Visible light communication LED having a spiral inductance coil and a circle core and preparation method thereof

• US 10,237,933 B2
• Filed: 04/18/2017
• Issued: 03/19/2019
• Est. Priority Date: 10/11/2016
• Status: Active Grant

• Current Assignee: South China Normal University (Guangdong Education Department)
• Original Assignee: South China Normal University (Guangdong Education Department)
• Inventors: Sun, Huiqing, Yang, Xian, Guo, Zhiyou, Huang, Yong, Huang, Hongyong, Sun, Jie, Huang, Jing, Zhang, Zhuding, Liu, Yang
• Primary Examiner(s): Green, Telly
• Application Number:
  US15/490,065
• Publication Number:
  US 20180103516A1
• Time in Patent Office: 700 Days
• Field of Search: None
• CPC Class Codes: H01L 27/15 including semiconductor components having potential barriers, specially adapted for light emission
• CPC Class Codes: H01L 28/10 Inductors
• CPC Class Codes: H01L 2933/0016 relating to electrodes
• CPC Class Codes: H01L 33/007 comprising nitride compounds
• CPC Class Codes: H01L 33/0095 Post-treatment of devices, e.g. annealing, recrystallisation or short-circuit elimination
• CPC Class Codes: H01L 33/06 within the light emitting region, e.g. quantum confinement structure or tunnel barrier
• CPC Class Codes: H01L 33/08 with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body H01L27/15 takes precedence
• CPC Class Codes: H01L 33/12 with a stress relaxation structure, e.g. buffer layer
• CPC Class Codes: H01L 33/20 with a particular shape, e.g. curved or truncated substrate
• CPC Class Codes: H01L 33/32 containing nitrogen
• CPC Class Codes: H01L 33/38 with a particular shape
• CPC Class Codes: H01L 33/42 Transparent materials
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
• CPC Class Codes: H04B 10/116 Visible light communication
• CPC Class Codes: H04B 10/502 LED transmitters
• CPC Class Codes: H05B 45/40 Details of LED load circuits

Abstract

A visible light communication LED having a spiral inductance coil and a circular core is provided, comprising a sapphire substrate provided with a positive electrode welding spot and a negative electrode welding spot, and a plurality of LED cores deposited on the sapphire substrate. The negative electrode of a former core is connected with the positive electrode of a latter core, and the positive electrode of the first core and the negative electrode of the last core are respectively connected to the positive electrode welding spot and the negative electrode welding spot on the substrate. According to the present invention, each of the LED cores is surrounded by a spiral inductance coil, and a pin of one end of the spiral inductance coil is connected via a connecting wire with the negative electrode of an adjacent LED core, while the other end is directly connected with the positive electrode of the LED core that is surrounded by the spiral inductance coil.

Claims

1. A visible light communication LED, comprising

a sapphire substrate,

a plurality of LED cores deposited on the sapphire substrate and connected to each other in series, wherein each of the plurality of LED cores includes a negative electrode and a positive electrode, and

a plurality of spiral inductance coils disposed on the sapphire substrate, wherein each of the plurality of spiral inductance coils surrounds one of the plurality of LED cores and includes one end connected to the positive electrode of the one of the plurality of LED cores and another end connected to a negative electrode of the other one of the plurality of LED cores, which is next to the one of the plurality of LED cores.

2. The visible light communication LED according to claim 1, comprising sixteen LED cores which are configured to form a 4×

4 matrix.

3. The visible light communication LED according to claim 1, wherein the LED core comprises a GaN/InGaN epitaxial wafer, a transparent conductive layer is provided on a p-type layer of the epitaxial wafer, an annular positive electrode is provided on the transparent conductive layer, and the core is divided into an inner annular emission region, a middle annular emission region and an outer annular emission region by the annular positive electrode.

4. The visible light communication LED according to claim 3, wherein the GaN/InGaN epitaxial wafer comprises from its bottom to top a buffer layer, an n-type layer, a multiple quantum well layer, and a p-type layer.

5. The visible light communication LED according to claim 1, wherein the spiral inductance coil has an inductance value in a range of 20 nH-200 nH.

6. The visible light communication LED according to claim 1, wherein the spiral inductance coil has an outer diameter of 300 μ

m×

300 μ

m, an inner diameter of 170 μ

m×

170 μ

m, a line width of 5 μ

m, and a line distance of 10 μ

m.