Efficient single-component white light emitting diodes enabled by lanthanide ions doped lead halide perovskites via controlling Förster energy transfer and specific defect clearance

• Published in: Light, science & applications Vol. 11; no. 1; p. 340
• Main Authors: Sun, Rui, Zhou, Donglei, Ding, Yujiao, Wang, Yue, Wang, Yuqi, Zhuang, Xinmeng, Liu, Shuainan, Ding, Nan, Wang, Tianyuan, Xu, Wen, Song, Hongwei
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 06.12.2022; Springer Nature B.V; Nature Publishing Group
• Subjects: 119/118; 140/146; 639/624/1020/1089; 639/624/399/1017; Cadmium; Creatine; Electrical properties; Ions; Lasers; Light emitting diodes; Microwaves; Optical and Electronic Materials; Optical Devices; Optics; Phosphocreatine; Phospholipids; Photonics; Physics; Physics and Astronomy; RF and Optical Engineering
• ISSN: 2047-7538; 2095-5545; 2047-7538
• DOI: 10.1038/s41377-022-01027-9

Currently, a major challenge for metal-halide perovskite light emitting diodes (LEDs) is to achieve stable and efficient white light emission due to halide ion segregation. Herein, we report a promising method to fabricate white perovskite LEDs using lanthanide (Ln 3+ ) ions doped CsPbCl 3 perovskite nanocrystals (PeNCs). First, K + ions are doped into the lattice to tune the perovskite bandgap by partially substituting Cs + ions, which are well matched to the transition energy of some Ln 3+ ions from the ground state to the excited state, thereby greatly improving the Förster energy transfer efficiency from excitons to Ln 3+ ions. Then, creatine phosphate (CP), a phospholipid widely found in organisms, serves as a tightly binding surface-capping multi-functional ligand which regulates the film formation and enhances the optical and electrical properties of PeNC film. Consequently, the Eu 3+ doped PeNCs based-white LEDs show a peak luminance of 1678 cd m -2 and a maximum external quantum efficiency (EQE) of 5.4%, demonstrating excellent performance among existing white PeNC LEDs from a single chip. Furthermore, the method of bandgap modulation and the defect passivation were generalized to other Ln 3+ ions doped perovskite LEDs and successfully obtained improved electroluminescence (EL). This work demonstrates the comprehensive and universal strategies in the realization of highly efficient and stable white LEDs via single-component Ln 3+ ions doped PeNCs, which provides an optimal solution for the development of low-cost and simple white perovskite LEDs. Highly efficient and stable white LEDs were fabricated based on Eu 3+ doped Cs x K 1-x PbCl 3 PeNCs, in which the PeNC film experienced the band engineering and defect passivation treatment.