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High performance hybrid tandem white organic light-emitting diodes by using a novel intermediate connector
Umeå University, Faculty of Science and Technology, Department of Physics.
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2018 (English)In: Journal of Materials Chemistry C, ISSN 2050-7526, E-ISSN 2050-7534, Vol. 6, no 4, p. 767-772Article in journal (Refereed) Published
Abstract [en]

We propose a novel intermediate connector for fluorescence/phosphorescence hybrid tandem white organic light emitting diodes (WOLEDs). The core of our concept is to insert a thin layer of calcium (Ca) between lithium 8-hydroxyquinolinolate (Liq) and 1,4,5,8,9,11-hexaazatriphenylene hexacarbonitrile (HAT-CN) to construct the intermediate connector. The resultant hybrid tandem WOLEDs exhibit very high device performance. For the color-complementary devices, the maximum current efficiency (CE), power efficiency (PE) and external quantum efficiency (EQE) reach 106.3 cd A−1, 51.4 lm W−1 and 39.6%, respectively, without any out-coupling techniques. At the luminance intensity of 1000 cd m−2, the efficiencies can still be maintained at 102.8 cd A−1, 46.9 lm W−1 and 38.8%. We also obtain a color rendering index (CRI) as high as 93 in a three-primary-color device. Moreover, both the complementary and three-primary-color devices possess excellent stability for the luminance increased from 1000 cd m−2 to 10 000 cd m−2.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2018. Vol. 6, no 4, p. 767-772
National Category
Materials Chemistry Physical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-145384DOI: 10.1039/c7tc05082hISI: 000423402500011OAI: oai:DiVA.org:umu-145384DiVA, id: diva2:1188078
Available from: 2018-03-06 Created: 2018-03-06 Last updated: 2018-06-09Bibliographically approved

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Sun, Ning

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