Detection device and detection method for hole capturing dynamics of surfaces of quantum dots

A detection device and detection method technology, which is applied in the field of laser applications, can solve problems such as difficulties in the electron or hole capture process, and achieve the effect of eliminating intensity noise

Inactive Publication Date: 2015-04-29
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Even under weak excitation light conditions, the multi-carrier Auger non-radiative process is ignored, and it is still very difficult to accurately describe the electron or hole capture process

Method used

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  • Detection device and detection method for hole capturing dynamics of surfaces of quantum dots
  • Detection device and detection method for hole capturing dynamics of surfaces of quantum dots

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Experimental program
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Embodiment

[0051] In this embodiment, experimental sample 4 is CdS colloidal quantum dots (the luminescence peak is at 471 nm, purchased from Sigma-Aldrich Company), and the purchased sample is placed in a 1 mm thick quartz cuvette. The sample is placed in the uniform magnetic field provided by the electromagnet, and the strength of the applied transverse magnetic field is 0.5T. The wavelengths of the three beams are all set at 471nm, and the output light is passed through the optical parametric amplifier ( Topas) and BBO sum frequency or frequency multiplier, its output wavelength is continuously adjustable from 300-2700nm. The power of the first pump light pulse 1 is 0.8W / cm 2 , the power of the second pump light pulse 2 is 1.5W / cm 2 . Relative to the surface normal of the experimental sample 4, the first pumping light pulse 1 is obliquely incident at an angle of about -10 degrees, the second pumping light pulse is incident at an oblique angle of about 10 degrees, and the probe ligh...

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Abstract

The invention discloses a detection device for hole capturing dynamics of surfaces of quantum dots. The detection device comprises a first pumping light pulse, a second pumping light pulse, a detection light pulse, an electromagnet, a half-wavelength plate, a polarized beam splitter, a differential balance detector and a phase-locked amplifier, wherein the first pumping light pulse is generated by an ultrashort pulse laser device through frequency conversion of an optical parameter amplifier, and the change of amplitude of an electronic spinning coherent signal along the delay time can be detected by changing the delay time between the first pumping light pulse and the second pumping light pulse through the differential balance detector. According to the detection device and the detection method, the weak light excitation is not utilized, the influence from recombination of carrier radiation and auger non-radiation can be completely eliminated, and the transient dynamic characteristics captured by the surface holes of the quantum dots can be directly reflected through monitoring the transient change of the electronic spinning signal amplitude. The invention further discloses a detection method for hole capturing dynamics on surfaces of quantum dots.

Description

technical field [0001] The invention belongs to the field of laser application technology, and in particular relates to a detection device and a detection method for hole capture dynamics on the surface of quantum dots. Background technique [0002] The velocity of charged carriers trapped on the surface of quantum dots affects the optoelectronic properties of the material, which has aroused extensive research interest. Compared with bulk materials, the size effect of quantum dots leads to enhanced surface atomic effects, and electrons or holes are easily captured by unsaturated bonds. The surface trapping carrier effect will lead to the degradation of device performance and become the main limiting factor in the practical application of quantum dot materials. Researchers have been actively exploring various dynamics of surface carrier capture and gaining insight into its mechanisms, such as: carrier relaxation and recombination dynamics, quantum generation mechanism of pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/21
Inventor 邓莉冯东海李晓仝海芳
Owner EAST CHINA NORMAL UNIV
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