CN105449079A - Color temperature adjustable white light LED lighting source - Google Patents
Color temperature adjustable white light LED lighting source Download PDFInfo
- Publication number
- CN105449079A CN105449079A CN201510976423.1A CN201510976423A CN105449079A CN 105449079 A CN105449079 A CN 105449079A CN 201510976423 A CN201510976423 A CN 201510976423A CN 105449079 A CN105449079 A CN 105449079A
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- color temperature
- light led
- susceptible coating
- heat susceptible
- light source
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/483—Containers
- H01L33/486—Containers adapted for surface mounting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/52—Encapsulations
- H01L33/56—Materials, e.g. epoxy or silicone resin
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/58—Optical field-shaping elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2933/00—Details relating to devices covered by the group H01L33/00 but not provided for in its subgroups
- H01L2933/0091—Scattering means in or on the semiconductor body or semiconductor body package
Abstract
The invention relates to a color temperature adjustable white light LED lighting source. The color temperature adjustable white light LED lighting source comprises a blue light LED chip fixed on a base, yellow fluorescent powder, a packaging glue layer and thermosensitive coating; the yellow fluorescent powder is coated on the blue light LED chip; the packaging glue layer is located at the upper side of the blue light LED chip; the thermosensitive coating is coated on the packaging glue layer; when the environment temperature is higher than the conversion temperature of the thermosensitive coating, the thermosensitive coating is in transparent state; when the environment temperature is lower than the conversion temperature of the thermosensitive coating, the thermosensitive coating is in scattering state. The color temperature adjustable white light LED lighting source of the invention can realize adjustment of low color temperature white light and high color temperature white light and solves the problem that the existing LED is not liable to realize changeability and adjustment of the light color.
Description
Technical field
The present invention relates to White-light LED illumination field, particularly a kind of adjustable color temperature White-light LED illumination light source.
Background technology
In recent years, LED lamp is used to general lighting field more and more because of its energy-saving and environmental protection, conversion efficiency advantages of higher, but traditional LED lamp generally is fixing colour temperature when dispatching from the factory, to meet the lighting demand of different-colour at different occasion, different time, often need the LED lamp suitably changing another colour temperature, this makes cost improve, installs inconvenience.Therefore, be necessary that developing one caters to the market demand, with low cost and more intelligent adjustable color temperature LED.
A kind of adjustable color LED of Chinese invention patent and color temperature adjusting method (CN101482232A) thereof propose a kind of method regulating LED colour temperature, realize by designing complicated control circuit, CPU is mainly utilized to control the LED lamp luminosity numerical value of LED group different-colour, thus the overall colour temperature of the LED of mixing is changed, though this technology achieves change colour temperature, but being realize by increasing external control circuit control LED group, not relating to the change of LED itself.
Summary of the invention
For above-mentioned technical problem, the invention provides a kind of easy to use, adjustable color temperature white light LEDs that cost is lower.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of adjustable color temperature White-light LED illumination light source, comprise the blue-light LED chip be fixed on base, yellow fluorescent powder, encapsulation glue-line and heat susceptible coating, described yellow fluorescent powder is coated on described blue-light LED chip, described encapsulation glue-line is positioned on the upside of described blue-light LED chip, described heat susceptible coating is coated on described encapsulation glue-line, when the transition temperature of ambient temperature higher than described heat susceptible coating, the transparent state of described heat susceptible coating, when the transition temperature of ambient temperature lower than described heat susceptible coating, described heat susceptible coating is scattering state.
Further, described ambient temperature is by the Current Control flowing through described adjustable color temperature White-light LED illumination light source.
Further, described heat susceptible coating is made up of Thermotropic Cholesteric Liquid Crystals material.
Further, the transition temperature of described heat susceptible coating is 45 DEG C-55 DEG C.
Further, the wavelength of light scope that described blue-light LED chip sends is 440nm-470nm.
Further, described yellow fluorescent powder at least comprises a kind of fluorescent material.
Further, the reference color temperature of the low colour temperature of described adjustable color temperature White-light LED illumination light source is 2700K-3500K.
Further, the reference color temperature of the high color temperature of described adjustable color temperature White-light LED illumination light source is 3500K-6500K.
Further, the ambient temperature of the transparent state of described heat susceptible coating is made to be 55 DEG C-150 DEG C.
Further, described heat susceptible coating is made to be that the ambient temperature of scattering state is-50 DEG C-45 DEG C.
The present invention is owing to adopting above technical scheme, its technique effect reached is: 1, because the present invention adopts heat susceptible coating, described heat susceptible coating is coated on described encapsulation glue-line, when the transparent state of described heat susceptible coating, the transmissivity of the gold-tinted that yellow fluorescent powder sends can be reduced, increase its reflectivity, increase the transmissivity of the blue light that blue-light LED chip sends simultaneously, make LED illumination light source send high color temperature white light; When described heat susceptible coating is scattering state, the transmissivity of the blue light that blue-light LED chip sends can be reduced, increase its reflectivity, increase the transmissivity of the gold-tinted that yellow fluorescent powder sends simultaneously, make LED illumination light source send low color temperature white light, solve the light color variable of existing LED existence and the problem of modulability difference.2, because heat susceptible coating of the present invention is made up of Thermotropic Cholesteric Liquid Crystals material, by changing ambient temperature, comparatively fast can realize the conversion between described heat susceptible coating two states, realizing the quick adjustment of described LED illumination light source low color temperature white light and high color temperature white light.
Heat susceptible coating Thermotropic Cholesteric Liquid Crystals material used has the arrangement architecture of helical molecular orientation, and this special structure makes described Thermotropic Cholesteric Liquid Crystals material have the characteristic of selective scattering.Raise when ambient temperature or reduce, the pitch of described Thermotropic Cholesteric Liquid Crystals material can change, and the size of pitch determines the characteristic of described Thermotropic Cholesteric Liquid Crystals material Transmission light and selective scattering.Further, when pitch change, the peak wavelength of described Thermotropic Cholesteric Liquid Crystals material reflects visible light also changes thereupon, so described liquid crystal material can make gold-tinted and blue light generation transmission or reflection at different temperatures respectively.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is the structural representation of adjustable color temperature White-light LED illumination light source of the present invention;
Fig. 2 is the low colour temperature fundamental diagram of adjustable color temperature White-light LED illumination light source of the present invention.
Fig. 3 is adjustable color temperature White-light LED illumination light source high color temperature fundamental diagram of the present invention.
In figure: 1-blue-light LED chip, 2-yellow fluorescent powder, 3-encapsulated layer, 4-heat susceptible coating.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.It should be noted that, in figure, eliminate the mark to known features and explanation, the support of such as LED, heat sink, the structure such as pin and spun gold.
As shown in Figure 1 to Figure 3, the present invention includes the blue-light LED chip 1 be fixed on base, yellow fluorescent powder 2, encapsulated layer 3 and heat susceptible coating 4, described yellow fluorescent powder 2 is coated on described blue-light LED chip 1, described encapsulated layer 3 is positioned on the upside of described blue-light LED chip 1, described heat susceptible coating 4 is coated on described encapsulated layer 3, when the transition temperature of ambient temperature higher than described heat susceptible coating 4, the transparent state of described heat susceptible coating 4, when the transition temperature of ambient temperature lower than described heat susceptible coating 4, described heat susceptible coating 4 is in scattering state.
The present invention adopts heat susceptible coating 4, described heat susceptible coating 4 is coated on described encapsulated layer 3, when described heat susceptible coating 4 is in scattering state, the blue light that major part blue-light LED chip 1 sends is reflected back toward yellow fluorescent powder 2, excited by yellow fluorescent powder 2 and produce more gold-tinted, the heat susceptible coating of this state can reduce the transmissivity of the blue light that blue-light LED chip 1 sends, and increases its reflectivity, increase the transmissivity of the gold-tinted that yellow fluorescent powder 2 sends simultaneously, make LED illumination light source send low color temperature white light; When described heat susceptible coating 4 transparent state, the blue light that sends of major part blue-light LED chip 1 can pass through, and reduces blue light reflectance, thus weakens and excite yellow fluorescent powder 2 to send gold-tinted, make LED illumination light source send high color temperature white light, improve LED light color variability and modulability.
In the above-described embodiments, described ambient temperature is by the Current Control flowing through described adjustable color temperature White-light LED illumination light source.
Particularly, described heat susceptible coating 4 is made up of Thermotropic Cholesteric Liquid Crystals material.Described liquid crystal material when temperature is lower, liquid crystal material anisotropy, liquid crystal material can be in scattering state; Temperature raises, and liquid crystal material melts, and becomes isotropism, and scattering disappears and becomes pellucidity.Because described heat susceptible coating 4 is made up of thermotropic liquid crystal material, by changing ambient temperature, comparatively fast can realize the conversion between described heat susceptible coating 4 two states, realizing the quick adjustment of described LED illumination light source low color temperature white light and high color temperature white light.
Heat susceptible coating Thermotropic Cholesteric Liquid Crystals material used has the arrangement architecture of helical molecular orientation, and this special structure makes described Thermotropic Cholesteric Liquid Crystals material have the characteristic of selective scattering.Raise when ambient temperature or reduce, the pitch of described Thermotropic Cholesteric Liquid Crystals material can change, and the size of pitch determines the characteristic of described Thermotropic Cholesteric Liquid Crystals material Transmission light and selective scattering.Further, when pitch change, the peak wavelength of described Thermotropic Cholesteric Liquid Crystals material reflects visible light also changes thereupon, so described liquid crystal material can make gold-tinted and blue light generation transmission or reflection at different temperatures respectively.
In the above-described embodiments, the transition temperature of described heat susceptible coating 4 is 45 DEG C-55 DEG C.
In the above-described embodiments, the wavelength of light scope that described blue-light LED chip sends is 440nm-470nm.
Particularly, described yellow fluorescent powder 2 at least comprises a kind of fluorescent material.
Further, the reference color temperature of the low colour temperature of described adjustable color temperature White-light LED illumination light source is 2700K-3500K.
The reference color temperature of the high color temperature of described adjustable color temperature White-light LED illumination light source is 3500K-6500K further.
Further, the ambient temperature making the transparent state of described heat susceptible coating 4 is 55 DEG C-150 DEG C.
Further, the ambient temperature of described heat susceptible coating 4 in scattering state is made to be-50 DEG C-45 DEG C.
State in the adjustable color temperature White-light LED illumination light source of embodiment on the invention, blue-light LED chip 1 adopts blue gallium nitride (GaN) chip, yellow fluorescent powder 2 adopts yttrium-aluminium-garnet (YAG) fluorescent material, encapsulated layer 3 between heat susceptible coating 4 and yellow fluorescent powder 2 is polysiloxanes, heat susceptible coating 4 adopts liquid crystal material of cholesteric phase, is coated in encapsulated layer 3 top layer.Because polysiloxanes thermal stability is very good, and also very superior to the conductive performance of variations in temperature, so with being a kind of preferred encapsulating material in the present invention.Switched by the state of heat susceptible coating 4, the adjustment of LED colour temperature can be realized.
The adjustable color temperature White-light LED illumination light source state switching principle of the above embodiment of the present invention is the heat susceptible coating Thermotropic Cholesteric Liquid Crystals properties of materials based on selecting, temperature can affect the pitch of Thermotropic Cholesteric Liquid Crystals material, and the size of pitch plays a decisive role to Transmission light and selectivity scattering.Along with the change of temperature, Thermotropic Cholesteric Liquid Crystals can reflect the visible ray of different colours, by the proportioning of adjustable liquid crystal display material and mixture, can realize the selection of temperature control and working range, realize effect of the present invention better.
Operation principle the following detailed description of the above embodiment of the present invention:
When less by the electric current of LED illumination light source, for 20mA, its luminance as shown in Figure 2, gallium nitride (GaN) chip can excite yttrium-aluminium-garnet (YAG) fluorescent material to produce the light of warm white, arrow in the middle of Fig. 2 represents the blue light that gallium nitride (GaN) chip sends, the arrow of both sides represents the gold-tinted that yttrium-aluminium-garnet (YAG) fluorescent material sends, when owing to being operated in small area analysis, the temperature of LED illumination light source is lower, about 35 DEG C, the shortage of heat being arrived heat susceptible coating 4 by heat transfer is transformed into pellucidity to make thermotropic liquid crystal material from scattering state, in the scattering state, can be reflected in a large number when blue light runs into liquid crystal material, yttrium-aluminium-garnet (YAG) fluorescent material is excited to produce more gold-tinted, and gold-tinted can outwards be launched through liquid crystal material smoothly, so LED illumination light source finally sends the low color temperature white light less for blue color spectrum of light.
When larger by the electric current of LED illumination light source, for 80mA, its luminance as shown in Figure 3, gallium nitride (GaN) chip can excite yttrium-aluminium-garnet (YAG) fluorescent material to produce the light of warm white, arrow in the middle of Fig. 3 represents the blue light that gallium nitride (GaN) chip sends, the arrow of both sides represents the gold-tinted that yttrium-aluminium-garnet (YAG) fluorescent material sends, when owing to being operated in big current, the temperature of LED illumination light source is higher, about 60 DEG C, at this moment LED illumination light source can make thermotropic liquid crystal material be transformed into pellucidity from scattering state after producing heat conduction to heat susceptible coating 4, in the clear state, the blue light that gallium nitride (GaN) chip sends can outwards be launched through liquid crystal material smoothly, and gold-tinted is then suppressed, so LED illumination light source finally sends the high color temperature white light more for blue color spectrum of light.
Above-mentioned execution mode is intended to illustrate that the present invention can be professional and technical personnel in the field and realizes or use; modifying to above-mentioned execution mode will be apparent for those skilled in the art; therefore the present invention includes but be not limited to above-mentioned execution mode; any these claims or specification of meeting describes; meet and principle disclosed herein and novelty, the method for inventive features, technique, product, all fall within protection scope of the present invention.
Claims (6)
1. an adjustable color temperature White-light LED illumination light source, it is characterized in that, comprise: be fixed on the blue-light LED chip on base, yellow fluorescent powder, encapsulation glue-line and heat susceptible coating, described yellow fluorescent powder is coated on described blue-light LED chip, described encapsulation glue-line is positioned on the upside of described blue-light LED chip, described heat susceptible coating is coated on described encapsulation glue-line, when the transition temperature of ambient temperature higher than described heat susceptible coating, the transparent state of described heat susceptible coating, when the transition temperature of ambient temperature lower than described heat susceptible coating, described heat susceptible coating is scattering state.
2. adjustable color temperature White-light LED illumination light source as claimed in claim 1, it is characterized in that, described ambient temperature is by the Current Control flowing through described adjustable color temperature White-light LED illumination light source.
3. adjustable color temperature White-light LED illumination light source as claimed in claim 1, it is characterized in that, described heat susceptible coating is made up of Thermotropic Cholesteric Liquid Crystals material.
4. adjustable color temperature White-light LED illumination light source as claimed in claim 1, it is characterized in that, the transition temperature of described heat susceptible coating is 45 DEG C-55 DEG C.
5. the adjustable color temperature White-light LED illumination light source according to any one of Claims 1-4, is characterized in that, makes the ambient temperature of the transparent state of described heat susceptible coating be 55 DEG C-150 DEG C.
6. the adjustable color temperature White-light LED illumination light source according to any one of Claims 1-4, is characterized in that, makes described heat susceptible coating be that the ambient temperature of scattering state is-50 DEG C-45 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510976423.1A CN105449079B (en) | 2015-12-24 | 2015-12-24 | A kind of adjustable color temperature White-light LED illumination light source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510976423.1A CN105449079B (en) | 2015-12-24 | 2015-12-24 | A kind of adjustable color temperature White-light LED illumination light source |
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| CN105449079A true CN105449079A (en) | 2016-03-30 |
| CN105449079B CN105449079B (en) | 2018-10-23 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108071947A (en) * | 2017-10-27 | 2018-05-25 | 广东工业大学 | A kind of LED lamp of no circuit regulation and control |
| CN108828857A (en) * | 2018-08-31 | 2018-11-16 | 合肥京东方光电科技有限公司 | A kind of white light source device and its color temperature adjusting method |
| CN109244223A (en) * | 2018-11-16 | 2019-01-18 | 深圳市洲明科技股份有限公司 | display screen |
| CN110296331A (en) * | 2019-07-08 | 2019-10-01 | 海盐金隆照明科技有限公司 | A kind of Landscape Lighting color-adjustable warm type LED light |
| CN114395153A (en) * | 2021-12-28 | 2022-04-26 | 宁波信泰机械有限公司 | White light transmitting composite film layer and preparation method and application thereof |
| CN114877265A (en) * | 2022-05-06 | 2022-08-09 | 佛山电器照明股份有限公司 | Laser lighting device and manufacturing method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108071947A (en) * | 2017-10-27 | 2018-05-25 | 广东工业大学 | A kind of LED lamp of no circuit regulation and control |
| CN108828857A (en) * | 2018-08-31 | 2018-11-16 | 合肥京东方光电科技有限公司 | A kind of white light source device and its color temperature adjusting method |
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| CN110296331A (en) * | 2019-07-08 | 2019-10-01 | 海盐金隆照明科技有限公司 | A kind of Landscape Lighting color-adjustable warm type LED light |
| CN114395153A (en) * | 2021-12-28 | 2022-04-26 | 宁波信泰机械有限公司 | White light transmitting composite film layer and preparation method and application thereof |
| CN114877265A (en) * | 2022-05-06 | 2022-08-09 | 佛山电器照明股份有限公司 | Laser lighting device and manufacturing method thereof |
| CN114877265B (en) * | 2022-05-06 | 2024-01-23 | 佛山电器照明股份有限公司 | Laser lighting device and manufacturing method thereof |
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| Publication number | Publication date |
|---|---|
| CN105449079B (en) | 2018-10-23 |
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