TY - JOUR
T1 - Green Photoluminescence of Perovskite CsPb(Br1- xIx)3 Nanocrystals for Wide Color Gamut Displays
AU - Miyata, Simpei
AU - Iso, Yoshiki
AU - Isobe, Tetsuhiko
N1 - Funding Information:
The authors are grateful for the financial supports by the Futaba Research Grant Program of the Futaba Foundation (T.I.), the Iketani Science and Technology Foundation (T.I.), and the Shorai Foundation for Science and Technology (Y.I.).
Publisher Copyright:
Copyright © 2019 American Chemical Society.
PY - 2019/9/17
Y1 - 2019/9/17
N2 - All-inorganic mixed-halide CsPb(Br1-xIx)3 perovskite nanocrystals (NCs) are excellent candidates for green-emitting phosphors in wide color gamut displays; however, a detailed investigation of their photoluminescence (PL) properties based on the halide composition has been missing. In this work, we report a fundamental investigation of the changes in the PL properties of CsPb(Br1-xIx)3 NCs. The PL color of the NCs, which were prepared by a hot-injection method, changed from green to red with increasing iodide composition (x). Almost ideal green emission close to the chromaticity coordinates of the green vertex of the BT.2020 standard was achieved by appropriately substituting iodide ions for bromide ions in monohalide CsPbBr3 NCs. However, the PL peak width of the mix-halide NCs at x ∼0.5 was 0.127 eV, which was broader than the 0.105 eV peak width of the monohalide CsPbBr3 NCs. This phenomenon should be due to the compositional inhomogeneity among the individual CsPb(Br1-xIx)3 NCs. On the other hand, the PL quantum yield (PLQY) for the monohalide CsPbBr3 NCs decreased from 70 to 25% as x increased to 0.5. This result may be attributed to lattice distortion by the difference in the ionic radii of bromide and iodide. Improvements in the compositional inhomogeneity and lattice distortion would enhance the color purity of the green emission and the PLQY, respectively, of the CsPb(Br1-xIx)3 NCs.
AB - All-inorganic mixed-halide CsPb(Br1-xIx)3 perovskite nanocrystals (NCs) are excellent candidates for green-emitting phosphors in wide color gamut displays; however, a detailed investigation of their photoluminescence (PL) properties based on the halide composition has been missing. In this work, we report a fundamental investigation of the changes in the PL properties of CsPb(Br1-xIx)3 NCs. The PL color of the NCs, which were prepared by a hot-injection method, changed from green to red with increasing iodide composition (x). Almost ideal green emission close to the chromaticity coordinates of the green vertex of the BT.2020 standard was achieved by appropriately substituting iodide ions for bromide ions in monohalide CsPbBr3 NCs. However, the PL peak width of the mix-halide NCs at x ∼0.5 was 0.127 eV, which was broader than the 0.105 eV peak width of the monohalide CsPbBr3 NCs. This phenomenon should be due to the compositional inhomogeneity among the individual CsPb(Br1-xIx)3 NCs. On the other hand, the PL quantum yield (PLQY) for the monohalide CsPbBr3 NCs decreased from 70 to 25% as x increased to 0.5. This result may be attributed to lattice distortion by the difference in the ionic radii of bromide and iodide. Improvements in the compositional inhomogeneity and lattice distortion would enhance the color purity of the green emission and the PLQY, respectively, of the CsPb(Br1-xIx)3 NCs.
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U2 - 10.1021/acsomega.9b01858
DO - 10.1021/acsomega.9b01858
M3 - Article
AN - SCOPUS:85072721902
SN - 2470-1343
VL - 4
SP - 15067
EP - 15073
JO - ACS Omega
JF - ACS Omega
IS - 12
ER -