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Micro-Raman combined photoluminescence detection device for micro LED chip and method thereof

A photoluminescence and micro-Raman technology, used in measurement devices, Raman scattering, fluorescence/phosphorescence, etc., can solve problems such as a substantial increase in frame rate, improve scanning speed, improve Raman scattering signal-to-noise ratio, The effect of improving test speed

Active Publication Date: 2020-07-24
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of multi-focus parallel imaging has not been used in confocal Raman spectroscopy instruments, and the frame rate of current commercial instruments needs to be greatly improved.

Method used

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  • Micro-Raman combined photoluminescence detection device for micro LED chip and method thereof
  • Micro-Raman combined photoluminescence detection device for micro LED chip and method thereof
  • Micro-Raman combined photoluminescence detection device for micro LED chip and method thereof

Examples

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Effect test

Embodiment 1

[0044] In this example, Stokes Raman was used in combination with fluorescence measurements. The general Raman test is aimed at the measurement of the vibrational Stokes peak, and the photon wavelength of the Raman scattering of the test sample is within 30nm higher than the wavelength of the incident light.

[0045] In this embodiment, the micro LED chip array is a 6-inch epitaxial wafer, and about 20 million LED chip units with a size of 20 μm are prepared. Set the scanning range of each frame to 400μm×400μm, then there are 20×20=400 LED chip units in one frame, and the single-point scanning frame rate is 10 frames per second. If one-dimensional laser dot matrix illumination is used, the excitation light If there are 20 spots, the frame rate will reach 200 frames per second. The number of LED chip units that can be measured in one second reaches 80,000, and in one hour it can reach 288 million. It can measure more than 14 pieces of 6-inch micro LED chip arrays, which is muc...

Embodiment 2

[0050] In this example, anti-Stokes Raman was used in combination with fluorescence measurements. The anti-Stokes Raman test is aimed at the measurement of the vibrational anti-Stokes peak, and the photon wavelength of the Raman scattering of the test sample is smaller than the wavelength of the excitation light. The intensity of anti-Stokes Raman scattering is an order of magnitude lower than that of Stokes Raman, but because the spectral range avoids the range of photoluminescence, the signal-to-noise ratio can be significantly improved.

[0051] In this embodiment, the micro LED chip array is a 6-inch epitaxial wafer, and about 20 million LED chip units with a size of 20 μm are prepared. Set the scanning range of each frame to 400μm×400μm, then there are 20×20=400 LED chip units in one frame, and the single-point scanning frame rate is 10 frames per second. If one-dimensional laser dot matrix illumination is used, the excitation light If there are 20 spots, the frame rate ...

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Abstract

The invention discloses a micro-Raman combined photoluminescence detection device for a micro LED chip and a method of the micro-Raman combined photoluminescence detection device. According to the micro-Raman combined photoluminescence detection device, a polygonal prism is combined with a CCD area array detector, and therefore a light spot array which is arranged in a one-dimensional mode is received by the CCD area array detector with a two-dimensional area array, the spectral distribution of each light spot is obtained, a complex laser frequency modulation and signal demodulation technologyis not required, the optical property and the electrical property can be obtained, and the scanning speed is greatly increased; the brewster angle incidence, double-cylindrical-surface lens beam shaping operation and a prism spectrometer are adopted to reduce a secondary peak stray spectrum caused by an optical grating, and therefore the suppression level of the stray spectrum can be remarkably improved; and photoluminescence detection and Raman detection are combined, the photoluminescence detection provides the luminescence wavelength and brightness information, the Raman detection gives out electrical properties, and the problem that the accuracy of the photoluminescence detection is low is solved.

Description

technical field [0001] The invention relates to the field of semiconductor devices, in particular to a micro-Raman combined photoluminescence detection device and a detection method for a micro LED chip. Background technique [0002] At present, the miniaturization trend of light-emitting diode (LED) chips is obvious. In the display field, the chip size of micro LED is reduced to less than 50 microns. Compared with LCD and OLED, it has obvious advantages in terms of brightness, resolution, energy consumption and response speed. Advantage. In order to ensure the production yield of micro LED chips, detection is a crucial link. Usually, the main parameters of LED chip detection include dominant wavelength, brightness, forward bias voltage, reverse leakage, short circuit and open circuit, etc. Photoluminescence (Photoluminescence; PL) scanning mapping (mapping) technology is a commonly used detection method. Photoluminescence detection can directly give the light-emitting wave...

Claims

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Application Information

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IPC IPC(8): G01N21/65G01N21/64
CPCG01N21/64G01N21/6402G01N21/645G01N21/6454G01N21/6458G01N21/6489G01N21/65G01N21/658G01N2021/6417G01N2021/6471G01N2021/6478G01N2021/6495G01N2021/655
Inventor 陈志忠潘祚坚焦飞张树霖康香宁陈怡帆詹景麟陈毅勇聂靖昕沈波
Owner PEKING UNIV
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