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Method for measuring absolute photoluminescence quantum efficiency related to excitation light intensity

A quantum efficiency and photoluminescence technology, which is applied in fluorescence/phosphorescence, material excitation analysis, etc., can solve the problems of increased test time, inability to accurately measure absolute photoluminescence quantum efficiency, and inability to detect extremely weak luminescent signals of samples

Active Publication Date: 2020-11-24
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] On this basis, using the existing technology to measure the absolute PLQE under different excitation intensities is also subject to many limitations: 1) In order to ensure the accuracy of the test, the integrating sphere detection system used in the current technology needs to acquire multiple spectra under a single light intensity, Then changing the light intensity and repeating the test will greatly increase the test time; 2) Low test efficiency is extremely unfavorable for materials with poor air stability and light stability, which will easily cause inaccurate test results; 3) Limited by the noise of the spectrometer , coupled with the homogenization effect of the integrating sphere, this method cannot detect the extremely weak luminescence signal of the sample. The PLQE corresponding to this signal is extremely important and can reflect the defect state characteristics of the sample, so the absolute photoluminescence quantum efficiency related to the excitation light intensity cannot be determined. Take accurate measurements

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  • Method for measuring absolute photoluminescence quantum efficiency related to excitation light intensity
  • Method for measuring absolute photoluminescence quantum efficiency related to excitation light intensity
  • Method for measuring absolute photoluminescence quantum efficiency related to excitation light intensity

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Embodiment 1

[0048] A method for measuring the absolute photoluminescence quantum efficiency related to excitation light intensity, which is obtained by mutual calibration between the absolute photoluminescence quantum efficiency of a sample at a single fixed excitation intensity and the relative photoluminescence quantum efficiency under different excitation intensities. Therefore, the method is divided into the following steps 1 to 3 for testing:

[0049] Step 1: Absolute photoluminescence quantum efficiency measurement with a single fixed excitation intensity

[0050] The test is realized based on the integrating sphere detection system, refer to figure 1 , including laser 1, chopper 2, movable mirror 3, integrating sphere 4, optical fiber 5, spectrometer 6 and computer 7. Such as figure 1 As shown, the laser 1 enters the integrating sphere 4 as an excitation light source through the reflector 3, the solid line beam indicates that the excitation light directly hits the sample 8, and t...

Embodiment 2

[0073] In the present invention, image 3 The position of the chopper 2 in the phase-locked detection system is not limited to the position of the light outlet of the laser 1, it can be located anywhere in the optical path between the laser 1 and the sample 8, such as Figure 5 shown.

Embodiment 3

[0075] In the present invention, image 3 The position of the chopper 2 in the phase-locked detection system is not limited to the position of the light outlet of the laser 1, it can be located anywhere in the optical path between the laser 1 and the sample 8, such as Figure 6 shown.

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Abstract

The invention discloses a method for measuring absolute photoluminescence quantum efficiency related to excitation light intensity, which comprises the following steps of: 1, measuring the absolute photoluminescence quantum efficiency of single fixed excitation intensity, 2, obtaining the relative photoluminescence quantum efficiency under different light intensities; and 3, comparing the absolutequantum efficiency value [eta] of the fixed excitation intensity in the step 1 with the relative photoluminescence quantum efficiency obtained in the step 2, finding the relative photoluminescence quantum efficiency R(x) under the excitation intensity and replacing, and amplifying or reducing the relative photoluminescence quantum efficiency under other excitation intensities according to the proportion. According to the invention, the absolute PLQE of single fixed excitation intensity is measured by using the integrating sphere test system, and then the absolute PLQE and the relative photoluminescence quantum efficiency obtained by the phase-locked measurement system under different excitation light intensities are mutually calibrated, so that the absolute photoluminescence quantum efficiency of the material under different excitation light intensity conditions can be rapidly and accurately measured.

Description

technical field [0001] The invention relates to the technical field of electroluminescence materials, in particular to a method for measuring absolute photoluminescence quantum efficiency related to excitation light intensity. Background technique [0002] With the rapid development of today's display technology, new materials for electroluminescence have been extensively studied. Whether it is inorganic quantum dots, organic semiconductors or organic-inorganic hybrid perovskite and other semiconductor materials, their luminous performance can be measured using photoluminescence quantum efficiency (PLQE). At present, the quantum efficiency test technology combining integrating sphere and spectrometer is generally used to evaluate the performance. However, the researchers found in the test that the quantum efficiency under the condition of a single excitation intensity has limited reference significance for practical applications, because the non-radiative recombination and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/63G01N21/64
CPCG01N21/63G01N21/64
Inventor 王建浦邹伟
Owner NANJING UNIV OF TECH