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To improve the power efficiency of light emitting diodes (OLEDs), wedeveloped a novel OLED structure, termed Dielectric-Nanomesh OLED (DNM-OLED),fabricated by large-area nanoimprint lithography (NIL). A dielectric-nanomeshsubstrate with a subwavelength nanomesh grating patterned into glass releasesthe photons trapped in ITO and organic layers by guided modes into leaky modes.And the dielectric-nanomesh substrate modifies the entire OLED layers into acorrugated configuration, which further lowers the parasitic resistance andhence the operating voltage. For a red phosphorescent OLED in ourdemonstration, with the DNM-OLED structure, the light extraction efficiency wasenhanced by 1.33 fold and the operating voltage was lowered by 46%, actingtogether, leading to a 1.8-fold enhancement in power efficiency. Besides redOELDs, the DNM-OLED structure was also shown to be able to work for green andblue OELDs and achieved enhanced light extraction efficiency (1.31 fold forgreen light, 1.45 fold for blue light) without further structure modification,which demonstrated the light extraction enhancement by the DNM-OLED isbroadband.

Significant Light Extraction and Power Efficiency Enhancement of Organic  Light Emitting Diodes by Subwavelength Dielectric-Nanomesh Using Large-area  Nanoimprint