期刊
ADVANCED SCIENCE
卷 9, 期 7, 页码 -出版社
WILEY
DOI: 10.1002/advs.202103724
关键词
Cu+ doping; double perovskite; excited-state dynamics; photoluminescence; self-trapped exciton
资金
- NSFC [U1805252, 11774345, 12074379, 21771178, 11904365, 12004384]
- China Postdoctoral Science Foundation [2019M652266, 2020M682100]
- CAS/SAFEA International Partnership Program for Creative Research Teams
This study reports a unique strategy to achieve efficient self-trapped exciton (STE) emission in alloyed lead-free Cs-2(Ag/Na)InCl6 double perovskites through Cu+ doping. A small amount of Cu+ doping enhances the STE emission in the crystals, and the underlying mechanism is investigated by temperature-dependent photoluminescence and femtosecond transient absorption spectroscopy.
Fundamental understanding of the effect of doping on the optical properties of 3D double perovskites (DPs) especially the dynamics of self-trapped excitons (STEs) is of vital importance for their optoelectronic applications. Herein, a unique strategy via Cu+ doping to achieve efficient STE emission in the alloyed lead-free Cs-2(Ag/Na)InCl6 DPs is reported. A small amount (1.0 mol%) of Cu+ doping results in boosted STE emission in the crystals, with photoluminescence (PL) quantum yield increasing from 19.0% to 62.6% and excitation band shifting from 310 to 365 nm. Temperature-dependent PL and femtosecond transient absorption spectroscopies reveal that the remarkable PL enhancement originates from the increased radiative recombination rate and density of STEs, as a result of symmetry breakdown of the STE wavefunction at the octahedral Ag+ site. These findings provide deep insights into the STE dynamics in Cu+-doped Cs-2(Ag/Na)InCl6, thereby laying a foundation for the future design of new lead-free DPs with efficient STE emission.
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