Optimization of P/N discontinuous ohmic contact LED

Abstract

To further improve the performance of the LED and seek a better electrode structure of LED, this paper designs and prepares a variety of devices with different electrode window sizes and spacings based on the P/N electrode discontinuous ohmic contact LED. By comparing the influence of different electrode window sizes and spacings on the photoelectric performance of LED under 5-500mA driving current, the best performance electrode window size and spacing are obtained. The test results in this paper show that when the N electrode window spacing is reduced from 45µm to 37µm, the device voltage decreases, and the spectral area increases. When the size of the N electrode window is reduced from 5µm×17µm to 5µm×10µm, although the voltage of the device has increased, the luminous efficiency under the rated current of 150mA is increased by 4.9%. When the distance between the P electrode windows is increased from 20µm to 30µm, the voltage of the device will increase, but the luminous efficiency under the test current of 150mA is increased by 7.2%. Although the size of the P electrode window has little effect on the light-emitting performance of the device, increasing the size of the P electrode window to a certain extent can improve the electrical characteristics of the device. The best structure obtained in this paper to improve the light-emitting performance of the device is: the size of the N electrode window is 5µm×10µm, and the spacing is 37µm; the size of the P electrode window is 15µm×5µm, and the spacing is 30µm.