| Outline of Annual Research Achievements |
In this work, by taking advantage of the strong solvent ability of trioctylphosphine oxide (TOPO) for both SnX2 and PbX2 halide salts, we present the first synthesis of pure halogen-based prototype ASnxPb(1-x)X3 (A = Cs, FA, MA; X = Cl, Br, I) QDs, which exhibit distinctive structural and physicochemical features that can be facilely controlled by varying halide species and Sn/Pb ratios. Further, through incorporation of Na+, we have realized for the first time efficient near-infrared emission from Sn-Pb alloyed perovskite QDs with substantially improved PL QY from about 0.3% to 28%. Our findings provide new insights into the materials design strategies for improved optoelectronic properties of Sn-containing perovskites.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
The proposed study has been finished very successfully and some new findings have been obtained. The above works have been published in Chemistry of Materials as Front Paper (F. Liu, Y. Zhang, C. Ding, K. Kawabata, Y. Yoshihara, T. Toyoda, S. Hayase, T. Minemoto, R. Wang, Q. Shen, Trioctylphosphine oxide acts as alkahest for SnX2/PbX2: A gneral synthetic route to perovskite ASnxPb(1-x)X3 (A = Cs, FA, MA; X = Cl, Br, I) quantum dots, Chem. Mater., Vol. 32, No. 3, pp. 1089-1100, 2020) and in Angewandte Chemie International Edition (F. Liu, J. Jiang, Y. Zhang, C. Ding, T. Toyoda, S. Hayase, R. Wang, S. Tao, Q Shen, Near-infrared emission from tin-lead (Sn-Pb) alloyed perovskite quantum dots by sodium doping, Angew. Chem. Int. Ed., Vol. 59, pp. 1-5, 2020). In addition, one patent has been applied.
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| Strategy for Future Research Activity |
Synthesis of core-shell ASnX3-APbX3 QDs with different Sn/Pb ratios and halide compositions will be carried out. Characterize the basic properties including light absorption, photoluminescence, crystal structure, particle morphology, chemical valence state, Stokes shift, band structure, and Urbach energy, etc., of these compounds using UV-vis absorption, XRD, SEM, TEM, FTIR, EDS, TRIR, UPS, and XPS measurements, etc. Optimize the crystal quality of the QDs by tuning synthesis temperature, time, and reaction precursors, etc.
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