研究目的
Investigating the efficient and stable emission of warm-white light from lead-free halide double perovskites via self-trapped excitons.
研究成果
The study demonstrates that Na alloying into Cs2AgInCl6 breaks the parity-forbidden transition and reduces its electronic dimensionality, leading to efficient white emission via radiative recombination of STEs. This material shows outstanding stability and low-cost manufacture, indicating promise for solid-state lighting.
研究不足
The study is limited by the need for further optimization of emitting-layer quality and device configuration to increase electroluminescence performance. Additionally, the reliance on specific doping concentrations for optimal performance may limit broader applicability.
1：Experimental Design and Method Selection:
The study focused on the double perovskite Cs2AgInCl6, utilizing first-principles density-functional-theory and many-body perturbation-theory calculations to understand the origins of broadband emission.
2：Sample Selection and Data Sources:
Cs2AgInCl6 was synthesized with sodium cations alloyed into it to break the dark transition.
3：List of Experimental Equipment and Materials:
Materials included CsCl, NaCl, AgCl, InCl3, and BiCl3, with characterization performed using XRD, ICP-OES, and photoluminescence measurements.
4：Experimental Procedures and Operational Workflow:
The synthesis involved mixing precursors in an HCl solution in a hydrothermal autoclave, followed by heating and slow cooling.
5：Data Analysis Methods:
Data analysis included GW-BSE calculations for understanding electronic properties and photoluminescence spectra analysis.
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Amplified Yb:KGW laser
Pharos
Light Conversion
Transient-absorption measurement
-
ICP-OES spectrometer
Optima 7300DV
Perkin Elmer
Composition determination
-
Thermal gravimetric analyzer
Diamond TG/DTA6300
PerkinElmer
Thermal stability analysis
-
Scanning electron microscope
Nova NanoSEM450
FEI
Film characterization
-
Transmission electron microscope
2100F
JEOL
Material characterization
-
Absolute photoluminescence measurement system
Quantaurus-QY
Hamamatsu
PLQY measurement
-
Keithley source meter
2400
Keithley
Device performance measurement
-
Ultraviolet–visible spectrophotometer
Lambda 950
PerkinElmer Instruments
Absorption and reflectance spectra measurement
-
Photoluminescence spectrometer
UC920
Edinburgh Instruments Ltd
Photoluminescence and PLE measurements
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CsCl
Sigma Aldrich
Precursor for synthesis
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AgCl
Sigma Aldrich
Precursor for synthesis
-
NaCl
Sigma Aldrich
Precursor for synthesis
-
InCl3
Sigma Aldrich
Precursor for synthesis
-
BiCl3
Sigma Aldrich
Doping agent
-
X-ray diffractometer
Philips X’pert pro MRD
Philips
Material characterization
-
Raman spectrometer
LabRAM HR800
Horiba Jobin Yvon
Temperature-dependent photoluminescence spectra measurement
-
Time-correlated single-photon counter
Photoluminescence lifetime measurement
-
Ultraviolet photoemission spectrometer
UVLS
Specs
Film characterization
-
Photometer
SpectraScan PR655
Photo Research
Emission spectra and intensity recording
-
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