研究目的
Investigating the spontaneous emission quantum efficiency of commercial LED materials at high temperatures for future applications in high-density power electronic modules.
研究成果
The study demonstrates that commercial LED materials exhibit relatively high spontaneous emission quantum efficiencies at elevated temperatures, making them suitable for high-temperature optoelectronic applications. The findings support the potential use of these materials in improving high-temperature optocouplers for power electronic modules.
研究不足
The study is limited by the upper limit of the current laser source, which restricts the maximum excitation power that can be used at high temperatures. Additionally, the photon recycling factor was assumed to be independent of laser injection levels, which may not hold true under all conditions.
1：Experimental Design and Method Selection:
The study utilized photoluminescence (PL) spectroscopy to evaluate the spontaneous emission quantum efficiency (QE) of commercial LED materials at temperatures ranging from 77 K to 800 K. The ABC model was employed to calculate the QE.
2：Sample Selection and Data Sources:
Four types of commercial LED materials were studied: blue for display (sample A1), blue for lighting (sample A2), green for display (sample B), and red for display (sample C).
3：List of Experimental Equipment and Materials:
A continuous-wave (CW) laser with an operational wavelength of 395 nm was used for blue and green LED materials, and a CW laser operated at 532 nm was used for the red LED material.
4：Experimental Procedures and Operational Workflow:
Temperature- and power-dependent PL measurements were performed with the laser power varied over a wide range. The PL signals were analyzed to determine the QE.
5：Data Analysis Methods:
The ABC model was used to fit the experimental data and calculate the spontaneous emission QE.
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