Recently, Zheng Song, a doctoral student in condensed matter physics at the College of Physics and Energy, made a significant breakthrough in the field of perovskite light-emitting diodes (PeLEDs). Guided by Associate Professor Wang Zhibin and Professor Chen Daqin, Zheng utilized the principle of "thermal-assisted upconversion luminescence" to suppress the intrinsic Joule heat of the device. This approach achieved ultra-high brightness and efficiency at low driving voltages. The green PeLED demonstrated a low turn-on voltage of just 1.7V, with peak brightness and an external quantum efficiency (EQE) reaching 90,295 cd/m² and 27.8%, respectively. This strategy not only enhances the device’s performance but also extends its operating lifespan, offering new insights into the development of efficient and stable PeLEDs.
The research was published in Science Advances, a sub-journal of Science, under the title "Ultralow voltage-driven efficient and stable perovskite light-emitting diodes." Fujian Normal University is the primary affiliation, with Zheng Song as the first author. Co-corresponding authors include Professor Yuan Fanglong from Beijing Normal University, and Associate Professor Wang Zhibin and Professor Chen Daqin from FJNU. The work was supported by the National Natural Science Foundation of China and the Fujian Provincial Natural Science Key Foundation.
Link: https://www.science.org/doi/10.1126/sciadv.adp8473
(translated by Huang Jie, reviewed by Hu Wen)