TW201500002A - Color tunable dual-wavelength light source structure for plant growth - Google Patents

Abstract

A color tunable dual-wavelength light source structure for plant growth is disclosed. The color tunable dual-wavelength light source structure comprises a blue-emission device, a transparent substrate separable disposed on the blue-emission device, and a color conversion layer disposed on the transparent. The blue-emission device has a blue-light element and an encapsulation layer surrounding the blue-light element for emitting a blue light with the wavelength in the range of 430 nm to 460 nm. The color conversion layer converses part of the blue light into a red light with the wavelength in the range of 640 nm to 660 nm. The conversion layer and the blue-light element are disposed on the opposite sides of the encapsulation layer respectively. The ratio of the intensities of the red light and the blue light is positive correlation with the thickness of the color conversion layer.

Description

Adjustable dual-band light source structure applicable to plant growth

The invention relates to a light source structure, in particular to an adjustable dual-band light source structure applicable to plant growth.

The photosynthesis light absorbed by plants in the visible light range accounts for 60% to 65% of the physiological radiation energy. The artificial light sources currently used for plant growth are mainly deep blue light in the 450 nm band and deep red in the 660 nm band. Light. Among them, because different wavelengths of light source have different effects on the growth of plants, red light and blue light of different proportions are required as the light source in various stages of plant growth.

At present, a commonly used method is to directly arrange a 450 nm band blue light emitting element and a 660 band red light emitting element, and control the number of red light emitting elements and blue light emitting elements to obtain a desired light source. In another method, the light intensity of the red light-emitting element and the blue light-emitting element is separately controlled by an external circuit, and the desired light source can also be obtained. However, both of these methods require separate control of the blue light-emitting element and the red light-emitting element, which will greatly deplete the power. In addition, since the blue light-emitting element and the red light-emitting element are arranged in a direct array, the chromaticity cannot be uniformly distributed due to the problem of the scattering angle.

In addition, another conventional method is to integrate the blue light material and the red light material into the thin film element in a doping manner. However, such a method needs to be made using a trace amount of doping, thereby limiting the fabrication yield of the light-emitting element. Moreover, since the red light material and the blue light material are integrated in the same component, the user cannot immediately control the intensity of the red light and the blue light.

In view of the above-mentioned problems of the prior art, one of the objects of the present invention is to provide an adjustable dual-band light source structure applicable to plant growth, which has excellent chroma by means of a blue light component with a replaceable color conversion layer. A uniform dual-band source that controls the intensity ratio of blue to red light quickly and instantly under a single source.

Therefore, in order to achieve the above object, the present invention provides an adjustable dual-band light source structure applicable to plant growth, comprising at least: a blue light emitting device having a blue component and an encapsulation layer surrounding the blue component, and the blue component is emitted a blue light having a wavelength between 430 nm and 460 nm; a light-transmissive substrate detachably disposed on the blue light-emitting device; and a color conversion layer on the light-transmitting substrate, wherein the color conversion layer and the blue light element are respectively located The encapsulating layer is opposite to the two sides, and the color conversion layer converts the blue light to a red light having a wavelength between 640 nm and 660 nm, wherein the red light and the blue light intensity ratio are positively correlated with the color conversion layer. thickness.

Therefore, one of the features of the adjustable dual-band light source structure of the present invention is that the light-transmissive substrate is detachably disposed on the blue light-emitting device, so that the color conversion layers of different thicknesses can be easily replaced, and thus can be immediately under a single light source. Control the intensity ratio of blue light to red light. In addition, the adjustable dual-band light source structure of the present invention can directly convert part of the blue light to the red light by the color conversion layer, so that the red light element is not required to be driven. And greatly reduce the power consumption of the light source. Moreover, the adjustable dual-band light source structure of the present invention is disposed on the path of the blue light by the color conversion layer, thereby providing excellent chromaticity uniformity.

The blue light element may be a light emitting diode, an organic light emitting diode or other blue light source emitting a wavelength between 430 nm and 460 nm.

Wherein, the color conversion layer comprises a package component and a color conversion component, and the color The conversion layer absorbs blue light having a wavelength between 430 nm and 460 nm and generates red light having a wavelength between 640 nm and 660 nm, and the color conversion element may be an inorganic fluorescent powder or an organic fluorescent material. , organic phosphorescent materials or other suitable materials.

Wherein, the color conversion layer can be coated on one surface of the light transmissive substrate by using a printing coating technique, a spin coating technique or an inkjet coating technique.

The transparent substrate may be a hard transparent substrate or a flexible transparent substrate.

The light transmissive substrate may be an optical glass.

In addition, the adjustable dual-band light source structure of the present invention may further comprise a light source substrate, and the blue light component and the encapsulation layer are disposed on the light source substrate, so that the encapsulation layer and the light source substrate together seal the blue light component.

The light source substrate may be a glass substrate or a flexible substrate.

The flexible substrate may be a plastic substrate or a metal foil.

In addition, the adjustable dual-band light source structure of the present invention may further comprise a light guiding structure, which may be disposed on the blue component or the color conversion layer, thereby improving the effective light extraction rate of the blue component or the color conversion layer.

In summary, the adjustable method for plant growth according to the present invention A dual-band source structure that can have one or more of the following advantages:

(1) The light-transmissive substrate is detachably disposed on the blue light-emitting device, so that the color conversion layers of different thicknesses can be easily replaced, and the intensity ratio of the blue light and the red light can be controlled instantaneously under a single light source.

(2) Directly converting part of the blue light to red light by the color conversion layer, so that it is not necessary to drive the red light element, thereby greatly reducing the power consumption required by the light source.

(3) Providing excellent chroma uniformity by setting the color conversion layer on the path of the blue light.

(4) By combining the blue light component instead of the blue light component and the red light component, the complexity of component fabrication is reduced, thereby improving the component fabrication yield, and the chromaticity shift is not generated under different light intensities. .

(5) By making a color conversion layer by coating, it can provide advantages of low production cost and rapid and rapid production, and can be applied to the production of large-area light sources and flexible light sources, and can greatly enhance plant growth. Uniformity of the light source.

100‧‧‧Adjustable dual-band light source structure

110‧‧‧Light source substrate

120‧‧‧Blue light emitting device

121‧‧‧Blue component

122‧‧‧Encapsulation layer

130‧‧‧Transparent substrate

140, 140a, 140b, 140c‧‧‧ color conversion layer

141‧‧‧Package components

142‧‧‧Color conversion components

150‧‧‧Light guide

210, 210a, 210b, 210c‧‧‧ thickness

310‧‧‧Blue

320a, 320b, 320c‧‧‧ red light

Fig. 1 is a schematic view showing the structure of an adjustable dual-band light source applicable to plant growth of the present invention.

Fig. 2 is a schematic view showing the first embodiment of the adjustable dual-band light source structure applicable to plant growth of the present invention.

Fig. 3 is a schematic view showing the second embodiment of the adjustable dual-band light source structure applicable to plant growth of the present invention.

Figure 4 is an adjustable double of the invention applicable to plant growth A schematic diagram of a third embodiment of a band source structure.

Fig. 5 is a comparison diagram of red/blue light intensity of the first to third embodiments of the adjustable dual-band light source structure applicable to plant growth of the present invention.

Figure 6 is a comparison diagram of the red/blue light intensity of the adjustable dual-band light source structure applicable to plant growth under different blue light intensity conditions.

Please refer to FIG. 1 , which is a schematic diagram of the structure of an adjustable dual-band light source applicable to plant growth according to the present invention. As shown in FIG. 1, the adjustable dual-band light source structure 100 applicable to plant growth of the present invention comprises at least a blue light emitting device 120, a light transmissive substrate 130, and a color conversion layer 140. Moreover, the color conversion layer 140 is disposed on the transparent substrate 130, and the transparent substrate 130 is detachably disposed on the blue light emitting device 120, so that the adjustable dual-band light source structure 100 applicable to plant growth of the present invention can be replaced with different thicknesses. The color conversion layer 140 can quickly control the ratio of light intensity between blue light and red light under a single light source.

The blue light emitting device 120 has a blue light element 121 and an encapsulation layer 122 surrounding the blue light element 121. The blue light element 121 can emit blue light having a wavelength between about 430 nm and 460 nm. Wherein, the blue light element 121 can be any blue light source capable of generating blue light having a wavelength of about 430 nm to 460 nm. For example, the blue light element 121 is, for example, a light emitting diode (for example, a gallium nitride material) or an organic thin film light emitting diode element of an inorganic semiconductor that emits blue light having a wavelength of about 430 nm to 460 nm. . The encapsulation layer 122 surrounding the blue component 121 can seal the blue component 121 to prevent external moisture or dust from entering the blue component 121 to protect the blue component 121. The material of the encapsulation layer 122 can be, for example, silver paste or a solder paste or a gold tin solder having a high thermal conductivity.

In addition, the transparent substrate 130 is detachably disposed on the blue light emitting device 120, so that the user can easily and quickly change the ratio of the intensity of the red light to the blue light according to the color of the light source required by the plant at different growth stages. . The transparent substrate 130 can be, for example, a hard transparent substrate or a flexible transparent substrate. For example, the light transmissive substrate 130 can be made of optical glass or made of other materials that are transparent or transparent (eg, resin). Moreover, the transparent substrate 130 can be fabricated into a planar, curved or arbitrarily shaped transparent substrate 130 according to the needs of the user.

In addition, the color conversion layer 140 is disposed on the transparent substrate 130, and is detachably disposed on the blue light emitting device 120 by the transparent substrate 130, so as to be selectively located on the light path of the blue light emitted by the blue light element 121. When the transparent substrate 130 is disposed on the blue light emitting device 120, the color conversion layer 140 and the blue light element 121 are respectively located on opposite sides of the package layer 122. Moreover, since the color conversion layer 140 is located on the light path of the blue light emitted by the blue light element 121 when the transparent substrate 130 is disposed on the blue light emitting device 120, the blue light to wavelength of the converted portion of the color conversion layer 140 is approximately Red light between 640 nm and 660 nm. The ratio of the intensity of the red light converted by the color conversion layer 140 to the blue light before the conversion is positively correlated with the thickness 210 of the color conversion layer 140. That is, the thicker the thickness 210 of the color conversion layer 140, the higher the intensity ratio of the red light to the blue light.

The color conversion layer 140 may include, for example, a package component 141 and a color conversion component 142, and the color conversion component 142 absorbs blue light having a wavelength between about 430 nm and 460 nm, and generates a wavelength of about 640 nm. Red light between 660 nm. Wherein, the color conversion element 142 can be, for example, an inorganic phosphor powder, an organic fluorescent material, an organic phosphorescent material or other blue light having an absorption wavelength between about 430 nm and 460 nm and a wavelength of about 640 nm to 660 nm. Red light material. The package component 141 can fix the color conversion component 142 on the transparent substrate 130 and can be avoided. External moisture or dust is prevented from entering the color conversion element 142.

For example, color conversion element 142 can be, for example, a red phosphor, and package element 141 can be, for example, a sol. Therefore, the color conversion layer 140 of the adjustable dual-band light source structure 100 of the present invention can be prepared by, for example, mixing the red phosphor powder and the sol thoroughly, and then using the printing and coating technology of the mixed red phosphor powder and the sol. A coating technique such as a spin coating technique or an inkjet coating technique is applied to the surface of the light-transmitting substrate 130. That is, the color conversion layer 140 of the adjustable dual-band light source structure 100 of the present invention can be applied to the surface of the light-transmitting substrate 130 by a coating technique such as a printing coating technique, a spin coating technique, or an inkjet coating technique. When the mixed red phosphor powder and the sol are coated on the surface of the light-transmitting substrate 130, the light-transmitting substrate 130 coated with the mixed red phosphor powder and the sol is baked at a high temperature. Then, after the high temperature baking is performed, the mixed red phosphor powder and the sol transparent substrate 130 are placed at room temperature for cooling, and then the color conversion layer 140 is applied to the transparent substrate 130. on.

In addition, the adjustable dual-band light source structure 100 applicable to plant growth of the present invention can be applied to the thickness 210 of the transparent substrate 130 by the color conversion layer 140, thereby producing color conversion layers 140 of different thicknesses. Moreover, the user can adjust the light intensity ratio of the blue light and the red light according to different situations by replacing the transparent substrate 130 and the color conversion layer 140 located on the transparent substrate 130.

Please refer to FIG. 2 to FIG. 5 in succession. FIG. 2 is a schematic view showing the first embodiment of the adjustable dual-band light source structure applicable to plant growth of the present invention, and FIG. 3 is applicable to the present invention. A schematic diagram of a second embodiment of an adjustable dual-band light source structure for plant growth, and FIG. 4 is a third embodiment of the adjustable dual-band light source structure applicable to plant growth of the present invention, and FIG. 5 is a schematic diagram of The adjustable double-band light source structure of the invention applicable to plant growth A red/blue light intensity comparison chart of the first to third embodiments. The first embodiment, the second embodiment and the third embodiment of the adjustable dual-band light source structure of the present invention differ only in the thickness of the color conversion layer.

As shown in FIG. 1 to FIG. 5, the adjustable dual-band light source structure 100 of the present invention can convert wavelengths of about 430 nm according to the respective thicknesses 210a, 210b, and 210c of the color conversion layers 140a, 140b, and 140c. The blue light 310 between 460 nm and the red light 320a, 320b, 320c having a wavelength of different light intensity of between about 640 nm and 660 nm. For example, when the luminance of the blue light element 121 is 1000 candelas per square meter (cd/m ² ), and the thickness 210a of the color conversion layer 140a in the first embodiment of the adjustable dual-band light source structure 100 of the present invention When it is 50 micrometers, the light intensity ratio between the red light 320a and the blue light 310 converted by the color conversion layer 140a is about 1:4; when the second embodiment of the adjustable dual-band light source structure 100 of the present invention When the thickness 210b of the medium color conversion layer 140b is 150 μm, the light intensity ratio between the red light 320b and the blue light 310 converted by the color conversion layer 140b is about 1:1; and when the adjustable dual-band light source structure of the present invention is When the thickness 210c of the color conversion layer 140c in the third embodiment of 100 is 300 μm, the light intensity ratio between the red light 320c and the blue light 310 converted by the color conversion layer 140c is about 4:1.

Therefore, the adjustable dual-band light source structure 100 of the present invention only needs to replace the color conversion layer 140 of different thicknesses, so that the light intensity ratio of the blue light and the red light can be easily adjusted under a single light source (the blue light element 121), thereby easily cooperating. The light source that plants need at different stages of growth.

In addition, the applicant further proposes experimental data to prove that the effect of the adjustable dual-band light source structure 100 of the present invention is not only simple to adjust the light intensity ratio of blue light and red light under a single light source, but also different light intensity. In the case of chromaticity shift, there is no case. Please refer to Figure 6 below. Figure 6 is the invention. The red/blue light intensity comparison chart of the adjustable dual-band light source structure for plant growth under different blue light intensity conditions. As shown in FIGS. 1 and 6, when the thickness 210 of the color conversion layer 140 is 150 μm, the luminance of the blue light element 121 is 1000 candelas per square meter, 3,000 candelas per square meter, or 5,000 candelas per square centimeter. The blue light and the red light generated by the adjustable dual-band light source structure 100 of the present invention have only a change in the light intensity value, but the light intensity ratio between the blue light and the red light and the respective chromaticity are not Variety. Therefore, the adjustable dual-band light source structure 100 of the present invention does not cause chromaticity shift under different light intensities. That is, the light source design of the adjustable dual-band light source structure 100 of the present invention has excellent operational stability and is very suitable for a stable light source required for plant growth.

In addition, the adjustable dual-band light source structure 100 of the present invention may further include a light source substrate 110, and the blue light element 121 and the package layer 122 may be disposed on the light source substrate 110, so that the package layer 122 and the light source substrate 110 together seal the blue light element 121, Further, external moisture or dust is prevented from entering the blue light element 121 to reduce the damage rate of the blue light element 121. The light source substrate 110 can be, for example, a glass substrate or a flexible substrate, and the flexible substrate can be, for example, a plastic substrate, a metal foil, or other suitable flexible substrate. Therefore, the adjustable dual-band light source structure 100 of the present invention can be combined with the shape of the light source substrate 110 and the transparent substrate 130, thereby changing the shape of the adjustable dual-band light source structure 100 of the present invention, and thus the present invention can be provided. The modulated dual-band light source structure 100 is on any surface or object.

In addition, the adjustable dual-band light source structure 100 of the present invention may further include a light guiding structure 150, and the light guiding structure 150 may be disposed on the blue light element 121 or the color conversion layer 140, thereby enhancing the blue light emitted by the blue light element 121 or The effective light extraction rate of the red light converted by the color conversion layer 140. For example, the light guiding structure 150 can be disposed on the color conversion layer 140, and the width of the light guiding structure 150 can be greater than the color conversion layer. The width of 140 is such that the blue light that has passed through the color conversion layer 140 and the red light converted from the color conversion layer 140 are uniformly emitted through the light guiding structure 150, thereby improving the effective light extraction rate of the adjustable dual-band light source structure 100 of the present invention. The light guiding structure 150 can be, for example, a material that can reflect light on the surrounding surface of the optical fiber combination or light guiding structure 150.

In summary, one of the features of the adjustable dual-band light source structure 100 of the present invention is that the transparent substrate 130 is detachably disposed on the blue light emitting device 120, so that the color conversion layer 140 of different thicknesses 210 can be easily replaced. In turn, the light intensity ratio of blue light and red light can be controlled in real time under a single light source. In addition, the adjustable dual-band light source structure 100 of the present invention can directly convert part of the blue light to the red light by the color conversion layer 140, thereby eliminating the need for the red light-emitting element, thereby greatly reducing the power consumption required by the light source. Moreover, the adjustable dual-band light source structure 100 of the present invention is disposed on the path of the blue light by the color conversion layer 140 to provide excellent chromaticity uniformity.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

100‧‧‧Adjustable dual-band light source structure

110‧‧‧Light source substrate

120‧‧‧Blue light emitting device

121‧‧‧Blue component

122‧‧‧Encapsulation layer

130‧‧‧Transparent substrate

140‧‧‧Color conversion layer

141‧‧‧Package components

142‧‧‧Color conversion components

150‧‧‧Light guide

210‧‧‧ thickness

Claims (10)

An adjustable dual-band light source structure applicable to plant growth, comprising at least: a blue light emitting device having a blue component and an encapsulation layer surrounding the blue component, the blue component emitting a wavelength between 430 nm and 460 a blue light between the nano; a transparent substrate, detachably disposed on the blue light emitting device; and a color conversion layer on the transparent substrate, wherein the color conversion layer and the blue component are respectively located in the package layer On the opposite side, the color conversion layer converts the blue light to a red light having a wavelength between 640 nm and 660 nm, wherein the red light and the blue light intensity ratio are positively correlated with the color conversion layer. One thickness. The adjustable dual-band light source structure applicable to plant growth as described in claim 1, wherein the blue light component emits the light emitting diode having a wavelength between 430 nm and 460 nm or Organic light-emitting diodes. The adjustable dual-band light source structure applicable to plant growth according to claim 1, wherein the color conversion layer comprises a package component and a color conversion component, and the color conversion layer absorbs the wavelength between 430 nm and Blue light between 460 nm and producing red light having a wavelength between 640 nm and 660 nm, the color conversion element being an inorganic phosphor, an organic fluorescent material or an organic phosphor material. The adjustable dual-band light source structure applicable to plant growth as described in claim 1, wherein the color conversion layer is coated on the surface by using a printing coating technique, a spin coating technique or an inkjet coating technique. On one of the surfaces of the light substrate. The adjustable dual-band light source structure applicable to plant growth according to claim 1, wherein the transparent substrate is a hard transparent substrate or a flexible transparent substrate. The adjustable dual-band light source structure applicable to plant growth according to claim 1, wherein the transparent substrate is an optical glass. The adjustable dual-band light source structure applicable to plant growth according to claim 1, further comprising a light source substrate, wherein the blue component and the encapsulation layer are disposed on the light source substrate, such that the encapsulation layer and the light source The substrate collectively seals the blue light element. The adjustable dual-band light source structure applicable to plant growth according to claim 7, wherein the light source substrate is a glass substrate or a flexible substrate. The adjustable dual-band light source structure applicable to plant growth as described in claim 8 is wherein the flexible substrate is a plastic substrate or a metal foil. The adjustable dual-band light source structure applicable to plant growth according to claim 1, further comprising a light guiding structure disposed on the blue component or the color conversion layer to enhance the blue component or the color conversion The effective light extraction rate of the layer.