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A method for improving the bandwidth of LED visible light communication

A visible light and LED chip technology, applied in the field of visible light communication, can solve the problems of light emission rate limitation and restriction of visible light communication bandwidth, etc., and achieve the effects of fast light emission rate, accelerated visible light communication rate, and high quantum yield

Active Publication Date: 2020-01-07
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the response frequency of current commercial white LEDs is limited by the luminescence rate of phosphors based on rare earth luminescence, which restricts the bandwidth of visible light communication.

Method used

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  • A method for improving the bandwidth of LED visible light communication
  • A method for improving the bandwidth of LED visible light communication
  • A method for improving the bandwidth of LED visible light communication

Examples

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Embodiment 1

[0038] In this embodiment, a blue LED chip is used to assemble a yellow fluorescent material to compound a white LED, and the visible light communication test is carried out. This example uses an organic molecule 1,1,2,2-tetrakis(1,1′-biphenyl)-ethylene-4′,4″,4″ with aggregation induced emission (AIE) properties ', 4""-tetracarboxylic acid (4', 4", 4"', 4""-(ethene-1,1,2,2-tetrayl) tetrakis ([1,1'-biphenyl]-4-carboxylic acid)) as a ligand (hereinafter referred to as: H 4 TCBPE), with hexanuclear metal zirconium clusters (hereinafter referred to as: Zr 6 ) as the metal node, a metal organic layers (metal organic layers-MOL) compound (hereinafter referred to as: Zr-TCBPE-MOL) was synthesized. Zr-TCBPE-MOL has a 4,4-connected sql two-dimensional topological network structure. Zr-TCBPE-MOL has yellow fluorescence, and has a fluorescence spectrum similar to YAG-Ce, as well as a shorter fluorescence lifetime (t=2.6ns) and a high fluorescence quantum yield (Q=50%). In this embodi...

Embodiment 2

[0052] In this embodiment, an ultraviolet LED chip is used, and composite phosphors emitting blue and yellow fluorescence are assembled in a certain proportion on the surface of the ultraviolet LED chip to obtain a white LED, and a visible light communication test is performed. With 4,4'-(9,10-diphenylanthracene) dicarboxylic acid (H 2 DPA) synthesizes nano-metal organic frameworks (Metal Organic Frameworks-MOFs) Al-DPA as ligands and metal aluminum ions. Al-DPA is isomorphic to MIL-53(Al) which has been reported in the literature. The MOFs Al-DPA can emit blue fluorescence under the excitation of ultraviolet light, and has high quantum yield and short fluorescence lifetime. Since blue light and yellow light can be combined to obtain white light, this embodiment selects Rhodamine B (Rhodamine B for short Rh-B) with a high quantum yield as the yellow fluorescent chromophore to combine with blue light Al-DPA to obtain Rh- B@Al-DPA. Al-DPA is excited by ultraviolet light to em...

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Abstract

The invention discloses an LED visible light communication bandwidth improving method comprising the following steps: (1) one or more kinds of fluorescence molecules which are greater than 0.1ns-1 are assembled in a framework base material via a supermolecule assembling or channel loads, and illuminating composite material is formed; (2) the illuminating composite material and an LED chip are combined to form a white light LED used for visible light communication. According to the method disclosed in the invention, fluorescent powder material which is high in illuminating speed rate and great in quantum yield is made via synthesizing operation through a chemical approach, rare earth fluorescent powder currently used in conventional commercial LEDs is replaced, LED response frequency is improved, and an LED-based visible light communication speed rate can be enhanced.

Description

technical field [0001] The invention belongs to the technical field of visible light communication, and in particular relates to a method for improving the bandwidth of LED visible light communication. Background technique [0002] Visible Light Communication (Visible Light Communication-VLC) is an LED-based communication technology proposed in the early 21st century. VLC loads the data signal to the working circuit of the LED in the form of a voltage signal, controls the LED to increase or decrease the light emission at a specific frequency, and realizes signal transmission. [0003] Currently commercialized communication devices widely use communication technologies based on GHz radio waves (such as WiFi and Bluetooth), which can accommodate a limited number of non-interfering sub-channels under a fixed communication bandwidth. At the same time, the communication bandwidth of GHz radio waves is limited by its intrinsic frequency, which is difficult to further improve, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L33/50
CPCH01L33/501H01L2933/0041
Inventor 汪骋胡学福王子
Owner XIAMEN UNIV
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