研究目的
Investigating the highly efficient Mn doped CsPb(Cl/Br)3 quantum dots for white light-emitting diodes.
研究成果
Efficient exciton-to-Mn energy transfer was achieved in the CsPb/Mn(Cl/Br)3 QDs by using the AESE strategy. The orange emission can be well tuned by the Mn content and the mode of adding Cs4PbBr6. By applying the DBD method, the intensity of Mn emission can be maintained and the surface traps are removed by the surface reconstruction while replacing Cl with Br. Due to the efficient energy transfer from exciton to Mn, the stable white emission with PLQY of 94% is obtained successfully. Furthermore, this highly efficient CsPb/Mn(Cl/Br)3 QDs are employed to prepare a WLED prototype, which indicates a great potential in solid state lighting application.
研究不足
The Mn doped perovskite QD solution is not stable under the ambient environment because the 0D perovskite can convert to 3D perovskite under moisture. However, they are very stable under nitrogen environment.
1：Experimental Design and Method Selection:
The study involved the synthesis of Mn doped CsPb(Cl/Br)3 QDs and Cs4PbBr6 QDs via hot injection method and anion exchange surface engineering (AESE) strategy.
2：Sample Selection and Data Sources:
The samples were characterized using UV-vis absorption spectra, fluorescence emission spectra, X-ray diffraction (XRD), transmission electron microscope (TEM), and time-resolved photoluminescence (TRPL).
3：List of Experimental Equipment and Materials:
Equipment included a Shimadzu UV-2550 spectrophotometer, Ocean Optics spectrometer, Bruker D8 Advance X-ray diffractometer, FEI Tecnai G2 Spirit TWIN transmission electron microscope, and a fluorescence spectrometer (FLS920P, Edinburgh Instruments). Materials included Cs2CO3, PbCl2, MnCl2, oleic acid (OA), oleylamine (OLA), and octadecene (ODE).
4：Experimental Procedures and Operational Workflow:
The synthesis involved drying under vacuum, heating under N2 atmosphere, injection of precursors, centrifugation, and dispersion in toluene. The anion exchange reaction was conducted by mixing CsPb/MnCl3 QDs with Cs4PbBr6 QDs in toluene.
5：Data Analysis Methods:
The PLQYs were measured using a fluorescence spectrometer equipped with an integrating sphere. TRPL measurements were performed using a time-correlated single-photon counting (TCSPC) lifetime spectroscopy system.
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FLS920P fluorescence spectrometer
FLS920P
Edinburgh Instruments
Absolute PL QYs measurement
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UV-2550 spectrophotometer
UV-2550
Shimadzu
Absorbance spectra measurement
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D8 Advance X-ray diffractometer
D8 Advance
Bruker
X-ray diffraction (XRD) patterns measurement
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Tecnai G2 Spirit TWIN transmission electron microscope
Tecnai G2 Spirit TWIN
FEI
Morphology measurement of the QDs
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Ocean Optics spectrometer
Ocean Optics
Fluorescence emission spectra measurement
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EPL-380 nm picosecond pulsed diode laser
EPL-380 nm
Time-resolved PL lifetime measurements
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