期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 50, 页码 47083-47090出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b17164
关键词
vacuum-deposited; all-inorganic perovskite; blue-emitting; high-throughput combinatorial approaches; stability
资金
- National Key RAMP
- D Program of China [2016YFB070700702]
- National Natural Science Foundation of China [51761145048]
- Fundamental Research Funds for the Central Universities [HUST:2019JYCXJJ004]
- Innovation Funds of WNLO
Perovskite light-emitting diodes (PeLEDs) have drawn great research attention because of their outstanding electroluminescence perform-ance by solution processing. PeLEDs made by thermal evaporation are relatively rarely explored but are compatible to existing organic light-emitting diode industrial lines. Blue-emitting PeLEDs are all based on organic-containing perovskites, rather than more stable all-inorganic perovskites because of their poor solubility, too fast crystallization, uneven discrete films, and unattainable pure blue emission. Here, we report all-inorganic, vacuum-processed blue PeLEDs. High-throughput combinatorial approaches are employed to optimize Cs-Pb-Br-Cl composition in our dual-source co-evaporation system to achieve the balance between film photoluminescence and injection efficiency. The as-deposited perovskite films demonstrated excellent intrinsic stability against heat, UV-light, and humidity attack. A series of PeLEDs were obtained covering the standard blue spectral region with a best luminance of 121 cd/m(2) and an external quantum efficiency of 0.38%. We believe that the vacuum processing strategy demonstrated here provides a very promising alternative way to produce efficient and stable all-inorganic blue-emitting PeLEDs.
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