Reducing Architecture Limitations for Efficient Blue Perovskite Light‐Emitting Diodes
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- Mahesh K. Gangishetty
- Rowland Institute at Harvard University Cambridge MA 02142 USA
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- Shaocong Hou
- Rowland Institute at Harvard University Cambridge MA 02142 USA
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- Qimin Quan
- Rowland Institute at Harvard University Cambridge MA 02142 USA
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- Daniel N. Congreve
- Rowland Institute at Harvard University Cambridge MA 02142 USA
説明
<jats:title>Abstract</jats:title><jats:p>Light‐emitting diodes utilizing perovskite nanocrystals have generated strong interest in the past several years, with green and red devices showing high efficiencies. Blue devices, however, have lagged significantly behind. Here, it is shown that the device architecture plays a key role in this lag and that NiO<jats:italic><jats:sub>x</jats:sub></jats:italic>, a transport layer in one of the highest efficiency devices to date, causes a significant reduction in perovskite luminescence lifetime. An alternate transport layer structure which maintains robust nanocrystal emission is proposed. Devices with this architecture show external quantum efficiencies of 0.50% at 469 nm, seven times higher than state‐of‐the‐art devices at that wavelength. Finally, it is demonstrated that this architecture enables efficient devices across the entire blue‐green portion of the spectrum. The improvements demonstrated here open the door to efficient blue perovskite light‐emitting diodes.</jats:p>
収録刊行物
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- Advanced Materials
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Advanced Materials 30 (20), 2018-03-25
Wiley