CN110907411A - Steady-state luminous magnetic field effect tester - Google Patents
Steady-state luminous magnetic field effect tester Download PDFInfo
- Publication number
- CN110907411A CN110907411A CN201911141220.5A CN201911141220A CN110907411A CN 110907411 A CN110907411 A CN 110907411A CN 201911141220 A CN201911141220 A CN 201911141220A CN 110907411 A CN110907411 A CN 110907411A
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- Prior art keywords
- magnetic field
- steady
- field effect
- electromagnet
- light source
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1717—Systems in which incident light is modified in accordance with the properties of the material investigated with a modulation of one or more physical properties of the sample during the optical investigation, e.g. electro-reflectance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1717—Systems in which incident light is modified in accordance with the properties of the material investigated with a modulation of one or more physical properties of the sample during the optical investigation, e.g. electro-reflectance
- G01N2021/1727—Magnetomodulation
Abstract
The invention discloses a steady-state luminous magnetic field effect tester, which comprises an excitation light source, an electromagnet, a sample cavity, a monochromator, a detector and a controller, wherein the electromagnet comprises an upper electromagnet and a lower electromagnet, the sample cavity is arranged between the upper electromagnet and the lower electromagnet, a sample to be tested is arranged in the sample cavity, the excitation light source excites the sample to be tested to emit light, the monochromator separates the emitted light from laser light and then inputs the light into the detector, the detector records the intensity of an optical signal and inputs the intensity of the optical signal into the controller, and the controller is respectively connected with the excitation light source and the electromagnet. The steady-state luminous magnetic field effect detection device has high sensitivity and low detection limit, and realizes the measurement of the steady-state luminous magnetic field effect.
Description
Technical Field
The invention relates to the field of detection of photoelectric magnetic devices, in particular to a steady-state luminous magnetic field effect tester.
Background
The magnetic field effect refers to a phenomenon that intrinsic characteristics of a non-magnetic material are influenced by an external magnetic field, and is defined as a ratio of a value of the material characteristics changed by the external magnetic field to an intrinsic value in the absence of the magnetic field, and is generally expressed by percentage. Experiments show that the luminescence, current and dielectric constant of the non-magnetic material are all influenced by external magnetic fields. First, an applied magnetic field may enhance or diminish the properties of the photovoltaic material while maintaining other conditions. Taking the luminous intensity as an example, under the condition of no change of the optical excitation condition, the luminous intensity can be changed by an external magnetic field, and the change amount is within one time; the luminous intensity enhanced by the external magnetic field is a positive magnetic field effect, and the luminous intensity weakened by the external magnetic field is a negative magnetic field effect. Secondly, the influence of the external magnetic field on the material characteristics is related to the magnetic field intensity, the magnetic field intensity is improved, and the magnetic field effect is changed along with the improvement.
The steady-state luminescence magnetic field effect refers to a phenomenon that an external magnetic field can change the photoluminescence intensity. The luminous magnetic field effect can reflect the photophysical mechanism of photoelectric materials and devices, and is basic data for researching materials, and no mature commercial instrument can be used for measuring the luminous magnetic field effect at present.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a steady-state luminous magnetic field effect tester. The invention realizes the accurate detection of the steady-state luminous magnetic field effect by controlling the electromagnet and the optical detector to work cooperatively through software.
The invention adopts the following technical scheme:
a steady-state luminous magnetic field effect tester comprises an excitation light source, an electromagnet, a sample cavity, a monochromator, a detector and a controller, wherein the sample cavity is arranged between an N pole and an S pole of the electromagnet, a sample to be tested is arranged in the sample cavity,
the excitation light source excites a sample to be detected to emit light, the monochromator separates the emitted light from laser and then inputs the light into the detector, the detector records the intensity of an optical signal and inputs the intensity into the controller, and the controller is respectively connected with the excitation light source and the electromagnet.
The invention also comprises a display, wherein the controller is connected with the display and is used for reading and displaying the photon number-time sequence information.
The excitation light source is a monochromatic laser.
The detector comprises a photomultiplier tube for converting the optical signal into an electric signal and a multimeter for measuring current and voltage signals.
The excitation light source is a xenon lamp, a deuterium lamp, a halogen lamp or a super-continuous white laser.
The electromagnet of the invention generates a magnetic field, the magnetic field intensity and the magnetic field direction are adjustable, and the magnetic field is uniformly distributed in space and time.
The sample cavity is of a full-sealing structure and is made of nonmagnetic materials.
The invention has the beneficial effects that:
(1) the instrument aims at testing the effect of a steady-state luminous magnetic field, simultaneously meets the functions of optical excitation and electric excitation, and has two switchable functions; the positive and negative magnetic field effects can be tested.
(2) The invention directly measures the photoelectric current data output by the single-side instrument without a trans-impedance amplifier.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a graph showing the test results of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.
Examples
As shown in fig. 1, a steady-state luminescence magnetic field effect tester comprises an excitation light source 1, a controller 2, a sample chamber 3, an electromagnet 4, a monochromator 5 and a detector 6, wherein the electromagnet is used for generating an external magnetic field, the magnetic field intensity and the magnetic field direction are adjustable, the controller is used for controlling, and the magnetic field is uniformly distributed in space and time.
The electromagnet comprises an upper electromagnet and a lower electromagnet, and the sample cavity is arranged between the N pole and the S pole of the electromagnet and used for fixing a sample. The sample cavity is of a full-sealing structure and made of a non-magnetic material, and an optical window is reserved.
The excitation light source is used for exciting a light source of the material to emit light, has double functions of optical excitation and electric excitation, and can be switched between the two functions. Preferably a monochromatic laser, or a light source such as a xenon lamp, a deuterium lamp, a halogen lamp, or an ultra-continuous white laser.
The monochromator is used for separating excitation light and emission light in the emission light of a sample to be tested and selecting the emission wavelength, and any wavelength can be selected, and the selection mode can be manual control or software remote control.
The detector is used for recording optical signals separated by the monochromator and comprises a photomultiplier or an avalanche diode for converting the optical signals into electric signals and a multimeter for measuring current and voltage signals.
The controller is respectively connected with the excitation light source, the electromagnet and the detector.
The controller is connected with the display and is used for reading and displaying the photon number-time sequence information in real time.
The working principle of the invention is as follows:
the controller controls the electromagnet to generate a magnetic field and simultaneously tests the luminous intensity; and the magnetic field intensity is sequentially increased from zero to a target value according to the setting of the controller, the magnetic field intensity stays for a proper time at each new magnetic field intensity, corresponding luminous intensity data are tested after the magnetic field is stabilized, and the change value of the luminous intensity is calculated in real time after the data are fed back. And then, raising the magnetic field to a higher strength and testing, circulating until the target strength is reached and stopping testing, and finally obtaining the relation between the magnetic field strength and the magnetic field effect.
The test of this example is based on an organic thin film material tetracene excited with a 532nm laser, and the photoluminescence of the tetracene material was collected with a PMT after passing through a monochromator to detect the change in emitted light intensity at 630 nm. The magnetic field adopts an electromagnet, the initial intensity is 0mT, the target intensity is 220mT, the relationship between the change value of the luminous intensity and the magnetic field intensity is shown in figure 2, and the magnetic field effect is a positive value.
The invention relates to a steady-state luminous magnetic field effect testing instrument which can be used for testing steady-state luminous magnetic field effect, can be applied to the research field of organic photoelectron materials and devices, and can also be applied to the research field of organic spin photoelectron materials and devices.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (7)
1. A steady-state luminous magnetic field effect tester is characterized by comprising an excitation light source, an electromagnet, a sample cavity, a monochromator, a detector and a controller, wherein the sample cavity is arranged between an N pole and an S pole of the electromagnet, a sample to be tested is arranged in the sample cavity,
the excitation light source excites a sample to be detected to emit light, the monochromator separates the emitted light from laser and then inputs the light into the detector, the detector records the intensity of an optical signal and inputs the intensity into the controller, and the controller is respectively connected with the excitation light source and the electromagnet.
2. The steady-state luminous field effect tester as claimed in claim 1, further comprising a display, wherein the controller is connected with the display for reading and displaying photon number-time sequence information.
3. The steady-state luminescence magnetic field effect tester according to claim 1, wherein the excitation light source is a monochromatic laser.
4. The steady-state luminescence magnetic field effect tester according to claim 1, wherein the detector comprises a photomultiplier tube for converting the optical signal into an electrical signal and a multimeter for measuring the current and voltage signals.
5. The steady-state luminescence magnetic field effect tester according to claim 1, wherein the excitation light source is a xenon lamp, a deuterium lamp, a halogen lamp or an ultra-continuous white laser.
6. A steady state luminous field effect tester as claimed in claim 1, wherein the magnetic field generated by the electromagnet is uniformly distributed in space and time.
7. The steady-state luminescence magnetic field effect tester according to claim 1, wherein the sample chamber is a fully sealed structure and the material is non-magnetic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911141220.5A CN110907411A (en) | 2019-11-20 | 2019-11-20 | Steady-state luminous magnetic field effect tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911141220.5A CN110907411A (en) | 2019-11-20 | 2019-11-20 | Steady-state luminous magnetic field effect tester |
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| Publication Number | Publication Date |
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| CN110907411A true CN110907411A (en) | 2020-03-24 |
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| CN201911141220.5A Pending CN110907411A (en) | 2019-11-20 | 2019-11-20 | Steady-state luminous magnetic field effect tester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112362581A (en) * | 2020-10-28 | 2021-02-12 | 华南理工大学 | Non-magnetic sample cavity for measuring magnetic field effect |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2636229Y (en) * | 2003-07-10 | 2004-08-25 | 厦门大学 | Magnetic field device for molecular lighting analysis |
| KR20130079732A (en) * | 2012-01-03 | 2013-07-11 | 상지대학교산학협력단 | System for measuring sanal's motion of primo vascular system under the magnetic field |
| CN103756899A (en) * | 2014-02-18 | 2014-04-30 | 中国科学院合肥物质科学研究院 | Biological continuous culturing and microscopic imaging device for steady-state high-intensity magnetic field effect researches |
-
2019
- 2019-11-20 CN CN201911141220.5A patent/CN110907411A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2636229Y (en) * | 2003-07-10 | 2004-08-25 | 厦门大学 | Magnetic field device for molecular lighting analysis |
| KR20130079732A (en) * | 2012-01-03 | 2013-07-11 | 상지대학교산학협력단 | System for measuring sanal's motion of primo vascular system under the magnetic field |
| CN103756899A (en) * | 2014-02-18 | 2014-04-30 | 中国科学院合肥物质科学研究院 | Biological continuous culturing and microscopic imaging device for steady-state high-intensity magnetic field effect researches |
Non-Patent Citations (1)
| Title |
|---|
| 李婧: "红荧烯掺杂薄膜中激子裂变过程的磁场效应研究", 《中国优秀硕士学位论文全文数据库基础科学辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112362581A (en) * | 2020-10-28 | 2021-02-12 | 华南理工大学 | Non-magnetic sample cavity for measuring magnetic field effect |
| CN112362581B (en) * | 2020-10-28 | 2022-02-15 | 华南理工大学 | Non-magnetic sample cavity for measuring magnetic field effect |
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