TY - JOUR
T1 - FAPbBr3/Cs4PbBr6Core/Shell Perovskite Nanocrystals with Enhanced Stability and Emission
T2 - Implications for LEDs
AU - Zeng, Yicheng
AU - Chen, Weiwei
AU - Deng, Yuan
AU - Gu, Wanying
AU - Wu, Chenxi
AU - Guo, Yating
AU - Huang, Pan
AU - Liu, Fangze
AU - Li, Hongbo
N1 - Publisher Copyright:
© 2022 American Chemical Society.
PY - 2022/7/22
Y1 - 2022/7/22
N2 - Formamidinium lead bromide (FAPbBr3) nanocrystals (NCs) have been demonstrated to exhibit ideal ultrapure green luminescence at 530 nm and to hold great potential in light-emitting diodes, by potentially overcoming the difficulties facing cesium lead bromide (CsPbBr3) NCs. However, compared to all-inorganic lead halide perovskite NCs, organic-inorganic hybrid FAPbBr3 NCs are sensitive to moisture, oxygen, and heat due to their intrinsic instability caused by the organic cations (FA+). Herein, we present an epitaxial growth method for the overgrowth of a large-band-gap cesium lead halide (Cs4PbBr6) shell on the surface of FAPbBr3 NCs. The resulting core/shell NCs show a near-unity photoluminescence quantum yield (PLQY) of 97.1%, the emission with full width at half-maxima of 88 meV, and long-term environmental stability. The introduction of Cs+ into FAPbBr3 NCs can inhibit the migration of FA+ and suppress the phase transformation from cubic phase to tetragonal phase at 60 °C. Furthermore, the existence of shell can provide stronger exciton confinement and improve the thermal stability of FAPbBr3 NCs. The core/shell perovskite NCs developed in this study have the advantages of high PLQY and good stability and may contribute to the field of light-emitting diodes (LEDs).
AB - Formamidinium lead bromide (FAPbBr3) nanocrystals (NCs) have been demonstrated to exhibit ideal ultrapure green luminescence at 530 nm and to hold great potential in light-emitting diodes, by potentially overcoming the difficulties facing cesium lead bromide (CsPbBr3) NCs. However, compared to all-inorganic lead halide perovskite NCs, organic-inorganic hybrid FAPbBr3 NCs are sensitive to moisture, oxygen, and heat due to their intrinsic instability caused by the organic cations (FA+). Herein, we present an epitaxial growth method for the overgrowth of a large-band-gap cesium lead halide (Cs4PbBr6) shell on the surface of FAPbBr3 NCs. The resulting core/shell NCs show a near-unity photoluminescence quantum yield (PLQY) of 97.1%, the emission with full width at half-maxima of 88 meV, and long-term environmental stability. The introduction of Cs+ into FAPbBr3 NCs can inhibit the migration of FA+ and suppress the phase transformation from cubic phase to tetragonal phase at 60 °C. Furthermore, the existence of shell can provide stronger exciton confinement and improve the thermal stability of FAPbBr3 NCs. The core/shell perovskite NCs developed in this study have the advantages of high PLQY and good stability and may contribute to the field of light-emitting diodes (LEDs).
KW - core/shell nanocrystals
KW - formamidinium lead bromide
KW - photoluminescence quantum yield
KW - stability
KW - ultrapure green luminescence
UR - http://www.scopus.com/inward/record.url?scp=85135694194&partnerID=8YFLogxK
U2 - 10.1021/acsanm.2c01772
DO - 10.1021/acsanm.2c01772
M3 - Article
AN - SCOPUS:85135694194
SN - 2574-0970
VL - 5
SP - 9534
EP - 9543
JO - ACS Applied Nano Materials
JF - ACS Applied Nano Materials
IS - 7
ER -