiched by two thin metal layers to form a metal-dielectric-metal (MDM) cavity-like structure. The original green emission with CIE coordinates of (0.22, 0.56) was significantly color space blue-shifted to CIE coordinates of (0.10, 0.53). The MDM device exhibits an efficiency of 62 cd/A at a luminance of 1000 cd/m 2 , which represents a two-fold enhancement of current efficiency. Moreover, the spectral peak intensity is 4.3 times higher than that in a conventional device, which is much higher than that expected for an optical microcavity model, suggesting that the Purcell effect resulting from the coupling of surface plasmon waves may contribute to the extra enhancement of emission intensity.

Original languageEnglish
Article number093301
JournalApplied Physics Letters
Volume111
Issue number9
DOIs
StatePublished - 28 Aug 2017

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