High-Efficiency Tandem White Perovskite Light-Emitting Diodes by Using an Organic/Inorganic Intermediate Connector
The performance of monochromatic perovskite light-emitting diodes (PeLEDs) has undergone rapid development in recent years, while white PeLEDs are still in their infancy. The tandem devices prepared by connecting light-emitting units of different colors with intermediate connectors comprise one of t...
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MDPI AG
2022-09-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/12/9/1286 |
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| author | Yu Yan Qi Zhang Zhijian Wang Qifeng Du Ruitao Tang Xiaoyu Wang |
| author_facet | Yu Yan Qi Zhang Zhijian Wang Qifeng Du Ruitao Tang Xiaoyu Wang |
| author_sort | Yu Yan |
| collection | DOAJ |
| description | The performance of monochromatic perovskite light-emitting diodes (PeLEDs) has undergone rapid development in recent years, while white PeLEDs are still in their infancy. The tandem devices prepared by connecting light-emitting units of different colors with intermediate connectors comprise one of the promising approaches for realizing white light emission. The intermediate connector plays a crucial role in determining the effectiveness of the light-emitting units. In this work, all-perovskite-based white LEDs are assembled by employing sky-blue (490 nm) and red (690 nm) perovskite emitters as active layers. With mixed p-type and n-type organic charge transport materials as the intermediate connector, the highest external quantum efficiency (EQE) of the device was 1.4%, the electroluminescence (EL) peak position of the blue light part was shifted to 512 nm, and the red light part was shifted to 673 nm. In contrast, with organic and inorganic charge transport materials as the intermediate connector, the devices exhibited better charge generation/injection capabilities and a record EQE of 8.5%. The EL peak position of the device prepared from the stored film was not shifted, implying that the organic/inorganic layer effectively suppresses halide migration. Our work paves the way for highly efficient tandem white PeLEDs. |
| first_indexed | 2024-03-10T00:19:48Z |
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| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-10T00:19:48Z |
| publishDate | 2022-09-01 |
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| record_format | Article |
| series | Crystals |
| spelling | doaj.art-5df197b03cb740d7b459cdf04a19bb7e2023-11-23T15:44:34ZengMDPI AGCrystals2073-43522022-09-01129128610.3390/cryst12091286High-Efficiency Tandem White Perovskite Light-Emitting Diodes by Using an Organic/Inorganic Intermediate ConnectorYu Yan0Qi Zhang1Zhijian Wang2Qifeng Du3Ruitao Tang4Xiaoyu Wang5Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, ChinaQiantang Science and Technology Innovation Center, Hangzhou 310018, ChinaJiaxing Key Laboratory of Flexible Electronics-Based Intelligent Sensing and Advanced Manufacturing Technology, Institute of Flexible Electronics Technology of THU, Jiaxing 314006, ChinaJiaxing Key Laboratory of Flexible Electronics-Based Intelligent Sensing and Advanced Manufacturing Technology, Institute of Flexible Electronics Technology of THU, Jiaxing 314006, ChinaJiaxing Key Laboratory of Flexible Electronics-Based Intelligent Sensing and Advanced Manufacturing Technology, Institute of Flexible Electronics Technology of THU, Jiaxing 314006, ChinaQiantang Science and Technology Innovation Center, Hangzhou 310018, ChinaThe performance of monochromatic perovskite light-emitting diodes (PeLEDs) has undergone rapid development in recent years, while white PeLEDs are still in their infancy. The tandem devices prepared by connecting light-emitting units of different colors with intermediate connectors comprise one of the promising approaches for realizing white light emission. The intermediate connector plays a crucial role in determining the effectiveness of the light-emitting units. In this work, all-perovskite-based white LEDs are assembled by employing sky-blue (490 nm) and red (690 nm) perovskite emitters as active layers. With mixed p-type and n-type organic charge transport materials as the intermediate connector, the highest external quantum efficiency (EQE) of the device was 1.4%, the electroluminescence (EL) peak position of the blue light part was shifted to 512 nm, and the red light part was shifted to 673 nm. In contrast, with organic and inorganic charge transport materials as the intermediate connector, the devices exhibited better charge generation/injection capabilities and a record EQE of 8.5%. The EL peak position of the device prepared from the stored film was not shifted, implying that the organic/inorganic layer effectively suppresses halide migration. Our work paves the way for highly efficient tandem white PeLEDs.https://www.mdpi.com/2073-4352/12/9/1286tandemwhite perovskite light-emitting diodesorganic/inorganic intermediate connector |
| spellingShingle | Yu Yan Qi Zhang Zhijian Wang Qifeng Du Ruitao Tang Xiaoyu Wang High-Efficiency Tandem White Perovskite Light-Emitting Diodes by Using an Organic/Inorganic Intermediate Connector Crystals tandem white perovskite light-emitting diodes organic/inorganic intermediate connector |
| title | High-Efficiency Tandem White Perovskite Light-Emitting Diodes by Using an Organic/Inorganic Intermediate Connector |
| title_full | High-Efficiency Tandem White Perovskite Light-Emitting Diodes by Using an Organic/Inorganic Intermediate Connector |
| title_fullStr | High-Efficiency Tandem White Perovskite Light-Emitting Diodes by Using an Organic/Inorganic Intermediate Connector |
| title_full_unstemmed | High-Efficiency Tandem White Perovskite Light-Emitting Diodes by Using an Organic/Inorganic Intermediate Connector |
| title_short | High-Efficiency Tandem White Perovskite Light-Emitting Diodes by Using an Organic/Inorganic Intermediate Connector |
| title_sort | high efficiency tandem white perovskite light emitting diodes by using an organic inorganic intermediate connector |
| topic | tandem white perovskite light-emitting diodes organic/inorganic intermediate connector |
| url | https://www.mdpi.com/2073-4352/12/9/1286 |
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