Abstract
GaN/InGaN lighting-emitting diodes with different mesa structures are studied. The current-voltage characteristics, light output power, luminous efficiency, and peak wavelength of the GaN/InGaN lighting-emitting diodes with different mesa patterns are compared. It shows that the current-voltage characteristics of the chips with more mesa areas are im- proved greatly by reducing the current crowding. With higher injection current the light output powers of GaN-based LED with more mesa areas are enhanced. And the chips with more P-electrode area have a smaller red shift and a little bit blue shift due to the reduction of the current crowding.
Highlights
With small volume, light weight and long lifetime advantages, GaN-based LED has a wide range of applications, such as automobiles, backlighting, traffic lights, etc
This paper reports on the efficiency of GaN-Based LEDs with different mesa structures, here the mesa patterns have a better symmetry and some of them are more complicated, more results are presented
Strong built-in electric fields created polarization effects in InGaN/GaN multiple quantum well can tilt the band edges, which will produce quantum constrained Stark effects (QCSE) [19], and with the increment of the injection current, the free carriers in multiple quantum well (MQW) increase, the field induced by electrons and holes in the local states will screen the polarized field at a certain extent, and decrease the QCSE, which will overpass the red shift induced by the heat effect, so the peak position shifts to the short wavelength and the blue shift is observed
Summary
Light weight and long lifetime advantages, GaN-based LED has a wide range of applications, such as automobiles, backlighting, traffic lights, etc. These samples, such as current-voltage (V-I) characteristics, output power, luminous efficiency, peak and dominant wavelength, we obtain that the mesa area or the Pelectrode area is directly related to the performance of the chips. The chips with more mesa area have a better V-I characteristics, on the other hand, as the mesa area will prevent the light emission, the lightemitting efficiency will decrease a little bit smaller, the output power and luminous efficiency are either.
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