TY - JOUR
T1 - Mixed halide CsPb(Br1-xIx)3 nanocrystals for green, orange, and red light-emitting diodes
AU - Moon, Seung Gyun
AU - Cho, Seung Bum
AU - Kim, Kyoung Kook
AU - Park, Il Kyu
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/3/25
Y1 - 2021/3/25
N2 - 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.
AB - 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.
KW - Cesium lead halides
KW - Light-emitting diodes
KW - Nanocrystals
KW - Perovskite
UR - http://www.scopus.com/inward/record.url?scp=85094573054&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2020.157643
DO - 10.1016/j.jallcom.2020.157643
M3 - Article
AN - SCOPUS:85094573054
SN - 0925-8388
VL - 858
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 157643
ER -