Single-chip white light LED for visible light communication and preparation method therefor

Abstract

The invention discloses a single-chip white light LED for visible light communication. The LED comprises a substrate, a buffer layer, an n type semiconductor layer, a composite luminous region, a p type semiconductor layer, a transparent conductive layer, and a p electrode and an n electrode, wherein the buffer layer is formed on the upper surface of the substrate; the n type semiconductor layer is formed on the upper surface of the buffer layer; one side of the n type semiconductor layer is downwards to form a table surface; the depth of the table surface is less than the thickness of the n type semiconductor layer; the composite luminous region is formed on the upper surface, except the table surface, of the n type semiconductor layer; the p type semiconductor layer is formed on the upper surface of the composite luminous region; the transparent conducive layer is formed on the upper surface of the p type semiconductor layer; and the p electrode and the n electrode are formed on the table surfaces on one sides of the transparent conductive layer and the n type semiconductor layer respectively. The invention also provides a preparation method for the single-chip white light LED for the visible light communication. According to the invention, the single-chip white-light light source with high luminous efficiency and high bandwidth for the dual-waveband visible light communication can be obtained.

Description

technical field [0001] The invention belongs to the field of lighting sources, and relates to a single-chip white light LED for visible light communication and a preparation method thereof, in particular to a surface plasmon-enhanced white light LED for visible light communication with high light efficiency and high bandwidth and a preparation method thereof. Background technique [0002] White LEDs are energy-saving, environmentally friendly, and have a reliable lifespan. By loading high-speed modulation signals that cannot be sensed by the human eye to transmit data, they can realize the function of visible light wireless communication while taking into account lighting. However, the frequency response of the LED also directly determines the modulation bandwidth and transmission speed of the visible light communication system. [0003] At present, blue light chips and yellow rare earth phosphors are widely used to obtain white LEDs. Limited by the response speed of phospho...

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Problems solved by technology

[0004] A single-chip white light LED can be obtained by cascading blue and yellow light quantum wells, but its disadvantages are that the yellow light is very weak and the quantum well region has a large strain and it is difficult to obtain a high internal quantum efficiency. Therefore, the current white light color of the device and Luminous efficiency is not good

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