| Autor: |
Qingxun Guo, Liang Wang, Longbo Yang, Jiashun Duan, Hainan Du, Guoqi Ji, Nian Liu, Xue Zhao, Chao Chen, Ling Xu, Liang Gao, Jiajun Luo, Jiang Tang |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Science Advances. 8 |
| ISSN: |
2375-2548 |
| DOI: |
10.1126/sciadv.abq2148 |
| Popis: |
Next-generation wide color gamut displays require the development of efficient and toxic-free light-emitting materials meeting the crucial Rec. 2020 standard. With the rapid progress of green and red perovskite light-emitting diodes (PeLEDs), blue PeLEDs remain a central challenge because of the undesirable color coordinates and poor spectra stability. Here, we report Cs 3 CeBr x I 6− x ( x = 0 to 6) with the cryolite-like structure and stable and tunable color coordinates from (0.17, 0.02) to (0.15, 0.04). Further encouraged by the short exciton lifetime (26.1 ns) and high photoluminescence quantum yield (~76%), we construct Cs 3 CeBr x I 6− x -based rare-earth LEDs via thermal evaporation. A seed layer strategy is conducted to improve the device’s performance. The optimal Cs 3 CeI 6 device achieves a maximum external quantum efficiency of 3.5% and a luminance of 470 cd m −2 with stable deep-blue color coordinates of (0.15, 0.04). Our work opens another avenue to achieving efficient and spectrally stable deep-blue LEDs. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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