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Strategy of Solution-Processed All-Inorganic Heterostructure for Humidity/Temperature-Stable Perovskite Quantum Dot Light-Emitting Diodes
ACS Nano ( IF 15.8 ) Pub Date : 2018-01-16 00:00:00 , DOI: 10.1021/acsnano.7b07856 Zhifeng Shi 1 , Sen Li 1 , Ying Li 1 , Huifang Ji 1 , Xinjian Li 1 , Di Wu 1 , Tingting Xu 1 , Yongsheng Chen 1 , Yongtao Tian 1 , Yuantao Zhang 2 , Chongxin Shan 1, 3 , Guotong Du 2
ACS Nano ( IF 15.8 ) Pub Date : 2018-01-16 00:00:00 , DOI: 10.1021/acsnano.7b07856 Zhifeng Shi 1 , Sen Li 1 , Ying Li 1 , Huifang Ji 1 , Xinjian Li 1 , Di Wu 1 , Tingting Xu 1 , Yongsheng Chen 1 , Yongtao Tian 1 , Yuantao Zhang 2 , Chongxin Shan 1, 3 , Guotong Du 2
Affiliation
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Recently, a pressing requirement of solid-state lighting sources with high performance and low cost has motivated increasing research in metal halide perovskites. However, the relatively low emission efficiency and poor operation stability of perovskite light-emitting diodes (LEDs) are still critical drawbacks. In this study, a strategy of solution-processed all-inorganic heterostructure was proposed to overcome the emission efficiency and operation stability issues facing the challenges of perovskite LEDs. Solution-processed n-ZnO nanoparticles and p-NiO are used as the carrier injectors to fabricate all-inorganic heterostructured CsPbBr3 quantum dot LEDs, and a high-efficiency green emission is achieved with maximum luminance of 6093.2 cd/m2, external quantum efficiency of 3.79%, and current efficiency of 7.96 cd/A. More importantly, the studied perovskite LEDs possess a good operation stability after a long test time in air ambient. Typically, the devices can endure a high humidity (75%, 12 h) and a high working temperature (393 K, three heating/cooling cycles) even without encapsulation, and the operation stability is better than any previous reports. It is anticipated that this work will provide an effective strategy for the fabrication of high-performance perovskite LEDs with good stability under ambient and harsh conditions, making practical applications of such LEDs a real possibility.
中文翻译：
湿度/温度稳定钙钛矿量子点发光二极管固溶全无机异质结构的策略
近年来，对高性能和低成本的固态光源的迫切需求促使了对金属卤化物钙钛矿的研究不断增加。然而，钙钛矿发光二极管（LED）的相对较低的发射效率和较差的操作稳定性仍然是关键的缺点。在这项研究中，提出了一种固溶处理的全无机异质结构的策略，以克服钙钛矿LED面临的发光效率和操作稳定性问题。溶液处理的n-ZnO纳米颗粒和p-NiO用作载流子注入器以制造全无机异质结构CsPbBr 3量子点LED，并实现了高效率的绿色发射，最大亮度为6093.2 cd / m 2，外部量子效率为3.79％，电流效率为7.96 cd / A。更重要的是，所研究的钙钛矿LED在空气环境中经过长时间的测试后，具有良好的操作稳定性。通常，即使没有封装，这些设备也可以承受高湿度（75％，12小时）和高工作温度（393 K，三个加热/冷却循环），并且操作稳定性比任何以前的报告都要好。预计这项工作将为制造高性能钙钛矿型LED提供有效的策略，该钙钛矿型LED在环境和恶劣条件下具有良好的稳定性，使这种LED的实际应用成为现实。
更新日期：2018-01-16
中文翻译：
湿度/温度稳定钙钛矿量子点发光二极管固溶全无机异质结构的策略
近年来，对高性能和低成本的固态光源的迫切需求促使了对金属卤化物钙钛矿的研究不断增加。然而，钙钛矿发光二极管（LED）的相对较低的发射效率和较差的操作稳定性仍然是关键的缺点。在这项研究中，提出了一种固溶处理的全无机异质结构的策略，以克服钙钛矿LED面临的发光效率和操作稳定性问题。溶液处理的n-ZnO纳米颗粒和p-NiO用作载流子注入器以制造全无机异质结构CsPbBr 3量子点LED，并实现了高效率的绿色发射，最大亮度为6093.2 cd / m 2，外部量子效率为3.79％，电流效率为7.96 cd / A。更重要的是，所研究的钙钛矿LED在空气环境中经过长时间的测试后，具有良好的操作稳定性。通常，即使没有封装，这些设备也可以承受高湿度（75％，12小时）和高工作温度（393 K，三个加热/冷却循环），并且操作稳定性比任何以前的报告都要好。预计这项工作将为制造高性能钙钛矿型LED提供有效的策略，该钙钛矿型LED在环境和恶劣条件下具有良好的稳定性，使这种LED的实际应用成为现实。
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