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Defect Passivation for Red Perovskite Light-Emitting Diodes with Improved Brightness and Stability
Nanjing Tech Univ NanjingTech, Peoples R China.
Nanjing Tech Univ NanjingTech, Peoples R China.
Nanjing Tech Univ NanjingTech, Peoples R China.
Nanjing Tech Univ NanjingTech, Peoples R China.
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2019 (English)In: Journal of Physical Chemistry Letters, ISSN 1948-7185, E-ISSN 1948-7185, Vol. 10, no 3, p. 380-385Article in journal (Refereed) Published
Abstract [en]

Efficient and stable red perovskite light-emitting diodes (PeLEDs) are important for realizing full-color display and lighting. Red PeLEDs can be achieved either by mixed-halide or low-dimensional perovskites. However, the device performance, especially the brightness, is still low owing to phase separation or poor charge transport issues. Here, we demonstrate red PeLEDs based on three-dimensional (3D) mixed-halide perovskites where the defects are passivated by using 5-aminovaleric acid. The red PeLEDs with an emission peak at 690 nm exhibit an external quantum efficiency of 8.7% and a luminance of 1408 cd m(-2). A maximum luminance of 8547 cd m(-2) can be further achieved as tuning the emission peak to 662 nm, representing the highest brightness of red PeLEDs. Moreover, those LEDs exhibit a half-life of up to 8 h under a high constant current density of 100 mA cm(-2), which is over 10 times improvement compared to literature results.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 10, no 3, p. 380-385
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-154839DOI: 10.1021/acs.jpclett.8b03664ISI: 000458704800010PubMedID: 30596240OAI: oai:DiVA.org:liu-154839DiVA, id: diva2:1294591
Note

Funding Agencies|Major Research Plan of the National Natural Science Foundation of China [91733302]; European Union [2016YFE0112000]; National Basic Research Program of China-Fundamental Studies of Perovskite Solar Cells [2015CB932200]; National Key Research and Development Program of China [2017YFB0404500]; Natural Science Foundation of Jiangsu Province, China [BK20150043, BK20150064, BK20180085]; National Natural Science Foundation of China [11474164, 61875084, 61634001, 21601085, 11804156]; National Science Fund for Distinguished Young Scholars [61725502]; Synergetic Innovation Center for Organic Electronics and Information Displays

Available from: 2019-03-07 Created: 2019-03-07 Last updated: 2019-03-07

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