研究目的
Investigating the size effects on optical performance of blue light-emitting diodes (LEDs) and studying the essential physical mechanism by fabricating LEDs with various sizes of the active area and testing optical characteristics.
研究成果
Micro-LEDs exhibit better thermal dissipation and light extract efficiency compared to broad-area LEDs. They also show more stable wavelength under low PWM current density, making them beneficial for displays.
研究不足
The study focuses on blue LEDs and may not be directly applicable to other colors. The effects of surface recombination and thermal dissipation are highlighted, but other factors may also influence performance.
1：Experimental Design and Method Selection:
Fabrication of InGaN LED chips with seven different sizes on the same epilayer structure to investigate size effects.
2：Sample Selection and Data Sources:
LEDs with square active areas ranging from 20 to 120 μm.
3：List of Experimental Equipment and Materials:
LED310 and Agilent 33220A used as DC and PWM power, respectively; integrating sphere and HAAS-2000 for optical performance testing.
4：Experimental Procedures and Operational Workflow:
Fabrication involved photolithography, ICP etching, PECVD for SiO2 passivation, and electron-beam evaporation for metal layers.
5：Data Analysis Methods:
Analysis of external quantum efficiency, peak wavelength, FWHM, and other optical characteristics under DC and PWM.
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