CN102097574A

CN102097574A - Led

Info

Publication number: CN102097574A
Application number: CN 201010585908
Authority: CN
Inventors: 伍永安; 郝俊虎; 乔燕飞; 赵晋红; 许航; 卫媛洁
Original assignee: SHANXI LEBAI LITE TECHNOLOGY Co Ltd
Current assignee: SHANXI LEBAI LITE TECHNOLOGY Co Ltd
Priority date: 2010-12-14
Filing date: 2010-12-14
Publication date: 2011-06-15

Abstract

The invention provides an LED (Light Emitting Diode), comprising: a semiconductor light emitting chip, a base made of a heat conduction material and used for bearing the semiconductor light emitting chip, a positive electrode and a negative electrode for leading in current, and at least two fluorescent substances. Compared with the prior art, the LED of the invention has wider light emitting color range, better color purity and excellent color range coverage and color reducibility, further strengthens the color expressiveness of bright red and dark green to achieve brighter as well as more gorgeous and eye-dazzling red and green, and accordingly, exhibits more vivid color than the traditional LEDs.

Description

A kind of LED

Technical field

The present invention relates to a kind of LCD backlight source, and particularly a kind of light-emitting diode (Light Emitting Diode, LED).

Background technology

At present, the market demand of liquid crystal indicator is the strong growth impetus, and along with the increase of liquid crystal indicator size, LCD backlight source influence to image quality in device is also more and more higher.And the LED-backlit source technology is as one of the main flow trend of high image quality technical development in the liquid crystal indicator, because its high color saturation and enough wide colour gamut, remedied the defective of liquid crystal display display color lazy weight; In addition, because the LED-backlit source does not contain Toxic matter mercury, environmental protection, and good mechanical shock stability, advantages such as luminescent lifetime length, thus win increasing concern.

Wherein, splendid colour gamut shows it is one of the most noticeable advantage of LED-backlit source, usually LED-backlit source images shows signal adopts the different color of mixed proportion definition of Red Green Blue, human eye is then distinguished the ratio of red, green, blue three looks by brightness, tone and the saturation of aware colors, and the relation of tone and saturation and red, green, blue is non-linear.Shown in Figure 1, be existing traditional LED-backlit source spectrogram, adopt yellow fluorescent powder to be added on the blue-ray LED, its excitation spectrum has two crests, and one at blue wave band, another is from the green glow to the red spectral band, be a kind of mixing peak, use color filter to the color filtering that this wave band is fit to each look lattice needs, it can waste most optical energy, consequence is to make the chromatogram of passing after the filtration unsatisfactory, so Color Management Technology is comparatively difficult.Simultaneously, adopt this kind LED-backlit source technology,, cause the not enough natural reality of image frame of demonstration owing to can't show more chromatic colour of BELAND, green, red three primary colors.

Therefore, need a kind of new LED backlight, it does not need color filter, can access bright-coloured indigo plant, green, red three primary colors, to strengthen scarlet and dark green color representation, makes redness and green become vivid more gorgeous brilliant.

Summary of the invention

The invention provides a kind of LED-backlit source, excite at least two kinds of fluorescent materials and luminous by chip, the spectrum that is produced comprises green fluorescence peak and red fluorescence peak at least, and can obtain different illumination effects by the intensity of regulating two fluorescence peaks.

Wherein, described at least two kinds of fluorescent materials can comprise the mixture of two kinds and two or more fluorescent material, or two-layer or two-layer above phosphor layer.

The present invention also provides a kind of LED, it is characterized in that described LED comprises: the semiconductor light emitting chip; Base is made by Heat Conduction Material, is used to carry described semiconductor light emitting chip; Positive pole and negative pole are used to import electric current; And at least two kinds of fluorescent materials.

Compare with existing LED-backlit source spectrum, because after adopting blue-light LED chip to add red, green fluorescence powder respectively, layering excites different-waveband spectrum, compare with existing LED-backlit source, do not need color filter, can access bright-coloured indigo plant, green, red three primary colors, strengthen scarlet and dark green color representation, cause redness and green to become vivid more gorgeous brilliant.

Description of drawings

For the features and advantages of the present invention are become apparent, describe in detail below in conjunction with accompanying drawing, wherein

Fig. 1 is the spectrogram in present LED-backlit source;

Fig. 2 is the spectrogram in LED-backlit source according to an embodiment of the invention;

Fig. 3 is the spectrogram of positive according to an embodiment of the invention white LEDs backlight.

Fig. 4 is the structural representation of LED according to an embodiment of the invention.

Embodiment

Below by drawings and Examples, technical scheme of the present invention is done detailed description.

As shown in Figure 4, LED provided by the invention comprises: semiconductor light emitting chip 1; Base 2 is made by Heat Conduction Material, is used to carry described semiconductor light emitting chip; Positive pole 4 and negative pole 5 are used to import electric current; And at least two kinds of fluorescent materials 3.

In the preparation in LED-backlit source, at first, the blue chip of different-waveband is placed on the heat radiation ceramic base, on chip, be coated with redness and green phosphor layer then respectively, can excite by red, green, blue three former groups of primaries behind the connection electrode and close the white light of the different-colour section that forms with different proportionings.Because different phosphor powder layers are to the influence of the every index of spectrum, when being coated with fluorescent material proportioning was suitable, the layering by blue chip excited, and encapsulation back LED-backlit source institute luminous spectrum has wherein comprised blue, green and red three fluorescence peaks as shown in Figure 2.Because the interpolation of red fluorescent material, cause the red fluorescence peak to manifest, broken the mixing wave band of traditional LED-backlit source spectrum from the green to the redness, green and red fluorescence peak are manifested respectively, strengthened scarlet and dark green performance, thereby made the LED-backlit source show color more true to nature.

Wherein, be example with positive white LEDs backlight, adopt the chip of the brilliant first EDI-1270 of 455nm～457.5nm, the fluorescent material that is coated with is made up of the green phosphor layer of Ying Temei R6733 red fluorescence bisque and G2762.Behind the some ground floor fluorescent glue, make spectrum red ratio index account for 40～50%; Behind the some second layer fluorescent glue, make green fluorescence peak and blue-fluorescence peak contour.Finished product led light source spectrum is done as shown in Figure 3 by institute, and blue, green and red trichromatic spectrum is separated from each other, and spectrum proportion difference of all kinds.

The above is one of execution mode, studies show that, adopt the chip of different-waveband size model, proportioning and component by the appropriate regulation phosphor powder layer, can regulate blueness, redness and green fluorescence peak ratio respectively, and then obtain desirable light source effect, there is very big difference as Fig. 2 and redness and green spectral proportion shown in Figure 3.Make the LED-backlit source show that simultaneously Red is not limited to said chip and fluorescent material, and relevant proportioning data.

The LED-backlit source of method for preparing excites at least two kinds of fluorescent materials and luminous by chip, and the spectrum that is produced comprises green fluorescence peak and red fluorescence peak at least, and can obtain different illumination effects by the intensity of regulating two fluorescence peaks.

Wherein, described at least two kinds of fluorescent materials can comprise the mixture of two kinds and two or more fluorescent material, or two-layer or two-layer above phosphor layer.By the adjusting to fluorescent material, in two fluorescence peaks of green that requirement is sent and redness, the scope at red fluorescence peak to 690nm, wherein arrives the red fluorescence peak best results of 660nm at 580nm especially with 600nm; The scope at green fluorescence peak to 580nm, wherein arrives the green fluorescence peak best results of 560nm at 490nm especially with 510nm.And two peak ratio can be in 1 to 20 to 20 to 1 scope, and with 1 to 2 to 2 to 1 spectrum peak ratio best results.

It should be noted last that; above embodiment is only unrestricted in order to technical scheme of the present invention to be described; although the present invention is had been described in detail with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement technical scheme of the present invention; and do not break away from the spirit and scope of technical solution of the present invention, therefore, protection scope of the present invention is as the criterion when defining with claims.

Claims

1. LED is characterized in that described LED comprises:

The semiconductor light emitting chip;

Base is made by Heat Conduction Material, is used to carry described semiconductor light emitting chip;

Positive pole and negative pole are used to import electric current; And

At least two kinds of fluorescent materials.

2. LED as claimed in claim 1 is characterized in that described semiconductor light emitting chip is ultraviolet light chip, purple light chip, blue chip or blue green light chip.

3. LED as claimed in claim 2 is characterized in that described at least two kinds of fluorescent materials comprise the fluorescent orange material.

4. LED as claimed in claim 1 is characterized in that described at least two kinds of fluorescent materials are the mixtures that comprise two kinds of fluorescent material.

5. LED as claimed in claim 4 is characterized in that described at least two kinds of fluorescent materials are the mixture of red fluorescent material and green fluorescence material or the mixture of red fluorescent material and yellow fluorescent substance.

6. LED as claimed in claim 1 is characterized in that described at least two kinds of fluorescent materials comprise two-layer or two-layer above phosphor layer.

7. LED as claimed in claim 6 is characterized in that described at least two kinds of fluorescent materials comprise green fluorescence material layer and red fluorescent material layer, or yellow fluorescent substance layer and red fluorescent material layer.

8. LED as claimed in claim 1 is characterized in that described base is a ceramic base.

9. LED as claimed in claim 1, it is characterized in that described semiconductor light emitting chip is that the scope at blue chip and blue-fluorescence peak is 450nm～470nm, perhaps described semiconductor light emitting chip is that the scope at purple light chip and purple fluorescence peak is 300nm～400nm.

10. as each described LED among the claim 1-9, be used for display backlight or projector light source.