AI Article Synopsis
- Mixed-halide perovskites are promising candidates for blue light-emitting diodes (PeLEDs), but they face issues with halide migration, especially in those with high chloride content.
- Researchers found that by adjusting the degree of local lattice distortion (LLD), they could increase the energy barrier for halide migration, improving stability.
- Using "A-site" cation engineering, they optimized LLD, leading to blue PeLEDs with a maximum external quantum efficiency (EQE) of 14.2% and impressive spectral stability during operation.
Article Abstract
Mixed-halide perovskites are considered the most straightforward candidate to realize blue perovskite light-emitting diodes (PeLEDs). However, they suffer severe halide migration, leading to spectral instability, which is particularly exaggerated in high chloride alloying perovskites. Here, we demonstrate energy barrier of halide migration can be tuned by manipulating the degree of local lattice distortion (LLD). Enlarging the LLD degree to a suitable level can increase the halide migration energy barrier. We herein report an "A-site" cation engineering to tune the LLD degree to an optimal level. DFT simulation and experimental data confirm that LLD manipulation suppresses the halide migration in perovskites. Conclusively, mixed-halide blue PeLEDs with a champion EQE of 14.2 % at 475 nm have been achieved. Moreover, the devices exhibit excellent operational spectral stability (T of 72 min), representing one of the most efficient and stable pure-blue PeLEDs reported yet.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/anie.202302184 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!