CN105465656A - Light emitting device - Google Patents
Light emitting device Download PDFInfo
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- CN105465656A CN105465656A CN201410433093.7A CN201410433093A CN105465656A CN 105465656 A CN105465656 A CN 105465656A CN 201410433093 A CN201410433093 A CN 201410433093A CN 105465656 A CN105465656 A CN 105465656A
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Abstract
The embodiment of the invention discloses a light emitting device. The light emitting device comprises a light emitting element array and a light guide device, wherein the light emitting element array comprises at least one light emitting element and is used for generating exciting light; the light guide device comprises a light incoming face and a light outgoing face; the light emitting element array is covered with the light incoming face, and the difference between the area of the light incoming face and the area of the light emitting element array does not exceed one quarter of the area of the light incoming face; the light outgoing face is covered with a wavelength conversion layer which is used for absorbing the exciting light and generating excited light. According to the light emitting device provided by the embodiment of the invention, the wavelength conversion layer can be prevented from being affected by heat of the light emitting elements.
Description
Technical field
The present invention relates to display and lighting technical field, particularly relate to a kind of light-emitting device.
Background technology
White light LEDs (LightEmittingDiode in existing light-emitting device, light emitting diode) for light-emitting area being coated with the blue-ray LED of one deck yellow fluorescence bisque, this yellow fluorescence bisque absorbs the some blue light of blue-ray LED outgoing to produce yellow Stimulated Light, this yellow Stimulated Light and the outgoing of unabsorbed blue light synthesize white light.
But the light conversion efficiency of fluorescent material reduces gradually along with the rising of temperature.Because yellow fluorescence bisque is laid in the light-emitting area of LED, the heat that LED produces when luminescence can be absorbed by this yellow fluorescence bisque, causes the light conversion efficiency of yellow fluorescence bisque low.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of light-emitting device can avoiding the heat effects of wavelength conversion layer emitting element.
Embodiments provide a kind of light-emitting device, comprising:
Comprise the light-emitting device array of at least one light-emitting component, for generation of exciting light;
Described incidence surface covers described light-emitting device array, and the difference of the area of the area of described incidence surface and described light-emitting device array is no more than 1/4th of the area of described incidence surface;
Described exiting surface is coated with wavelength conversion layer, for absorbing described exciting light and producing Stimulated Light.
Preferably, described guiding device comprises the first compound parabolic collector (CPC) and the 2nd CPC, and a described CPC comprises the first relative end face and the second end face respectively with the 2nd CPC, and wherein said first end face is less than described second end face;
First end face of a described CPC is the incidence surface of described guiding device, first end face of described 2nd CPC is the exiting surface of described guiding device, second end face of a described CPC and second end face of described 2nd CPC connect or adjacent, make incide in second end face of described 2nd CPC from the light beam of the second end face outgoing of a described CPC.
Preferably, the incident angle of a described CPC differs with the lighting angle of described light-emitting component and is no more than 10 degree, the incident angle of a wherein said CPC be after first surface feeding sputtering of a described CPC at most through primary event namely from the maximum incident angle degree of the incident ray of the second end face outgoing of a described CPC.
Preferably, to differ with the incident angle of described 2nd CPC from the maximum shooting angle of the light beam of the second end face outgoing of a described CPC and be no more than 10 degree, the incident angle of wherein said 2nd CPC be after second surface feeding sputtering of described 2nd CPC at most through primary event namely from the maximum incident angle degree of the incident ray of the first end face outgoing of described 2nd CPC.
Preferably, 80 degree are greater than from the maximum shooting angle of the light of the first end face outgoing of described 2nd CPC.
Preferably, second end face of described 2nd CPC is greater than or equal to second end face of a described CPC.
Preferably, a described CPC and the 2nd CPC is solid, and a described CPC and the 2nd CPC is one-body molded.
Preferably, described light-emitting device array is immersed in the entrance port of a described CPC;
And/or,
Described wavelength conversion layer is immersed in the entrance port of described 2nd CPC.
Preferably, between a described CPC and described 2nd CPC, be provided with optical filter, reflect described Stimulated Light for exciting light described in transmission;
And/or,
Also be provided with optical filter between described wavelength conversion layer and described 2nd CPC, reflect described Stimulated Light for exciting light described in transmission.
Preferably, the side of described wavelength conversion layer described 2nd CPC dorsad is also provided with ringwise reflecting surface, described reflecting surface is a part for sphere, and described wavelength conversion layer is positioned at the centre of sphere place of described sphere, and the central shaft of described reflecting surface crosses described wavelength conversion layer.
As can be seen from the above technical solutions, the embodiment of the present invention has the following advantages:
In the embodiment of the present invention, owing to being separated with guiding device between wavelength conversion layer and light-emitting device array, avoid the light conversion efficiency of heat to wavelength conversion layer that light-emitting device array produces to impact, and the difference of the area of the incidence surface of guiding device and the area of light-emitting device array is no more than 1/4th of the area of incidence surface, the light beam avoiding light-emitting device array optical extend increase after guiding device is comparatively large, and then the situation that the brightness of Stimulated Light avoiding wavelength conversion layer outgoing reduces.
Accompanying drawing explanation
Fig. 1 is the structural representation of an embodiment of light-emitting device of the present invention;
Fig. 2 is the structural representation of another embodiment of light-emitting device of the present invention;
Fig. 3 is the structural representation of another embodiment of light-emitting device of the present invention.
Detailed description of the invention
Refer to Fig. 1, Fig. 1 is the structural representation of an embodiment of light-emitting device of the present invention.Light-emitting device comprises light-emitting device array 11 and guiding device 12.
In the present embodiment, light-emitting device array 11 comprises at least one light-emitting component, for generation of exciting light.Light-emitting component can be LED or other Sony ericsson mobile comm abs, and this is not restricted.The arrangement shape of light-emitting device array 11 can be rectangle, circle, regular hexagon or other rules or irregular arrangement shape, and this is not restricted.Concrete, in the present embodiment, light-emitting device array 11 is a LED.
Guiding device 12 comprises incidence surface 121 and exiting surface 122, and this incidence surface 121 covering luminous element array 11, with exiting surface 122 also outgoing that the emergent light of light-emitting device array 11 is led.Concrete, incidence surface 121 covering luminous element array 11 refers to the exiting surface that incidence surface 121 covers all light-emitting components in this light-emitting device array 11, is incident in guiding device 12 from incidence surface 121 to make whole light beams of light-emitting device array 11 outgoing.For avoiding the optical expander amount increase after guiding device 12 of the emergent light of light-emitting device array 11 comparatively large, the difference of the area of incidence surface 121 and the area of light-emitting device array 11 is no more than 1/4th of the area of this incidence surface 121.Wherein, the area that the exiting surface that the area of light-emitting device array 11 refers in this light-emitting device array all light-emitting components being positioned at outermost encloses.
Exiting surface 122 is coated with wavelength conversion layer 13, produces Stimulated Light for the exciting light that absorbs from light-emitting device array 11.In the present embodiment, light-emitting device array 11 is blue led, and wavelength conversion layer 13 specifically comprises yellow wavelengths transition material, for absorbing exciting light and being translated into yellow Stimulated Light outgoing.In practice, wavelength conversion layer can be the wavelength conversion layer that the material having wavelength conversion capability by fluorescent material, quantum dot or fluorescent dye etc. is formed.Material for transformation of wave length generally can use bonding agent bonding one-tenth entirety, and the most frequently used is silica gel bonding agent, its stable chemical nature, has higher mechanical strength.But silica gel bonding agent can tolerable temperature lower, generally at 300 degrees Celsius to 500 degrees Celsius.When light-emitting device array luminous power is larger, preferably, can with inorganic adhesive by bonding for material for transformation of wave length one-tenth entirety, such as waterglass or glass dust, to realize resistant to elevated temperatures wavelength conversion layer.Such as fluorescent material and glass dust (if temperature requirement is low, can use cryogenic glass powder) are melted under certain inert atmosphere protection and mix reshaping.
In the present embodiment, owing to being separated with guiding device between wavelength conversion layer and light-emitting device array, avoid the light conversion efficiency of heat to wavelength conversion layer that light-emitting device array produces to impact, and the difference of the area of the area light-emitting device array of the incidence surface of guiding device is no more than 1/4th of the area of incidence surface, the light beam avoiding light-emitting device array optical extend increase after guiding device is comparatively large, and then the situation that the brightness of Stimulated Light avoiding wavelength conversion layer outgoing reduces.Concrete, in the present embodiment, guiding device 12 comprises the first compound parabolic collector (CPC) 14 and the 2nd CPC15.One CPC14 comprises the first relative end face and the second end face respectively with the 2nd CPC15, and wherein the first end face is less than the second end face.First end face of the one CPC14 is the incidence surface 121 of guiding device 12, first end face of the 2nd CPC15 is the exiting surface 122 of guiding device 12, and second end face of second end face of a CPC and the 2nd CPC is in the same size and mutually splice, to make the light beam of the second end face outgoing from a CPC14 can all incide in second end face of the 2nd CPC15, and then from the first end face outgoing of the 2nd CPC15.So, first end face of first end face covering luminous element array the 11, two CPC15 of a CPC14 is coated with wavelength conversion layer 13.
Certainly, in practice, second end face of the 2nd CPC15 also can be a bit larger tham second end face of a CPC14, so also can ensure that the light beam of the second end face outgoing from a CPC14 can all incide in second end face of the 2nd CPC15.Even; second end face of the 2nd CPC is slightly smaller than second end face of a CPC; or second end face of second end face of a CPC and the 2nd CPC is not to connect but adjacent; causing segment beam to lose when being transferred to second end face of a CPC from second end face of a CPC, also belonging to protection category of the present invention.
In the present embodiment, the cross sectional shape of compound parabolic collector can be circular, square, hexagon or other shapes, and this is not restricted.If the cross sectional shape of compound parabolic collector is polygon, so the reflecting surface of compound parabolic collector is surrounded by N number of reflecting surface, and wherein N equals the quantity on this polygonal limit, and in the present embodiment, and each reflecting surface is formed by a parabola translation.
Preferably, in the present embodiment, in light-emitting device array 11, the shape of the light-emitting area composition of each light-emitting component is mated with the shape size of first end face of a CPC14, with the first end face making each light-emitting area of light-emitting device array can be full of a CPC14 largely, to avoid the emergent light of light-emitting device array 11 degree that optical extend increases after guiding device 12 larger.
Preferably, in the present embodiment, the incident angle of a CPC14 differs with the lighting angle of light-emitting device array 11 and is no more than 10 degree.Wherein, the design that the incident angle of a CPC14 refers to the reflecting surface of a CPC to make after first surface feeding sputtering of a CPC14 at most through primary event namely from the maximum incident angle degree of the incident ray of the second end face outgoing of a CPC14.The lighting angle of light-emitting device array 11 refers to the maximum shooting angle of the light beam of light-emitting device array outgoing.
Like this, in the light beam of light-emitting device array outgoing, the shooting angle of most of light beam is all less than the incident angle of a CPC, this most of light in the emergent light of therefore light-emitting device array only in a CPC at most through primary event and outgoing, light multiple reflections in a CPC is avoided to cause light loss higher, and then avoid the situation that the light efficiency of the emergent light of a CPC is low, be conducive to the light-emitting device obtaining high brightness.
Preferably, in the present embodiment, to differ with the incident angle of the 2nd CPC15 from the maximum shooting angle of the light beam of the second end face outgoing of a CPC14 and be no more than 10 degree, wherein the incident angle of the 2nd CPC15 be after second surface feeding sputtering of the 2nd CPC15 at most through primary event namely from the maximum incident angle degree of the incident ray of the first end face outgoing of the 2nd CPC15.
Like this, from the light beam of the second end face outgoing of a CPC14, the shooting angle of most of light beam is all less than the incident angle of the 2nd CPC15, therefore only maximum through primary event and outgoing in the 2nd CPC from this most of light the light beam of the second end face outgoing of a CPC14, light multiple reflections in the 2nd CPC is avoided to cause light loss higher, and then avoid the situation that the light efficiency of the emergent light of the 2nd CPC is low, be conducive to the light-emitting device obtaining high brightness.
Preferably, in the present embodiment, 80 degree are greater than from the maximum shooting angle of the light beam of the first end face outgoing of the 2nd CPC15, the facula area that formed at wavelength conversion layer 13 from the light beam of the first end face outgoing of the 2nd CPC15 can be made so less, and then make the emergent light spot area of wavelength conversion layer 13 outgoing Stimulated Light less, contribute to the brightness improving Stimulated Light.In this case, and when the lighting angle of the emergent light of light-emitting device array is greater than 80 degree, the area of the incidence surface of guiding device and the area of exiting surface differ 1/10th of the area preferably more than incidence surface.Because the lighting angle of the light beam of the emergent light of light-emitting device array and the exiting surface outgoing of guiding device is all greater than 80 degree, the area of the incidence surface of guiding device and the area of exiting surface differ 1/10th of the area preferably more than incidence surface, can ensure that the amount that the emergent light of light-emitting device array increases at optical extend after guiding device is less.
In practice, a CPC14 and the 2nd CPC15 can be solid or hollow respectively, and a CPC14 and the 2nd CPC15 can be all solid or be all hollow.Preferably, one CPC14 and the 2nd CPC15 is solid, and a CPC14 and the 2nd CPC15 is one-body molded, can avoid there is air-gap between second end face of second end face of a CPC14 and the 2nd CPC15 like this, and then the Fresnel loss avoiding light beam to occur on second end face of a CPC14 and second end face of the 2nd CPC15.Further, preferably, the light-emitting area of each light-emitting component of light-emitting device array 11 is immersed in first end face of a CPC14, and/or wavelength conversion layer 13 is immersed in first end face of the 2nd CPC15, to avoid the light-emitting area of each light-emitting component and/or to there is air-gap between wavelength conversion layer and CPC, thus avoid on the interface of light beam between this different medium Fresnel loss occurs.
Preferably, optical filter is provided with between a CPC and the 2nd CPC.As shown in Figure 2, between a CPC14 and the 2nd CPC15, be also provided with optical filter 21, reflect Stimulated Light for transmission exciting light; And/or, be also provided with optical filter 22 between wavelength conversion layer 13 and the 2nd CPC15, reflect Stimulated Light for transmission exciting light.Like this, wavelength conversion layer 13 all from the side outgoing of wavelength conversion layer 13 the 2nd CPC dorsad under the reflection of this optical filter 21 and/or optical filter 22, can improve the brightness of the Stimulated Light of light-emitting device outgoing from the partially-excited light of the side outgoing towards the 2nd CPC.
Wherein, optical filter 22 is provided with for preferably a kind of scheme between wavelength conversion layer 13 and the 2nd CPC15, in this scenario, wavelength conversion layer 13 directly can be reflected outgoing by optical filter 22 from the partially-excited light of the side outgoing towards the 2nd CPC15 without the need to the reflective surface through the 2nd CPC, and the partially-excited light in this partially-excited light can be avoided by the light loss caused during the reflective surface of the 2nd CPC.
Further, preferably, the emitting light path of wavelength conversion layer 13 side of the 2nd CPC dorsad is also provided with gathering-device.Specifically as shown in Figure 3, the side of wavelength conversion layer 13 the 2nd CPC15 dorsad is also provided with ringwise reflecting surface 31, wherein this reflecting surface 31 is a part for a sphere, and wavelength conversion layer 13 is positioned at the centre of sphere place of this sphere, and the central shaft of this reflecting surface 31 crosses wavelength conversion layer 13.Because the shooting angle of wavelength conversion layer 13 outgoing Stimulated Light is larger, by the setting of reflecting surface 31, make in the Stimulated Light of wavelength conversion layer 13 outgoing, the partially-excited light that shooting angle is less directly passes the through hole outgoing at reflecting surface 31 center, and the larger partially-excited light of shooting angle incides on reflecting surface 31, is then returned wavelength conversion layer 13 by this reflective surface.The outgoing again under the reflection of optical filter 21 or optical filter 22 of this partially-excited light.Like this, circulate therewith, finally all Stimulated Light can with the central through hole outgoing of less shooting angle from reflecting surface 31.
Further, gathering-device 32 can also be provided with, such as collimation lens or collecting lens, for collecting the Stimulated Light of the central through hole outgoing from reflecting surface 31 in the side of reflecting surface 31 wavelength conversion layer 13 dorsad.
Above in each embodiment, guiding device 12 includes a CPC14 and the 2nd CPC15.Certainly, in practice, this guiding device 12 can also be the lamp guide comprising incidence surface and exiting surface.The incidence surface of this lamp guide and exiting surface can be arranged respectively to different shapes according to actual needs, such as rectangle, square, hexagon shape, circle or other, this is not restricted.The incidence surface of this lamp guide and the shape of exiting surface can be the same or different, and the size of this incidence surface and exiting surface can be the same or different.This lamp guide can be hollow, also can be solid.
The above, above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a light-emitting device, is characterized in that, comprising:
Comprise the light-emitting device array of at least one light-emitting component, for generation of exciting light;
Described incidence surface covers described light-emitting device array, and the difference of the area of the area of described incidence surface and described light-emitting device array is no more than 1/4th of the area of described incidence surface;
Described exiting surface is coated with wavelength conversion layer, for absorbing described exciting light and producing Stimulated Light.
2. light-emitting device according to claim 1, is characterized in that,
Described guiding device comprises the first compound parabolic collector (CPC) and the 2nd CPC, and a described CPC comprises the first relative end face and the second end face respectively with the 2nd CPC, and wherein said first end face is less than described second end face;
First end face of a described CPC is the incidence surface of described guiding device, first end face of described 2nd CPC is the exiting surface of described guiding device, second end face of a described CPC and second end face of described 2nd CPC connect or adjacent, make incide in second end face of described 2nd CPC from the light beam of the second end face outgoing of a described CPC.
3. light-emitting device according to claim 2, it is characterized in that, the incident angle of a described CPC differs with the lighting angle of described light-emitting component and is no more than 10 degree, the incident angle of a wherein said CPC be after first surface feeding sputtering of a described CPC at most through primary event namely from the maximum incident angle degree of the incident ray of the second end face outgoing of a described CPC.
4. light-emitting device according to claim 2, it is characterized in that, to differ with the incident angle of described 2nd CPC from the maximum shooting angle of the light beam of the second end face outgoing of a described CPC and be no more than 10 degree, the incident angle of wherein said 2nd CPC be after second surface feeding sputtering of described 2nd CPC at most through primary event namely from the maximum incident angle degree of the incident ray of the first end face outgoing of described 2nd CPC.
5. light-emitting device according to claim 2, is characterized in that, is greater than 80 degree from the maximum shooting angle of the light of the first end face outgoing of described 2nd CPC.
6. light-emitting device according to claim 2, is characterized in that,
Second end face of described 2nd CPC is greater than or equal to second end face of a described CPC.
7. light-emitting device according to claim 2, is characterized in that, a described CPC and the 2nd CPC is solid, and a described CPC and the 2nd CPC is one-body molded.
8. light-emitting device according to claim 7, is characterized in that, described light-emitting device array is immersed in the entrance port of a described CPC;
And/or,
Described wavelength conversion layer is immersed in the entrance port of described 2nd CPC.
9. light-emitting device according to claim 2, is characterized in that, be provided with optical filter between a described CPC and described 2nd CPC, reflects described Stimulated Light for exciting light described in transmission;
And/or,
Also be provided with optical filter between described wavelength conversion layer and described 2nd CPC, reflect described Stimulated Light for exciting light described in transmission.
10. light-emitting device according to claim 9, it is characterized in that, the side of described wavelength conversion layer described 2nd CPC dorsad is also provided with ringwise reflecting surface, described reflecting surface is a part for sphere, described wavelength conversion layer is positioned at the centre of sphere place of described sphere, and the central shaft of described reflecting surface crosses described wavelength conversion layer.
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| CN201410433093.7A CN105465656A (en) | 2014-08-29 | 2014-08-29 | Light emitting device |
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| CN201410433093.7A CN105465656A (en) | 2014-08-29 | 2014-08-29 | Light emitting device |
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| CN105465656A true CN105465656A (en) | 2016-04-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109196663A (en) * | 2016-05-26 | 2019-01-11 | 夏普株式会社 | Optical sensor |
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Application publication date: 20160406 |