JP4446396B2 - Microphotoluminescence measuring apparatus and measuring method - Google Patents

Description

  The present invention relates to a microphotoluminescence measuring apparatus for measuring photoluminescence (PL) emitted from a sample irradiated with laser light or spontaneous emission light, and a method for measuring the same. Can be specified.

When light having energy greater than the band gap is incident on a semiconductor, free electrons and holes are generated in the excited semiconductor crystal. PL is light generated when the free electrons and holes are recombined.
FIG. 9 is a band model diagram of an n-type semiconductor for explaining PL light emission. As shown in FIG. 9 (a), when excitation light (Above-Gap Excitation: AGE) having energy greater than or equal to the band gap (forbidden band) is incident, the valence band changes to the conduction band. Transferring electrons are generated and holes are generated in the valence band. PL is generated when these electrons recombine with holes in the valence band. This is called luminescence recombination.

However, if the crystal contains defects such as vacancies and impurities, there are non-radiative recombination levels (state 1) due to defects and impurities in the forbidden band, and some of the electrons that have shifted to the conduction band Some recombine with holes at this energy level. In this case, since no PL is generated, it is called non-radiative recombination.
Therefore, when the semiconductor crystal contains many defects and impurities, the ratio of non-radiative recombination to radiative recombination increases, and the PL intensity decreases. Therefore, the state of the semiconductor crystal can be evaluated nondestructively through the measurement of the PL intensity.

The present inventors have previously developed a method for measuring the level in the forbidden band that causes non-radiative recombination (Patent Document 1 below). In this method, PL is measured by irradiating a semiconductor crystal with excitation light AGE having a band gap energy width or larger and excitation light BGE (Below-Gap Excitation) having a band gap energy width or less. Therefore, this method is called a two-wavelength excitation PL method.
FIG. 10 schematically shows a measurement apparatus for the two-wavelength excitation PL method. This apparatus includes an AGE excitation light source 11, a BGE excitation light source 12, a cooling container 13 that cools a sample 14 with liquid nitrogen, a microscope tube 15 that collects PL emitted from the sample 14, and a filter 21. The relationship between the bundle fiber 20 on which the passed PL is incident, the spectroscope 16 that splits the PL guided by the bundle fiber 20, the photomultiplier tube 17 that converts the split PL into an electrical signal, and PL and BGE. An oscilloscope 18 for displaying and a CPU 19 for controlling BGE are provided.

The sample 14 is irradiated with a certain AGE alone, or this AGE and a BGE with various values are superimposed and irradiated. When BGE is superimposed on AGE, PL increases or decreases depending on the size of BGE than when AGE alone is irradiated.
For example, as shown in FIG. 9A, when the size of BGE superimposed on AGE corresponds to the energy gap between the (state 1) level and the conduction band , from the valence band due to AGE to the conduction band. In addition to the excitation of, the electrons trapped in the (state1) level are excited to the conduction band by BGE, so that the amount of electrons transferred to the conduction band is larger than in the case of AGE irradiation alone, and light emission recombination And the PL increases.

On the other hand, as shown in FIG. 9B, if the size of the BGE superimposed on the AGE corresponds to the energy gap between the (state1) level and the (state2) level, In addition to excitation to the conduction band, electrons trapped in the (state 1) level are excited to the (state 2) level by BGE. In this case, when electrons excited to the (state 2) level recombine with holes in the valence band, they are non-radiative recombination. In addition, since the (state1) level is vacant, the number of electrons trapped in the (state1) level increases, so that the number of electrons that perform luminescence recombination is reduced compared with the case of AGE single irradiation, and PL Decrease.
As described above, in the two-wavelength excitation PL method, the level within the forbidden band can be specified by performing PL measurement while changing the size of BGE in various ways, and the state of the semiconductor crystal is more accurately and quantitatively determined. Can be evaluated.
JP 2002-286640 A

When a semiconductor material is evaluated using a PL measuring device, the measurement is usually performed at one point on the sample, and the accuracy of the measurement position is not so much required.
However, since the two-wavelength excitation PL method can accurately determine the state of the sample at the measurement position, the PL measurement device that implements the two-wavelength excitation PL method can accurately specify the measurement range. Very meaningful.

  In the conventional apparatus, as disclosed in Japanese Patent Laid-Open No. 2006-349482, a PL mapping measurement apparatus that scans the measurement apparatus relative to the sample and displays the measurement result and the position information in association with each other is also provided. Although developed, this type of device is large and not suitable for simple use. Further, when observing a specific region, it is difficult to match the observation region of the apparatus to the target location, and considerable skill is required to observe the target location in an optimal state.

  The present invention was devised in view of such circumstances, and it is intended to provide a microphotoluminescence measuring device that can easily specify an observation region and can be configured in a small size, and to provide a measuring method thereof. Yes.

A microphotoluminescence measuring apparatus according to the present invention includes an objective lens facing a sample, a microscope barrel having the objective lens attached to one end thereof, and a bundle for guiding light emitted from the other end of the microscope barrel to an optical analysis means A fiber, position adjusting means installed at the other end of the microscope barrel for adjusting the position of the bundle fiber facing the microscope barrel, and illumination light from the illumination light source incident on the microscope barrel A half mirror that reflects in the direction of the objective lens at the axial center position of the microscope cylinder, reflects the sample and transmits the reflected light of the illumination light that has entered the microscope cylinder from the objective lens, and Half mirror moving means for moving the half mirror to an axial center position of the microscope cylinder and a position deviating from the axial center position, and reflected light of the illumination light transmitted through the half mirror Reflecting mirror that reflects in the direction of the epi-illumination observation means at the axial center position of the microscope cylinder, and reflecting mirror moving means that moves the reflecting mirror to the axial position of the microscope cylindrical body and a position deviating from the axial position And an excitation light source for exciting light for exciting the sample, and a field stop installed in the microscope barrel for selecting an observation region of the sample that is excited by the excitation light and emits photoluminescence. The half mirror, the field stop, and the reflecting mirror are arranged in the microscope barrel from the one end where the objective lens is mounted in this order toward the other end where the bundle fiber position adjusting means is installed. When the reflected light from the illumination light is observed by the epi-illumination observation means, the half mirror and the reflecting mirror are placed at the axial center position of the microscope cylinder, and the bundle fiber When adjusting the position opposite to the serial microscope tube body in said position adjustment means, it said half mirror is placed in a central axial position of the microscope cylinder, placed in a position where the reflecting mirror is out of the axis position The position adjustment means adjusts the facing position of the bundle fiber based on the amount of reflected light of the illumination light incident on the bundle fiber, and when observing the photoluminescence emitted from the sample, The half mirror and the reflecting mirror are placed at a position deviating from the axial center position of the microscope barrel.
In this measuring apparatus, the surface of the sample is observed with epi-illumination observation means, the PL observation region is selected by the field stop, and the position of the bundle fiber is adjusted so that the light beam focused by the field stop is appropriately incident on the bundle fiber. Adjust with the position adjustment means.

Further, this microscopic photoluminescence measurement apparatus, adjustment of the position facing the fiber bundle by the position adjusting means is performed based on the amount of reflected light of the illumination light incident on the bundle fiber.
Since the light from the illumination light source is brighter than PL, the position adjustment of the bundle fiber by the position adjusting means is easy.

  Further, in this microphotoluminescence measuring device, as the optical analysis means, a spectroscope that splits the light guided by the bundle fiber, and a photomultiplier tube that converts the light split by the spectroscope into an electric signal or A light receiving element, and the adjustment by the position adjusting means is performed by extracting light having a wavelength of the illumination light source from the light incident on the bundle fiber by the spectroscope and transmitting the light to the photomultiplier tube or the light receiving device. This can be realized by converting the electrical signal into an electric signal by an element and adjusting the facing position of the bundle fiber so that the output of the photomultiplier tube or the light receiving element is maximized.

Further, in this microphotoluminescence measuring device, the field stop can be composed of a plurality of plate members that can move independently along a plane perpendicular to the axis of the microscope cylinder, A closed space defined by the edges of the plurality of plate members is an optical path.
When this field stop is used, an arbitrary region of the sample observed with epi-illumination can be selected as the PL observation region.

Moreover, in this microphotoluminescence measuring device, the microscope barrel can be further provided with a moving means that enables movement in the X, Y, and Z directions.
This moving means realizes large movement of the microscope cylinder in the X, Y, and Z directions, and fine setting of the PL observation region is performed by the field stop.

Further, in this microphotoluminescence measuring apparatus, as the excitation light source, a first excitation light source that outputs excitation light that is equal to or greater than the forbidden band energy width of the sample, and excitation light that is equal to or less than the forbidden band energy width of the sample are output. A second excitation light source, and irradiating the observation region of the sample with the excitation light from the first excitation light source alone or superimposing excitation light from the first excitation light source and the second excitation light source Irradiation can be performed.
With this apparatus, it is possible to accurately specify the PL observation region to which the two-wavelength excitation PL method is applied.

Photoluminescence measurement method of the present invention leads an objective lens opposed to the sample, and the microscope tube body the objective lens is mounted on one end, the light shines out from the other end of the microscope barrel to the optical analyzing means bundled fibers, wherein the position adjusting means, wherein disposed at the other end of the microscope cylinder to adjust the position opposite to the microscope tube body of the bundle fiber, the illumination from the illumination source is incident on the microscope tube body A half mirror that reflects light in the direction of the objective lens at the axial center position of the microscope barrel , reflects the sample and transmits the reflected light of the illumination light that has entered the microscope barrel from the objective lens; Half mirror moving means for moving the half mirror to an axial center position of the microscope cylinder and a position deviating from the axial center position, and reflected light of the illumination light transmitted through the half mirror A reflecting mirror that reflects in the direction of the epi-illumination observation means at the axial center position of the microscopic barrel, and a reflecting mirror moving means that moves the reflecting mirror to the axial position of the microscope cylindrical body and to a position that deviates from the axial position. And an excitation light source for exciting light for exciting the sample, and a field stop installed in the microscope barrel for selecting an observation region of the sample that is excited by the excitation light and emits photoluminescence. , the half mirror, a field stop and a reflecting mirror, at the microscope tube body, that has the objective lens in this order is disposed toward the other end position adjusting means is placed in the fiber bundle from one end mounted microscopic a photoluminescence measuring method photoluminescence measurement apparatus, by placing the half mirror and the reflecting mirror to a central axial position of the microscope cylinder, is incident on the microscope tube body The illumination light from the illumination light source is irradiated onto the sample through the half mirror and the objective lens, reflected from the sample, incident on the microscope barrel from the objective lens, and transmitted through the half mirror. by guiding the reflected light toward the incident-light illumination observation means by the reflection mirror, a first step of observing the surface of the sample in the epi-illumination observation means, for selecting an observation region of the sample in the field stop A second step , placing the half mirror at the axial center position of the microscope cylinder, placing the reflecting mirror at a position off the axial center position , reflecting the sample and transmitting the half mirror; wherein as the amount of reflected light of the illumination light becomes maximum through the field stop enters the fiber bundle, by using the position adjusting means, to the microscope tube body of said fiber bundle A third step of setting the opposing position of the sample , and placing the half mirror and the reflecting mirror at a position deviated from the axial center position of the microscope barrel, and irradiating the observation region of the sample with excitation light from the excitation light source And a fourth step of measuring the photoluminescence emitted from the sample, passing through the objective lens and the field stop and entering the bundle fiber, to the optical analysis means.
In this measurement method, the PL observation area can be set easily and accurately using the field stop, and the position of the bundle fiber can be easily adjusted to match the PL observation area set by the field stop. Can do.

Further, in this photoluminescence measurement method, as the excitation light source, a first excitation light source that outputs excitation light that is greater than or equal to the forbidden band energy width of the sample, and excitation light that is less than or equal to the forbidden band energy width of the sample are output. In the fourth step, the observation region of the sample is irradiated alone with the excitation light from the first excitation light source, and the first excitation light source and the second excitation light source are used. It is possible to alternately perform superimposing irradiation of excitation light.
A two-wavelength excitation PL method can be applied to photoluminescence measurement.

  According to the microphotoluminescence measuring apparatus and the measuring method of the present invention, the PL observation region can be specified with high accuracy, and observation in the optimum state of the PL observation region can be easily set. Further, the apparatus can be miniaturized.

An embodiment of a microphotoluminescence measuring device of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view of a microscope tube portion with a cover of the apparatus, and FIG. 2 is a side view of the microscope tube portion. 3 is a cross-sectional view corresponding to the plan view of FIG. 1, and FIG. 4 is a cross-sectional view corresponding to the side view of FIG.

  The microscope tube 15 is arranged horizontally. A manual revolver 32 with an objective lens 31 is rotatably supported at one end of the microscope tube 15, and a position adjusting means 33 for adjusting the position of the bundle fiber 20 is installed at the other end. The manual revolver 32 has four holes for mounting the objective lens 31, and the objective lens 31 facing the sample 14 can be switched by rotating the manual revolver 32. The bundle fiber 20 is a bundle of a large number of fiber strands. As shown in FIG. 10, the tip of the bundle fiber 20 is connected to the spectroscope 16, and the light emitted from the end of the microscope tube 15 is guided to the spectroscope 16. . The position adjusting means 33 has a micrometer 331 that finely moves the position of the end of the bundle fiber 20 in the vertical direction and a micrometer 332 that finely moves in the left-right direction.

An illumination optical system 36 that guides the light from the illumination light source to the inside of the microscope tube 15 is connected to the side of the microscope tube 15 on the objective lens 31 side. An illumination light source (omitted) is connected to the tip of the illumination fiber 361 of the illumination optical system 36, and light emitted from the illumination light source passes through the illumination fiber 361 and is perpendicular to the reflector 362 (FIG. 3). It is bent and enters the inside of the microscope tube 15. Reference numeral 37 denotes a screw for adjusting the optical axis of the illumination optical system 36.
An observation camera (CCD camera) 34 for observing an image when the sample 14 is irradiated with light from an illumination light source is connected to the side of the microscope tube 15 on the position adjusting means 33 side.

A field stop 30 is disposed in the middle of the microscope tube 15, and the microscope tube 15 is divided into a front microscope tube 151 and a rear microscope tube 152 by the field stop 30 (FIG. 1).
FIG. 5 shows details of the field stop 30. FIG. 5A is a front view, and FIG. 5B is a cross-sectional view. The direction perpendicular to the paper surface of FIG. 5A is the axial direction of the microscope tube 15, and the alternate long and short dash line in FIG. 5B is the axial center position of the microscope tube 15. 5B is the bundle fiber 20 side, and the lower side is the objective lens 31 side. FIG. 6 shows four metal thin plates 301, 302, 303, and 304 that constitute the diaphragm. The metal thin plate 301 moves independently in the vertical direction by the rotation of the micrometer 305 and the metal thin plate 302 by the rotation of the micrometer 306. The metal thin plate 303 moves by the rotation of the micrometer 307. The metal thin plate 304 moves independently in the left-right direction as the micrometer 308 rotates. The light flux passes through the closed space 309 defined by the edges of the four thin metal plates 301, 302, 303, 304.

  A half mirror 412 and an imaging optical system 43 are arranged inside the front side microscope tube 151 on the objective lens 31 side from the field stop 30 (FIG. 3). The base of the half mirror 412 is connected to the handle 411, and the tip of the handle 411 protrudes from the front side microscope tube 151. When the handle 411 is moved in a direction perpendicular to the axis of the front microscope tube 151 (the arrow direction in FIG. 1), the half mirror 412 moves in the same manner. When the handle 411 is pushed most into the front side microscope tube 151, the center of the half mirror 412 comes to the position of the axial center of the front side microscope tube 151. At this time, the light of the illumination light source that is bent at a right angle by the reflecting mirror 362 (FIG. 3) and enters the front side microscope tube 151 is reflected by the half mirror 412 and proceeds in the direction of the objective lens 31, and the surface of the sample 14 Irradiate. The light reflected by the surface of the sample 14 is collected by the objective lens 31, reaches the half mirror 412, passes through the half mirror 412, and enters the imaging optical system 43.

Further, when the handle 411 is pulled out most from the front side microscope tube 151, the half mirror 412 moves near the side surface of the front side microscope tube 151, and the light of the illumination light source reflected by the half mirror 412 is no longer incident on the objective lens 31. do not do. The light that has entered the front microscope tube 151 through the objective lens 31 is directly incident on the imaging optical system 43 without passing through the half mirror 412.
As described above, the half mirror 412 and the handle 411 constitute the illumination optical system switching mechanism 41.
When light is incident, the imaging optical system 43 forms an intermediate image on a plane including the position of the closed space 309 of the field stop 30, and arbitrarily selects one part by the closed space 309 of the field stop 30. be able to.

Further, a switching mechanism 42 including a reflecting mirror 422 and a handle 421 is disposed inside the rear microscope tube 152 on the bundle fiber 20 side from the field stop 30 (FIG. 3). Similarly to the handle 411, the handle 421 can be moved in a direction perpendicular to the axis of the rear microscope tube 152 (in the direction of the arrow in FIG. 1), and when the handle 421 is pushed most into the rear microscope tube 152, the reflecting mirror The center of 422 comes to the position of the axis of the microscope tube 15. At this time, the light incident on the reflecting mirror 422 from the direction of the objective lens 31 is reflected by the reflecting mirror 422 and enters the CCD camera 34. Further, when the handle 421 is most pulled out from the rear microscope tube 152, the reflecting mirror 422 moves near the side surface of the rear microscope tube 152, and light incident from the direction of the objective lens 31 is blocked by the reflecting mirror 422. It proceeds without being incident on the bundle fiber 20.
Thus, the reflecting mirror 422 and the handle 421 constitute an image observation / PL observation switching mechanism 42 that switches between image observation by the CCD camera 34 and PL observation by the optical analysis means.

  Further, the microscope tube 15 moves the microscope tube 15 in the vertical direction, the Z stage 53 that moves the microscope tube 15 in the axial direction, and the microscope tube 15 moves in the horizontal direction perpendicular to the axial center. It is supported by the Y stage 52 (FIG. 2). The microscope tube 15 moves in the vertical direction when the Z screw 531 of the Z stage 53 is rotated, and moves in the axial direction when the X screw 511 of the X stage 51 is rotated, and the Y screw 521 ( Rotating (Fig. 1) translates horizontally.

  The cooling means and excitation means for the sample 14 and the analysis means for the generated PL are the same as in FIG. 10, and the cooled sample 14 is excited by the AGE excitation light source 11 and the BGE excitation light source 12. PL generated by the excitation is analyzed by a photoanalyzer such as a spectroscope 16, a photomultiplier tube or light receiving element 17, an oscilloscope 18, or the like.

Next, a procedure for measuring PL using this apparatus will be described.
First, as shown in FIG. 7A, the illumination optical system switching mechanism 41 is set so that the field stop 30 is fully opened and the half mirror 412 is positioned at the axial center of the microscope tube 15, and the reflecting mirror 422 is a microscope. The image observation / PL observation switching mechanism 42 is set so as to come to the axial center position of the cylinder 15.
In this state, the light from the illumination light source is reflected by the half mirror 412 to irradiate the sample 14, and the reflected light of the sample 14 is transmitted by the half mirror 412, then reflected by the reflecting mirror 422 and incident on the CCD camera 34. To do. Therefore, the observation by the epi-illumination (illumination applied from above the sample) on the surface of the sample 14 can be performed using the image of the CCD camera 34.

Next, as shown in FIG. 7B, the PL observation region is selected by the field stop 30 while viewing the image of the CCD camera 34 by epi-illumination.
At this time, the bundle fiber 20 is not necessarily located on the extension line of the light beam focused by the field stop 30.
In order to adjust the position of the bundle fiber 20, the image observation / PL observation switching mechanism 42 is set so that the reflecting mirror 422 deviates from the axial center position of the microscope tube 15 as shown in FIG.
In this state, the light from the illumination light source reflected from the surface of the sample 14 is stopped by the field stop 30 and then reaches the rear end of the microscope tube 15. The position of the bundle fiber 20 is set by the position adjusting means 33 so that the light beam enters the bundle fiber 20 in an optimal state.
At this time, the light having the wavelength of the illumination light source is extracted from the light incident on the bundle fiber 20 by the spectroscope 16, and the light extracted by the spectroscope 16 is converted into an electric signal by the photomultiplier tube or the light receiving element 17, If the position of the bundle fiber 20 is adjusted so that the output of the photomultiplier tube 17 is maximized, the bundle fiber 20 is set to the optimum position.

Next, as shown in FIG. 7 (d), the illumination optical system switching mechanism 41 is set so that the half mirror 412 deviates from the axial center position of the microscope tube 15, and the sample 14 is irradiated with AGE alone or AGE. Overlapping irradiation with BGE is performed to generate PL from the sample 14.
The generated PL is guided to the inside of the microscope tube 15 through the objective lens 31, and the PL in the observation region selected by the field stop 30 enters the bundle fiber 20, and the spectroscope 16, the photomultiplier tube or the light receiving element 17, the oscilloscope. The optical analysis means such as 18 is used.

FIG. 8A shows an image when a metal plate having a large number of holes is placed on the phosphor and observed with epi-illumination. FIG. 8B shows an image of PL when the sample is irradiated with excitation light. PL is generated at the portion of the phosphor viewed from the hole of the metal plate.
FIG. 8 (c1) shows a PL image when the field stop 30 is used and the PL observation region is limited to only the upper left portion. Similarly, FIG. 8 (c2) shows the PL observation region only at the upper right portion. 8 (c3) shows the PL image when the PL observation region is limited to only the lower left portion, and FIG. 8 (c4) shows the PL image when the PL observation region is limited to only the lower right portion. ing.
As can be seen from FIG. 8, the brightness of PL is very low compared to the brightness of the reflected light of the epi-illumination (FIG. 8A). Therefore, positioning the bundle fiber 20 using a weak PL is extremely difficult and requires skill, but with this apparatus, as shown in FIG. 7C, the bundle fiber 20 is reflected using reflected light of epi-illumination. Since the positioning of 20 is performed, it is easy to set the bundle fiber 20 to a position suitable for the PL observation region, and it is possible to set to the accurate position.

Moreover, in this apparatus, since the field stop 30 is composed of four metal plates that can be moved independently, the position and area of the PL observation region can be set arbitrarily and with high accuracy. By providing this field stop 30, only a specific region of the sample can be measured, and the state of the sample can be precisely observed using the two-wavelength excitation PL method. The number of metal plates constituting the field stop 30 may be other than four.
Moreover, since this apparatus can be used for observation by epi-illumination, the PL observation area can be selected based on a clear image, and the PL observation area can be easily selected.
In addition, this device can be configured more compactly than conventional devices.

In addition, although the case where the position adjustment of the bundle fiber 20 is manually performed has been described here, the position of the bundle fiber 20 can be automatically adjusted so that the output of the photomultiplier tube or the light receiving element 17 is maximized. It is.
The configuration of the present invention can also be applied to a PL mapping measuring device.
Although the case where the two-wavelength excitation PL method is performed using this apparatus has been described here, this apparatus can also be used for other PL measurement methods.

  The micro-PL measuring apparatus of the present invention can be widely used for measuring and evaluating characteristics of various semiconductors including semiconductor light-emitting elements and light-receiving elements, phosphors, and organic light functional elements. .

The top view of the microscope cylinder with a cover of the microscope PL measuring apparatus which concerns on embodiment of this invention The side view of the microscope cylinder with a cover of the microscope PL measuring apparatus which concerns on embodiment of this invention Sectional view of the microscope tube corresponding to FIG. Sectional view of the microscope tube corresponding to FIG. The top view (a) and sectional drawing (b) of the field stop concerning an embodiment of the present invention The figure which shows the four metal thin plates of the field stop which concerns on embodiment of this invention The figure which shows the measurement procedure in the micro PL measurement apparatus which concerns on embodiment of this invention. The figure which shows the PL image (c1-c4) of the PL observation area specified by the epi-illumination image (a), the PL image (b), and the field stop Semiconductor band model diagram Schematic diagram of a measuring device that implements the two-wavelength excitation PL method

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 AGE excitation light source 12 BGE excitation light source 13 Cooling container 14 Sample 15 Microscope cylinder 151 Front side microscope cylinder 152 Back side microscope cylinder 16 Spectrometer 17 Photomultiplier tube or light receiving element 18 Oscilloscope 19 CPU
20 Fiber bundle 21 Filter 30 Field stop 301 Metal thin plate 302 Metal thin plate 303 Metal thin plate 304 Metal thin plate 305 Micrometer 306 Micrometer 307 Micrometer 308 Micrometer 309 Closed space 31 Objective lens 32 Manual revolver 33 Position adjusting means 331 Micrometer 332 Micro Meter 34 CCD camera 36 Illumination optical system 361 Illumination fiber 362 Reflective mirror 37 Optical axis adjusting screw 41 Illumination optical system switching mechanism 411 Handle 412 Half mirror 42 Image observation / PL observation switching mechanism 421 Handle 422 Reflector 43 Imaging optical system 51 X stage 511 X screw 52 Y stage 521 Y screw 53 Z stage 531 Z screw

Claims (6)

An objective lens facing the sample;
A microscope cylinder having the objective lens mounted on one end;
A bundle fiber for guiding the light emitted from the other end of the microscope barrel to the optical analysis means;
Position adjusting means installed at the other end of the microscope barrel in order to adjust the position of the bundle fiber facing the microscope barrel;
The illumination light from the illumination light source incident on the microscope barrel is reflected in the direction of the objective lens at the axial center position of the microscope barrel, reflected by the sample, and incident on the microscope barrel from the objective lens. A half mirror that transmits the reflected light of the illumination light;
Half mirror moving means for moving the half mirror to an axial position of the microscope cylinder and a position deviating from the axial position;
A reflecting mirror that reflects the reflected light of the illumination light transmitted through the half mirror in the direction of the epi-illumination observation means at the axial center position of the microscope cylinder;
Reflecting mirror moving means for moving the reflecting mirror to an axial center position of the microscope cylinder and a position deviating from the axial center position;
An excitation light source of excitation light for exciting the sample;
A field stop installed in the microscope barrel to select an observation region of the sample that is excited by the excitation light and emits photoluminescence;
With
The half mirror, the field stop and the reflecting mirror are arranged in the microscope barrel from one end where the objective lens is mounted in this order toward the other end where the bundle fiber position adjusting means is installed.
When observing the reflected light of the illumination light from the sample with the epi-illumination observation means, the half mirror and the reflecting mirror are placed at the axial center of the microscope cylinder,
When adjusting the facing position of the bundle fiber to the microscope cylinder with the position adjusting means, the half mirror is placed at the axial center position of the microscope cylindrical body, and the reflecting mirror is out of the axial position The position adjustment means adjusts the facing position of the bundle fiber based on the amount of reflected light of the illumination light incident on the bundle fiber ,
When observing the photoluminescence emitted from the specimen, the half-mirror and the reflecting mirror are placed at a position deviated from the axial center position of the microscope cylinder. The microphotoluminescence measuring device according to claim 1 ,
The position adjusting means comprises: a spectroscope that splits the light guided by the bundle fiber as the light analyzing means; and a photomultiplier tube or a light receiving element that converts the light split by the spectroscope into an electrical signal. In the adjustment, the light having the wavelength of the illumination light source is extracted from the light incident on the bundle fiber by the spectrometer, the light is converted into an electric signal by the photomultiplier tube or the light receiving element, and the photoelectrons The microphotoluminescence measuring apparatus, wherein the facing position of the bundle fiber is adjusted so that the output of the multiplier tube or the light receiving element is maximized. The microphotoluminescence measuring device according to claim 1,
The field stop has a plurality of plate members that can move independently along a plane orthogonal to the axis of the microscope cylinder, and is defined by edges of the plurality of plate members. A microphotoluminescence measuring device characterized in that a closed space serves as an optical path. The microphotoluminescence measuring device according to claim 1,
Furthermore, the microscope photoluminescence measuring apparatus, further comprising a moving means for moving the microscope cylinder in the X, Y, and Z directions. The microphotoluminescence measuring device according to claim 1,
The excitation light source includes a first excitation light source that outputs excitation light that is greater than or equal to the forbidden band energy width of the sample, and a second excitation light source that outputs excitation light that is less than or equal to the forbidden band energy width of the sample, A microscope characterized by performing single irradiation of excitation light from the first excitation light source or superimposed irradiation of excitation light from the first excitation light source and the second excitation light source on the observation region of the sample Photoluminescence measuring device. An objective lens facing the sample, a microscope cylinder having the objective lens attached to one end thereof, a bundle fiber for guiding light emitted from the other end of the microscope cylinder to an optical analysis means, and the microscope cylinder of the bundle fiber Position adjusting means installed at the other end of the microscope barrel for adjusting the position facing the body, and illumination light from the illumination light source incident on the microscope barrel at the axial center position of the microscope barrel A half mirror that reflects in the direction of the objective lens, reflects off the sample and transmits the reflected light of the illumination light that enters the microscope barrel from the objective lens, and the half mirror is an axis of the microscope barrel A half mirror moving means that moves to a position deviated from the position and the axial center position, and the reflected light of the illumination light that has passed through the half mirror is reflected by the epi-illumination observation means at the axial center position of the microscope barrel. A reflecting mirror that reflects in the direction, a reflecting mirror moving means that moves the reflecting mirror to an axial center position of the microscope cylinder and a position off the axial center position, an excitation light source of excitation light that excites the sample, A field stop installed in the microscope barrel for selecting an observation region of the sample that is excited by the excitation light and emits photoluminescence, and the half mirror, the field stop, and the reflecting mirror are provided in the microscope. A photoluminescence measurement method for a microphotoluminescence measurement device arranged in a cylinder from one end where the objective lens is attached in this order toward the other end where the bundle fiber position adjusting means is installed,
The half mirror and the reflecting mirror are placed at the axial center of the microscope barrel, and the sample is irradiated with illumination light from an illumination light source incident on the microscope barrel via the half mirror and the objective lens, The reflected illumination observation is performed by guiding the reflected light of the illumination light that is reflected by the sample, enters the microscope barrel from the objective lens, and passes through the half mirror, toward the incident illumination observation means by the reflecting mirror. A first step of observing the surface of the sample with means;
A second step of selecting an observation region of the sample with the field stop;
The half mirror is placed at the axial center position of the microscope cylinder, the reflecting mirror is placed at a position off the axial center position, is reflected by the sample, passes through the half mirror, and passes through the field stop. A third step of setting the position of the bundle fiber facing the microscope cylinder using the position adjusting means so that the amount of reflected light of the illumination light incident on the bundle fiber is maximized; ,
The half mirror and the reflecting mirror are placed at a position deviated from the axial center position of the microscope barrel, and the observation region of the sample is irradiated with excitation light from the excitation light source and emitted from the sample, and the objective lens and the field of view A fourth step of measuring the photoluminescence that has passed through the diaphragm and entered the bundle fiber by guiding it to the optical analysis means;
A photoluminescence measurement method comprising: