Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/10383
Title: Navigating CIE Space for Efficient TADF Downconversion WOLEDs
Authors: Aksoy, Erkan
Danos, Andrew
Varlıklı, Canan
Monkman, Andrew P.
Keywords: TADF
Perylene
White OLED
Downconversion
Issue Date: 2020
Publisher: Elsevier Ltd.
Abstract: High efficiency orange and green emitting perylene dyes have been synthesized and dispersed in an inert polymer host to form an optical downconversion layer. To avoid dye aggregation and allow controlled colour tuning, this layer was deposited in multiple low-concentration spin-coating steps, directly on top of a high performance blue thermally activated delayed fluorescence (TADF) organic light emitting diode (OLED). The orange downconversion layer partially absorbs the blue OLED emission, while emitting a complementary orange to give white light. However, as energy transfer between the TADF and perylene downconverter is based on emission and reabsorption, absorptive filtering of the blue OLED emission band necessitates the inclusion of an additional green-emitting perylene top-layer to achieve optimal white balance. The optimised white OLED fabricated in this way displayed excellent white colour balance (CIE x, y; 0.33, 0.33) with perfect stability, good colour rendering (CRI 80), and a high maximum efficiency (maximum EQE 17.2%) with minimal losses compared to the base blue OLED. This approach is widely applicable for generating white emission from any kind of blue OLED, and is compatible with a wide range of downconverting dyes and host materials.
URI: https://doi.org/10.1016/j.dyepig.2020.108707
https://hdl.handle.net/10383
ISSN: 0143-7208
1873-3743
Appears in Collections:Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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