首页|Incorporation sodium ions into monodisperse lead-free double perovskite Cs2AgBiCl6 nanocrystals to improve optical properties
Incorporation sodium ions into monodisperse lead-free double perovskite Cs2AgBiCl6 nanocrystals to improve optical properties
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Lead-free double perovskite nanocrystals(NCs)have emerged as a promising candidate in the optical field,owing to their non-toxic,good moist heat and chemical stability.However,their poor optical proper-ties limited their application.To improve the optical properties of lead-free double perovskite NCs,metal ion doping or alloying had been suggested as a promising strategy.Here,we prepared monodisperse,uniformly sized,cubic morphology of Cs2AgBiCl6 NCs with different Na+incorporation amounts via a simple hot-injection method.The Na+incorporation broke the parity-forbidden transition by reducing the inversion symmetry of the electron wave function at the Ag site,which changed the parity of the self-trapped exciton wave function and thus allowed radiative recombination.As a result,the photolumi-nescence quantum yield(PLQY)of Na+-alloyed Cs2AgBiCl6 NCs(12.1％)was higher than that of Cs2AgBiCl6 NCs(2.4％),and the exciton lifetime of Na+-alloyed Cs2AgBiCl6 NCs increased to 36.98 ns from 17.58 ns for Cs2AgBiCl6 NCs.By adjusting the amount of Na+incorporation,the band gap of Cs2AgBiCl6 NCs can be significantly tuned from～2.90 eV to～3.50 eV.Furthermore,the temperature-dependent photolu-minescence spectra indicated that the Na+-alloyed Cs2AgBiCl6 NCs possessed higher longitudinal optical phonon energy and exciton binding energy compared to Cs2AgBiCl6 NCs.This suggested that there were strong exciton-phonon interactions during exciton recombination,a reduced probability of non-radiative processes,and excellent thermal stability.It offers a promising strategy for improving the optical proper-ties of lead-free double perovskite NCs,and have the potential to replace traditional lead halide perovskite NCs in future optoelectronic applications.
NanocrystalsAlloyDouble perovskitesOptical propertiesExciton binding energy
Song Wang、Ying Xie、Wenchao Jiang、Binghang Liu、Keying Shi、Kai Pan
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Key Laboratory of Functional Inorganic Material Chemistry,Ministry of Education,Heilongjiang University,Harbin 150080,China
State Key Laboratory of Catalysis,Dalian National Laboratory for Clean Energy,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China
School of Materials Science and Engineering,Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications,Changzhou University,Changzhou 213164,China
国家自然科学基金黑龙江省自然科学基金Youth Science and Technology Innovation Team Project of Heilongjiang Province
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