Zheng Song, Wang Zhibin, Jiang Naizhong, Huang Hailiang, Wu Ximing, Li Dan, Teng Qian, Li Jinyang, Li Chenhao, Li Jinsui, Pang Tao, Zeng Lingwei, Zhang Ruidan, Huang Feng, Lei Lei, Wu Tianmin, Yuan Fanglong, Chen Daqin
College of Physics and Energy, Fujian Normal University, Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, Fuzhou 350117, China.
Key Laboratory of Theoretical and Computational Photochemistry of Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, China.
Sci Adv. 2024 Sep 6;10(36):eadp8473. doi: 10.1126/sciadv.adp8473.
The poor operational stability of perovskite light-emitting diodes (PeLEDs) remains a major obstacle to their commercial application. Achieving high brightness and quantum efficiency at low driving voltages, thus effectively reducing heat accumulation, is key to enhancing the operational lifetime of PeLEDs. Here, we present a breakthrough, attaining a record-low driving voltage while maintaining high brightness and efficiency. By thoroughly suppressing interface recombination and ensuring excellent charge transport, our PeLEDs, with an emission peak at 515 nanometers, achieve a maximum brightness of 90,295 candelas per square meter and a peak external quantum efficiency of 27.8% with an ultralow turn-on voltage of 1.7 volts (~70% bandgap voltage). Notably, Joule heat is nearly negligible at these low driving voltages, substantially extending the operational lifetime to 7691.1 hours. Our optimized strategies effectively tackle stability issue through thermal management, paving the way for highly stable PeLEDs.
钙钛矿发光二极管（PeLEDs）较差的工作稳定性仍然是其商业应用的主要障碍。在低驱动电压下实现高亮度和量子效率，从而有效减少热量积累，是提高PeLEDs工作寿命的关键。在此，我们取得了一项突破，在保持高亮度和效率的同时，实现了创纪录的低驱动电压。通过彻底抑制界面复合并确保优异的电荷传输，我们的PeLEDs发射峰位于515纳米，实现了每平方米90295坎德拉的最大亮度和27.8%的峰值外量子效率，开启电压低至1.7伏（约为带隙电压的70%）。值得注意的是，在这些低驱动电压下，焦耳热几乎可以忽略不计，工作寿命大幅延长至7691.1小时。我们的优化策略通过热管理有效解决了稳定性问题，为高稳定性的PeLEDs铺平了道路。
