WO2013071742A1

WO2013071742A1 - Light-emitting device and projection system

Info

Publication number: WO2013071742A1
Application number: PCT/CN2012/075755
Authority: WO
Inventors: 李屹; 许颜正; 张利利; 胡飞
Original assignee: 深圳市光峰光电技术有限公司
Priority date: 2011-11-15
Filing date: 2012-05-18
Publication date: 2013-05-23
Also published as: CN102540656B; CN102540656A

Abstract

A light-emitting device comprises a first wavelength conversion material layer (104) for absorbing excitation light (101) and emitting hybrid excited light (103) and an optical film (105). The first wavelength conversion material layer has a first surface (104a) and a second surface (104b) opposite to each other, the first surface being used for receiving the excitation light. The first wavelength conversion material layer comprises a first wavelength conversion material (203) for absorbing the excitation light and generating first excited light, and a second wavelength conversion material (204) for absorbing at least part of the first excited light and generating second excited light. The energy conversion efficiency of the first wavelength conversion material is higher than that of the second wavelength conversion material. The optical film is located at a side close to the second surface of the first wavelength conversion material layer, and is used for reflecting the first excited light and the second excited light from the first wavelength conversion material layer. Further disclosed is a projection system comprising the light-emitting system. Compared with use of the first wavelength conversion material or the second wavelength conversion material alone, the light-emitting device disclosed by the present invention can obtain a higher luminous flux of monochromatic light.

Description

Light-emitting device and projection system

Technical field

The present invention relates to the field of optical technologies, and in particular, to a light emitting device and a projection device. Background technique

At present, the white light source used in the projector is mainly UHP (Ultra High Pressure) bulb, which has high brightness, but has a life of only 3,000 hours, and the price of replacing the lamp is expensive, so it cannot meet the demand for long-term use.

The use of semiconductor light sources instead of UHP bulbs is an important technological development. However, in semiconductor light sources, the inefficiency of green light sources has become a major bottleneck. To overcome this problem, it has been proposed to use a blue or ultraviolet semiconductor light source to excite a monochromatic wavelength converting material to produce monochromatic light.

Chinese Patent 200810065225 discloses a method of producing high-intensity fluorescent excited light. In this patent, the wavelength converting material is applied to a thermally conductive light reflecting substrate. After the excitation light excites the wavelength converting material layer to generate the excited light, the light emitted back toward the back side of the excited light is reflected by the light reflecting substrate. When it comes back, it is finally emitted from the incident surface of the excitation light and guided through a spectroscopic filter to form the outgoing light. An advantage of the invention is that the heat generated by the excitation of the wavelength converting material can be conducted away through the thermally conductive light reflecting substrate such that the operating temperature of the wavelength converting material layer is greatly reduced. The invention further provides that a plurality of wavelength converting materials are applied to a thermally conductive reflective disk in a circumferential direction, the disk being fixed to a rotating motor, and wavelength conversion materials of different colors as the motor rotates The light is sequentially excited by the excitation light to produce a sequence of monochromatic light.

In the above scheme, the efficiency of the light source depends on the efficiency of each of the monochromatic lasers. There are two commonly used methods for generating a single-color laser, one is to directly excite the wavelength conversion material of the corresponding color; the other is to excite other wavelength conversion materials to emit laser light, and then filter with a filter. A satisfactory color is obtained by the laser.

For example, in order to generate a single-color red light-receiving laser, a blue-wave excitation light may be used to directly excite the red wavelength conversion material to generate a red light-receiving laser, or a blue-light-excited yellow wavelength conversion material may be used to generate yellow light, and a filter is used to filter out the yellow light. The green light component in the language gets red light.

The specific laser light is shown in Figure 9a. Under the same excitation power, the excited light spectrum of the red wavelength conversion material is 902a, and the excited light spectrum of the yellow wavelength conversion material is 901a. Energy is greater than the energy of red light (the optical energy is the area covered by the light language). This is because The energy conversion efficiency of the yellow wavelength conversion material is higher than that of the red wavelength conversion material. However, yellow light spectrum

The coverage of 901a is approximately 500 nm to 700 nm, and only the spectral components having a wavelength greater than 590 nm correspond to red light. It can be seen that in order to obtain a red light output, it is necessary to filter out components having a wavelength of less than 590 nm in the yellow light spectrum using a filter device. It can be easily seen from the light language that the energy loss of Huang Guangguang in the filtering process is very large. The red light language 902a itself has a lower energy, but most of its energy is concentrated in the wavelength range of more than 590 nm, so the energy loss during the filtration process is H.

The illuminating words of the 901a and red light spectrum 902a filtered by the filtering device are denoted as 901b and 902b in Fig. 9b, respectively. Before filtering, the luminous flux of Huang Guangguang is 4.56 times of the luminous flux of red light. However, after filtering to the same red color coordinate, the luminous flux after filtering is only 11.6% before filtering, and the luminous flux after filtering is filtered. The former 53.4%. Finally, the luminous flux of the red light emitted by the illuminating device based on the two methods is almost the same.

In summary, the above two methods of obtaining a single-color laser are problematic: the advantage of directly using a wavelength-converting material layer of a corresponding color to produce a monochromatic laser is that the color of the laser is close to a satisfactory color, so no need to A satisfactory monochromatic color can be obtained by filtering with a laser; even if filtering is required, the energy loss of the filtered light is not large; but the disadvantage is that the energy conversion efficiency of the wavelength-converting material of the corresponding color is too low. The problem with using wavelength-converting material layers corresponding to other colors that are more efficient is that, due to the large color deviation, most of the energy is lost in the subsequent filtering process, and the luminous flux of the finally filtered monochromatic light is not satisfaction.

Therefore, there is a need for a light-emitting device that can produce a highly efficient single-color laser. Summary of the invention

The main technical problem solved by the present invention is to propose a light-emitting device which can be excited to emit monochromatic light of high luminous flux.

The invention provides a light emitting device, comprising:

a first wavelength converting material layer for absorbing excitation light and emitting a mixed laser beam;

The first wavelength converting material layer includes opposing first and second faces, the first face for receiving the excitation light, and the first wavelength converting material for absorbing the excitation light and generating the first laser, and for absorbing At least partially receiving the second laser and generating the second laser-converted second wavelength converting material; the energy conversion efficiency of the first wavelength converting material is higher than the second wavelength converting material;

An optical film located on a side of the second side of the first wavelength converting material layer for reflection from The first received laser and the second received laser of the first wavelength converting material layer.

The present invention also provides a projection system comprising the above-described illumination device.

Compared with the prior art, the present invention includes the following beneficial effects:

In the present invention, the first wavelength converting material is used together with the second wavelength converting material to form the first wavelength converting material layer such that the luminous flux of the excited light of the first wavelength converting material layer is higher than that of the first and second wavelengths used alone. The luminous flux of the monochromatic excited light generated by the material; at the same time, the invention can also realize the laser with high efficiency and high color rendering index. DRAWINGS

1 is a schematic structural view of a first embodiment of a light-emitting device of the present invention;

2a and 2b are schematic diagrams showing a density distribution of a wavelength converting material in a first wavelength converting material layer. FIG. 3 is a schematic structural view showing a third embodiment of the light emitting device of the present invention;

Figure 4a is a schematic structural view of a fourth embodiment of the light-emitting device of the present invention;

4b and 4c are side views of a first wavelength converting material layer and an optical film in a fourth embodiment of the light emitting device of the present invention;

Figure 5 is a schematic view showing the structure of a fifth embodiment of the light-emitting device of the present invention;

Figure 6 is a schematic view showing the structure of a sixth embodiment of the light-emitting device of the present invention;

Figure 7 is a schematic structural view of a seventh embodiment of the light-emitting device of the present invention;

Figure 8 is a schematic structural view of an eighth embodiment of the light-emitting device of the present invention;

Figure 8a is a plan view showing a specific representation of the wavelength conversion material layer and the second filter in the embodiment shown in Figure 8;

Figure 8b is a plan view showing another specific representation of the wavelength conversion material layer and the second filter in the embodiment shown in Figure 8;

Figure 9a is the excited light spectrum of the yellow wavelength conversion material and the red wavelength conversion material; Figure % is the optical language of the yellow wavelength conversion material and the red wavelength conversion material after the excitation light passes through the filter device;

Figure 10 is a spectrum emitted by the application of the present invention.

detailed description According to the data in the background art, it is conventionally inferred that the two methods of producing a single-color laser are unsatisfactory, and the use of the two methods together does not contribute to the improvement of the brightness of the monochromatic light. However, the inventors have found through experiments that combining two wavelength converting materials results in a monochromatic light output with a larger luminous flux. Based on the experimental data of the inventors, the present invention proposes a light-emitting device that solves the problem that the luminous flux of the stimulated emission monochromatic light of the wavelength conversion material layer is not high.

An optical device of the present invention has an optical structure as shown in FIG. The illuminating device comprises an excitation light source (not shown) for emitting excitation light 101; a first wavelength conversion material layer for absorbing excitation light 101 and emitting hybrid laser light 103. The first wavelength converting material layer 104 includes opposing first and second faces 104a, 104b, wherein the first face 104a is for receiving the excitation light 101.

In the present invention, the excitation light source refers to a semiconductor light source capable of emitting a wavelength conversion material, including blue light and ultraviolet light, such as a blue LED (Light Emitting Diode) light source and a blue light LD (Laser Diode). Diode) light source; wavelength conversion material refers to a material that can absorb the excitation light emitted by the excitation source and is stimulated to emit a laser with a wavelength different from that of the excitation light, including phosphors, quantum dots, and the like.

The first wavelength converting material layer 104 includes a first wavelength converting material for absorbing the excitation light 101 and generating a first received laser light, and a second wavelength converting material for absorbing at least a portion of the first received laser light and generating a second received laser light. The energy conversion efficiency of the first wavelength converting material is higher than that of the second wavelength converting material.

In the present invention, the energy conversion efficiency E of the wavelength converting material is calculated by:

E:丄 p

Upper 0 - P ¹ 1

Wherein P _Q refers to the excitation light energy incident on the wavelength conversion material, and Pi refers to the energy of the laser light excitedly emitted by the wavelength conversion material after being irradiated by the excitation light, which means that the excitation light is not absorbed by the wavelength conversion material. The remaining energy.

For the sake of convenience, the efficiency of the wavelength converting material mentioned hereinafter refers to its energy conversion efficiency.

In this embodiment, the density distribution of the two wavelength-interchangeable materials in the first wavelength converting material layer is as shown in Fig. 2a. In FIG. 2a, in the first wavelength conversion material layer 104, a first wavelength conversion material sub-layer 203 and a second wavelength conversion material sub-layer 204 are disposed in a stacked manner, and the first wavelength conversion material sub-layer 203 includes only the first wavelength. The conversion material 201, the second wavelength conversion material sub-layer 204 includes only the second wavelength conversion material 202. In the present embodiment, the first wavelength converting material 201 is at the first wavelength converting material sub-layer 203. The internal density distribution is substantially uniform, and the density distribution of the second wavelength converting material 202 inside the second wavelength converting material sub-layer 204 is substantially uniform, and the curves 206 and 207 represent the first wavelength converting material particles 201, respectively. And the density distribution of the second wavelength converting material particles 202 as a function of thickness.

In the embodiment illustrated in Figure 2a, the first wavelength converting material sub-layer is in intimate contact with the second wavelength converting material sub-layer. In practical applications, there may be an air gap between the first wavelength converting material sublayer and the second wavelength converting material sublayer.

The embodiment further includes an optical film 105 on a side adjacent to the second face 104b of the first wavelength converting material layer 104 for reflecting the first received laser light and the second received laser light from the first wavelength converting material layer. In particular, the optical film can be a mirror or an interference filter. In this embodiment, the optical film is a mirror for all of the light from the first layer of wavelength converting material. Preferably, the reflecting surface of the mirror is a surface of the mirror that is closer to the first wavelength converting material layer.

In the present embodiment, the second wavelength converting material sub-layer 204 is disposed between the first wavelength converting material sub-layer 203 and the optical film. Therefore, the excitation light 101 is incident on the first wavelength conversion sub-layer 203 first. The first wavelength converting material 201 in the first wavelength converting material sub-layer 203 absorbs most of the energy of the incident excitation light and emits the first received laser light. The first received laser includes a first portion and a second portion, the first portion is directly emitted from the first wavelength conversion material sublayer into the external space, and the remaining second portion is incident to the second wavelength conversion material sublayer, the second portion Most of the energy is absorbed by the second wavelength converting material sublayer and is excited to emit a second laser. A portion of the second received laser light exits the outer space through the first wavelength conversion material sub-layer, and another portion is incident on the reflective surface of the mirror and is reflected back, and finally passes through the second wavelength conversion sub-layer and A wavelength conversion sublayer exits into the external space.

In summary, the mixing of the first wavelength converting material layer is composed of the laser 103, the first received laser light directly discharged, the first received laser light and the second received laser light not absorbed by the second wavelength converting material, covering a relatively wide width. The spectral width.

Experiments have shown that the luminous flux of the monochromatic laser light obtained by applying the light-emitting device of the present embodiment is significantly improved than the luminous flux of the single-color laser light of the same color obtained by directly using the second wavelength converting material alone. Still take the red laser as an example. In the experiment, the first wavelength converting material is a yellow wavelength converting material. Preferably, the yellow wavelength converting material is a 4 aluminum garnet phosphor having a molecular formula of Y ₃ A1 ₅ 0 ₁₂ (YAG ); the second wavelength converting material It is a red phosphor; in the yellow light emitted by the yellow phosphor, the optical components of 480 to 580 nm are absorbed by the red phosphor to varying degrees. The specific experimental data is shown in FIG. 10, and the mixed laser light obtained by using the light-emitting device of the present embodiment is filtered. The red light obtained by the filtering is 1001 by the laser light, and the luminous flux of the same color obtained by the method of directly using the red wavelength converting material alone is 24% higher than that of the laser.

The reason why the light-emitting device of the present invention can effectively increase the luminous flux of the monochromatic laser light is as follows: 1. The wavelength conversion process of the three components of the laser light 103 generated by the mixing of the first wavelength conversion layer is high efficiency; Two are subject to laser components.

Specifically, the first received laser light directly emitted and the first received laser light absorbed by the second wavelength converting material are stimulated to be emitted by the high efficiency first wavelength converting material, so that the wavelength conversion process is highly efficient. . While the second excited light is emitted by the second wavelength converting material, the energy incident on the second wavelength converting material is greatly reduced compared to the energy of the excitation light 101, and is excited according to the general characteristics of the wavelength converting material. The reduction in energy is necessarily accompanied by an increase in energy conversion efficiency.

In summary, the conversion efficiency of the present invention is greatly improved compared to the scheme of using the second wavelength conversion material alone; while the present invention has similar conversion efficiency compared to the scheme using the first wavelength conversion material alone, The hybrid laser 103 of the present invention further includes a second laser-receiving component, so the energy loss during the filtration process is much smaller.

According to the above analysis, there are two necessary conditions for the above beneficial effects: 1. The energy conversion efficiency of the first wavelength converting material is higher than that of the second wavelength converting material; 2. The second wavelength converting material absorbs the first wavelength converting material to be excited. At least a portion of the energy of the first laser is emitted.

In a second embodiment of the present invention, unlike the first embodiment, the position of the first wavelength converting material layer and the second wavelength converting material layer are reversed, that is, the excitation light 101 is incident on the second wavelength converting material layer. The first wavelength converting material layer is adjacent to the mirror 105. In this embodiment, the second wavelength converting material is required to also absorb the excitation light 101 and generate a second received laser light. In this case, the second laser is divided into two parts, the first part is that the second wavelength converting material is excited by the excitation light 101, and the second part is that the second wavelength converting material is excited by the first laser, wherein the first part The second laser-induced excitation process is inefficient, but the second portion of the second laser-excited excitation process remains highly efficient. At the same time, since the excitation light 101 first passes through the second wavelength converting material, the energy of the excitation light received by the first wavelength converting material is lowered, and thus the energy of the first received laser light is lowered.

In summary, the hybrid laser light that is finally emitted in this embodiment has the same three components as the first embodiment, but the ratio of the three components varies: two generated by the first wavelength conversion material. The proportion of the components is reduced, and the proportion of the second laser is increased. The luminous flux of the monochromatic laser light generated by the present embodiment is relatively small compared to the first embodiment due to the presence of a component of low efficiency conversion in the second laser light. Reduced. The experimental data at this time is as shown by 1002 in FIG. 10, and the luminous flux of the same color obtained by the method of directly using the red wavelength converting material alone is 17% higher than that of the laser light.

As can be seen from the above two embodiments, in the first wavelength converting material layer, there is a preferred embodiment of the relative positional relationship of the first wavelength converting material and the second wavelength converting material. From the current experimental results, the second wavelength converting material sublayer is adjacent to the mirror, and the first wavelength converting material sublayer is attached to the second wavelength converting material sublayer is a more preferable solution. However, regardless of the positional relationship between the two, as long as the hybrid laser 103 is composed of the above three kinds of light components, the luminous flux of the final monochromatic light is improved.

Experiments have shown that the first wavelength converting material and the second wavelength converting material are mixed together and evenly distributed inside the first wavelength converting material layer, and the final effect is between the above two experimental results.

In the above description of the invention, an example of generating a red-receiving laser is used, wherein the first wavelength converting material is a yellow wavelength converting material and the second wavelength converting material is a red wavelength converting material. In fact, it is subject to laser light. For example, the first wavelength converting material may be a cyan phosphor, a green phosphor or a yellow-green phosphor, and the second wavelength converting material may also be an orange phosphor, an amber phosphor or the like.

In the above description of the invention, the purpose of the illuminating device is to emit a single-color laser, such as a red laser. In fact, the present invention is also applicable to the production of mixed light, i.e., the mixed laser light 103 in this embodiment. As described above, the three-part laser light contained in the hybrid laser is generated by a highly efficient excited light process, and the energy conversion efficiency is similar to that of the first wavelength conversion material, and since it has the second laser-receiving The composition thus has a wider vocabulary and a better color rendering index than the first laser.

In addition to the density distributions of several of the above two wavelength converting materials, the density distribution of the first wavelength converting material and the second wavelength converting material may have other variations, as shown in Figures 2b and 2c.

As shown in FIG. 2b, in the first wavelength conversion material layer, the density distribution of the first wavelength conversion material and the second wavelength conversion material changes in a gradient or continuously along the direction from the first surface 104a to the second surface 104b. . Taking a continuous variation as an example, the density distribution of the first wavelength converting material particles gradually decreases in a direction from the first surface 104a to the second surface 104b as shown by a curve 208; and the density distribution edge of the second wavelength converting material particles The direction gradually increases from the first face 104a to the second face 104b as shown by the curve 209.

The light emitting device proposed by the present invention further includes a light extracting device. a light extraction device is located on a side close to the first surface of the first wavelength conversion material layer for guiding the excitation light to be incident on the first surface by the incident light path, At the same time, the light from the first wavelength converting material layer is guided out by the outgoing light path, and the outgoing light path is separated from the incident light path.

Specifically, in the embodiment shown in Fig. 1, the light extraction means refers to the spectral filter 102. The spectral filter 102 transmits the excitation light 101 and reflects the mixture by the laser light 103 into the outgoing optical path in a reflective manner.

As described above, if it is desired to obtain a monochromatic laser light, it is necessary to filter the unnecessary optical components in the spectrum of the laser light 103 by using a filter device, and in the present embodiment, the spectral filter 102 is realized. At the same time as the function of the light extraction device, the function of the filter device can also be realized, that is, the spectral filter 102 reflects and mixes the spectral components required in the laser light 103 and guides them into the outgoing light path while transmitting the mixed laser light 103. Unnecessary optical components make it impossible to enter the exit path. For example, for a red laser, the required spectral component refers to a gamma component of 580 to 600 nm, and the remaining optical components are unwanted spectral components. Thus, the spectroscopic filter 102 can achieve the filtering function for the mixed laser light 103 by partially reflecting the mixed laser light 103.

In practical applications, the spectral filter can also be reflected by the excitation light and the hybrid laser 103 can be guided into the exit optical path in a transmissive manner. Similarly, in this case, the filtering of the emitted light can be realized by the design of the spectral filter to achieve a satisfactory color; at this time, the spectral filter guides the mixed laser 103 into the outgoing light in a partially transmissive manner. road.

In the above embodiment, the spectroscopic filter 102 functions as a spectroscopic filter while also functioning as a filter mixture. In fact, other methods can be used to achieve the effect of filtering out the emitted light to achieve a satisfactory color. A third embodiment of the present invention is shown in Fig. 3. Different from the first embodiment, the embodiment further includes a first filter 301 stacked on the first face 104a of the first wavelength converting material layer 104 for transmitting the excitation light while transmitting the first wavelength conversion portion. The layer is excited to emit a mixture of laser light and reflects other light. Since the hybrid laser has a relatively wide spectral component, if it is desired that the illuminating device emits only a part of the predetermined spectral components, the first filter can be set to transmit only the predetermined optical component and reflect the remaining optical components. Only the light 303 of the predetermined optical component can pass through the first filter and enter the exiting optical path.

In practical applications, more preferably, there is an air gap between the first filter and the first wavelength converting material layer, which can reduce the design difficulty of the first filter. The most common means of implementing the first filter is to use an interference filter. The interference filter is a thin film of high-low refractive index medium alternately sputtered on a transparent substrate, and the interference of light in the film is used to achieve transmission or reflection of the characteristic wavelength to achieve filtering. Function. When the interference filter is used as the first filter, the surface of the coated film faces the first wavelength conversion material layer

104 is closely adjacent to it.

In the foregoing three embodiments, the first wavelength converting material layer is stationary. In this case, when the power of the excitation light is large, the first wavelength conversion material layer emits a large amount of thermal energy while being excited, and the temperature of the first wavelength conversion material layer is rapidly increased, which further The energy conversion efficiency of the wavelength conversion material is reduced, and the heat released is further increased, thereby evolving into a vicious cycle, and finally the wavelength conversion material is thermally quenched due to excessive temperature.

If the wavelength conversion material and the excitation light are relatively moved, the wavelength conversion material rapidly rises at a moment when the wavelength conversion material moves to the excitation light irradiation range, and once moved away from the range of the excitation light irradiation, the temperature of the wavelength conversion material is Rapidly lowering, eventually, with the constant relative motion of the wavelength converting material and the excitation light, the temperature of each wavelength converting material that operates in an excited state at a moment is in a normal operating temperature range.

A fourth embodiment of the invention is shown in Figure 4a. Different from the first embodiment, the first wavelength converting material layer 404 is stacked and relatively fixed on the optical film 405. Meanwhile, the embodiment further includes a driving device 401 for driving the optical film 405 to be excited. The light 101 is in relative motion with the first wavelength converting material layer 404.

There are a number of ways in which the first layer of wavelength converting material 404 can be stacked and relatively fixed to the optical film 405. For example, the wavelength conversion material and the transparent binder are directly mixed and applied to the optical film 405, and the first wavelength conversion material layer formed after curing is bonded to the optical film; or a transparent material substrate, for example, After the glass substrate is pressed together, the optical film 405 and the transparent material substrate are bonded together by an adhesive to form an integrated structure.

In this embodiment, the driving device can be a rotatable motor that drives the first wavelength converting material layer 404 and the optical film 405 to rotate about the rotating shaft. The outer shape of the first wavelength converting material layer 404 and the optical film 405 are each formed into a circular shape, as shown in FIG. 4b, such that the first wavelength converting material layer 404 is different on the same circumference as the motor rotates. The position is excited to be excited by the excitation light, thereby achieving stable light output of the excited light.

In practical applications, the continuous output of polychromatic light can also be realized by the method in the fourth embodiment. In a variation of this embodiment, the second wavelength conversion material layer or the astigmatism layer is further disposed on the optical film in parallel with the first wavelength conversion material layer, so that the second wavelength conversion material layer or the astigmatism layer and the first The wavelength conversion layer is alternately illuminated by the excitation light. Specifically, as shown in FIG. 4c, the second wavelength converting material layer 406a and the astigmatism layer 406b and the first wavelength converting material layer 404 are juxtaposed and fixed on the optical film 405 in the circumferential direction, and are rotated in turn according to the rotation of the motor. Excitation light illumination. In a preferred case, the first wavelength converting material layer 404 is excited to generate red light, the second wavelength converting material layer 406a is excited to generate green light, and the astigmatism layer 406b scatters and reflects the blue excitation light to generate blue light. With the rotation of the motor, a multi-color light sequence of red, green and blue can be obtained.

In practical applications, the third and fourth embodiments of the present invention can be used in combination, that is, the first filter is stacked and relatively fixed to the first surface of the first wavelength conversion material layer, and driven by a driving device. A wavelength conversion material layer and the first filter move relative to the excitation light. There are various methods for stacking the first filter and relatively fixing it to the first wavelength converting material layer, such as bonding or mechanical fixing; this is a conventional technique and will not be described here.

In the above four embodiments, the light extraction means uses a spectroscopic filter. Actually, there are various forms of light extracting means in practical applications, and the following are respectively exemplified by the fifth to seventh embodiments, respectively.

The optical structure of the fifth embodiment of the present invention is shown in Fig. 5. The present embodiment differs from the first embodiment in that the light extraction device includes a curved reflecting device 502 having a light passing hole 502a; the excitation light 501 from the excitation light source is incident on the first wavelength converting material layer through the light passing hole 502a. 504. The reflecting surface of the arc reflecting means 502 faces the first wavelength converting material layer 504, which reflects the mixed laser light 503 from the first wavelength converting layer 504 to be emitted from the outgoing light path. Also included in this embodiment is a light collecting device 506 that includes an inlet for receiving the outgoing light of the outgoing light path.

Specifically, the camber reflecting device 502 may be hemispherical, the first wavelength converting material layer 504 is located at a first point adjacent to the hemisphere center; the entrance of the light collecting device 506 is located adjacent to the hemisphere center Two points, the first point and the second point are symmetric about the center of the ball.

More preferably, the camber reflecting device 502 is semi-ellipsoidal, the first wavelength converting material layer 504 is located at the first focus of the semi-ellipsoid; the entrance of the light collecting device is located at the second focus of the semi-ellipsoid .

In this embodiment, the light collecting device is a cylindrical square bar. In practical applications, a tapered square bar or a lens may also be used as the light collecting device, which is well known in the art and will not be described again.

In this embodiment, a more preferred solution further includes providing a filter member 507 on the light-passing hole 502a, the filter member transmitting the excitation light and reflecting the mixed laser light, which avoids mixing the excited light from the pass. The exit of the light hole 502a causes waste.

The optical structure of the sixth embodiment of the present invention is shown in Fig. 6. The difference between this embodiment and the first embodiment is that the light extraction device comprises a first planar reflection device 602 with a light-passing aperture 602a, and the excitation light 601 from the excitation light source is incident on the first wavelength conversion material through the light-passing aperture 602a. Layer 604. The reflective surface of the first planar reflecting means 602 faces the first wavelength converting material layer 604 and reflects the mixed received laser light 603 from the first wavelength converting layer 604 to be emitted from the outgoing optical path.

The optical structure of the seventh embodiment of the present invention is shown in Fig. 7. The present embodiment differs from the first embodiment in that the light extraction device includes a second planar reflection device 702, and the excitation light 701 from the excitation light source is reflected by the second planar reflection device 702 and incident on the first wavelength conversion material layer 704. The mixed laser light 703 emitted by the first wavelength conversion layer is emitted around the second planar reflection device 702 and is emitted by the outgoing light path.

In the sixth and seventh embodiments described above, the divergence angle of the excited light emitted by the first wavelength conversion layer is much larger than the divergence angle of the incident excitation light, and the optical paths of the two are separated.

Compared with the first embodiment, the first filter and the driving device described in the second and third embodiments function to improve the performance of the first wavelength converting material layer, while the fifth to seventh embodiments describe different The optical structures of the light extraction devices, which are respectively two aspects of the invention, are independent of one another and can therefore be freely combined. That is, in the fifth to seventh embodiments of the present invention, the first filter as described in the second embodiment may be applied, or the driving device as described in the third embodiment may be applied, The first filter and the driving device can be applied simultaneously.

For the optical structure of the fifth embodiment of the present invention shown in Fig. 5, there is another filter mode for filtering out the emitted light to achieve a satisfactory color, which will be explained as an eighth embodiment of the present invention.

In the eighth embodiment, the second filter is further included, the second filter is placed on the entrance light path of the light collecting device, or the second filter is placed on the exit light path of the light collecting device, or the second filter The light sheet is placed on the optical path inside the light collecting device for reflecting the excitation light and transmitting the mixed laser light. Similar to the first filter, the second filter can also effect filtering of the hybrid laser, where the second filter reflects the excitation light and partially transmits the mixed laser.

Similarly, in the eighth embodiment, the first light-wavelength converting material layer may also move relative to the excitation light to reduce the local heat generation of the wavelength converting material. In this embodiment, the first wavelength converting material layer is laminated and fixed on the optical film, and the optical film and the second filter are relatively fixed. The embodiment further includes a driving device for driving the optical film to make the excitation light and the first wavelength conversion material layer And a relative movement of the second filter, and when the first layer of wavelength converting material moves to be illuminated by the excitation light, the second filter moves to the entrance light path of the light collecting device, or the second filter moves to the light collecting The exit light path of the device, or the second filter, moves to the optical path inside the light collecting device.

The specific optical structure of this embodiment is shown in FIG. In the present embodiment, the first wavelength converting material layer 804 is laminated and fixed on the optical film 805, and the optical film 805 and the second filter 807 are relatively fixed. The embodiment further includes a driving device for driving the optical film 805 to cause the excitation light 801 to move relative to the first wavelength converting material layer 804 and the second filter 807, and to be the first wavelength converting material. When layer 804 is moved to be illuminated by excitation light 801, second filter 807 is moved to the entrance light path of light collecting device 806 for reflecting excitation light and transmitting or partially transmitting mixed received laser light 803. The excitation light reflected by the second filter can be reflected back to the first wavelength converting material layer by the arc reflecting means 802 to form a secondary excitation, which further enhances the luminance of the light emitting device. In addition, by partially transmitting and mixing the laser light 803, it is possible to filter out the unnecessary optical energy of the laser light 803, thereby improving the color of the output light.

There are a number of ways to relatively fix the second filter 807 and the optical film 805, for example by glue bonding at the point of contact, or by mechanically clamping the two and relatively fixed. This is a well-known technique and will not be described again.

Similar to the fifth embodiment, in the embodiment, the driving device may be a rotatable motor that drives the first wavelength conversion material layer 804, the optical film 805 and the first filter 807 to rotate around the rotation axis. . The outer shape of the first wavelength converting material layer 804, the optical film 805 and the first filter 807 are all formed into a circular shape as shown in FIG. 8a; the first wavelength converting material layer 804 is the same as the motor rotates. Different positions on the circumference are excited to be excited by the excitation light, thereby achieving stable light output of the excited light.

Similar to the fifth embodiment, in this embodiment, the second wavelength conversion material layer or the astigmatism layer may be further disposed on the optical film in parallel with the first wavelength conversion material layer, so that the second wavelength conversion material is The layer or the astigmatism layer is irradiated with the excitation light by the first wavelength conversion layer; further comprising a third filter corresponding to the added second wavelength conversion material or the astigmatism layer, and the second filter is stacked and fixed in parallel On the optical film.

Specifically, as shown in FIG. 8b, the second wavelength converting material layer 804a, the astigmatism layer 804b, and the first wavelength converting material layer 804c are juxtaposed and fixed on the optical film 805 in the circumferential direction, and are rotated in turn according to the rotation of the motor. Excitation light illumination. As a preferred case, when the excitation light is blue light, the first wavelength The conversion material layer 804c is excited to generate red light, the second wavelength conversion material layer 804a is excited to generate green light, and the astigmatism layer 804b scatters and reflects the incident blue excitation light. Each length of the wavelength conversion material layer or the astigmatism layer corresponds to a respective second filter. For example, the first wavelength converting material layer 804c corresponds to the red light second filter 807c, and when the first wavelength converting material layer 804c is moved to be illuminated by the excitation light 801, the second color filter 807c moves to the light collecting device 806. The entrance light path is used to reflect the excitation light and partially transmit the mixed laser light 803 to achieve a good color red light output. At the same time, the second wavelength converting material layer 804a corresponds to the green second filter 807a, and the astigmatism layer 804b corresponds to the blue second filter 807b. Thus, as the motor rotates, a red, green, and blue multicolor light sequence can be obtained.

It is worth noting that not all color segments require a corresponding second filter. For example, in the preferred embodiment of the embodiment, the color of the blue excitation light is already good, and there is no need to pass the second filter to filter out unwanted optical components. One solution at this time is to remove the blue second filter 807b directly, but due to the imbalance of the mass, the motor generates a large noise during the rotation, and the life of the motor is greatly shortened. Although the problem of balancing can be solved by other means, a more preferable method is to make the blue second filter 807b a transparent glass piece or a transparent glass plate coated with an anti-reflection film so that it does not filter blue light. .

In the fifth to eighth embodiments, unlike the first embodiment, the components of the laser light in addition to the three components of the hybrid laser light in the first embodiment include the components of the excitation light because The excitation light reflected by the first wavelength converting material layer in the fifth to eighth embodiments is also guided into the outgoing light path. In the fifth to eighth embodiments, the first or second described above may be used to filter out, but actually, when the excitation light is blue light, it may not be filtered out to be mixed with a plurality of spectral components. High efficiency white light is achieved by the laser together.

The present invention also provides a projection apparatus comprising the illumination apparatus described in the above embodiments.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the specification and the drawings of the present invention may be directly or indirectly applied to other related technologies. The scope of the invention is included in the scope of patent protection of the present invention.

Claims

A lighting device characterized by:

The first wavelength conversion material layer includes opposing first and second faces, the first face for receiving the excitation light, and further comprising a first wavelength conversion for absorbing the excitation light and generating a first laser beam a material, and a second wavelength converting material for absorbing at least a portion of the first laser and generating a second laser; the energy conversion efficiency of the first wavelength converting material is higher than the second wavelength converting material; an optical film, a side of the second face adjacent to the first wavelength converting material layer for reflecting the first received laser light and the second received laser light from the first wavelength converting material layer.

2. The light emitting device according to claim 1, wherein: said second wavelength converting material is also absorbing said excitation light and generating said second received laser light.

3. A light emitting device according to claim 1, wherein: said optical film is a mirror for reflecting all light from said first layer of wavelength converting material.

4. The illumination device of claim 1 wherein:

The first wavelength conversion material layer includes a first wavelength conversion material sublayer and a second wavelength conversion material sublayer disposed in a stack, and the first wavelength conversion material sublayer includes only the first wavelength conversion material, and the second wavelength conversion material The sublayer contains only the second wavelength converting material.

5. The illumination device of claim 4, wherein:

The second wavelength conversion material sublayer is disposed between the first wavelength conversion material sublayer and the optical film.

6. A light emitting device according to claim 4, wherein:

The first wavelength converting material sublayer and the second wavelength converting material sublayer are in close contact with each other or have an air gap.

7. The illumination device of claim 1 wherein:

The first wavelength converting material and the second wavelength converting material are both hooked inside the first wavelength converting material layer.

8. The illumination device of claim 1 wherein:

In the first wavelength converting material layer, the density distribution of the first wavelength converting material and the second wavelength converting material changes in a gradient along a direction from the first surface to the second surface.

9. The illumination device of claim 1 wherein:

Also included is a light extraction device located on a side adjacent to the first side of the first layer of wavelength converting material, The excitation light is guided to the first surface by the incident optical path, and the light from the first wavelength conversion material layer is guided to be emitted from the exit optical path, and the outgoing optical path is separated from the incident optical path.

A lighting device according to claim 9, wherein:

The light extraction device includes a spectroscopic filter that transmits the excitation light to the exiting optical path in a reflective or partially reflective manner, or the spectroscopic filter The mixing is reflected by the excitation light and transmitted in a transmitted or partially transmissive manner into the exiting optical path.

A lighting device according to claim 9, wherein:

The light extraction device includes a curved surface reflecting device with a light passing hole, and excitation light from the excitation light source is incident on the first wavelength conversion material layer through the light passing hole;

a reflecting surface of the curved reflecting device facing the first wavelength converting material layer, the reflecting surface reflecting light from the wavelength converting layer to be emitted from the outgoing light path;

Also included is a light collecting device that includes an inlet for receiving the outgoing light of the exiting light path.

The illumination device of claim 11 wherein:

The arc reflecting device is hemispherical, the first wavelength converting material layer is located at a first point adjacent to the hemisphere center; the entrance of the light collecting device is located at a second point adjacent to the hemisphere center The first point and the second point are symmetric about the center of the sphere.

The illumination device of claim 11 wherein:

The arc reflecting means is semi-ellipsoidal, the first wavelength converting material layer is located at a first focus of the semi-ellipsoid; and the entrance of the light collecting means is located at a second focus of the semi-ellipsoid. The illumination device of claim 11 wherein:

The light collecting device comprises a cylindrical square rod, a tapered square rod or a lens.

The illumination device of claim 11 wherein:

A filter member is disposed on the light passing hole, and the filter member transmits the excitation light and reflects the mixed received laser light.

A lighting device according to claim 9, wherein:

The light extraction device includes a first planar reflecting device with a light passing hole through which excitation light from the excitation light source is incident to the first wavelength converting material layer;

a reflecting surface of the planar reflecting device faces the first wavelength conversion material layer, and the reflecting surface reflects Light from the first wavelength converting layer is emitted from the exiting optical path.

A lighting device according to claim 9, wherein:

The light extraction device includes a second planar reflection device, and the excitation light from the excitation light source is reflected by the second planar reflection device and then incident on the first wavelength conversion material layer; the light emitted by the first wavelength conversion layer is via The second planar reflecting device is emitted around and exits by the outgoing optical path. A light-emitting device according to any one of claims 1 to 17, wherein:

a first filter, the first filter being stacked on a first side of the first layer of wavelength converting material;

The first filter transmits the excitation light and a portion of the mixture is subjected to laser light and reflects other light.

A light emitting device according to claim 18, wherein:

The first filter is an interference filter, and the filter-forming surface faces the first wavelength conversion material layer and is closely adjacent thereto.

A light-emitting device according to any one of claims 1 to 17, wherein:

The first wavelength converting material is stacked and fixed on the optical film;

The light emitting device further includes a driving device for driving the optical film to cause relative movement of the excitation light and the first wavelength converting material layer.

A light emitting device according to claim 20, wherein:

The light emitting device further includes a second wavelength conversion material layer or an astigmatism layer, and the first wavelength conversion material layer is juxtaposed and fixed on the optical film, such that the second wavelength conversion material layer or the astigmatism layer The first wavelength conversion layer is alternately illuminated by the excitation light.

The illumination device of claim 11 wherein:

The light emitting device further includes a second filter for reflecting excitation light and transmitting or partially transmitting the mixed laser light, the second filter being placed on an entrance optical path of the light collecting device, or The second filter is placed on the exit optical path of the light collecting device, or the second filter is placed on the optical path inside the light collecting device.

The illumination device of claim 11 wherein:

The light emitting device further includes a second filter for reflecting excitation light and transmitting or partially transmitting the mixed laser light, the first wavelength conversion material layer being laminated and fixed on the optical film, the optical film The sheet is relatively fixed to the second filter;

The light emitting device further includes a driving device for driving the optical film to The excitation light is relatively moved with the first wavelength conversion material layer and the second filter, and when the first wavelength conversion material layer is moved to be illuminated by the excitation light, the second filter Moving the light sheet to the entrance light path of the light collecting device, or moving the second filter to the exit light path of the light collecting device, or moving the second filter to the inside of the light collecting device The light path.

24. A light emitting device according to claim 23, wherein:

The light emitting device further includes a third wavelength conversion material layer or an astigmatism layer, and the first wavelength conversion material layer is juxtaposed and fixed on the optical film, such that the third wavelength conversion material layer or the astigmatism layer The first wavelength conversion layer is alternately illuminated by the excitation light.

25. The illumination device of claim 1 wherein:

The second wavelength converting material is an orange light or a red light wavelength converting material, and the second received laser light is orange light or red light.

26. The illumination device of claim 1 wherein:

The first wavelength converting material is a yellow-green light or a yellow light wavelength converting material, and the first received laser light is yellow-green light or yellow light.

27. A lighting device as claimed in claim 26, wherein:

The first wavelength converting material is yttrium aluminum garnet Y ₃ A1 ₅ 0 ₁₂ , YAG phosphor.

A projection system, comprising: the light-emitting device according to any one of claims 1 to 27.