Optical Tunneling to Improve Light Extraction in Quantum Dot and Perovskite Light-Emitting Diodes
An effective strategy based on optical tunneling is developed to significantly improve the efficiency of quantum dots light-emitting diodes (QLEDs) and perovskite light-emitting diodes (PeLEDs). Contrary to the common impression that the hole transport layers (HTL) with low refractive index will sev...
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| Language: | English |
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IEEE
2020-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/9261092/ |
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| author | Guanding Mei Dan Wu Shihao Ding Wallace C. H. Choy Kai Wang Xiao Wei Sun |
| author_facet | Guanding Mei Dan Wu Shihao Ding Wallace C. H. Choy Kai Wang Xiao Wei Sun |
| author_sort | Guanding Mei |
| collection | DOAJ |
| description | An effective strategy based on optical tunneling is developed to significantly improve the efficiency of quantum dots light-emitting diodes (QLEDs) and perovskite light-emitting diodes (PeLEDs). Contrary to the common impression that the hole transport layers (HTL) with low refractive index will severely confine lights according to Snell's law, optical tunneling unlocks a channel to extract the lights through HTL. In this work, we demonstrate the light beyond the critical angle still has a chance to penetrate into the substrate and finally emit outside the device. An optical tunneling model is also presented here to quantitatively describe the light extraction through optical tunneling and reveal related factors. Applying a thin HTL (thickness = 10 nm) and a high-index substrate (refractive index = 2) in the typical device architecture (Glass/ITO/PEDOT:PSS/EML/TPBi/LiF/Al), substrate modes can be improved from 18% to 60%. Therefore, optical tunneling followed by EES is believed to be a cost-effective strategy to enhance light extraction efficiency. This work unravels the potential to further significantly improve the efficiency of QLEDs and PeLEDs. |
| format | Article |
| id | doaj-art-a0068f8a29314fef820bfcfd6cb327a6 |
| institution | DOAJ |
| issn | 1943-0655 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-a0068f8a29314fef820bfcfd6cb327a62025-08-20T03:15:50ZengIEEEIEEE Photonics Journal1943-06552020-01-0112611410.1109/JPHOT.2020.30382759261092Optical Tunneling to Improve Light Extraction in Quantum Dot and Perovskite Light-Emitting DiodesGuanding Mei0Dan Wu1Shihao Ding2Wallace C. H. Choy3Kai Wang4https://orcid.org/0000-0003-0443-6955Xiao Wei Sun5https://orcid.org/0000-0002-2840-1880Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting, Department of Electrical and Electronic Engineering, Guangdong University Key Lab for Advanced Quantum Dot Displays and Lighting, Southern University of Science and Technology, Shenzhen, ChinaShenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting, Department of Electrical and Electronic Engineering, Guangdong University Key Lab for Advanced Quantum Dot Displays and Lighting, Southern University of Science and Technology, Shenzhen, ChinaShenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting, Department of Electrical and Electronic Engineering, Guangdong University Key Lab for Advanced Quantum Dot Displays and Lighting, Southern University of Science and Technology, Shenzhen, ChinaDepartment of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, ChinaShenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting, Department of Electrical and Electronic Engineering, Guangdong University Key Lab for Advanced Quantum Dot Displays and Lighting, Southern University of Science and Technology, Shenzhen, ChinaShenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting, Department of Electrical and Electronic Engineering, Guangdong University Key Lab for Advanced Quantum Dot Displays and Lighting, Southern University of Science and Technology, Shenzhen, ChinaAn effective strategy based on optical tunneling is developed to significantly improve the efficiency of quantum dots light-emitting diodes (QLEDs) and perovskite light-emitting diodes (PeLEDs). Contrary to the common impression that the hole transport layers (HTL) with low refractive index will severely confine lights according to Snell's law, optical tunneling unlocks a channel to extract the lights through HTL. In this work, we demonstrate the light beyond the critical angle still has a chance to penetrate into the substrate and finally emit outside the device. An optical tunneling model is also presented here to quantitatively describe the light extraction through optical tunneling and reveal related factors. Applying a thin HTL (thickness = 10 nm) and a high-index substrate (refractive index = 2) in the typical device architecture (Glass/ITO/PEDOT:PSS/EML/TPBi/LiF/Al), substrate modes can be improved from 18% to 60%. Therefore, optical tunneling followed by EES is believed to be a cost-effective strategy to enhance light extraction efficiency. This work unravels the potential to further significantly improve the efficiency of QLEDs and PeLEDs.https://ieeexplore.ieee.org/document/9261092/Optical tunnelinglight extraction efficiencyquantum dot light-emitting diodesperovskite light-emitting diodes |
| spellingShingle | Guanding Mei Dan Wu Shihao Ding Wallace C. H. Choy Kai Wang Xiao Wei Sun Optical Tunneling to Improve Light Extraction in Quantum Dot and Perovskite Light-Emitting Diodes IEEE Photonics Journal Optical tunneling light extraction efficiency quantum dot light-emitting diodes perovskite light-emitting diodes |
| title | Optical Tunneling to Improve Light Extraction in Quantum Dot and Perovskite Light-Emitting Diodes |
| title_full | Optical Tunneling to Improve Light Extraction in Quantum Dot and Perovskite Light-Emitting Diodes |
| title_fullStr | Optical Tunneling to Improve Light Extraction in Quantum Dot and Perovskite Light-Emitting Diodes |
| title_full_unstemmed | Optical Tunneling to Improve Light Extraction in Quantum Dot and Perovskite Light-Emitting Diodes |
| title_short | Optical Tunneling to Improve Light Extraction in Quantum Dot and Perovskite Light-Emitting Diodes |
| title_sort | optical tunneling to improve light extraction in quantum dot and perovskite light emitting diodes |
| topic | Optical tunneling light extraction efficiency quantum dot light-emitting diodes perovskite light-emitting diodes |
| url | https://ieeexplore.ieee.org/document/9261092/ |
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