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High-efficiency and superior color-stability white phosphorescent organic light-emitting diodes based on double mixed-host emission layers |
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| Affiliation: | 1. Department of Chemistry, Fu Jen Catholic University, New Taipei City 24205, Taiwan, ROC;2. Department of Opto-Electronic Engineering, National Dong Hwa University, Hualien 97401, Taiwan, ROC;1. Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, PR China;2. State Key Lab of Transducer Technology, Chinese Academy of Sciences, PR China;3. Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, PR China;1. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, United States;2. Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, United States |
| Abstract: | We demonstrate high-efficiency and superior color-stability white phosphorescent organic light-emitting diodes based on double blue mixed-host emission layers (EMLs) with different mixed ratios. The key feature of the concept is to introduce double blue mixed-host EMLs with an orange ultrathin layer sandwiched between them. The improved white device without spacer or interlayer achieves superior color-stability and reduced efficiency roll-off, which are consistent with the good ambipolar conductivity of the mixed-host layer. Moreover, peak efficiency of 40.8 lm/W and low turn-on voltage of 2.71 V are realized. The double mixed-host EMLs concept proves to be quite useful in achieving excellent device performance. |
| Keywords: | White organic light-emitting diodes Double mixed-host structure Phosphorescent Ultrathin layer Superior color-stability |
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