Near-infrared-triggered photon upconversion tuning in all-inorganic cesium lead halide perovskite quantum dots

Wei Zheng, Ping Huang, Zhongliang Gong, Datao Tu, Jin Xu, Qilin Zou, Renfu Li, Wenwu You, Jean-Claude G. Bünzli and Xueyuan Chen ()
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Wei Zheng: Chinese Academy of Sciences
Ping Huang: Chinese Academy of Sciences
Zhongliang Gong: Chinese Academy of Sciences
Datao Tu: Chinese Academy of Sciences
Jin Xu: Chinese Academy of Sciences
Qilin Zou: Chinese Academy of Sciences
Renfu Li: Chinese Academy of Sciences
Wenwu You: Chinese Academy of Sciences
Jean-Claude G. Bünzli: Lausanne (EPFL)
Xueyuan Chen: Chinese Academy of Sciences

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract All-inorganic CsPbX3 (X = Cl, Br, and I) perovskite quantum dots (PeQDs) have shown great promise in optoelectronics and photovoltaics owing to their outstanding linear optical properties; however, nonlinear upconversion is limited by the small cross-section of multiphoton absorption, necessitating high power density excitation. Herein, we report a convenient and versatile strategy to fine tuning the upconversion luminescence in CsPbX3 PeQDs through sensitization by lanthanide-doped nanoparticles. Full-color emission with wavelengths beyond the availability of lanthanides is achieved through tailoring of the PeQDs bandgap, in parallel with the inherent high conversion efficiency of energy transfer upconversion under low power density excitation. Importantly, the luminescent lifetimes of the excitons can be enormously lengthened from the intrinsic nanosecond scale to milliseconds depending on the lifetimes of lanthanide ions. These findings provide a general approach to stimulate photon upconversion in PeQDs, thereby opening up a new avenue for exploring novel and versatile applications of PeQDs.

Date: 2018
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DOI: 10.1038/s41467-018-05947-2

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