GaN-based light-emitting diode and preparation method thereof

Abstract

The invention discloses a GaN-based light-emitting diode which comprises a substrate, a buffer layer, an N-type layer, a multiple quantum well active layer and a P-type layer, wherein the multiple quantum well active layer consists of InGaN quantum wells and InAlN quantum barriers. In the GaN-based light-emitting diode, InAlN materials in lattice matching with InGaN quantum well materials serve as the quantum barriers, so that a QCSE (Quantum-Confined Stark Effect) is improved, Efficiency Droop of a device is improved, the light-emitting efficiency of the device is improved, and IQE (Internal Quantum Efficiency) of an LED (Light-Emitting Diode) assembly is improved.

Description

Technical field [0001] The invention relates to the field of preparation of semiconductor optoelectronic devices, in particular to a gallium nitride-based light-emitting diode and a preparation method thereof. Background technique [0002] The advantages of light-emitting diodes (LEDs) in terms of energy saving, environmental protection and long life have attracted widespread attention. Especially LEDs based on gallium nitride materials, because their wavelength range theoretically covers the entire visible light band and ultraviolet band, it has become the mainstream direction of current LED development. GaN material blue LED technology has made progress in both research and commercial production applications, and its application fields are broad. However, the current LED luminous efficiency is relatively low. From the perspective of the epitaxial structure, further improving the electron hole injection efficiency and recombination efficiency in the LED active layer requires im...

AI Technical Summary

Problems solved by technology

However, the luminous efficiency of LED is relatively low at present. From the perspective of epitaxial structure, further improving the electron hole injection efficiency and recombination efficiency in the active layer of LED needs to improve the internal quantum efficiency (IQE: Internal Quantum Efficiency)

[0003] The traditional multi-quantum well active layer is composed of GaN quantum barriers and InGaN quantum well structures. However, due to the lattice mismatch between GaN and InGaN materials, the polarization effect occurs, causing the conduction band and the valence band to be discontinuous, resulting in a light-emitting device. The phenomenon that the internal quantum efficiency declines with the increase of the applied current density intensifies, resulting in Efficiency Droop, which affects the quality and application range of the device

[0004] In addition, in the traditional multi-quantum well active layer structure, there is a large temperature difference between the well and the barrier, and there is a long heating and cooling time during the growth process, which has a certain impact on the entire process time, which is not conducive to the improvement of production capacity.

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