Method for improving photoluminescence intensity of CsPbCl3 perovskite and fluorescence spectrum testing method

A technology of photoluminescence and perovskite, applied in fluorescence/phosphorescence, preparation of test samples, measurement devices, etc., can solve the problem of limiting the application of lead halide cesium nanocrystal materials, increasing the probability of non-radiative transition, and the luminous efficiency of nanocrystals Low-level problems, to achieve significant PL enhancement effect, enhance local electromagnetic field, and simple operation

Inactive Publication Date: 2019-08-20
NANJING UNIV OF SCI & TECH
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Problems solved by technology

And CsPbX whose emission wavelength is in the blue-violet region 3 (X=Cl or Cl / Br) nanocrystals have low luminous efficiency, especially CsPbCl 3 PLQY below 10%
Mainly due to CsPbCl 3 The defect formation energy is low, resulting in a large number of defects in the structure, increasing the probability of non-radiative transition, which greatly limits the application of cesium lead halide nanocrystalline materials in the short wavelength region

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  • Method for improving photoluminescence intensity of CsPbCl3 perovskite and fluorescence spectrum testing method
  • Method for improving photoluminescence intensity of CsPbCl3 perovskite and fluorescence spectrum testing method

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[0034] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0035] This kind improves the method for the photoluminescence intensity of CsPbCl3 perovskite, comprises the steps:

[0036] Step (1): Prepare Al@C plasma by liquid phase laser ablation method. details as follows,

[0037] Step 1.1: Turn on the pulsed laser, set the laser wavelength to 1064nm, and adjust the laser to Q-Switch continuous pulse mode with a pulse frequency of 10Hz and a pulse width of 10ns. Adjust the laser voltage so that the laser energy is 140mJ. Kee...

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Abstract

The invention discloses a method for improving the photoluminescence intensity of CsPbCl3 perovskite. The method includes the following steps of: preparing Al@c plasmas; preparing a CsPbCl3 solution;and mixing the CsPbCl3 solution with the Al@c plasmas. The absorption resonance peak of the Al@c plasmas is close to the excitation light peak position of the CsPbCl3; a local electromagnetic field isenhanced through the LSPR characteristic of the Al@c plasmas; a method for carrying out fluorescence spectrum testing on the solution by using a disclosed fluorescence spectrophotometer is utilized to verify that the mixing of the CsPbCl3 solution and the Al@c plasmas can really improve the excitation efficiency of the CsPbCl3 and realize the enhancement of PL.

Description

technical field [0001] The present invention relates to a kind of improving CsPbCl 3 The invention discloses a method for photoluminescent intensity of perovskite, which belongs to the technical field of perovskite luminous efficiency. Background technique [0002] Photoluminescence (PL for short) is a kind of luminescence, which refers to the process in which a substance absorbs photons (or electromagnetic waves) and re-radiates photons (or electromagnetic waves). From the theory of quantum mechanics, this process can be described as a process in which a substance absorbs photons and transitions to a higher-energy excited state, then returns to a lower-energy state and releases photons at the same time. as ABX 3 CsPbCl, one of the important members of type perovskite compounds 3 , has a photoluminescence effect, which can produce blue light of about 420nm under the irradiation of excitation light of 266nm. Purely inorganic perovskite materials, especially CsPbX 3 (X=Cl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64G01N1/38
CPCG01N1/38G01N21/643
Inventor 赵明幽韦奕王玉捷史鑫宇陈军
Owner NANJING UNIV OF SCI & TECH
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