研究目的
Investigating the feasibility of reducing lead content in two-dimensional perovskites by substituting lead with non-toxic tin for the preparation of light-emitting diodes (LEDs) with different tin-lead ratios.
研究成果
The study demonstrates the feasibility of manufacturing visible lead-free PeLEDs by substituting lead with tin. However, the performance of these devices, in terms of stability and EQE, is currently inferior to lead-based PeLEDs, indicating the need for further optimization of process and interface engineering.
研究不足
The study highlights the challenges in improving the stability and external quantum efficiency (EQE) of lead-free PeLEDs. The introduction of tin into the perovskite structure increases crystal lattice disorder, leading to more defects and faster non-radiative recombination rates.
1：Experimental Design and Method Selection:
The study involves the synthesis of two-dimensional mixed lead-tin halide perovskites and their application in LEDs. The methodology includes the preparation of perovskite thin films and the fabrication of LED devices.
2：Sample Selection and Data Sources:
Samples include (PEA)2PbxSn1-xI4-based perovskite thin films with varying tin-lead ratios. Data sources include photoluminescence spectra and electroluminescence measurements.
3：List of Experimental Equipment and Materials:
Materials include PEAI, SnI2, PbI2, DMSO, DMF, Poly-TPD, TPBi, LiF, and Al. Equipment includes spin-coating apparatus, thermal evaporation system, and spectrometers.
4：Experimental Procedures and Operational Workflow:
The process involves the synthesis of perovskite precursor solutions, spin-coating of perovskite films, fabrication of LED devices, and characterization of their optical and electrical properties.
5：Data Analysis Methods:
Analysis includes measuring current density-voltage-luminance characteristics and electroluminescence spectra to evaluate device performance.
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