Medium and method for protecting triplet excited state of photosensitizer through photochemically removing oxygen and application

A triplet excited state, photosensitizer technology, applied in chemical instruments and methods, photosensitive materials for optomechanical devices, fluorescence/phosphorescence, etc., can solve problems such as lack of fluidity

Active Publication Date: 2018-10-30
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Medium and method for protecting triplet excited state of photosensitizer through photochemically removing oxygen and application
  • Medium and method for protecting triplet excited state of photosensitizer through photochemically removing oxygen and application
  • Medium and method for protecting triplet excited state of photosensitizer through photochemically removing oxygen and application

Examples

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Embodiment 1

[0064] In this embodiment, PVP is used as a solid medium, and PVP gel is used for photochemical oxygen removal to protect the emission of phosphorescence. The method is: adding 6g of PVP with a molecular weight of 40000 into methylene chloride containing photosensitizer formula II, the concentration of photosensitizer is 1.0×10 -5 mol·dm -3 , stir to promote the complete dissolution of PVP into a fluid, place it in a dark environment to volatilize dichloromethane, and form a gel with a fixed shape after 12 hours. The photoactivation spectrum of photosensitizer formula II in PVP gel is as follows: figure 1 shown.

Embodiment 2

[0066] This example proves that PVP can not only form a gel in dichloromethane for photolithography and activation, but also perform photolithography and activation in methanol and water. The specific implementation method is (taking methanol gel as an example): 6g PVP (molecular weight 40000) is added in the methanol solution containing photosensitizer formula I in 10ml, and the concentration of photosensitizer is 1.0×10 -4 mol·dm -3 After the PVP is completely dissolved, it is placed next to an infrared drying oven to accelerate methanol volatilization. After about 14 hours, a gel is formed. Stick the hollow pattern on the surface of the gel, then irradiate the gel with a UV flashlight for photolithography, and use a UV flashlight with a lower energy density to reproduce the photolithographic pattern. figure 2 Shown are photosensitizer formula I in methanol gel photoactivation spectrum and photolithographic pattern display results. image 3 The photoactivation spectrum of...

Embodiment 3

[0068] This example proves that the PVP gel can be repeatedly subjected to photolithography. The specific implementation is: add 6 g of PVP with a molecular weight of 40,000 to the dichloromethane solution containing the photosensitizer 2, and the concentration of the photosensitizer is 1.0×10 -5 mol·dm -3 , after the PVP is completely dissolved, pour it into a petri dish with a radius of 6.5cm, and place it in the dark for 12 hours to form a gel, and then irradiate the hollow pattern attached to the surface dish with ultraviolet light (365nm) for about 20s, and the ultraviolet light The distance to the hollow pattern is 5cm, and the optical power density is 30mW·cm -2 . Phosphorescence patterns appeared on the top of the gel when illuminated with a weak ultraviolet light source. Repeated photolithography and erasure for the same gel, the results in Figure 4 It is shown that the separated photos here have experienced the disappearance of photolithographic traces and then t...

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Abstract

The invention provides a medium and a method for protecting a triplet excited state of a photosensitizer by photochemically removing oxygen and application. The medium is polyvinylpyrrolidone. The method comprises the steps of mixing PVP, the photosensitizer and a solvent, standing to form gel, and irradiating the gel by virtue of a laser method. According to the method, the situation that phosphorescence is quenched by oxygen in air is prevented; and the method is applied to the fields of observation and test experiments for photophysical and photochemical processes, the conversion of photoetching or triplet state-triplet state annihilation photons and the like.

Description

technical field [0001] The invention belongs to the field of nonlinear optical materials, and relates to a medium, a method and an application for protecting the triplet excited state of a photosensitizer by photochemically removing oxygen. Background technique [0002] Triplet state: The photosensitizer molecule in the ground state absorbs excitation light of a specific wavelength, the molecule absorbs energy from the ground state and transitions to the singlet excited state, and then due to the rigidity of the molecule itself or the coordination between the molecule and the heavy metal, due to the presence of the heavy metal effect, the molecule The energy between systems can undergo intersystem crossing, from a singlet excited state to a triplet excited state. If the molecule directly emits energy in the form of light from the singlet excited state back to the ground state, this process is fluorescence emission, and the lifetime is generally on the order of nanoseconds. ...

Claims

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Application Information

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IPC IPC(8): C09B47/04C09B57/00C09B57/08G03F7/004G01N21/31G01N21/64
CPCC09B47/045C09B57/00C09B57/08G01N21/31G01N21/64G01N21/6408G01N21/6428G01N2021/6432G03F7/004
Inventor 林进雄万仕刚陆为
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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