Title： | Highly Efficient Hybrid Perovskite/Organic Tandem White Light-Emitting Diodes with External Quantum Efficiency Exceeding 20% |
Authors： | Shuang-Qiao Sun1#, Yating Cai4#, Min Zhu1#, Wei He1, Bo-Chen Liu1, Yan-Lin Xu1, Xuan Lv1, Qi Sun1, Pengyi Liu4, Tingting Shi4*, Yue-Min Xie1,3*, & Man-Keung Fung1,2* |
Institutions： | 1Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University 2Macao Institute of Materials Science and Engineering (MIMSE), MUST-SUDA Joint Research Center for Advanced Functional Materials, Zhuhai MUST Science and Technology Research Institute, Macau University of Science and Technology, Taipa 999078, Macau, China 3Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Soochow University, Suzhou, 215123, Jiangsu, PR China 4Siyuan Laboratory, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Department of Physics，Jinan University, Guangzhou, Guangdong 510632, P. R. China |
Abstract： | Perovskite light-emitting diodes (PeLEDs) have shown great potential for low-cost display and lighting technologies, and all-inorganic blue PeLEDs are recognized as a promising substitute for blue fluorescent/phosphorescent organic light-emitting diodes (OLEDs) owing to their superior color purity and great stability potential. However, confined by the solution fabrication process, depositing multi-layered white PeLEDs remains a challenge. Here, a newly designed hybrid perovskite/organic tandem white LED (POTWLED), integrated with a bottom blue PeLED unit and a top orange/(orange + red) OLED unit, to prevent damage to the underlying perovskite layer caused by the deposition of the top emitting layers, is reported. To optimize the performance of POTWLEDs, a conductive passivator of 2,8-bis(diphenylphosphoryl)dibenzo[b,d] thiophene, with a strong surface binding group of P═O, is introduced to passivate perovskite defects, which promotes a maximum external quantum efficiency (EQE) of 17.3% for blue PeLEDs with an emission peak at 488 nm. As a result, based on the optimized blue PeLED units, a maximum EQE of 23.9% with a low color temperature of 2522 K is obtained for POTWLEDs, which is the highest efficiency for perovskite-based WLEDs, illustrating the great potential of the hybrid tandem device in fabricating high-performance perovskite-based WLEDs. |
IF： | 19.924 |
Link： |
Editor: Guo Jia