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- Title
Highly spectra-stable pure blue perovskite light-emitting diodes based on copper and potassium co-doped quantum dots.
- Authors
Chen, Fang; Ming, Wenjie; Li, Yongfei; Gao, Yun; Pasquale, Lea; Yao, Kexin; Huang, Boyuan; Cai, Qiuting; Lu, Guochao; Song, Jizhong; Prato, Mirko; Dai, Xingliang; He, Haiping; Ye, Zhizhen
- Abstract
Halide perovskite light emitting diodes (LEDs) have gained great progress in recent years. However, mixed-halide perovskites for blue LEDs usually suffer from electroluminescence (EL) spectra shift at a high applied voltage or current density, limiting their efficiency. In this work, we report a strategy of using single-layer perovskite quantum dots (QDs) film to tackle the electroluminescence spectra shift in pure-blue perovskite LEDs and improve the LED efficiency by co-doping copper and potassium in the mixed-halide perovskite QDs. As a result, we obtained pure-blue halide perovskite QD-LEDs with stable EL spectra centred at 469 nm even at a current density of 1,617 mA·cm−2. The optimal device presents a maximum external quantum efficiency (EQE) of 2.0%. The average maximum EQE and luminance of the LEDs are 1.49% and 393 cd·m−2, increasing 62% and 66% compared with the control LEDs. Our study provides an effective strategy for achieving spectra-stable and highly efficient pure-blue perovskite LEDs.
- Subjects
LIGHT emitting diodes; QUANTUM dots; ELECTROLUMINESCENCE; COPPER; PEROVSKITE; DOPING agents (Chemistry); INDIUM gallium nitride; QUANTUM efficiency
- Publication
Nano Research, 2023, Vol 16, Issue 5, p7654
- ISSN
1998-0124
- Publication type
Article
- DOI
10.1007/s12274-023-5452-1