Mixed halide CsPb(Br1-xIx)3 nanocrystals for green, orange, and red light-emitting diodes

Cesium lead halide (CsPbX3; X = Cl, Br, and I)-based nanocrystals (NCs) are an attractive optoelectronic material for next-generation lighting and display applications. Except for green-emitting CsPbBr3-based NCs, however, there are few investigations for another visible wavelength spectral-ranged c...

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Published inJournal of alloys and compounds Vol. 858; p. 157643
Main Authors Moon, Seung-Gyun, Cho, Seung-Bum, Kim, Kyoung-Kook, Park, Il-Kyu
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 25.03.2021
Elsevier BV
Subjects
Cesium
Cesium lead halides
Doppler effect
Electroluminescence
Emitters
Iodine
Lead compounds
Light emitting diodes
Metal halides
Nanocrystals
Optoelectronics
Perovskite
Photoluminescence
Red shift
Spectral emittance
Wavelengths
Perovskite
Cesium lead halides
Nanocrystals
Light-emitting diodes
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Summary:Cesium lead halide (CsPbX3; X = Cl, Br, and I)-based nanocrystals (NCs) are an attractive optoelectronic material for next-generation lighting and display applications. Except for green-emitting CsPbBr3-based NCs, however, there are few investigations for another visible wavelength spectral-ranged color emitters, such as yellow, orange, and red light-emitting diodes (LEDs). This paper reports a facile synthesis of CsPb(Br1-xIx)3 NCs emitting wavelengths from green to red based on a halide exchange post-treatment using a trimethylsilyl iodide (TMSI) additive. Microstructural and optical investigations showed that the TMSI modulated the iodine content of CsPb(Br1-xIx)3 NCs, resulting in a successive shift of photoluminescence peaks from 510 to 663 nm. Based on CsPb(Br1-xIx)3 NCs, LEDs emitting from green to red wavelengths were demonstrated. Interestingly, CsPb(Br1-xIx)3 NCs exhibited abnormal electroluminescence (EL) spectra, showing a large red-shift and additional peaks corresponding to the pristine CsPbBr3 NCs. These were attributed to the modification of CsPb(Br1-xIx)3 NCs during the LED fabrication process as well as electrical field-induced phase-segregation during operation. •A facile synthetic method of CsPb(Br1-xIx)3 mixed halide perovskite alloyed nanocrystals is reported.•Green, orange, and red light-emitting diodes were demonstrated by CsPb(Br1-xIx)3 nanocrystals.•CsPb(Br1-xIx)3 nanocrystals exhibited double electroluminescence spectra due to phase separation.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.157643