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Spectral-Stable Blue Emission from Moisture-Treated Low-Dimensional Lead Bromide-Based Perovskite Films
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering. Soochow Univ, Peoples R China.
Soochow Univ, Peoples R China.
Soochow Univ, Peoples R China.
Soochow Univ, Peoples R China.
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2019 (English)In: ACS Photonics, E-ISSN 2330-4022, Vol. 6, no 7, p. 1728-1735Article in journal (Refereed) Published
Abstract [en]

Highly efficient light-emitting diodes (LEDs) based on metal halide perovskites with green, red, and near-infrared electro-luminescence have been widely demonstrated. However, the development of their blue counterparts is still hampered due to the difficult deposition of efficient and spectral-stable blue-emitting active layers. Here, we report a facile and general approach that uses a moisture treatment in combination with the precursor stoichiometry engineering for the fabrication of efficient and color stable blue-emitting perovskite films. We find that, with a short-term moisture exposure, light emission from Ruddlesden Popper lead bromide-based perovskite films exhibit a continuous blue-shift from 512 to 475 nm through incorporating excess CsBr in the precursors. In addition, we observe that the formed Cs4PbBr6 phase under CsBr-rich condition is favorable to stabilize the blue emission of the resulting films. The corresponding blue-emitting perovskite films exhibit a photoluminescence quantum efficiency of over 20%, delivering sky-blue perovskite LEDs with no change in the light emission even under high voltage. Our strategy provides an alternative way for realizing efficient and spectrally stable active layers for the further development of blue-emitting perovskite LEDs.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 6, no 7, p. 1728-1735
Keywords [en]
metal halide perovskites; light-emitting diodes; moisture exposure; Cs4PbBr6; spectral stability
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:liu:diva-159590DOI: 10.1021/acsphotonics.9b00435ISI: 000476684300020OAI: oai:DiVA.org:liu-159590DiVA, id: diva2:1342291
Note

Funding Agencies|National Key Research and Development Program of China [2016YFA0202402]; National Natural Science Foundation of China [91833303, 61674108]; Jiangsu High Educational Natural Science Foundation [18KJA430012]; Priority Academic Program Development of Jiangsu Higher Education Institutions; 111 program; Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC); Postgraduate Research and Practice Innovation Program of Jiangsu Province [KYCX18_2504]; China Scholarship Council [201806920071]

Available from: 2019-08-13 Created: 2019-08-13 Last updated: 2019-08-13

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Zou, YataoBai, SaiGao, Feng
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