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A kind of patterned led substrate and led chip of tower pattern

A graphic and patterned technology, applied in electrical components, circuits, semiconductor devices, etc., to achieve a wide range of application prospects, and the effect of improving light intensity and light extraction efficiency

Active Publication Date: 2017-06-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this can improve the light output rate to a certain extent, with the advancement of technology and the continuous improvement of people's requirements for lighting tools, they can no longer fully meet people's needs.

Method used

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  • A kind of patterned led substrate and led chip of tower pattern
  • A kind of patterned led substrate and led chip of tower pattern
  • A kind of patterned led substrate and led chip of tower pattern

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] figure 1 It is a schematic diagram of the LED chip of this embodiment, which consists of a patterned LED substrate 11 with a sapphire tower pattern, an N-type GaN layer 12, an MQW quantum well layer 13, and a P-type GaN layer 14 arranged in sequence.

[0033] In the patterned LED substrate with a tower pattern in this embodiment, the substrate pattern is composed of a plurality of tower patterns with the same shape arranged on the surface of the substrate. Such as figure 2 As shown, the tower pattern is an integral structure composed of two concave circular frustums and a cone; the three concave circular frustums are arranged in order from large to small from bottom to top. Wherein, the top of the i-th concavity-shaped circular platform is provided with an i-th cylindrical concavity; i=1, 2, 3. Let the i-th circular platform corresponding to the i-th circular platform be the i-th circular platform; let the cylinder corresponding to the i-th cylindrical concave be the...

Embodiment 2

[0037] In this embodiment, except the following features, all the other features are the same as in Embodiment 1:

[0038] In this embodiment, the height H of the tower pattern is 2 μm, and the radius R of the bottom circle is 2.0 μm. The height h of the first cylinder 1 is 0.4μm, the height h of the second cylinder 2 is 0.8μm; the height h of the third cylinder 3 is 1.5 μm.

[0039] The tower pattern used in this implementation is as follows Figure 4 In the rectangular arrangement shown, the distance D between the centers of adjacent tower patterns is 8 μm.

Embodiment 3

[0041] In this embodiment, except the following features, all the other features are the same as in Embodiment 1:

[0042] In this embodiment, the height H of the tower pattern is 2 μm, and the radius R of the bottom circle is 1.5 μm. The height h of the first cylinder 1 is 0.3μm, the height h of the second cylinder 2 is 0.6μm; the height h of the third cylinder 3 is 1.3 μm.

[0043] The tower pattern used in this implementation is as follows Figure 5 In the rhombus arrangement shown, the distance D between the centers of adjacent tower patterns is 6 μm.

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Abstract

The invention discloses a graphical LED substrate with tower-shaped patterns. A substrate pattern comprises the plurality of tower-shaped patterns which are same in shape and arranged on the surface of the substrate, wherein each tower-shaped pattern adopts an integrated structure comprising m circular truncated cones with inwards recessed parts and a cone; the m circular truncated cones with the inwards recessed parts are arranged in sequence from bottom to top from large to small; an ith cylindrical inwards recessed part is formed in the top of the ith circular truncated cone with the inwards recessed part; the circular truncated cone corresponding to the ith circular truncated cone with the inwards recessed part is set as the ith circular truncated cone; a cylinder corresponding to the ith cylindrical inwards recessed part is set as an ith cylinder; the upper bottom surface of the ith circular truncated cone is that of the ith cylinder; the lower bottom surface of the ith cylinder is that of the (i+1)th circular truncated cone; the lower bottom surface of an mth cylinder is the bottom surface of the cone; the height h[i] of the ith cylinder is more than 0. According to the graphical LED substrate, the refraction and reflection surfaces are added, the light intensity and the luminous efficiency are improved in different degrees in comparison with a general conical graphical substrate with the same size, and the application prospect is wide.

Description

technical field [0001] The invention relates to a patterned LED substrate, in particular to a patterned LED substrate with a tower pattern and an LED chip. Background technique [0002] At present, in order to improve the internal quantum efficiency and light extraction efficiency of GaN-based LEDs, many new technologies have been applied, including lateral epitaxial growth technology, surface roughening, patterned substrate technology, and metal specular reflection layer technology. In recent years, how to use patterned substrate technology to effectively improve the light extraction efficiency of GaN-based LEDs on sapphire substrates has gradually become a research hotspot in the field of GaN-based LEDs on sapphire substrates. As the key to patterned substrate technology, the substrate pattern has evolved so far, which has significantly improved the LED light extraction effect and epitaxy quality, and has become an important way to improve LED performance. [0003] The im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L33/22H01L33/10H01L33/02H01L33/58
CPCH01L33/02H01L33/10H01L33/22H01L33/58
Inventor 李国强乔田林志霆王海燕周仕忠王凯诚钟立义
Owner SOUTH CHINA UNIV OF TECH