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Spatial exciton allocation strategy with reduced energy loss for high-efficiency fluorescent/phosphorescent hybrid white organic light-emitting diodes
| Content Provider | United States Department of Energy Office of Scientific and Technical Information (OSTI.GOV) |
|---|---|
| Author | Zhao, Fangchao Wei, Ying Xu, Hui Chen, Dustin Ahamad, Tansir Pei, Qibing Ma, Dongge |
| Organization | Univ. of California, Los Angeles, CA (United States) |
| Abstract | Due to the poor operational lifetime of blue phosphorescent dopants and blue thermally activated delayed fluorescent (TADF) materials, hybrid white organic light-emitting diodes (WOLEDs) with conventional blue fluorescent emitters are still preferred for commercial applications in general lighting. However, the improvement in the overall efficiency of hybrid WOLEDs has been limited due to energy losses during the energy transfer process and exciton quenching after the spatial separation of the singlet and triplet excitons. Here we demonstrate the development of a Spatial Exciton Allocation Strategy (SEAS) to achieve close to 100% internal quantum efficiency (IQE) in blue-yellow complementary color hybrid WOLEDs. The employed blue fluorophore not only has a resonant triplet level with the yellow phosphor to reduce energy loss during energy transfer processes and triplet–triplet annihilation (TTA), but also has a resonant singlet level with the electron transport layer to extend singlet exciton distribution and enhance both singlet and triplet exciton utilization. Thus, the resulting hybrid WOLEDs exhibited 104 lm W-1 efficacy at 100 cd m-2 and 74 lm W-1 at 1000 cd m-2 with CIE coordinates of (0.42, 0.44) which is warm white and suitable for indoor lighting. |
| Sponsorship | USDOE Office of Energy Efficiency and Renewable Energy (EERE) |
| Related Links | https://www.osti.gov/biblio/1429117 |
| Starting Page | 641 |
| Ending Page | 648 |
| Page Count | 8 |
| File Format | |
| ISSN | 20516347 |
| DOI | 10.1039/c7mh00131b |
| Journal | Materials Horizons |
| Volume Number | 4 |
| Issue Number | 4 |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Publisher Date | 2017-05-17 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | ENGINEERING MATERIALS SCIENCE INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY Lighting, OLED |
| Content Type | Text |
| Resource Type | Article |
| Subject | Mechanics of Materials Materials Science Electrical and Electronic Engineering Process Chemistry and Technology |
