研究目的
Evaluating commercial gallium-nitride-based blue light-emitting diodes (LEDs) at high temperatures (up to 700 K) for possible integration as an optocoupler emitter in high-density power electronic modules.
研究成果
The temperature and injected current dependent IQE of the commercial InGaN/GaN MQW blue LED are studied for temperatures up to 700 K. The sample exhibits a peak IQE of 58.50% at 700 K when it operates at a current density of 2 A/cm2. It is also noted that the variation in IQE and EQE with temperature is reduced at higher injection current densities. An optimized injection level for the LEDs to achieve minimum variation in IQE with temperature can be calculated using the presented method.
研究不足
The LEDs were characterized up to 700 K due to the limitation of experiment setup to accurately capture enough EL data points at higher temperatures for IQE extraction.
1：Experimental Design and Method Selection:
High-temperature optical and electrical studies were conducted on vertically-structured bare die blue LEDs. The temperature- and injection-current-dependent internal quantum efficiency and current-voltage characteristics of the blue LEDs are studied using the ABC model.
2：Sample Selection and Data Sources:
Commercial InGaN/GaN MQW blue LEDs manufactured by Cree Inc. were selected.
3：List of Experimental Equipment and Materials:
A Horiba 550 spectrometer integrated with a photomultiplier tube (PMT) and a Janis ST-100H cryostat is used for temperature- and intensity-dependent electroluminescence (T-IDEL) measurements. Keithley 2450 source measurement unit (SMU) is used to measure the current-voltage (I-V) characteristics of the LEDs.
4：Experimental Procedures and Operational Workflow:
The LEDs were characterized up to 700 K. The IQE is calculated based on the power-law relationship between the injection current and the light output power from the T-IDEL measurements.
5：Data Analysis Methods:
The IQE is extracted using the ABC model from the integrated electroluminescence (EL) intensity at different temperatures.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
