Journal
NANOSCALE
Volume 10, Issue 41, Pages 19262-19271Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr06879h
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Funding
- National Natural Science Foundation of China [51571184, 21501165, 21875236, 21573211, 21633007]
- National Key R&D Program on Nano Science Technology [2016YFA0200602, 2018YFA0208702]
- Fundamental Research Funds for the Central Universities [WK2060190085, WK2340000063]
- Hefei National Synchrotron Radiation Laboratory [KY2060000111]
- Defense Industrial Technology Development Program [JCKY2016208B012]
- Recruitment Program of Thousand Youth Talents
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Although the efficiency of metal halide perovskite light emitting diodes (PeLEDs) has been improved to an attractive level, the poor stability of perovskite emitting layers is a major concern for the application of PeLEDs. Herein, we report a facile ligand-assisted precipitation synthesis of stable dual-phase CsPbBr3-CsPb2Br5 nanocrystals (NCs) for improving the stability of PeLEDs. In our synthetic process, the bromide-rich circumstance is beneficial to generate high quality dual-phase perovskite NCs with PLQY as high as 92% and a narrow emission linewidth (19 nm). More importantly, as-synthesized dual phase perovskite NCs exhibit extremely high thermal stability in heating tests in air with a considerable humidity of 30%-55% in comparison with previously reported single phase CsPbBr3 NCs. The aforementioned advantages of our synthesized dual-phase CsPbBr3-CsPb2Br5 NCs allow for the fabrication of light emitting layers of PeLEDs under ambient conditions. The fabricated green PeLED based on CsPbBr3-CsPb2Br5 NCs shows a low turn-on voltage of 2.5 V and a high brightness of 8383 cd m(-2) at 8 V. Owing to the high stability of dual-phase CsPbBr3-CsPb2Br5 NCs, the fabricated PeLED also exhibits better operational stability in comparison with those PeLEDs based on single phase CsPbBr3 NCs. Our work presents a new route to fabricate stable perovskite light-emitting diodes using room temperature precipitated dual-phase CsPbBr3-CsPb2Br5 NCs as emitting layer materials.
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