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Perovskite Light-Emitting Diodes
CCS Chemistry ( IF 9.4 ) Pub Date : 2020/6/17 , DOI: 10.31635/ccschem.020.202000216 Chenyang Zhao 1 , Dezhong Zhang 1 , Chuanjiang Qin 1
CCS Chemistry ( IF 9.4 ) Pub Date : 2020/6/17 , DOI: 10.31635/ccschem.020.202000216 Chenyang Zhao 1 , Dezhong Zhang 1 , Chuanjiang Qin 1
Affiliation
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Perovskites show exciting potential for photoelectric applications, especially for light-emitting diodes (LEDs), owing to their intrinsically high photoluminescence efficiency and color purity. With efforts made over the last 5 years, the external quantum efficiency (EQE) of lead-halide perovskite-based LEDs has sharply increased beyond 20%, which is comparable to the performance of existing lighting technology. Strategies, including defect passivation, the formation of low-dimensional quantum-well structure perovskites, and a combination of appropriate electron and hole transport materials in electroluminescent devices, not only effectively increases photoluminescence quantum efficiency but also enhances light outcoupling efficiency and carrier transport balance, thus promoting higher efficiency of perovskite LEDs. In this mini review, we will focus on how the EQE can be further increased through diverse perovskite optimization and reasonable device engineering. Furthermore, remaining issues, such as efficiency roll-off at high current density, poor stability, and modest blue perovskite LEDs, are briefly discussed. Perovskite LEDs with high efficiency and long-term stability will accelerate their practical applicability in everyday life.
中文翻译：
钙钛矿发光二极管
钙钛矿因其固有的高光致发光效率和色纯度而在光电应用中显示出令人兴奋的潜力，尤其是对于发光二极管（LED）。经过近五年的努力，基于钙钛矿的卤化铅的LED的外部量子效率（EQE）急剧提高了20％以上，与现有照明技术的性能相当。包括缺陷钝化，低维量子阱结构钙钛矿的形成以及电致发光器件中适当的电子和空穴传输材料的组合在内的策略，不仅有效地提高了光致发光的量子效率，而且还增强了光输出耦合效率和载流子传输平衡，从而提高了钙钛矿LED的效率。在这个迷你评论中，我们将重点介绍如何通过各种钙钛矿优化和合理的设备工程来进一步提高EQE。此外，还简要讨论了剩余问题，例如高电流密度下的效率下降，稳定性差以及适度的蓝色钙钛矿LED。具有高效率和长期稳定性的钙钛矿LED将加速其在日常生活中的实用性。
更新日期：2020-09-16
中文翻译：
钙钛矿发光二极管
钙钛矿因其固有的高光致发光效率和色纯度而在光电应用中显示出令人兴奋的潜力，尤其是对于发光二极管（LED）。经过近五年的努力，基于钙钛矿的卤化铅的LED的外部量子效率（EQE）急剧提高了20％以上，与现有照明技术的性能相当。包括缺陷钝化，低维量子阱结构钙钛矿的形成以及电致发光器件中适当的电子和空穴传输材料的组合在内的策略，不仅有效地提高了光致发光的量子效率，而且还增强了光输出耦合效率和载流子传输平衡，从而提高了钙钛矿LED的效率。在这个迷你评论中，我们将重点介绍如何通过各种钙钛矿优化和合理的设备工程来进一步提高EQE。此外，还简要讨论了剩余问题，例如高电流密度下的效率下降，稳定性差以及适度的蓝色钙钛矿LED。具有高效率和长期稳定性的钙钛矿LED将加速其在日常生活中的实用性。
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