Preparation method for improving luminous efficiency of LED packaging device by using amorphous photonic structure

A technology of LED encapsulation and photonic structure, which is applied in the direction of photomechanical equipment, semiconductor devices, and photoplate-making process of pattern surface, etc. It can solve the problems that it is difficult to increase the light extraction efficiency, and achieve significant light extraction efficiency, high improvement, and improved The effect of light extraction efficiency

Active Publication Date: 2021-10-08
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for AAO structures with a characteristic size (CD) greater than half a wavelength to several wavelengths of light, the above theory is difficult to give an accurate expectation of enhanced light extraction efficiency.
The AAO Fourier spatial frequency distribution theory has been used in the study of amorphous photonic structural color, but there are few reports on the improvement of AAO light extraction efficiency.

Method used

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  • Preparation method for improving luminous efficiency of LED packaging device by using amorphous photonic structure
  • Preparation method for improving luminous efficiency of LED packaging device by using amorphous photonic structure
  • Preparation method for improving luminous efficiency of LED packaging device by using amorphous photonic structure

Examples

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Embodiment 1

[0103] In this embodiment, a GaN-based blue LED packaging device with a small curvature surface of an AAO pattern is prepared, and the pattern on the hard template is an array of holes.

[0104] The preparation method for improving the light extraction efficiency of LED packaging devices by using an amorphous photonic structure in this embodiment includes the following steps:

[0105] 1) Preparation of AAO template with amorphous photonic structure with AAO pattern by secondary anodic oxidation method:

[0106] a) After the high-purity aluminum sheet is electrochemically polished, the aluminum sheet is used as an anode and immersed in a constant temperature 0.005-0.5mol / L phosphoric acid electrolyte for an anodic oxidation reaction. Self-assembled nanopore arrays;

[0107] b) immersing the aluminum sheet after an anodic oxidation reaction in a constant temperature deoxidation layer solution to remove the oxide layer on the surface of the aluminum sheet, leaving an array of na...

Embodiment 2

[0124] In this embodiment, a GaN-based blue LED packaging device with a large curvature surface of an AAO pattern is prepared, and the pattern on the hard template is an array of holes.

[0125] The preparation method for improving the light extraction efficiency of LED packaging devices by using an amorphous photonic structure in this embodiment includes the following steps:

[0126] 1) Preparation of AAO template with amorphous photonic structure with AAO pattern by secondary anodic oxidation method:

[0127] a) After the high-purity aluminum sheet is electrochemically polished, the aluminum sheet is used as an anode and immersed in a constant temperature 0.005-0.5mol / L phosphoric acid electrolyte for an anodic oxidation reaction. Self-assembled nanopore arrays;

[0128] b) immersing the aluminum sheet after an anodic oxidation reaction in a constant temperature deoxidation layer solution to remove the oxide layer on the surface of the aluminum sheet, leaving an array of na...

Embodiment 3

[0142] In this embodiment, a white light LED packaging device with a large curvature surface of an AAO pattern is prepared, and the pattern on the hard template is a pillar array.

[0143] The preparation method for improving the light extraction efficiency of LED packaging devices by using an amorphous photonic structure in this embodiment includes the following steps:

[0144] 1) Preparation of AAO template with amorphous photonic structure with AAO pattern by secondary anodic oxidation method:

[0145] a) After the high-purity aluminum sheet is electrochemically polished, the aluminum sheet is used as an anode and immersed in a constant temperature phosphoric acid electrolyte to perform an anodic oxidation reaction to produce a preliminary self-assembled nanopore array;

[0146] b) immersing the aluminum sheet after an anodic oxidation reaction in a constant temperature deoxidation layer solution to remove the oxide layer on the surface of the aluminum sheet, leaving an arr...

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Abstract

The invention discloses a preparation method for improving the luminous efficiency of an LED packaging device by using an amorphous photonic structure. Fourier transform theory design is utilized, the amorphous photon structure can accurately act with photons with related wavelengths, transmission of light larger than a total reflection angle is effectively improved, and compared with a photonic crystal structure, the amorphous photon structure has the advantages that the luminous efficiency is improved more greatly, and the luminous efficiency of a white light LED is increased remarkably; the AAO template is adopted to prepare the amorphous photonic structure, the process is simple, and the cost is low; by changing the electrolyte type, the electrolysis voltage, the temperature, the reaming time and the like, an aperiodic hole array which has different average hole pitches and hole diameters and meets the characteristics of an amorphous photon structure can be obtained, so as to be matched with the light emitting wavelength of an LED chip; meanwhile, copyright and reverse AAO hard templates are prepared by using an imprinting process and an etching process; the process is simple and feasible, and the transfer cost is low.

Description

technical field [0001] The invention relates to the technical field of optoelectronic devices, in particular to a preparation method for improving the light extraction efficiency of an LED packaging device by using an amorphous photonic structure. Background technique [0002] Semiconductor light-emitting diodes (LEDs), as low-cost, high-efficiency, and high-brightness solid-state light sources, have been widely used in various fields, such as lighting, display, medical treatment, and communication. Since the high refractive index of the LED material will cause total reflection at the interface between the LED material and the air, the light extraction efficiency of the bare LED chip is very low, so that the external quantum efficiency of the LED is not high. Therefore, people have proposed many methods to improve the light extraction efficiency of LEDs, mainly colloidal packaging of LED chips or changing the shape of LED chips; introducing micro-nano structures, such as pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/50H01L33/54H01L33/60G03F7/00B82Y20/00
CPCH01L33/54H01L33/60H01L33/505B82Y20/00G03F7/0002H01L2933/005H01L2933/0041H01L2933/0058
Inventor 陈志忠陈毅勇詹景麟聂靖昕潘祚坚邓楚涵席鑫康香宁焦飞沈波
Owner PEKING UNIV
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