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High efficiency (~100 lm/W) hybrid WOLEDs by simply introducing ultrathin non-doped phosphorescent emitters in blue exciplex host

Abstract

Hybrid white organic light-emitting diodes (WOLEDs) have attracted more attention due to combining the advantages of long lifetime of blue fluorophor and high efficiency of red-green or orange phosphors. However, this often requires complex device structures, and its efficiency is far from meeting the requirements. Here, a simple but efficacious structure was demonstrated to achieve extremely high efficiency hybrid WOLEDs, whose crucial feature is the exploitation of an exciplex as the blue emitter combined with an orange phosphorescent ultrathin layer (UTL). The resulting WOLEDs exhibit a lower turn-on voltage of 2.35 V due to the smart energy level alignment and the carrier injection with no barrier. The maximum forward viewing external quantum efficiency and power efficiency reach 22.45% and 97.1 lm W-1, respectively, and as high as 20.10% and 69.0 lm W-1 at 100 cd m−2, and 39.8 lm W-1 and 16.05% at 1000 cd m-2. Importantly, the location of UTL in blue emitting layer has negligible effect on the driving voltage and efficiency. Such remarkable performance will be better promoting the progress of high efficiency and low-cost hybrid WOLEDs.

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Publication details

The article was received on 13 Apr 2018, accepted on 10 Jun 2018 and first published on 12 Jun 2018


Article type: Paper
DOI: 10.1039/C8TC01736K
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    High efficiency (~100 lm/W) hybrid WOLEDs by simply introducing ultrathin non-doped phosphorescent emitters in blue exciplex host

    S. Ying, J. Yao, Y. Chen and D. Ma, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC01736K

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